/* =====================================================================
 * QYSEA E-GO Developer Center — ego-developer.css
 * v2.1 · 整理压缩版（大括号单行）
 * ===================================================================== */

/* ---------- 1. Design tokens ---------- */
:root{
  --bg-page:#F6FAFD; --bg-section-alt:#EDF5FB; --bg-card:#FFFFFF;
  --bg-deep:#07182B; --bg-deep-2:#0C2740; --bg-code:#0A1A2E;
  --bg-hero-grad-a:#EAF4FB; --bg-hero-grad-b:#F8FCFE;
  --text-title:#0B2239; --text-body:#33475B; --text-muted:#5B7186;
  --text-on-deep:#D8ECF9; --text-on-deep-muted:#8FB3CC;
  --color-primary:#005CB9; --color-primary-dark:#015CB9; --color-primary-ink:#FFFFFF;
  --color-accent-ai:#22C58B; --color-accent-track:rgb(6,171,243); --color-accent-diy:#E8913A;
  --color-warn:#B7791F; --bg-warn:#FDF3E1;
  --border-card:#D9E6F0; --border-strong:#B9CFDF; --border-on-deep:#1D3A55;
  --hud-ok:#8CE99A; --hud-info:#005CB9; --hud-rec:#E03131;
  --font-ui:"Inter","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",Consolas,"Courier New",monospace;
  --fs-hero:clamp(34px,4.6vw,58px); --fs-h2:clamp(26px,3.2vw,40px); --fs-h3:clamp(20px,2.2vw,26px);
  --fs-body:16px; --fs-small:13.5px; --lh-title:1.22; --lh-body:1.7;
  --fw-title:700; --fw-kicker:800; --ls-kicker:.18em;
  --radius-s:8px; --radius-m:14px; --radius-l:20px; --radius-pill:999px;
  --space-section:clamp(72px,10vh,120px); --space-gutter:clamp(20px,4vw,48px);
  --container-max:1240px;
  --shadow-card:0 2px 10px rgba(11,34,57,.06);
  --shadow-card-hover:0 10px 30px rgba(11,34,57,.12);
  --shadow-deep:0 18px 60px rgba(7,24,43,.35);
  --texture-caustics:repeating-linear-gradient(115deg,transparent 0 60px,rgba(0,169,206,.05) 60px 120px);
  --texture-grid:linear-gradient(var(--border-card) 1px,transparent 1px),linear-gradient(90deg,var(--border-card) 1px,transparent 1px);
  --ease-out:cubic-bezier(.22,.9,.3,1); --ease-spring:cubic-bezier(.3,1.25,.4,1);
  --dur-fast:.3s; --dur-med:.6s; --dur-slow:1s;
  --nav-offset:55px;
}

/* ---------- 2. Reset + base ---------- */
*{margin:0;padding:0;box-sizing:border-box;font-family:var(--font-ui)!important}
html{scroll-behavior:smooth}
body{font-size:var(--fs-body);line-height:var(--lh-body);background:var(--bg-page);color:var(--text-body);overflow-x:hidden;-webkit-font-smoothing:antialiased}
html[lang^="zh"] body{line-height:1.8}
img,svg,video{max-width:100%;display:block}
a{color:var(--color-primary-dark);text-decoration:none}
a:hover{color:var(--color-primary)}
button{font-family:inherit;cursor:pointer}
section[id],div[id].container{scroll-margin-top:calc(var(--nav-offset) + 20px)}
:focus-visible{outline:3px solid var(--color-primary);outline-offset:2px;border-radius:4px}

/* Layout helpers */
.container{max-width:var(--container-max);margin:0 auto;padding:0 var(--space-gutter)}
.section{padding:var(--space-section) 0}
.section-alt{background:var(--bg-section-alt)}
h1,h2,h3{color:var(--text-title);line-height:var(--lh-title);font-weight:var(--fw-title)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
.mono{font-family:var(--font-mono)}
.term pre *{font-family:var(--font-mono)}
.marginb20{margin-bottom:12px}
.section-head{max-width:820px;margin-bottom:44px}
.section-head.center{margin-inline:auto;text-align:center}
.section-head p{margin-top:14px}

/* Kicker pill */
.kicker{display:inline-block;font-size:var(--fs-small);font-weight:var(--fw-kicker);letter-spacing:var(--ls-kicker);text-transform:uppercase;color:var(--color-primary-dark);border:1.5px solid var(--color-primary);border-radius:var(--radius-pill);padding:6px 18px;margin-bottom:16px;background:rgba(0,169,206,.06)}
.on-deep .kicker{background:var(--color-primary);color:#04263A;border-color:var(--color-primary)}
.later-primary{background:var(--hud-info);color:var(--bg-card);box-shadow:0 6px 18px rgba(0,169,206,.28);padding:6px;border-radius:12px;font-size:12px;font-weight:600}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--radius-pill);padding:13px 30px;font-size:15.5px;font-weight:700;border:1.5px solid transparent;transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast),background var(--dur-fast)}
.btn-primary{background:var(--color-primary);color:var(--color-primary-ink);box-shadow:0 6px 18px rgba(0,169,206,.28)}
.btn-primary:hover{background:var(--color-primary-dark);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--color-primary-dark);border-color:var(--border-strong)}
.btn-ghost:hover{border-color:var(--color-primary);color:var(--color-primary);transform:translateY(-2px)}

/* ---------- 3. S0 — Sticky navigation ---------- */
.site-nav{position:fixed;inset:0 0 auto 0;z-index:100;background:#fff;border-bottom:1px solid var(--border-card);transition:box-shadow var(--dur-fast)}
.site-nav.scrolled{box-shadow:0 8px 24px rgba(11,34,57,.08)}
.nav-inner{max-width:var(--container-max);margin:0 auto;height:57px;padding:0 var(--space-gutter);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px}
.brand{justify-self:start;display:inline-flex;align-items:baseline;color:var(--text-title);font-size:15px;font-weight:900;letter-spacing:.045em;text-transform:uppercase;white-space:nowrap;min-width:0}
.brand .brand-main{color:var(--text-title)}
.brand .brand-sub{color:var(--color-primary);margin-left:7px}
#primaryNav{justify-self:center;min-width:0}
.nav-links{display:flex;align-items:center;gap:1px;list-style:none}
.nav-links a{display:block;padding:8px 10px;border-radius:6px;color:var(--text-muted);font-size:13px;font-weight:650;white-space:nowrap}
.nav-links a:hover{color:var(--color-primary-dark);background:rgba(0,169,206,.06)}
.nav-links a.active{color:var(--color-primary-dark);background:rgba(0,169,206,.1)}
.nav-actions{justify-self:end;display:flex;align-items:center;gap:10px;min-width:0}
.nav-cta-link{display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;border:1.5px solid var(--color-primary);border-radius:var(--radius-pill);background:#fff;color:var(--color-primary-dark);padding:7px 16px;font-size:13px;font-weight:750;transition:background var(--dur-fast),color var(--dur-fast),transform var(--dur-fast)}
.nav-cta-link:hover{background:var(--color-primary);color:#fff;transform:translateY(-1px)}
.lang-switch{display:inline-flex;border:1px solid var(--border-strong);border-radius:var(--radius-pill);overflow:hidden;flex:0 0 auto;background:#fff}
.lang-switch button{border:0;background:transparent;padding:5px 11px;font-size:12px;font-weight:750;color:var(--text-muted)}
.lang-switch button[aria-pressed="true"]{background:var(--color-primary);color:#fff}
.burger{display:none;justify-self:end;background:none;border:1.5px solid var(--border-strong);border-radius:var(--radius-s);width:44px;height:40px;flex:0 0 44px;position:relative}
.burger span{position:absolute;left:11px;right:11px;height:2px;background:var(--text-title);transition:transform var(--dur-fast),opacity var(--dur-fast)}
.burger span:nth-child(1){top:13px}
.burger span:nth-child(2){top:19px}
.burger span:nth-child(3){top:25px}
body.drawer-open .burger span:nth-child(1){transform:translateY(6px) rotate(45deg)}
body.drawer-open .burger span:nth-child(2){opacity:0}
body.drawer-open .burger span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-drawer{display:none}
@media(max-width:900px){
  .nav-inner{grid-template-columns:auto 1fr auto}
  #primaryNav,.nav-actions{display:none}
  .burger{display:block;grid-column:3}
  .nav-drawer{display:block;position:fixed;top:var(--nav-offset);left:0;right:0;bottom:0;z-index:99;background:var(--bg-card);padding:24px var(--space-gutter) 40px;overflow-y:auto;transform:translateX(105%);transition:transform var(--dur-fast) var(--ease-out)}
  body.drawer-open .nav-drawer{transform:none;box-shadow:-8px 0 40px rgba(11,34,57,.12)}
  .nav-drawer ul{list-style:none;display:flex;flex-direction:column;gap:6px}
  .nav-drawer a{display:block;padding:13px 6px;font-size:17px;font-weight:600;color:var(--text-title);border-bottom:1px solid var(--border-card)}
  .nav-drawer a.active{color:var(--color-primary-dark)}
  .nav-drawer .nav-cta{margin-top:20px;text-align:center;background:var(--color-primary);color:#fff;border-radius:var(--radius-pill);padding:15px}
  .nav-drawer .drawer-lang{margin-top:22px;display:flex;justify-content:center}
}
@media(max-width:767px){:root{--nav-offset:78px} .nav-inner{height:55px}}

/* ---------- 4. S1 — Hero ---------- */
.hero{min-height:100vh;min-height:100svh;display:flex;flex-direction:column;justify-content:center;position:relative;overflow:hidden;padding:calc(var(--nav-offset) + 42px) 0 200px;background:#07182B}
.hero-bg{position:absolute;inset:0;z-index:0;overflow:hidden;background:#07182B}
.hero-bg video{width:100%;height:100%;object-fit:cover;display:block;object-position: 10% center}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(4,12,22,.90) 0%,rgba(4,12,22,.62) 40%,rgba(4,12,22,.20) 68%,rgba(4,12,22,0) 100%),linear-gradient(180deg,rgba(4,12,22,.55) 0%,rgba(4,12,22,0) 30%,rgba(4,12,22,.10) 62%,rgba(4,12,22,.66) 100%)}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,720px);align-items:center;width:100%}
.hero .kicker{border:0;background:transparent;padding:0;margin:0 0 16px;font-size:11.5px;letter-spacing:.22em;color:#2287ee}
.hero h1{max-width:680px;font-size:clamp(40px,5.4vw,68px);line-height:1.05;margin:0 0 20px;letter-spacing:-.04em;color:#F4FBFF}
html[lang^="zh"] .hero h1{line-height:1.14;letter-spacing:-.02em}
.hero .lead{max-width:570px;font-size:16.5px;color:rgba(214,236,248,.88)}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.hero .btn{padding:10px 20px;font-size:14px;border-radius:6px;box-shadow:none}
.hero .btn-primary{box-shadow:0 8px 20px rgba(0,169,206,.2)}
.hero .btn-ghost{background:rgba(10,30,48,.42);backdrop-filter:blur(6px);color:#DFF2FC;border-color:rgba(150,210,238,.55)}
.hero .btn-ghost:hover{border-color:#5FD8F2;color:#8FE4F8}
.hero [data-hero]{opacity:0;transform:translateY(22px);animation:heroIn var(--dur-med) var(--ease-out) forwards}
@keyframes heroIn{to{opacity:1;transform:none}}
.hero-eco{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:22px;margin-top:42px;padding-top:17px;border-top:1px solid rgba(140,200,232,.28)}
.hero-support{font-size:12.5px;line-height:1.55;color:rgba(190,220,238,.78);max-width:360px}
.eco-pills{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.eco-pill{display:inline-flex;align-items:center;min-height:28px;border:1px solid rgba(140,200,232,.38);border-radius:6px;background:rgba(10,30,48,.48);backdrop-filter:blur(6px);padding:5px 11px;color:#CFEAF7;font-size:11.5px;font-weight:700;white-space:nowrap}
.scroll-hint{position:absolute;z-index:1;bottom:8px;left:50%;transform:translateX(-50%);color:rgba(190,220,238,.85);opacity:.72;font-size:11px;letter-spacing:.2em;font-weight:700;display:flex;flex-direction:column;align-items:center;gap:2px;animation:bob 1.8s infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,7px)}}
@media(max-width:860px){
  .hero{padding-top:calc(var(--nav-offset) + 34px)}
  .hero-bg::after{background:linear-gradient(180deg,rgba(4,12,22,.86) 0%,rgba(4,12,22,.58) 44%,rgba(4,12,22,.34) 72%,rgba(4,12,22,.60) 100%)}
  .hero-eco{align-items:flex-start;flex-direction:column}
  .eco-pills{justify-content:flex-start}
}
@media(max-width:560px){.hero h1{font-size:clamp(34px,11vw,44px)} .hero{padding-bottom:54px} .scroll-hint{display:none}}

/* Shared media placeholder */
.ph{position:relative;border-radius:var(--radius-l);overflow:hidden;background:linear-gradient(150deg,var(--bg-section-alt),var(--bg-hero-grad-a));border:1px solid var(--border-card);box-shadow:var(--shadow-card)}
.ph .ph-tag{position:absolute;left:12px;bottom:10px;font-family:var(--font-mono);font-size:11.5px;color:var(--text-muted);background:rgba(255,255,255,.82);border:1px solid var(--border-card);border-radius:6px;padding:2px 8px}
.ph.deep{background:linear-gradient(160deg,var(--bg-deep-2),var(--bg-deep));border-color:var(--border-on-deep)}
.ph.deep .ph-tag{background:rgba(7,24,43,.8);color:var(--text-on-deep-muted);border-color:var(--border-on-deep)}

/* ---------- 5. S2 — Scene 1: code terminal + camera HUD ---------- */
.demo{display:grid;grid-template-columns:1.02fr 1fr;gap:24px;align-items:stretch}
@media(max-width:920px){.demo{grid-template-columns:1fr;align-items:start}}

/* Code terminal */
.term{position:relative;background:var(--bg-code);border:1px solid var(--border-on-deep);border-radius:var(--radius-m);overflow:hidden;box-shadow:var(--shadow-deep);min-height:0}
.term-inner{position:absolute;inset:0;display:flex;flex-direction:column}
.term .bar{flex:0 0 auto;background:#12243A;padding:10px 14px;display:flex;gap:7px;align-items:center;flex-wrap:wrap}
.term .bar i{width:11px;height:11px;border-radius:50%}
.term .bar .fname{margin-left:8px;font-size:12px;color:#7FA6C4;font-family:var(--font-mono)}
.term pre{flex:1 1 auto;min-height:0;padding:18px 16px 22px;font-family:var(--font-mono);font-size:13.5px;line-height:1.85;color:#C8E2F5;white-space:pre-wrap;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;margin:0;scrollbar-width:thin;scrollbar-color:rgba(55,192,255,.45) rgba(255,255,255,.05)}
.term pre::-webkit-scrollbar{width:8px;height:8px}
.term pre::-webkit-scrollbar-track{background:rgba(255,255,255,.05);border-radius:4px}
.term pre::-webkit-scrollbar-thumb{background:rgba(55,192,255,.38);border-radius:4px;border:2px solid transparent;background-clip:padding-box}
.term pre::-webkit-scrollbar-thumb:hover{background:rgba(55,192,255,.7);background-clip:padding-box}
@media(max-width:920px){.term-inner{position:static} .term pre{max-height:52vh;overflow-y:auto}}
.cline{display:block;opacity:.07;transition:opacity var(--dur-fast);border-left:2px solid transparent;padding-left:10px;margin-left:-12px}
.cline.on{opacity:1}
.cline.run{border-left-color:var(--hud-info);background:rgba(55,192,255,.09)}
.cm{color:#587794}
.fn{color:#FFD166}
.st{color:#8CE99A}
.kw{color:#6AB7FF}

/* FPV camera panel + HUD */
.feed{position:relative;border-radius:var(--radius-m);overflow:hidden;border:1px solid #24506F;box-shadow:var(--shadow-deep);background:#020B14;aspect-ratio:16/10;min-height:0;transition:border-color var(--dur-fast),box-shadow var(--dur-fast)}
.fpv-clip{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .7s ease,filter 1.1s;filter:saturate(.92) brightness(.78)}
.feed.video-on .fpv-clip.active{opacity:1}
.feed.led-on .fpv-clip.active{filter:saturate(1.16) brightness(1.34)}
.feed::before{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.42;background:linear-gradient(rgba(80,190,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(80,190,255,.05) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse 76% 72% at 50% 50%,#000,transparent 80%)}
.feed::after{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;background:radial-gradient(ellipse 74% 70% at 50% 48%,transparent 52%,rgba(0,8,18,.58) 100%)}
.feed .ledglow{position:absolute;inset:0;z-index:2;background:radial-gradient(ellipse 58% 62% at 50% 56%,rgba(255,242,170,.46),transparent 72%);opacity:0;transition:opacity 1.2s;pointer-events:none}
.feed.led-on .ledglow{opacity:1}

/* APP topbar */
.app-topbar{position:absolute;left:0;right:0;top:0;z-index:6;height:48px;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 14px;background:linear-gradient(180deg,rgba(2,11,20,.88),rgba(2,11,20,.28) 78%,transparent);color:#D8ECF9}
.app-id{display:flex;align-items:center;gap:9px;font-size:11.5px;font-weight:850;letter-spacing:.13em;text-transform:uppercase;color:#8FD4EE;white-space:nowrap}
.app-id i{width:9px;height:9px;border-radius:50%;background:#50697D;box-shadow:0 0 0 4px rgba(80,105,125,.16);transition:all var(--dur-fast)}
.feed.connected .app-id i{background:var(--hud-ok);box-shadow:0 0 14px rgba(140,233,154,.75)}
.app-status{font-family:var(--font-mono);font-size:11.5px;color:#7FA6C4;white-space:nowrap}
.feed.connected .app-status{color:var(--hud-ok)}
.app-rec{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;color:#CFE8FA;white-space:nowrap;opacity:.38;transition:opacity var(--dur-fast)}
.app-rec i{width:9px;height:9px;border-radius:50%;background:var(--hud-rec);animation:blink 1s infinite}
.feed.video-on .app-rec{opacity:1}
@keyframes blink{50%{opacity:.15}}
.app-rec .ts{font-family:var(--font-mono);color:#D8ECF9}

/* FPV reticle */
.fpv-reticle{position:absolute;left:50%;top:50%;z-index:3;width:112px;height:112px;transform:translate(-50%,-50%);opacity:0;transition:opacity .7s;pointer-events:none}
.feed.video-on .fpv-reticle{opacity:.58}
.fpv-reticle::before,.fpv-reticle::after{content:"";position:absolute;background:rgba(143,212,238,.72)}
.fpv-reticle::before{left:50%;top:0;width:1px;height:100%;transform:translateX(-.5px)}
.fpv-reticle::after{top:50%;left:0;height:1px;width:100%;transform:translateY(-.5px)}
.fpv-reticle span{position:absolute;inset:22px;border:1px solid rgba(143,212,238,.55);border-radius:50%}

/* HUD cards */
.hud-item{position:absolute;z-index:5;background:rgba(4,19,34,.84);border:1px solid rgba(90,190,255,.55);border-radius:10px;padding:8px 12px;font-size:12.5px;opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease-spring),transform .5s var(--ease-spring);color:var(--text-on-deep);backdrop-filter:blur(6px)}
.hud-item.show{opacity:1;transform:none}
.hud-item b{color:var(--hud-info);display:block;font-size:10.5px;margin-bottom:2px;letter-spacing:.1em;text-transform:uppercase}
.hud-item .val{font-family:var(--font-mono);color:var(--hud-ok);font-size:13px}
#hud-conn{top:60px;left:14px;border-color:rgba(140,233,154,.6)}
#hud-motion{top:60px;right:14px}
#hud-light{bottom:102px;right:14px}

/* Telemetry */
.tele{position:absolute;left:16px;right:16px;bottom:63px;z-index:4;display:flex;justify-content:space-between;gap:8px;opacity:0;transition:opacity .8s;pointer-events:none;font-family:var(--font-mono)}
.feed.video-on .tele,.tele.show{opacity:1}
.tele span{white-space:nowrap;font-size:11px;color:rgba(216,236,248,.92);text-shadow:0 1px 6px rgba(0,10,20,.85)}
.tele span em{font-style:normal;color:rgba(143,180,205,.72);margin-right:4px;font-size:9.5px;letter-spacing:.08em;text-transform:uppercase}
.tele span b{font-weight:600;transition:color .5s}
.tele.live span b{color:var(--hud-ok)}

/* Bottom control dock */
.control-dock{position:absolute;left:0;right:0;bottom:0;z-index:5;height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:linear-gradient(0deg,rgba(2,11,20,.9),rgba(2,11,20,.36) 82%,transparent);opacity:0;transition:opacity .6s}
.feed.video-on .control-dock{opacity:1}
.joystick{width:42px;height:42px;border:1px solid rgba(143,212,238,.46);border-radius:50%;position:relative;background:rgba(6,26,44,.55)}
.joystick::after{content:"";position:absolute;left:50%;top:50%;width:18px;height:18px;border-radius:50%;transform:translate(-50%,-50%);background:rgba(143,212,238,.72);box-shadow:0 0 16px rgba(55,192,255,.35)}
.dock-actions{display:flex;gap:8px}
.dock-actions span{border:1px solid rgba(143,212,238,.42);border-radius:7px;background:rgba(6,26,44,.6);color:#8FD4EE;padding:5px 9px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em}

/* AI scan + overlays + mode chip */
.feed .scanline{position:absolute;left:0;right:0;top:0;height:3px;z-index:4;background:linear-gradient(90deg,transparent,#37FF9A,transparent);box-shadow:0 0 24px #37FF9A;opacity:0}
.feed.ai-scan .scanline{opacity:1;animation:scan 1.6s ease-in-out 2}
@keyframes scan{0%{top:0}50%{top:calc(100% - 3px)}100%{top:0}}
.ai-overlay{position:absolute;inset:0;z-index:4;opacity:0;transition:opacity .7s;pointer-events:none}
.ai-overlay.on{opacity:1}
.ai-box{position:absolute;border:2px solid var(--color-accent-ai);border-radius:6px;font-family:var(--font-mono);font-size:10.5px;color:#03240F;box-shadow:0 0 14px rgba(55,255,154,.28),inset 0 0 10px rgba(55,255,154,.12)}
.ai-box i{position:absolute;top:-18px;left:-2px;background:var(--color-accent-ai);border-radius:4px;padding:1px 7px;font-style:normal;font-weight:700;white-space:nowrap}
.ai-overlay.on .ai-box{animation:boxIn .45s var(--ease-out) both,aiDrift 5.4s ease-in-out .7s infinite alternate}
.ai-overlay.on .ai-box:nth-child(2){animation-delay:.18s,.9s}
.ai-overlay.on .ai-box:nth-child(3){animation-delay:.36s,1.2s}
@keyframes boxIn{from{opacity:0;scale:1.3}to{opacity:1;scale:1}}
@keyframes aiDrift{from{translate:0 0}to{translate:14px -9px}}
.mode-chip{position:absolute;left:50%;top:126px;transform:translateX(-50%) translateY(-10px);z-index:6;background:rgba(55,255,154,.94);color:#03240F;font-size:12px;font-weight:850;letter-spacing:.12em;border-radius:8px;padding:6px 14px;opacity:0;transition:all .5s;text-transform:uppercase;white-space:nowrap}
.mode-chip.track{background:rgba(0,180,255,.95)}
.mode-chip.show{opacity:1;transform:translateX(-50%)}
.feed.mode-detect{border-color:rgba(55,255,154,.75);box-shadow:0 0 40px rgba(55,255,154,.22)}
.feed.mode-track{border-color:rgba(0,180,255,.75);box-shadow:0 0 40px rgba(0,180,255,.22)}

/* Caption + replay */
.demo-note{margin-top:20px;text-align:center;min-height:26px;font-size:15px;color:var(--text-muted)}
.demo-note .cap-card{display:inline-block;background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-m);box-shadow:var(--shadow-card);padding:12px 26px;max-width:760px}
.replay-wrap{text-align:center;margin-top:14px;min-height:50px}

/* S2 responsive */
@media(max-width:920px){.feed{min-height:360px} .tele{bottom:70px;flex-wrap:wrap;row-gap:2px}}
@media(max-width:767px){
  .hud-item{font-size:10px;padding:4px 7px;border-radius:7px;max-width:42vw;word-break:break-word;line-height:1.35}
  .hud-item b{font-size:8.5px;letter-spacing:.08em;margin-bottom:1px}
  .hud-item .val{font-size:10.5px}
  #hud-conn{top:44px;left:8px}
  #hud-motion{top:44px;right:8px;text-align:right}
  #hud-light{bottom:102px;left:8px}
  .app-topbar{height:36px;padding:0 8px}
  .app-id{font-size:9.5px;letter-spacing:.1em;gap:5px}
  .app-id i{width:6px;height:6px}
  .app-status{font-size:9.5px}
  .app-rec{font-size:9.5px;gap:4px}
  .app-rec i{width:6px;height:6px}
  .tele{bottom:48px;left:8px;right:8px;gap:4px}
  .tele span{font-size:8.5px;text-shadow:0 1px 4px rgba(0,10,20,.95)}
  .tele span em{font-size:7.5px;margin-right:2px}
  .tele span b{font-size:9.5px}
  .control-dock{height:42px;padding:0 8px}
  .joystick{width:32px;height:32px}
  .joystick::after{width:13px;height:13px}
  .dock-actions{gap:5px}
  .dock-actions span{font-size:9px;padding:3px 6px;border-radius:5px}
  .demo .feed{margin-left:calc(-1 * var(--space-gutter));margin-right:calc(-1 * var(--space-gutter));width:calc(100% + 2 * var(--space-gutter));border-radius:0;border-left:0;border-right:0}
  .feed .app-topbar{padding:0 12px}
  .hud-item{padding:6px 10px}
  #hud-conn,#hud-light{left:10px}
  #hud-motion{right:10px}
  .tele{left:12px;right:12px}
}
@media(max-width:520px){.feed{min-height:330px} .hud-item{font-size:11px;padding:7px 9px} .tele span{font-size:10px} .tele span em{font-size:8.5px} .dock-actions span:nth-child(2){display:none}}
@media(max-width:380px){#hud-light{bottom:96px} .hud-item{max-width:44vw} .tele span{font-size:8px} .tele span b{font-size:9px}}

/* ---------- 6. Scroll theaters — shared ---------- */
@keyframes caustic{to{transform:translateX(-170px)}}
.stage-sec{position:relative}
body.theater-on .stage-sec{height:320vh}
.stage{display:flex;flex-direction:column;justify-content:center}
body.theater-on .stage{position:sticky;top:0;height:100vh;overflow:hidden;padding-top:var(--nav-offset);padding-bottom:24px;box-sizing:border-box}
body.theater-off .stage-sec{height:auto}
body.theater-off .stage{padding:var(--space-section) 0}
.theater{position:relative;height:min(56vh,520px);border-radius:var(--radius-l);background:radial-gradient(ellipse at 50% 40%,#0C2A44 0%,#061524 72%);border:1px solid var(--border-on-deep);overflow:hidden;box-shadow:var(--shadow-deep)}
body.theater-off .theater{height:440px}
.m-static{display:none;position:absolute;inset:12px;z-index:2}
.m-static .ph{height:100%}
body.theater-off .m-static{display:block}
body.theater-off .m-static .ph{animation:mFade .3s var(--ease-out)}
@keyframes mFade{from{opacity:0}to{opacity:1}}
body.theater-off .t-anim,body.theater-off .explode{display:none}
@media(max-width:767px){body.theater-off .theater{height:72vw} body.theater-off .explode-theater{height:72vw}}
@media(min-width:768px) and (max-height:940px){
  body.theater-on .theater-head{margin-bottom:14px}
  body.theater-on .theater-head h2{font-size:clamp(22px,2.6vw,32px)}
  body.theater-on .theater-head p{margin-top:6px;font-size:14px}
  body.theater-on .caption{margin-top:12px;padding:10px 22px}
  body.theater-on .caption .cap-num{font-size:11px}
  body.theater-on .caption h3{font-size:17px;margin-top:4px}
  body.theater-on .caption p{margin-top:4px;font-size:13.5px;line-height:1.5}
  body.theater-on .prog{margin-top:12px}
  body.theater-on .prog button{width:10px;height:10px}
  body.theater-on #sdk-electrical .theater{height:max(54vh,460px);min-height:460px}
  body.theater-on #sdk-electrical .theater-head{margin-bottom:8px!important}
  body.theater-on #sdk-electrical .theater-head h2{font-size:clamp(20px,2.2vw,28px)!important}
  body.theater-on #sdk-electrical .theater-head p{margin-top:4px!important;font-size:13px!important}
  body.theater-on #sdk-electrical .caption{margin-top:8px!important;padding:8px 20px!important}
  body.theater-on #sdk-electrical .caption .cap-num{font-size:10px!important}
  body.theater-on #sdk-electrical .caption h3{font-size:15.5px!important;margin-top:2px!important}
  body.theater-on #sdk-electrical .caption p{font-size:12.5px!important;line-height:1.4!important;margin-top:2px!important}
  body.theater-on #sdk-electrical .prog{margin-top:8px!important}
  body.theater-on #sdk-electrical .prog button{width:9px!important;height:9px!important}
  body.theater-on #sdk-mechanical .theater-head{margin-bottom:8px!important}
  body.theater-on #sdk-mechanical .theater-head h2{font-size:clamp(20px,2.2vw,28px)!important}
  body.theater-on #sdk-mechanical .theater-head p{margin-top:4px!important;font-size:13px!important}
  body.theater-on #sdk-mechanical .caption{margin-top:10px!important;padding:9px 20px!important}
  body.theater-on #sdk-mechanical .caption .cap-num{font-size:10px!important}
  body.theater-on #sdk-mechanical .caption h3{font-size:16px!important;margin-top:3px!important}
  body.theater-on #sdk-mechanical .caption p{font-size:13px!important;margin-top:3px!important}
  body.theater-on #sdk-mechanical .prog{margin-top:10px!important}
  body.theater-on #sdk-mechanical .prog button{width:9px!important;height:9px!important}
}
.theater .water-caustics{position:absolute;inset:0;background:repeating-linear-gradient(115deg,transparent 0 60px,rgba(55,150,220,.06) 60px 120px);animation:caustic 9s linear infinite}
.theater-head{text-align:center;margin-bottom:22px}
.theater-head h2{color:var(--text-title)}
.caption{margin:22px auto 0;max-width:760px;text-align:center;background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-m);box-shadow:var(--shadow-card);padding:14px 26px}
.caption .cap-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;color:var(--color-primary-dark);font-weight:800}
.caption h3{margin-top:6px;font-size:20px}
.caption p{margin-top:6px;font-size:14.5px;color:var(--text-muted)}
.prog{display:flex;gap:10px;justify-content:center;margin-top:14px}
.prog button{width:12px;height:12px;border-radius:50%;border:1.5px solid var(--border-strong);background:transparent;padding:0;transition:all var(--dur-fast)}
.prog button.on{background:var(--color-primary);border-color:var(--color-primary);box-shadow:0 0 10px rgba(0,169,206,.55);transform:scale(1.3)}
body.theater-on .prog button{pointer-events:none}
.stepper{display:none;justify-content:center;gap:14px;margin-top:16px}
body.theater-off .stepper{display:flex}
.stepper button{width:44px;height:44px;border-radius:50%;border:1.5px solid var(--border-strong);background:var(--bg-card);color:var(--text-title);font-size:19px;font-weight:800;transition:all var(--dur-fast)}
.stepper button:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary)}
.stepper button:disabled{opacity:.35;cursor:default}

/* ---------- 7. Scene 2 — electrical assembly (S3 main screen) ---------- */
.t-media{position:absolute;filter:drop-shadow(0 16px 28px rgba(0,0,0,.55));transition:all .9s var(--ease-out);will-change:transform,opacity}
.t-media img{width:100%;height:auto;display:block;pointer-events:none;user-select:none}
.t-host{left:50%;top:44%;width:min(560px,58%);transform:translate(-50%,-50%);z-index:4;animation:floaty 5s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translate(-50%,-50%) translateY(0)}50%{transform:translate(-50%,-50%) translateY(-14px)}}
.theater.st1 .t-host,.theater.st2 .t-host{top:36%;width:min(560px,46%)}
.theater.st3 .t-host{top:40%;opacity:0;transform:translate(-50%,-50%) scale(.9)}
.t-ifc{left:50%;bottom:11%;width:min(180px,40%);z-index:5;opacity:0;transform:translate(-50%,-14%) scale(.82)}
.theater.st1 .t-ifc{opacity:1;transform:translate(-50%,0) scale(1)}
.theater.st2 .t-ifc{opacity:0;transform:translate(-50%,-10%) scale(.88)}
.t-arm{left:50%;bottom:1%;width:max(290px,65%);z-index:5;opacity:0;transform:translate(-50%,8%) scale(.72)}
.theater.st2 .t-arm{opacity:1;transform:translate(-45%,23%) scale(1)}
.theater.st3 .t-arm{opacity:0;transform:translate(-50%,-12%) scale(.88)}
.t-final{left:50%;top:46%;width:min(560px,60%);z-index:6;opacity:0;transform:translate(-50%,-50%) scale(.82)}
.theater.st3 .t-final{opacity:1;transform:translate(-50%,-50%) scale(1)}
.t-sig{position:absolute;z-index:7;left:4%;right:4%;bottom:15%;display:flex;justify-content:center;opacity:0;transform:translateY(20px);transition:all .8s .3s}
.theater.st3 .t-sig{opacity:1;transform:none}
.t-sig .n{background:rgba(13,53,87,.94);border:1px solid #2A6DB1;border-radius:9px;padding:7px 13px;font-size:12.5px;font-weight:700;color:var(--text-on-deep);white-space:nowrap}
.t-sig .n.hl{border-color:var(--color-accent-diy);background:rgba(138,90,18,.9)}
.t-sig .w{align-self:center;flex:1;max-width:54px;min-width:16px;height:4px;background:linear-gradient(90deg,#2A6DB1,var(--hud-info));border-radius:2px;position:relative;overflow:hidden}
.t-sig .w::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,#fff,transparent);animation:spark 1.4s infinite}
@keyframes spark{from{transform:translateX(-100%)}to{transform:translateX(100%)}}
@media(max-width:767px){
  .t-sig{left:2%;right:2%;bottom:9%;flex-wrap:wrap;gap:5px}
  .t-sig .n{font-size:10.5px;padding:5px 8px;white-space:normal;min-width:0;flex:0 1 auto;text-align:center}
  .t-sig .w{min-width:8px;max-width:24px}
}
body.theater-off #theater2 .t-anim{display:block}
@media(prefers-reduced-motion:reduce){#theater2 .t-media{transition:none} #theater2 .t-host{animation:none}}

/* 电气接入 · STEP 3 DIY 部件标注 */
.diy-marker{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:8;opacity:0;transition:opacity .5s var(--ease-out)}
.theater.st2 .diy-marker{opacity:1}
.diy-box{fill:none;stroke:#E8913A;stroke-width:3;stroke-dasharray:14 10;stroke-linecap:round;filter:drop-shadow(0 0 8px rgba(232,145,58,.55))}
.diy-tag rect{fill:#E8913A;filter:drop-shadow(0 6px 14px rgba(232,145,58,.45))}
.diy-tag .diy-icon{font-size:16px;fill:#1A1206}
.diy-tag .diy-text{fill:#1A1206;font-family:var(--font-ui);font-size:16px;font-weight:800;letter-spacing:.03em}

/* STEP 4 传导特效：区域 + 连接线 */
.t-final .final-fx{position:absolute;inset:0;width:100%;height:100%;z-index:1;overflow:visible;pointer-events:none;opacity:0;transition:opacity .8s .3s var(--ease-out)}
.theater.st3 .t-final .final-fx{opacity:1}
.zone-fill{fill:url(#finalZoneFill);stroke:none;mix-blend-mode:screen;pointer-events:none;opacity:0;}
.zone-flow{fill:none;stroke:#7FE0FF;stroke-width:2.2;stroke-linejoin:round;stroke-linecap:round;opacity:0;pointer-events:none;filter:drop-shadow(0 0 4px rgba(127,224,255,.5)) drop-shadow(0 0 10px rgba(0,229,255,.35))}
.zone-f2{stroke-width:1.4;}
.zone-glow{fill:none;stroke:#00E5FF;stroke-width:9;stroke-linecap:round;stroke-linejoin:round;opacity:0;filter:blur(6px);pointer-events:none}
.final-line .zone-flow{stroke-width:3.6}
.final-line .zone-f2{stroke-width:2.2}

/* STEP 4 轮流高亮 */
@keyframes seqGlow{
  0%      {opacity:0}
  5%      {opacity:1}
  28.33%  {opacity:1}
  33.33%  {opacity:0}
  100%    {opacity:0}
}
.zone-fill,.zone-flow,.zone-glow{animation-name:none;animation-duration:3.6s;animation-timing-function:ease-in-out;animation-iteration-count:infinite}
.theater.st3 .zone-fill,.theater.st3 .zone-flow,.theater.st3 .zone-glow{animation-name:seqGlow}

/* S3 container overrides */
body.theater-on #sdk-electrical .theater{height:min(64vh,620px);min-height:380px}
body.theater-on #sdk-electrical .theater-head{margin-bottom:14px}
body.theater-on #sdk-electrical .theater-head h2{font-size:clamp(24px,2.8vw,36px)}
body.theater-on #sdk-electrical .caption{margin-top:14px;padding:10px 24px}
body.theater-on #sdk-electrical .prog{margin-top:12px}

/* ---------- 8. Pin definition sub-screen (merged into S3) ---------- */
#sdk-electrical .sub-screen{display:none}
#sdk-electrical .sub-screen.on{display:block;animation:subFadeIn .5s var(--ease-out)}
@keyframes subFadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
#screen-pins .pin-panel{display:grid;grid-template-columns:minmax(200px,260px) minmax(0,1fr);gap:clamp(20px,3vw,44px);align-items:center;padding:clamp(20px,3vh,36px) clamp(20px,3vw,40px);background:radial-gradient(ellipse at 62% 46%,#0C2A44 0%,#061524 78%);border:1px solid #24506F;border-radius:var(--radius-l);box-shadow:var(--shadow-deep);min-height:min(56vh,540px);overflow:hidden}
#screen-pins .pin-head{color:#EAF6FF;text-align:left}
#screen-pins .pin-head h2{color:#EAF6FF;font-size:clamp(20px,2.2vw,28px);line-height:1.25;margin:0 0 12px}
#screen-pins .pin-head p{color:var(--text-on-deep-muted);font-size:clamp(12.5px,1.1vw,14.5px);line-height:1.7;margin:0}
#screen-pins .pin-scroll{width:100%;max-width:none;margin:0}
#screen-pins .pin-base-svg{width:100%;height:auto;display:block}
.pin-base-svg{width:100%;height:auto;display:block}
.pin-board-tag{position:absolute;right:12px;top:10px;z-index:2;font-family:var(--font-mono);font-size:11.5px;color:#7FA6C4;background:rgba(7,24,43,.78);border:1px solid #1D3A55;border-radius:6px;padding:2px 8px}
.pin-callout{opacity:0;transition:opacity .5s var(--ease-out)}
.pin-callout.pin-show{opacity:1}
.pin-leader{fill:none;stroke:#37C0FF;stroke-width:2.5;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .9s var(--ease-out);filter:drop-shadow(0 0 7px rgba(55,192,255,.6))}
.pin-callout.pin-show .pin-leader{stroke-dashoffset:0}
.pin-anchor{stroke:rgba(255,255,255,.88);stroke-width:1.6;filter:drop-shadow(0 0 6px rgba(55,192,255,.55))}
.pin-num{font-family:var(--font-mono);font-size:13.5px;font-weight:700;fill:#EAF6FF;paint-order:stroke;stroke:#061524;stroke-width:3.5}
.pin-tag rect{fill:rgba(4,19,34,.92);stroke:rgba(90,190,255,.62);filter:drop-shadow(0 8px 18px rgba(0,0,0,.35))}
.pin-tag .pt-title{fill:#D8ECF9;font-family:var(--font-mono);font-size:18px;font-weight:700}
.pin-tag .pt-pins{fill:#37C0FF;font-family:var(--font-mono);font-size:16.5px;font-weight:700}
.pin-tag .pt-sub{fill:#8FB3CC;font-size:16.5px}
@media(max-width:860px){#screen-pins .pin-panel{grid-template-columns:1fr;min-height:0;padding:24px 20px 28px} #screen-pins .pin-head{text-align:center}}
@media(max-width:767px){.pin-scroll{overflow-x:hidden} .pin-base-svg{width:100%;max-width:100%;height:auto;display:block}}
@media(prefers-reduced-motion:reduce){.pin-callout,.pin-leader{transition:none}}

/* ---------- 9. Scene 3 — mechanical access (S5) ---------- */
.guide-stage{
  position:relative;
  width:min(100%, calc(64vh * 16 / 10), 1500px);   /* ★ 更高一些 */
  margin:0 auto;
  aspect-ratio:2560 / 1600;                         /* ★ 与 viewBox 一致 */
  border-radius:var(--radius-l);
  overflow:hidden;
  background:radial-gradient(ellipse at 50% 40%,#0C2A44 0%,#061524 72%);
  border:1px solid var(--border-on-deep);
  box-shadow:var(--shadow-deep);
}
body.theater-on #sdk-mechanical .theater-head{margin-bottom:14px}
body.theater-on #sdk-mechanical .caption{margin-top:14px;padding:12px 24px}
body.theater-on #sdk-mechanical .prog{margin-top:12px}
.guide-frame{position:absolute;inset:0}
.guide-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:fill;      /* 撑满容器，与 SVG 完全重合 */
  user-select:none;
  pointer-events:none;
}
.guide-svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
.guide-svg path:not(.part-highlight),.guide-svg use{fill:none!important}
.guide-node{opacity:0;visibility:hidden;transition:opacity .55s var(--ease-out),visibility 0s .55s;pointer-events:none}
.guide-node.show{opacity:1;visibility:visible;transition:opacity .55s var(--ease-out),visibility 0s 0s}
.guide-node .guide-line,.guide-node .guide-dot{transition:none!important}
.guide-line{fill:none;stroke:#00B4FF;stroke-width:3.7;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:21 16;opacity:0;transition:opacity .5s var(--ease-out)}
.guide-node.show .guide-line{opacity:1}
.guide-dot{fill:#00B4FF;stroke:#ffffff;stroke-width:5.8;opacity:0;transition:opacity .3s}
.guide-node.show .guide-dot{opacity:1}
.guide-node[data-gstep="2"] .guide-line{stroke:#FFB84D!important;filter:drop-shadow(0 0 4px rgba(232,145,58,.6))}
.guide-node[data-gstep="2"] .guide-dot{fill:#FFB84D!important;stroke:#fff;filter:drop-shadow(0 0 6px rgba(232,145,58,.7))}
.guide-callout{position:absolute;width:clamp(120px,14vw,190px);max-height:calc(100% - 12px);overflow:hidden;opacity:0;transform:translateY(8px);transition:opacity .45s var(--ease-out),transform .45s var(--ease-out);pointer-events:none}
.guide-callout.show{opacity:1;transform:none}
.guide-callout.right{text-align:right}
.guide-callout.right .glyph{margin-left:auto}
.glyph{display:grid;place-items:center;width:clamp(22px,1.8vw,28px);height:clamp(22px,1.8vw,28px);border-radius:50%;background:#00B4FF;color:#fff;font-size:clamp(11px,.9vw,13px);font-weight:800;line-height:1;box-shadow:0 0 0 4px rgba(0,180,255,.15);margin-bottom:clamp(5px,.6vw,9px)}
.guide-callout .txt-title{display:block;color:#EAF6FF;font-size:clamp(10.5px,1.15vw,12px);font-weight:800;letter-spacing:.04em;text-transform:uppercase;line-height:1.35;margin-bottom:3px}
.guide-callout .txt-desc{color:var(--text-on-deep-muted);font-size:clamp(9.5px,.92vw,11.5px);line-height:1.5;font-style:italic;margin:0;opacity:.9;font-weight:600}
.guide-callout:not(.is-hl) .txt-title{color:#37C0FF;text-shadow:0 0 10px rgba(55,192,255,.35)}
.guide-callout:not(.is-hl) .txt-desc{color:#9FC0D6}
.guide-callout.is-hl .glyph{background:var(--color-accent-diy)}
.guide-callout.is-hl .txt-title{font-size:clamp(14px,1.15vw,18px);color:var(--color-accent-diy);letter-spacing:.06em;text-shadow:0 0 16px rgba(232,145,58,.65)}
.guide-callout.is-hl .txt-desc{font-size:clamp(11px,.92vw,13.5px);color:#FFB84D;font-style:italic;font-weight:600}

/* Scene 3 current FX */
.guide-node.is-conduct .guide-line{stroke:#7FE0FF;filter:drop-shadow(0 0 3px rgba(0,229,255,.7))}
/* .guide-conduct-glow{fill:none;stroke:#00E5FF;stroke-width:9;stroke-linecap:round;stroke-linejoin:round;filter:blur(6px);opacity:.35;pointer-events:none} */
/* .guide-conduct-flow{fill:none;stroke:#EAFBFF;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;pointer-events:none;stroke-dasharray:none!important;stroke-dashoffset:0!important;animation:none!important;filter:drop-shadow(0 0 4px #A8ECFF) drop-shadow(0 0 9px #37C0FF) drop-shadow(0 0 16px rgba(0,229,255,.6))} */
/* .guide-conduct-flow.flow-2{stroke-width:1.4;opacity:.55;animation:none!important;stroke-dasharray:none!important;stroke-dashoffset:0!important} */
.product-fx{opacity:0;transition:opacity .6s var(--ease-out);pointer-events:none}
.product-fx.show{opacity:1}
.fx-glow{fill:none;stroke:#00E5FF;stroke-width:25.6;stroke-linecap:round;stroke-linejoin:round;opacity:.4;filter:blur(16px);pointer-events:none;}
.fx-flow{fill:none;stroke:#7FE0FF;stroke-width:7;stroke-linecap:round;stroke-linejoin:round;opacity:.35;filter:drop-shadow( 0 0 9px #7FE0FF) drop-shadow(0 0 23px rgba(0,229,255,.45));stroke-dasharray:none!important;stroke-dashoffset:0!important;}
.fx-flow-2{stroke-width:2.8;opacity:.5;stroke-dasharray:none!important;stroke-dashoffset:0!important;}
/* 外发光层：底 → 呼吸 */
.guide-conduct-glow{
  fill:none;
  stroke:#00E5FF;
  stroke-width:21;
  stroke-linecap:round;
  stroke-linejoin:round;
  filter:blur(14px);
  opacity:0;                            /* ★ 不再固定 .35 */
  pointer-events:none;
}
.guide-node.show .guide-conduct-glow{
  animation:lineGlow 2.6s ease-in-out infinite;
}
/* 主线条：底 → 呼吸 */
.guide-conduct-flow{
  fill:none;
  stroke:#EAFBFF;
  stroke-width:5.6;
  stroke-linecap:round;
  stroke-linejoin:round;
  pointer-events:none;
  stroke-dasharray:none!important;
  stroke-dashoffset:0!important;
  animation:none;
  opacity:0;                            /* ★ 默认不可见 */
  filter:drop-shadow(0 0 9px #A8ECFF) drop-shadow(0 0 21px #37C0FF) drop-shadow(0 0 37px rgba(0,229,255,.6));
}
.guide-node.show .guide-conduct-flow{
  animation:lineGlow 2.6s ease-in-out infinite;
}

/* 第二层（更细更暗）：跟随同一呼吸节奏 */
.guide-conduct-flow.flow-2{
  stroke-width:3.3;
  animation:none;
  opacity:0;
}
.guide-node.show .guide-conduct-flow.flow-2{
  animation:lineGlowF2 2.6s ease-in-out infinite;
}
/* =====================================================================
 * 场景 3 · 部件高亮
 * - step1/2 出现但不可见（等待）
 * - step3+ 才启动呼吸
 * ===================================================================== */
.part-highlight{
  fill:url(#partGlowGrad) !important;      /* 与场景2同色的径向渐变 */
  stroke:#7FE0FF;                          /* ★ 描边 = 高亮边框 */
  stroke-width:4.7;
  stroke-linejoin:round;
  stroke-linecap:round;
  pointer-events:none;
  mix-blend-mode:screen;
  opacity:0;                               /* 默认完全不可见 */
  filter:drop-shadow(0 0 12px rgba(127,224,255,.6));
  will-change:opacity;
}

/* ★ 只在容器处于 step3 / step4 时启动呼吸 */
#guideTheater[data-gstep="2"] .guide-node.show .part-highlight,
#guideTheater[data-gstep="3"] .guide-node.show .part-highlight,
#guideTheater[data-gstep="4"] .guide-node.show .part-highlight{
  animation:partGlow 2.6s ease-in-out infinite;
}

@keyframes partGlow{
  0%,100%{ opacity:.2;  stroke-opacity:.35 }
  50%    { opacity:.95; stroke-opacity:1   }
}

@keyframes lineBreath{
  0%     { opacity:0 }
  8%     { opacity:.7 }
  50%    { opacity:1 }
  92%    { opacity:.7 }
  100%   { opacity:0 }
}
/* 场景3 产品图上的亮线（fx-flow / fx-glow） */
.product-fx.show .fx-flow,
.product-fx.show .fx-glow,
.product-fx.show .fx-flow-2{
  animation:fxBreath 2.6s ease-in-out infinite;
}
.product-fx.show .fx-flow-2{
  animation-delay:-0.8s;                   /* 错开半拍，视觉更丰富 */
}
@keyframes fxBreath{
  0%,100%{ opacity:0 }
  50%    { opacity:1 }
}
@media(max-width:991px){
  .guide-callout{width:clamp(100px,18vw,150px)}
  body.theater-on #sdk-mechanical .theater-head{margin-bottom:6px!important}
  body.theater-on #sdk-mechanical .theater-head h2{font-size:clamp(20px,3vw,26px)!important}
  body.theater-on #sdk-mechanical .theater-head p{font-size:12.5px!important;margin-top:2px!important;line-height:1.4!important}
  body.theater-on #sdk-mechanical .caption{margin-top:8px!important;padding:8px 16px!important}
  body.theater-on #sdk-mechanical .caption h3{font-size:15px!important;margin-top:2px!important}
  body.theater-on #sdk-mechanical .caption p{font-size:12px!important;line-height:1.4!important;margin-top:2px!important;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  body.theater-on #sdk-mechanical .prog{margin-top:8px!important}
  body.theater-on #sdk-mechanical .prog button{width:9px!important;height:9px!important}
}
@media(max-width:560px){
  .guide-callout{width:clamp(80px,26vw,120px)}
  .guide-callout .txt-title{font-size:9.5px}
  .guide-callout .txt-desc{font-size:8.5px;line-height:1.35}
  .glyph{width:18px;height:18px;font-size:9px}
}

/* ---------- 10. S5 — exploded assembly theater ---------- */
.explode-grid{display:grid;grid-template-columns:11fr 9fr;gap:clamp(18px,3vw,34px);align-items:center}
@media(max-width:920px){.explode-grid{grid-template-columns:1fr}}
.explode-theater{position:relative;height:min(62vh,560px);border-radius:var(--radius-l);background:radial-gradient(ellipse at 50% 38%,#0C2A44 0%,#061524 74%);border:1px solid var(--border-on-deep);overflow:hidden;box-shadow:var(--shadow-deep);perspective:1100px}
body.theater-off .explode-theater{height:480px}
@media(max-width:767px){body.theater-off .explode-theater{height:72vw}}
.layer{position:absolute;left:42%;width:min(260px,62%);transition:transform var(--dur-slow) var(--ease-spring),opacity .7s;transform-style:preserve-3d}
.layer .card{background:rgba(10,28,46,.94);border:1px solid var(--border-on-deep);border-radius:var(--radius-m);padding:12px;box-shadow:0 16px 44px rgba(0,0,0,.55);position:relative}
.layer .num-tag{position:absolute;left:calc(100% + 12px);top:50%;transform:translateY(-50%);width:max-content;max-width:200px;line-height:1.45;font-size:12.5px;color:var(--text-on-deep);background:rgba(6,26,44,.92);border:1px solid var(--border-on-deep);border-radius:8px;padding:6px 12px;transition:opacity .4s}
.layer .num-tag b{color:var(--hud-info);display:block;font-size:13.5px}
#ly-rov .num-tag{top:6px;transform:none}
.explode.p3 .num-tag,.explode.p4 .num-tag{opacity:0}
@media(min-width:921px) and (max-width:1200px){.layer .num-tag{max-width:170px;font-size:11.5px}}
@media(max-width:920px){.layer .num-tag{display:none}}
#ly-acc{top:2%;transform:translateX(-50%) rotateX(46deg) translateY(-40px)}
#ly-adapter{top:26%;transform:translateX(-50%) rotateX(46deg) translateY(-30px)}
#ly-bracket{top:50%;transform:translateX(-50%) rotateX(46deg) translateY(-20px)}
#ly-rov{top:72%;transform:translateX(-50%) rotateX(46deg)}
#ly-acc .card{border:2px dashed var(--color-accent-diy)}
#ly-adapter .card{border:2px solid var(--color-accent-diy);box-shadow:0 0 46px rgba(232,145,58,.28)}
#ly-adapter .num-tag{border-color:var(--color-accent-diy)}
#ly-adapter .num-tag b{color:#FFB84D}
#ly-bracket .card{border:2px solid var(--color-primary)}
#ly-rov{filter:drop-shadow(0 26px 40px rgba(0,0,0,.7))}
.part-badge{position:absolute;top:-12px;left:10px;font-size:11px;font-weight:800;border-radius:6px;padding:3px 10px;letter-spacing:.06em;z-index:2;white-space:nowrap}
.part-badge.diy{background:var(--color-accent-diy);color:#241604}
.part-badge.you{background:#FFB84D;color:#241604}
.part-badge.qysea{background:var(--color-primary);color:#04263A}
.explode.p1 #ly-adapter{transform:translateX(-50%) rotateX(0) translateY(0)}
.explode.p2 #ly-adapter{transform:translateX(-50%) rotateX(0) translateY(0)}
.explode.p2 #ly-acc{transform:translateX(-50%) rotateX(0) translateY(0) scale(.9)}
.explode.p3 #ly-bracket{transform:translateX(-50%) rotateX(0) translateY(0)}
.explode.p3 #ly-adapter{transform:translateX(-50%) translateY(80px) scale(.95)}
.explode.p3 #ly-acc{transform:translateX(-50%) translateY(160px) scale(.86)}
.explode.p4 #ly-bracket{transform:translateX(-50%) translateY(-56px)}
.explode.p4 #ly-adapter{transform:translateX(-50%) translateY(24px) scale(.95)}
.explode.p4 #ly-acc{transform:translateX(-50%) translateY(104px) scale(.86)}
.explode.p4 #ly-rov{transform:translateX(-50%) translateY(-90px)}
.lockring{position:absolute;left:50%;top:46%;z-index:9;opacity:0;transform:translate(-50%,-50%) scale(1.7);transition:opacity .5s .4s,transform .5s .4s;pointer-events:none;text-align:center}
.explode.p4 .lockring{opacity:1;transform:translate(-50%,-50%) scale(1)}
.lockring .ring{width:min(340px,74vw);height:min(340px,74vw);margin:0 auto;border:4px solid var(--color-accent-ai);border-radius:50%;box-shadow:0 0 60px rgba(34,197,139,.45),inset 0 0 60px rgba(34,197,139,.28)}
.lockring .txt{margin-top:14px;color:var(--color-accent-ai);font-weight:800;font-size:19px;letter-spacing:.12em;white-space:nowrap;text-shadow:0 0 24px rgba(34,197,139,.7)}
.side-video{position:relative;border-radius:var(--radius-m);overflow:hidden;border:1px solid var(--border-on-deep);box-shadow:var(--shadow-deep)}
.side-video .cap{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(3,15,26,.93));padding:44px 16px 14px;font-size:13px;color:var(--text-on-deep-muted);text-align:center;z-index:2}
.side-video .ph-tag{top:10px;bottom:auto}
.step-readout{margin-top:14px;text-align:center;font-size:14.5px;color:var(--text-muted);min-height:24px}
.step-readout b{color:var(--color-accent-diy)}
.docs-link{display:inline-flex;margin-top:12px;font-weight:700}

/* ---------- 11. S6 — Platform capabilities ---------- */
.why-bg{position:absolute;inset:0;z-index:0;overflow:hidden}
.why-bg video{width:100%;height:100%;object-fit:cover;display:block}
.why-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(4,12,22,.84) 0%,rgba(4,12,22,.62) 55%,rgba(4,12,22,.80) 100%)}
.why-video{position:relative;min-height:100vh;display:flex;align-items:center;padding:calc(var(--nav-offset) + 24px) 0 120px;background:var(--bg-deep)}
.why-video .container{position:relative;z-index:1}
.why-video .kicker{background:var(--color-primary);color:#FFF;border-color:var(--color-primary)}
.why-video h2{color:#EAF6FF}
.why-video p{color:var(--text-on-deep-muted)}
.why-grid{display:flex;flex-direction:column;gap:clamp(18px,2.6vh,34px);align-items:center;width:100%}
.why-grid > div:first-child{max-width:820px;text-align:center;margin:0 auto}
.why-grid > div:first-child .kicker{margin-bottom:12px}
.why-grid > div:first-child h2{font-size:clamp(24px,3vw,38px);margin:0 0 10px}
.why-grid > div:first-child p{margin-top:6px!important;font-size:15px;max-width:680px;margin-inline:auto}
.cap-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(12px,1.6vw,18px);width:100%;max-width:1180px;margin:0 auto;align-items:stretch}
.cap-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-m);box-shadow:var(--shadow-card);min-height:0;padding:clamp(14px,1.6vh,20px) clamp(16px,1.8vw,22px);transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast)}
.cap-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card-hover)}
.cap-card .num{font-family:var(--font-mono);color:var(--color-primary);font-weight:800;font-size:12px;letter-spacing:.1em;margin-bottom:6px}
.cap-card .cap-ico{margin:6px 0 8px;color:var(--color-primary-dark)}
.cap-card .cap-ico svg{width:clamp(28px,2.6vw,36px);height:clamp(28px,2.6vw,36px)}
.cap-card .cap-kicker{font-size:10.5px;font-weight:800;letter-spacing:.14em;color:var(--text-muted);text-transform:uppercase}
.cap-card h3{font-size:clamp(14px,1.3vw,16px);margin:4px 0 5px}
.cap-card p{font-size:clamp(12px,1.05vw,13.5px);color:var(--text-body);flex-grow:1;line-height:1.55}
@media(max-width:991px){.why-video{min-height:auto;padding:72px 0 56px} .cap-cards{grid-template-columns:repeat(3,1fr)} .why-grid > div:first-child{text-align:center}}
@media(max-width:767px){.cap-cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.cap-cards{grid-template-columns:1fr} .why-grid > div:first-child{text-align:left} .why-grid > div:first-child p{margin-inline:0}}
[data-rev]{opacity:0;transform:translateY(40px);transition:opacity .8s var(--ease-out),transform .8s var(--ease-out)}
[data-rev].in{opacity:1;transform:none}

/* ---------- 12. S7 — applications & research cases ---------- */
.logo-marquee{margin-top:36px}
.logo-marquee-title{text-align:center;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted);margin:0 0 22px;font-weight:700}
.logo-marquee-viewport{position:relative;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 8%,#000 92%,transparent 100%);mask-image:linear-gradient(90deg,transparent 0,#000 8%,#000 92%,transparent 100%)}
.logo-marquee-track{display:flex;align-items:center;gap:44px;width:max-content;padding:8px 0;animation:logoMarquee 40s linear infinite;will-change:transform}
.logo-marquee-viewport:hover .logo-marquee-track{animation-play-state:paused}
@keyframes logoMarquee{from{transform:translate3d(0,0,0)}to{transform:translate3d(-50%,0,0)}}
@media(prefers-reduced-motion:reduce){.logo-marquee-track{animation:none;flex-wrap:wrap;justify-content:center;width:auto;gap:24px}}
.logo-ph{height:56px;min-width:128px;border-radius:var(--radius-s);background:var(--bg-card);border:1px solid var(--border-card);display:flex;align-items:center;justify-content:center;gap:8px;padding:0 18px;font-family:var(--font-mono);font-size:11.5px;color:var(--text-muted);white-space:nowrap;flex:0 0 auto;transition:opacity var(--dur-fast),filter var(--dur-fast),border-color var(--dur-fast)}
.logo-ph svg{color:var(--text-muted);flex:0 0 auto}
.logo-ph.primary{filter:grayscale(1);opacity:.78}
.logo-ph.primary:hover{filter:none;opacity:1;border-color:var(--color-primary)}
.case-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-l);box-shadow:var(--shadow-card);padding:clamp(22px,3.4vw,40px);display:grid;grid-template-columns:11fr 9fr;gap:clamp(20px,3vw,40px);margin-bottom:48px;align-items:center}
.case-card:nth-child(even) .case-media{order:-1}
@media(max-width:860px){.case-card{grid-template-columns:1fr} .case-card:nth-child(even) .case-media{order:0}}
.case-card h3{margin:12px 0 10px;font-size:22px}
.workflow-box{margin:16px 0;background:var(--bg-section-alt);border:1px dashed var(--border-strong);border-radius:var(--radius-s);padding:12px 16px;font-size:13.5px;color:var(--text-body)}
.workflow-box b{display:block;font-size:11px;letter-spacing:.16em;color:var(--color-primary-dark);margin-bottom:4px}
.tag-row{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 20px;justify-items:start}
.tag{background:rgba(0,169,206,.08);border:1px solid rgba(0,169,206,.3);color:var(--color-primary-dark);border-radius:var(--radius-pill);padding:4px 13px;font-size:12px;font-weight:700;letter-spacing:.05em}
.case-ref{border-top:1px solid var(--border-card);padding-top:18px}
.case-no-media .case-right .case-ref{border-top:0;padding-top:0}
.case-ref .ref-kicker{font-size:11.5px;font-weight:800;letter-spacing:.14em;color:var(--color-accent-track);text-transform:uppercase}
.case-ref .org{font-weight:800;color:var(--text-title);margin:6px 0 4px}
.case-ref p{font-size:14px}
.case-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
.case-links a{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--border-strong);border-radius:var(--radius-pill);padding:8px 18px;font-size:13.5px;font-weight:700;color:var(--text-title)}
.case-links a:hover{border-color:var(--color-primary);color:var(--color-primary-dark)}
.case-media .ph{aspect-ratio:16/10}
.case-right{display:flex;flex-direction:column;justify-content:center;gap:14px;padding-left:6px;border-left:1px solid var(--border-card)}
.case-no-media .case-right .ref-kicker{color:var(--color-accent-track);font-size:11.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
.case-no-media .case-right .org{font-size:20px;font-weight:800;color:var(--text-title);margin:4px 0 6px}
.case-no-media .case-right p{font-size:14.5px;line-height:1.65;color:var(--text-body)}
.case-no-media .case-right .case-links{margin-top:18px}
.case-tabs{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:26px}
.case-tab{display:inline-flex;align-items:baseline;gap:9px;border:1.5px solid var(--border-strong);border-radius:var(--radius-pill);background:var(--bg-card);padding:11px 22px;transition:all var(--dur-fast) var(--ease-out);box-shadow:var(--shadow-card)}
.case-tab:hover{border-color:var(--color-primary);transform:translateY(-2px)}
.case-tab .ct-num{font-size:12px;font-weight:800;color:var(--color-primary);letter-spacing:.08em}
.case-tab .ct-name{font-size:14.5px;font-weight:750;color:var(--text-title);white-space:nowrap}
.case-tab.on{background:var(--color-primary);border-color:var(--color-primary);box-shadow:0 8px 22px rgba(0,169,206,.3)}
.case-tab.on .ct-num,.case-tab.on .ct-name{color:#fff}
.case-panel .case-single{margin-bottom:0;animation:none}
.case-panel.case-swap .case-single{animation:caseIn .45s var(--ease-out)}
@keyframes caseIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@media(max-width:640px){.case-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px} .case-tab{justify-content:center;padding:10px 8px} .case-tab .ct-name{white-space:normal;text-align:center;line-height:1.35}}
.logo-wall{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:8px}
.logo-wall .logo-ph{height:56px;min-width:128px;border-radius:var(--radius-s);background:var(--bg-card);border:1px solid var(--border-card);display:flex;align-items:center;justify-content:center;gap:8px;padding:0 18px;filter:grayscale(1);opacity:.75;transition:filter var(--dur-fast),opacity var(--dur-fast);font-family:var(--font-mono);font-size:11.5px;color:var(--text-muted)}
.logo-wall .logo-ph:hover{filter:none;opacity:1}
.logo-wall .logo-ph svg{color:var(--text-muted)}

/* ---------- 13. S8 — Start building / core pack ---------- */
.kit-grid{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,4vw,56px);align-items:center}
@media(max-width:900px){.kit-grid{grid-template-columns:1fr}}
.kit-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-l);box-shadow:var(--shadow-card);overflow:hidden;display:grid;grid-template-columns:1fr 1fr}
@media(max-width:640px){.kit-card{grid-template-columns:1fr}}
.kit-card .ph{border-radius:0;border:0;box-shadow:none;aspect-ratio:auto;min-height:260px}
.kit-body{padding:clamp(20px,3vw,32px)}
.kit-body .pack-label{font-size:12px;font-weight:800;letter-spacing:.18em;color:var(--color-primary-dark)}
.kit-body h3{margin:8px 0 14px;font-size:22px}
.kit-items{list-style:none;margin-bottom:20px}
.kit-items li{padding:7px 0 7px 26px;position:relative;font-size:14.5px}
.kit-items li::before{content:"";position:absolute;left:2px;top:13px;width:9px;height:9px;border-radius:50%;background:var(--color-primary)}
.kit-body .sub-link{display:inline-block;margin-top:14px;font-size:14px;font-weight:600}

/* ---------- 14. S9 — contact form ---------- */
.form-card{background:var(--bg-card);border:1px solid var(--border-card);border-radius:var(--radius-l);box-shadow:var(--shadow-card);padding:clamp(22px,3.4vw,42px);max-width:960px;margin:0 auto}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 22px;margin-top:24px}
@media(max-width:700px){.form-grid{grid-template-columns:1fr}}
.field.full{grid-column:1/-1}
.field label{display:block;font-size:13.5px;font-weight:700;color:var(--text-title);margin-bottom:6px}
.field label .req{color:#C0392B;margin-left:3px}
.field input,.field select,.field textarea{width:100%;border:1.5px solid var(--border-strong);border-radius:var(--radius-s);padding:11px 13px;font-size:14.5px;font-family:inherit;color:var(--text-title);background:#FDFEFF;transition:border-color var(--dur-fast),box-shadow var(--dur-fast)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(0,169,206,.15)}
.field textarea{min-height:96px;resize:vertical}
.field [aria-invalid="true"]{border-color:#C0392B}
.field .err{display:none;font-size:12.5px;color:#C0392B;margin-top:5px;font-weight:600}
.field.has-err .err{display:block}
.form-foot{margin-top:22px}
.form-foot .btn{width:auto}
@media(max-width:700px){.form-foot .btn{width:100%}}
.privacy{margin-top:14px;font-size:12.5px;color:var(--text-muted)}
.form-success{text-align:center;padding:48px 20px}
.form-success .ok-ring{width:72px;height:72px;border-radius:50%;border:3px solid var(--color-accent-ai);display:grid;place-items:center;margin:0 auto 18px;color:var(--color-accent-ai)}
.form-success h3{margin-bottom:8px}

/* Form: field-pair + hear dropdown + attachment */
.field-pair{grid-column:1/-1;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:18px 22px;align-items:start}
@media(max-width:700px){.field-pair{grid-template-columns:1fr}}
.field[data-field="hear"] .sr{position:relative}
.field[data-field="hear"] .d1{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:47px;padding:11px 13px;border:1.5px solid var(--border-strong);border-radius:var(--radius-s);background:#FDFEFF;font-size:14.5px;color:var(--text-title);cursor:pointer;transition:border-color var(--dur-fast),box-shadow var(--dur-fast)}
.field[data-field="hear"] .d1:hover{border-color:var(--color-primary)}
.field[data-field="hear"] .sr.is-open .d1{border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(0,169,206,.15)}
.field[data-field="hear"] .tip{margin:0;font-size:14.5px;color:var(--text-muted);line-height:1.4}
.field[data-field="hear"] .chose_value{margin:0;font-size:14.5px;color:var(--text-title);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.field[data-field="hear"] .icon{flex:0 0 auto;display:flex;align-items:center;color:var(--text-muted);transition:transform .25s ease}
.field[data-field="hear"] .sr.is-open .icon{transform:rotate(180deg)}
.field[data-field="hear"] .d2{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:30;max-height:320px;overflow-y:auto;padding:8px;background:#fff;border:1px solid var(--border-card);border-radius:var(--radius-m);box-shadow:0 12px 32px rgba(11,34,57,.12)}
.field[data-field="hear"] .level1 + .level1,.field[data-field="hear"] .d2 > p + .level1{border-top:1px solid #f0f1f3;margin-top:4px;padding-top:4px}
.field[data-field="hear"] .level1-title{padding:10px 12px;margin:0;font-size:14px;color:var(--text-title);cursor:pointer;border-radius:6px;display:flex;align-items:center;justify-content:space-between}
.field[data-field="hear"] .level1-title:hover{background:#f5f7fa}
.field[data-field="hear"] .level1-title::after{content:"›";color:#b0b6bf;transform:rotate(90deg);transition:transform .2s}
.field[data-field="hear"] .level1-title.is-open::after{transform:rotate(-90deg)}
.field[data-field="hear"] .level2-items{padding:4px 0 4px 8px}
.field[data-field="hear"] .level2-items > p{padding:8px 12px;margin:0;font-size:13.5px;color:#4a5058;cursor:pointer;border-radius:6px}
.field[data-field="hear"] .level2-items > p:hover{background:#eaf7fd;color:var(--color-primary)}
.field[data-field="hear"] .write{display:flex;align-items:center;gap:8px;padding:4px 12px;font-size:13.5px;color:#4a5058}
.field[data-field="hear"] .write .tx{flex:1}
.field[data-field="hear"] .write_input{width:100%;padding:8px 10px;font-size:13.5px;border:1px solid var(--border-strong);border-radius:6px;outline:none;background:#FDFEFF}
.field[data-field="hear"] .write_input:focus{border-color:var(--color-primary)}
.field[data-field="attachment"] .attachment-dropzone{display:flex;align-items:center;justify-content:center;width:100%;min-height:47px;padding:11px 13px;border:1.5px dashed var(--border-strong);border-radius:var(--radius-s);background:#FDFEFF;text-align:center;cursor:pointer;transition:border-color var(--dur-fast),background var(--dur-fast)}
.field[data-field="attachment"] .attachment-dropzone:hover,.field[data-field="attachment"] .attachment-dropzone.is-dragover{border-color:var(--color-primary);background:#F0FAFE}
.field[data-field="attachment"] .dropzone-text{font-size:14.5px;color:var(--text-muted);line-height:1.4}
.attachment-list{margin-top:10px}
.attachment-item{display:flex;align-items:center;gap:10px;padding:8px 12px;margin-bottom:8px;font-size:13px;background:#f5f7fa;border-radius:var(--radius-s)}
.attachment-item .attachment-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-title)}
.attachment-item .attachment-size{color:var(--text-muted)}
.attachment-item .attachment-remove{border:none;background:none;font-size:18px;line-height:1;color:var(--text-muted);cursor:pointer;padding:0 4px}
.attachment-item .attachment-remove:hover{color:#e5484d}
.attachment-progress{display:flex;align-items:center;gap:10px;margin-top:8px}
.attachment-progress .progress-bar{flex:1;height:6px;border-radius:3px;background:linear-gradient(90deg,var(--color-primary) 0%,var(--color-primary) 60%,#e6f6fc 60%);background-size:200% 100%;animation:attProgress 1.2s linear infinite}
@keyframes attProgress{0%{background-position:100% 0}100%{background-position:-100% 0}}
.attachment-progress .progress-text{font-size:12px;color:var(--text-muted)}

/* ---------- 15. S10 — footer ---------- */
.site-footer{background:var(--text-title);color:#B9CFDF;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 2fr 1fr;gap:36px;padding-bottom:44px}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr}}
.site-footer h4{color:#fff;font-size:14px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:16px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:17px}
.footer-product{margin-top:12px;font-size:14px;color:#8FB3CC}
.footer-links{list-style:none;columns:2;gap:24px}
@media(max-width:480px){.footer-links{columns:1}}
.footer-links li{margin-bottom:10px;break-inside:avoid}
.footer-links a{color:#B9CFDF;font-size:14.5px}
.footer-links a:hover{color:var(--hud-info)}
.social-row{display:flex;gap:10px}
.social-row a{width:40px;height:40px;border-radius:50%;border:1px solid #2A4A66;display:grid;place-items:center;color:#B9CFDF}
.social-row a:hover{color:#fff;border-color:var(--color-primary)}
.footer-bottom{border-top:1px solid #1D3A55;padding:22px 0 30px;font-size:12.5px;color:#7E9BB3}
.footer-bottom .row{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.footer-bottom .disclaimer{margin-top:10px;max-width:900px;line-height:1.7}
.footer-bottom .lang-switch{border-color:#2A4A66}
.footer-bottom .lang-switch button{color:#B9CFDF}
.footer-bottom .lang-switch button[aria-pressed="true"]{background:var(--color-primary);color:#04263A}

/* ---------- 16. Global responsive + reduced motion ---------- */
@media(max-width:991px){.hero-grid{grid-template-columns:1fr} .why-video{min-height:auto;padding:72px 0}}
@media(max-width:767px){.section{padding:64px 0} .hero{min-height:auto;padding:110px 0 90px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.15s!important}
  .hero [data-hero]{opacity:1;transform:none;animation:none}
  [data-rev]{opacity:1;transform:none}
  .final-fx{opacity:1}
  .zone-fill{animation:none;opacity:.6}
  .zone-flow{animation:none;opacity:.75;stroke-dashoffset:0}
  .zone-glow{animation:none}
}
.nav-btn-primary, .nav-btn-ghost {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.833333vw;
    font-weight: 500;
    transform: translateX(1vw);
    padding: 0 0.660417vw;
    border-radius: 1.04167vw;
    margin: 0px 2.5vw 0px 1.04167vw;
    background: rgb(255, 255, 255);
    transition: 0.6s;
}
.nav-btn-primary {
    color: rgb(0, 92, 185) !important;
}
.nav-btn-ghost {
    background: rgb(0, 92, 185);
    border: 1px solid #FFF;
}

/* =====================================================================
 * 移动端二级导航（.second_menu）
 * ===================================================================== */
@media(max-width:1024px){

  /* 外框：竖直排列 */
  .second_menu{
    flex-direction:column;
    align-items:stretch;
    padding:12px var(--space-gutter,20px) 16px;
    gap:10px;
  }

  /* SDK Development + 返回箭头：独占一行，靠左 */
  .second_menu .goTop{
    display:flex;
    align-items:center;
    gap:8px;
    font-size:14px;
    font-weight:700;
    color:#fff;
    padding:4px 0;
  }
  .second_menu .goTop svg{
    width:14px;
    height:14px;
    transform:rotate(90deg);     /* ★ 默认图标是"回到顶部"的向上箭头，转 90° 变成"返回" */
  }

  /* 菜单容器：竖向堆叠 */
  .second_menu .r{
    width:100%;
  }
  .second_menu .links{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:6px;
    width:100%;
  }

  /* 普通菜单项：一行一个 */
  .second_menu .links a{
    display:block;
    padding:10px 12px;
    font-size:14px;
    line-height:1.3;
    white-space:nowrap;          /* ★ 不折行 */
    border-radius:6px;
    color:#fff;
  }
  .second_menu .links a:hover{
    background:rgba(255,255,255,.08);
  }

  /* 主 CTA（Buy Development Package） */
  .second_menu .links a.nav-btn-primary{
    background:#fff;
    color:var(--color-primary,#005CB9);
    font-weight:800;
    margin-top:4px;
  }

  /* 次 CTA（Discuss Your Project） */
  .second_menu .links a.nav-btn-ghost{
    background:transparent;
    border:1.5px solid rgba(255,255,255,.55);
  }
}
/* =====================================================================
 * 移动端：剧场降级为「手动步进」
 * ===================================================================== */
@media(max-width:767px){

  /* 场景2：保留 t-anim，不要隐藏 */
  body.theater-off #sdk-electrical .t-anim,
  body.theater-off #sdk-mechanical .explode{
    display:block !important;
  }

  /* 移动端不 sticky，就是普通一块 */
  body.theater-off #sdk-electrical .stage-sec,
  body.theater-off #sdk-mechanical .stage-sec{
    height:auto !important;
  }
  body.theater-off #sdk-electrical .stage,
  body.theater-off #sdk-mechanical .stage{
    position:static !important;
    height:auto !important;
    padding:var(--space-section) 0;
  }

  /* 步进条 */
  .mobile-stepper{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:16px;
    margin:22px auto 0;
  }
  .mobile-stepper button{
    width:44px;
    height:44px;
    border-radius:50%;
    border:1.5px solid var(--border-strong);
    background:var(--bg-card);
    color:var(--text-title);
    font-size:20px;
    font-weight:800;
    line-height:1;
    display:grid;
    place-items:center;
    transition:border-color var(--dur-fast),color var(--dur-fast);
  }
  .mobile-stepper button:hover:not(:disabled){
    border-color:var(--color-primary);
    color:var(--color-primary);
  }
  .mobile-stepper button:disabled{opacity:.3;cursor:default}
  .mobile-stepper .ms-num{
    font-family:var(--font-mono);
    font-size:14px;
    font-weight:800;
    min-width:56px;
    text-align:center;
    color:var(--text-title);
  }
}
@media(min-width:768px){
  .mobile-stepper{display:none}
}
/* =====================================================================
 * 移动端专项修正
 * ===================================================================== */
@media(max-width:767px){

  /* ---- 隐藏原生 stepper，避免两套按钮 ---- */
  #s2Stepper{display:none !important}

  /* ---- 场景2：配件比主机小 ---- */
  .t-host{width:min(560px,72%)}
  .theater.st1 .t-host,
  .theater.st2 .t-host{width:min(560px,60%)}
  .t-ifc{width:min(210px,26%)}
  .t-arm{width:min(290px,50%)}
  .t-final{width:min(560px,72%)}

  /* ---- 场景3：卡片瘦身，只留编号+标题 ---- */
  .guide-callout{width:clamp(80px,26vw,110px)}
  .guide-callout .txt-title{font-size:9px;line-height:1.25}
  .guide-callout .txt-desc{display:none}
  .glyph{width:16px;height:16px;font-size:9px;margin-bottom:3px}
}
/* =====================================================================
 * 移动端专项修复
 * ===================================================================== */
@media(max-width:767px){

  /* ---------- 场景2：容器比例对齐 viewBox ---------- */
  #sdk-electrical .theater{
    height:auto !important;
    aspect-ratio:11/7;        /* ★ 与 diy-marker viewBox 0 0 1100 700 一致 */
    min-height:0 !important;
  }

  /* 配件改用 top 定位，不再挤底 */
  .t-host{top:38%}
  .theater.st1 .t-host,
  .theater.st2 .t-host{top:32%}
  .t-ifc{top:55%;bottom:auto}
  .t-arm{top:50%;bottom:auto}
  .t-final{top:46%}
}
@media(max-width:767px){
  html body #sdk-mechanical .guide-stage{
    width:100% !important;
    max-width:none !important;
    aspect-ratio:2560 / 1600 !important;   /* 保持比例 */
    height:auto !important;
    min-height:0 !important;
    padding:0 !important;
  }
  .guide-callout{width:clamp(90px,26vw,120px)}
}
/* =====================================================================
 * 移动端 · 场景3 最终覆盖
 * ===================================================================== */
@media(max-width:767px){

  /* 隐藏原生 stepper */
  #s2Stepper{display:none !important}

  /* 场景2：配件比主机小 */
  .t-host{width:min(560px,72%); top:38%}
  .theater.st1 .t-host,
  .theater.st2 .t-host{width:min(560px,60%); top:32%}
  .t-ifc{width:min(210px,26%); top:55%; bottom:auto}
  .t-arm{width:min(290px,50%); top:50%; bottom:auto}
  .t-final{width:min(560px,72%); top:46%}

  /* 场景2：容器比例对齐 viewBox */
  #sdk-electrical .theater{
    height:auto !important;
    aspect-ratio:1100 / 700 !important;
    min-height:0 !important;
  }

  /* 场景3：容器比例对齐 viewBox */
  html body #sdk-mechanical .guide-stage{
    width:100% !important;
    max-width:none !important;
    aspect-ratio:2560 / 1600 !important;
    height:auto !important;
    min-height:0 !important;
    padding:0 !important;
  }

  /* 场景3：卡片瘦身（只留编号 + 标题） */
  .guide-callout{width:clamp(80px,26vw,110px)}
  .guide-callout .txt-title{font-size:9px;line-height:1.25}
  .guide-callout .txt-desc{display:none}
  .glyph{width:16px;height:16px;font-size:9px;margin-bottom:3px}
}
@media(max-width:767px){
  /* 场景2 配件微调位置 */
  .t-ifc{top:46%;}      /* 55% → 46%，往上抬 9% */
  .t-arm{top:42%;}      /* 50% → 42%，也往上抬 */
  .t-final{top:44%;}    /* 46% → 44%，微抬 */
}
/* =====================================================================
 * S3 电气接入 · STEP 4 「主机 → 线 → 圆柱」轮流高亮
 * ===================================================================== */
.theater.st3 .final-zone.fz-0 .zone-fill,
.theater.st3 .final-zone.fz-0 .zone-flow{
  animation-delay:0s;      /* 主机先亮 */
}
.theater.st3 .final-line .zone-glow,
.theater.st3 .final-line .zone-flow{
  animation-delay:1.2s;    /* 线中间亮 */
}
.theater.st3 .final-zone.fz-1 .zone-fill,
.theater.st3 .final-zone.fz-1 .zone-flow{
  animation-delay:2.4s;      /* 圆柱最后亮 */
}
/* =====================================================================
 * 场景2 · 右下角灰字说明
 * ===================================================================== */
.mount-note{
  position: absolute;
  right: 2%;
  bottom: 3%;
  width: min(350px, 38%);
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: #8A8A8A;
  text-align: right;
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity .4s;
}
.theater.st2 .mount-note{ opacity:1; }   /* 只在 st2（STEP 3）显示 */
/* 移动端：字号更小，宽度更窄，靠内边距 */
@media(max-width:767px){
  .mount-note{
    right:4%;
    bottom:4%;
    width:min(260px, 60%);
    font-size:10.5px;
    line-height:1.4;
  }
  .theater.st2 .mount-note{ opacity:0; }
}
/* =====================================================================
 * 场景3 · guide-stage 下方右侧灰字说明
 * 宽度与 guide-stage 完全一致，右对齐到黑框右边缘
 * ===================================================================== */
.mount-note-s3{
  /* ★ 宽度 = guide-stage 宽度，自动跟随响应式断点 */
  width:min(100%, calc(64vh * 16 / 10), 1500px);
  margin:14px auto 0;
  padding:0;
  text-align:right;                  /* ★ 文字靠右 */
  font-size:12.5px;
  line-height:1.5;
  color:#8A8A8A;                     /* ★ 纯灰，无透明 */
  pointer-events:none;
}

/* 与 guide-stage 断点同步 */
@media(max-width:1200px){
  .mount-note-s3{width:min(100%, calc(64vh * 16 / 10), 1100px);}
}
@media(max-width:991px){
  .mount-note-s3{width:min(100%, 760px);}
}
@media(max-width:767px){
  .mount-note-s3{
    width:100%;
    padding:0 6%;
    margin-top:10px;
    font-size:10.5px;
    line-height:1.4;
  }
}