@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Manrope:wght@400;500;600;700;800&display=swap');

:root {
  --bg:#09111d; --surface:#101c2b; --surface-2:#0d1724; --text:#f2f6fc;
  --muted:#9cabc0; --line:rgba(171,194,223,.14); --accent:#8b7cff;
  --cyan:#38d8e8; --green:#45dcaa; --shadow:0 20px 60px rgba(0,0,0,.22);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--text);font-family:"DM Sans",Arial,sans-serif;line-height:1.65}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{color:inherit}
.container{width:min(1160px,calc(100% - 44px));margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:10px;background:#fff;color:#111;padding:10px;z-index:99}
.skip-link:focus{left:10px}
.site-header{position:sticky;top:0;z-index:30;background:rgba(9,17,29,.88);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.header-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:25px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.04em;white-space:nowrap}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--accent),var(--cyan));color:#07111d;font-size:20px}
.brand-light{font-weight:500;color:var(--muted)}
.main-nav{display:flex;align-items:center;gap:28px;color:#c2cede;font-size:14px}
.main-nav a:hover,.footer-inner>a:last-child:hover{color:var(--cyan)}
.theme-toggle,.menu-toggle{border:1px solid var(--line);background:var(--surface);border-radius:12px;width:40px;height:40px;cursor:pointer}
.menu-toggle{display:none}
.hero{padding:85px 0 35px;overflow:hidden;background:radial-gradient(ellipse at 77% 28%,rgba(80,84,200,.19),transparent 36%),radial-gradient(ellipse at 17% 80%,rgba(31,181,194,.10),transparent 30%)}
.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;align-items:center;gap:50px;min-height:460px}
.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:800;color:var(--cyan);margin:0 0 14px}
.pulse{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);margin-right:8px;box-shadow:0 0 13px var(--green)}
h1,h2,h3,p{margin-top:0}
h1,h2{font-family:Manrope,"DM Sans",sans-serif;letter-spacing:-.055em;line-height:1.12}
h1{font-size:clamp(42px,5.1vw,68px);margin:0 0 22px}
.gradient-text{background:linear-gradient(90deg,#a394ff,#48dbe5);background-clip:text;color:transparent}
.hero-lead{font-size:18px;color:#bac7d8;max-width:590px}
.hero-actions{display:flex;gap:13px;flex-wrap:wrap;margin:29px 0 24px}
.button{display:inline-flex;justify-content:center;align-items:center;gap:13px;border:0;border-radius:12px;padding:13px 19px;font-weight:700;cursor:pointer;transition:.2s}
.button:hover{transform:translateY(-2px)}
.button-primary{background:linear-gradient(110deg,#8775ff,#38cbdc);color:#06111c;box-shadow:0 8px 26px rgba(89,135,235,.2)}
.button-quiet{border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--text)}
.hero-note{font-size:13px;color:var(--muted)}.note-icon{color:var(--cyan);margin-right:6px}
.hero-visual{height:400px;position:relative;display:grid;place-items:center}
.orbit{position:absolute;border:1px solid rgba(131,142,255,.18);border-radius:50%;transform:rotate(-20deg)}
.orbit-one{width:440px;height:230px}.orbit-two{width:360px;height:310px;transform:rotate(34deg)}
.usb-chip{position:relative;width:225px;height:270px;border:1px solid rgba(138,171,219,.35);border-radius:25px;background:linear-gradient(145deg,rgba(36,53,80,.92),rgba(12,22,37,.95));box-shadow:0 25px 70px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.1);display:flex;flex-direction:column;align-items:center;justify-content:center}
.chip-label,.chip-caption{font-size:9px;letter-spacing:.16em;color:#91a8c8}.usb-symbol{font-size:92px;line-height:1.3;font-weight:800;background:linear-gradient(140deg,#c6adff,#31d9e5);background-clip:text;color:transparent}.chip-name{font-size:31px;font-weight:800;letter-spacing:.1em}.chip-caption{margin-top:9px}
.float-tag{position:absolute;border:1px solid rgba(163,182,216,.2);background:rgba(18,31,49,.88);padding:10px 14px;border-radius:12px;font-size:12px;box-shadow:var(--shadow)}
.float-tag span{color:var(--cyan);font-size:18px;margin-right:6px}.tag-speed{top:59px;left:2%}.tag-power{right:0;bottom:75px}.visual-caption{position:absolute;bottom:11px;color:#94a6be;font-size:12px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);margin-top:35px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);gap:20px}
.hero-stats div{display:flex;flex-direction:column;gap:5px}.hero-stats strong{font-size:19px;letter-spacing:-.03em}.hero-stats span{font-size:12px;color:var(--muted)}
.section{padding:92px 0}.section-alt{background:var(--surface-2)}
.section-heading{max-width:690px;margin:0 0 39px}.section-heading h2,.calculator-copy h2,.checklist-layout h2,.quiz-layout h2{font-size:clamp(32px,4vw,45px);margin:0 0 13px}
.section-heading>p:last-child,.checklist-layout>div>p:last-child,.quiz-layout>div>p:last-child{color:var(--muted);font-size:16px;margin-bottom:0}
.three-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.info-card,.life-card,.connector-card{border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,rgba(20,34,52,.92),rgba(13,24,39,.96));padding:25px;transition:transform .2s,border-color .2s}
.info-card:hover,.life-card:hover,.connector-card:hover{transform:translateY(-4px);border-color:rgba(76,207,223,.38)}
.card-icon{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;font-size:23px;margin-bottom:21px}
.icon-purple{background:rgba(139,124,255,.16);color:#aa9eff}.icon-blue{background:rgba(56,216,232,.13);color:var(--cyan)}.icon-green{background:rgba(69,220,170,.13);color:var(--green)}
.card-kicker{font-size:10px;letter-spacing:.15em;color:var(--muted);margin-bottom:6px}
.info-card h3,.life-card h3,.connector-card h3{font-size:19px;margin-bottom:10px;letter-spacing:-.03em}
.info-card>p:not(.card-kicker),.life-card p,.connector-card p{color:#aebbd0;font-size:14px;line-height:1.7}
.card-bottom{display:block;border-top:1px solid var(--line);padding-top:14px;margin-top:16px;color:#d2dcee;font-size:12px}
.callout{display:flex;gap:14px;align-items:flex-start;border:1px solid rgba(56,216,232,.2);background:rgba(56,216,232,.055);padding:17px 20px;border-radius:14px;margin-top:20px}
.callout-icon{font-size:20px}.callout p{margin:0;color:#c6d2e1;font-size:14px}
.heading-row{display:flex;align-items:end;justify-content:space-between;gap:25px;max-width:none}
.heading-row>div{max-width:660px}
.search-box{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:var(--surface);border-radius:11px;padding:9px 12px;color:var(--cyan);min-width:220px}
.search-box input{width:100%;border:0;outline:0;background:transparent;color:var(--text);font-size:13px}.search-box input::placeholder{color:#7e8da3}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:15px}
.standards-table{border-collapse:collapse;width:100%;min-width:790px;text-align:left;background:rgba(12,23,37,.66)}
.standards-table th{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#9aabc1;background:rgba(255,255,255,.025);padding:15px 18px}
.standards-table td{padding:16px 18px;border-top:1px solid var(--line);font-size:13px;color:#c5d0df}
.standards-table td:nth-child(2){font-weight:700;color:#f0f4fa;white-space:nowrap}
.standard-pill{display:inline-block;font-size:11px;font-weight:700;padding:5px 9px;border-radius:7px;white-space:nowrap}
.pill-old{background:rgba(137,150,168,.14);color:#b1becd}.pill-basic{background:rgba(76,163,255,.14);color:#78b8ff}.pill-fast{background:rgba(59,215,194,.13);color:#5fdec9}.pill-faster{background:rgba(99,213,147,.13);color:#80e8a6}.pill-pro{background:rgba(152,123,255,.15);color:#b6a5ff}.pill-new{background:rgba(242,167,89,.14);color:#ffbd78}
.table-note{font-size:12px;color:#8999af;margin:13px 2px 0}
.calculator-grid{display:grid;grid-template-columns:1fr .85fr;gap:70px;align-items:center}
.calculator-copy>p:not(.eyebrow){color:var(--muted);max-width:510px}
.calc-tip{display:flex;gap:12px;margin-top:25px;color:var(--cyan);border-left:2px solid var(--cyan);padding:5px 0 5px 13px}
.calc-tip p{font-size:13px;color:#aebbd0;margin:0}
.calculator-card{padding:27px;border:1px solid var(--line);background:linear-gradient(145deg,#14243a,#0e1929);border-radius:18px;box-shadow:var(--shadow)}
.calculator-card>label{display:block;font-size:12px;color:#bdc9d9;margin:14px 0 7px}
.calculator-card>label:first-child{margin-top:0}
.input-row{display:flex;gap:8px}.calculator-card input[type=number],.calculator-card select{width:100%;border:1px solid var(--line);background:#0a1421;color:var(--text);border-radius:9px;padding:11px 12px;outline:none}
.input-row select{max-width:95px}.calculator-card select option{background:#0a1421}
.calculator-card input[type=range]{width:100%;accent-color:#58cfdf}
.calc-button{width:100%;margin-top:17px}
.calc-result{margin-top:18px;background:rgba(56,216,232,.07);border:1px solid rgba(56,216,232,.18);border-radius:12px;padding:16px;display:flex;flex-direction:column}
.calc-result span,.calc-result small{font-size:12px;color:#aab9cc}.calc-result strong{font-size:30px;letter-spacing:-.04em;margin:2px 0 4px;color:#85e8ed}
.life-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}
.life-card{padding:22px}.life-icon{display:inline-grid;place-items:center;width:43px;height:43px;border-radius:13px;background:rgba(255,255,255,.055);font-size:21px;margin-bottom:15px}
.life-card p{min-height:95px;margin-bottom:17px}
.life-label{display:inline-block;font-size:9px;letter-spacing:.09em;font-weight:800;padding:5px 8px;border-radius:6px}
.label-calm{color:#9aabc0;background:rgba(137,150,168,.12)}.label-mid{color:#7ccedf;background:rgba(56,216,232,.09)}.label-fast{color:#73e2ae;background:rgba(69,220,170,.10)}
.connector-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.connector-card{text-align:center;padding:22px 18px}
.connector-card p{font-size:13px;min-height:108px}
.connector-card small{color:#8fa0b7;font-size:11px}
.connector-drawing{height:86px;display:grid;place-items:center;margin-bottom:12px}
.connector-drawing span{display:block;position:relative}
.drawing-a span{width:63px;height:34px;border:5px solid #a8bad1;border-radius:5px;background:#17263a}
.drawing-a span:after{content:"";position:absolute;width:21px;height:5px;background:#51d5df;top:8px;left:16px}
.drawing-c span{width:60px;height:31px;border:5px solid #a8bad1;border-radius:50%;background:#17263a}
.drawing-c span:after{content:"";position:absolute;height:5px;width:21px;background:#51d5df;top:8px;left:14px;border-radius:5px}
.drawing-b span{width:45px;height:39px;border:5px solid #a8bad1;border-radius:5px;background:#17263a;clip-path:polygon(0 0,100% 0,100% 74%,84% 100%,16% 100%,0 74%)}
.drawing-micro span{width:49px;height:24px;border:5px solid #a8bad1;border-radius:4px;background:#17263a;clip-path:polygon(0 0,100% 0,91% 100%,9% 100%)}
.warning-box{margin-top:18px;border:1px solid rgba(245,183,94,.2);background:rgba(245,183,94,.055);padding:16px 19px;border-radius:12px;font-size:13px;color:#bec9d7}
.section-dark{background:linear-gradient(120deg,#111d2e,#10182a)}
.chain{display:flex;align-items:center;justify-content:space-between;gap:13px}
.chain> b{color:#6f83a1;font-size:20px}
.chain-item{flex:1;min-height:130px;border:1px solid var(--line);border-radius:14px;padding:17px;background:rgba(255,255,255,.025);display:flex;flex-direction:column}
.chain-item>span{color:var(--cyan);font-size:11px;font-weight:800;margin-bottom:17px}
.chain-item strong{font-size:14px}.chain-item small{color:var(--muted);font-size:11px;margin-top:6px}
.rule-banner{display:flex;gap:17px;align-items:center;padding:17px 20px;border:1px solid rgba(139,124,255,.24);background:rgba(139,124,255,.07);border-radius:14px;margin-top:20px}
.rule-symbol{font-size:31px;color:#b3a4ff}.rule-banner p{margin:0;color:#c2ccdc;font-size:14px}
.checklist-layout,.quiz-layout,.faq-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:75px;align-items:start}
.checklist{list-style:none;margin:0;padding:0}
.checklist li{display:flex;gap:15px;padding:0 0 22px;margin-bottom:20px;border-bottom:1px solid var(--line)}
.checklist li>span{flex:0 0 34px;height:34px;border:1px solid rgba(56,216,232,.35);color:var(--cyan);border-radius:10px;display:grid;place-items:center;font-size:13px;font-weight:800}
.checklist strong{font-size:15px}.checklist p{color:var(--muted);font-size:13px;margin:5px 0 0}
.quiz-card{border:1px solid var(--line);background:var(--surface);border-radius:17px;padding:23px}
.quiz-question{font-weight:700;font-size:18px;margin-bottom:17px}
.quiz-options{display:grid;gap:9px}
.quiz-options button{text-align:left;background:rgba(255,255,255,.035);border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer;font-size:13px}
.quiz-options button:hover{border-color:var(--cyan)}
.quiz-options button.correct{border-color:var(--green);background:rgba(69,220,170,.1)}
.quiz-options button.incorrect{border-color:#ff778b;background:rgba(255,119,139,.09)}
.quiz-feedback{font-size:12px;color:var(--muted);margin:14px 0 0}
.faq-layout{grid-template-columns:.65fr 1.35fr}
.faq-list details{border-bottom:1px solid var(--line);padding:17px 0}
.faq-list summary{cursor:pointer;list-style:none;font-weight:700;font-size:15px;display:flex;justify-content:space-between;gap:15px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:after{content:"+";color:var(--cyan);font-size:20px;font-weight:400}
.faq-list details[open] summary:after{content:"−"}
.faq-list details p{font-size:13px;color:var(--muted);margin:12px 28px 0 0}
.sources-strip{background:#0c1724;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0}
.sources-inner{display:flex;align-items:center;gap:24px}
.sources-inner>div{flex:1}.sources-inner .eyebrow{font-size:9px}.sources-inner p{font-size:12px;color:var(--muted);margin:0}
.sources-inner>a{border:1px solid var(--line);border-radius:9px;padding:10px 13px;font-size:12px}
.sources-inner>a span{color:var(--cyan)}
.site-footer{padding:25px 0}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px}
.footer-inner p{margin:0;color:var(--muted);font-size:12px}.footer-inner>a:last-child{font-size:12px;color:#c4d0df}
body.light-theme{--bg:#f3f6fb;--surface:#fff;--surface-2:#eaf0f7;--text:#172336;--muted:#5c6c81;--line:rgba(30,55,85,.15);--shadow:0 15px 40px rgba(15,35,60,.1)}
body.light-theme .site-header{background:rgba(243,246,251,.9)}
body.light-theme .hero{background:radial-gradient(ellipse at 77% 28%,rgba(115,102,255,.12),transparent 36%),#f3f6fb}
body.light-theme .info-card,body.light-theme .life-card,body.light-theme .connector-card,body.light-theme .calculator-card,body.light-theme .quiz-card{background:#fff}
body.light-theme .standards-table,body.light-theme .calculator-card input[type=number],body.light-theme .calculator-card select{background:#fff;color:var(--text)}
body.light-theme .main-nav{color:#35445a}
body.light-theme .hero-lead,body.light-theme .info-card>p:not(.card-kicker),body.light-theme .life-card p,body.light-theme .connector-card p{color:#52637a}
body.light-theme .card-bottom{color:#35445a}
@media(max-width:900px){
  .main-nav{gap:15px;font-size:12px}.hero-grid{gap:15px}.hero-stats{grid-template-columns:repeat(2,1fr)}
  .calculator-grid,.checklist-layout,.quiz-layout,.faq-layout{gap:35px}
  .connector-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .container{width:min(100% - 30px,540px)}
  .header-inner{height:66px}.menu-toggle{display:block;margin-left:auto}
  .main-nav{display:none;position:absolute;top:65px;left:0;right:0;padding:15px 20px 20px;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch}
  .main-nav.open{display:flex}.main-nav a{padding:9px 0;font-size:14px}
  .hero{padding-top:52px}.hero-grid{grid-template-columns:1fr}.hero-visual{height:320px}
  .usb-chip{width:180px;height:220px}.usb-symbol{font-size:73px}.orbit-one{width:320px}.orbit-two{width:300px}
  .hero-stats{gap:17px}.hero-stats strong{font-size:16px}.hero-stats span{font-size:11px}
  .section{padding:67px 0}.three-cards,.life-grid{grid-template-columns:1fr}
  .heading-row{align-items:stretch;flex-direction:column}.search-box{width:100%}
  .calculator-grid,.checklist-layout,.quiz-layout,.faq-layout{grid-template-columns:1fr;gap:28px}
  .life-card p,.connector-card p{min-height:0}
  .chain{display:grid;grid-template-columns:1fr 1fr}.chain>b{display:none}.chain-item{min-height:120px}
  .sources-inner{align-items:stretch;flex-wrap:wrap}.sources-inner>div{flex-basis:100%}
  .footer-inner{flex-wrap:wrap}.footer-inner p{order:3;flex-basis:100%}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}