/* Homepage F — "product first" (2026-09-28). Loaded only on index pages; legal pages keep site.css.
   CSP: style-src 'self', img-src 'self' data:, script-src 'self' — no inline styles or scripts, no third-party fonts. */
:root{
  --f-ink:#050607;--f-ink-2:#0c0e10;--f-panel:#121518;--f-line:#252a2f;--f-line-2:#3a4047;
  --f-text:#f2f4ee;--f-muted:#a9aea3;--f-dim:#71766d;
  --f-lime:#b8fb35;--f-lime-soft:rgba(184,251,53,.14);--f-on-lime:#0b1004;--f-gold:#d7b36a;
  --f-sans:"Noto Sans TC","PingFang TC","Microsoft JhengHei","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Noto Sans",-apple-system,"Segoe UI",sans-serif;
  --f-poster:"HelveticaNeue-CondensedBlack","Helvetica Neue Condensed Black","Impact","Haettenschweiler","Arial Narrow Bold","Roboto Condensed","sans-serif-condensed",var(--f-sans);
  --f-mono:"SF Mono","Cascadia Mono",Consolas,ui-monospace,monospace;
  --f-pad:clamp(16px,4vw,40px);
}
html[data-site-page="index"]{background:var(--f-ink)}
html[data-site-page="index"] body{background:var(--f-ink);color:var(--f-text);font-family:var(--f-sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
html[data-site-page="index"] :focus-visible{outline:2px solid var(--f-lime);outline-offset:3px}

/* shared header and footer, restyled for the homepage */
html[data-site-page="index"] .top{position:sticky;top:0;z-index:30;background:rgba(5,6,7,.9);border-bottom:1px solid rgba(37,42,47,.8);backdrop-filter:blur(10px)}
html[data-site-page="index"] .top .wrap{width:auto;max-width:1260px;padding-inline:var(--f-pad)}
html[data-site-page="index"] .top-inner{min-height:68px}
html[data-site-page="index"] .brand img{width:120px}
html[data-site-page="index"] nav a{color:var(--f-muted);font-weight:600;font-size:13px}
html[data-site-page="index"] nav a:hover{color:var(--f-text)}
html[data-site-page="index"] nav a[aria-current=page]{color:var(--f-lime)}
html[data-site-page="index"] .languages summary{background:transparent;border-color:var(--f-line-2);color:var(--f-text)}
html[data-site-page="index"] footer{background:var(--f-ink);border-top:1px solid var(--f-line);color:var(--f-muted)}
html[data-site-page="index"] footer .wrap{width:auto;max-width:1260px;padding-inline:var(--f-pad)}
html[data-site-page="index"] footer a{color:var(--f-muted)}
html[data-site-page="index"] footer a:hover{color:var(--f-text)}
html[data-site-page="index"] .draft .wrap{width:auto;padding-inline:var(--f-pad)}

.f-wrap{max-width:1260px;margin-inline:auto;padding-inline:var(--f-pad)}
.f-eyebrow{display:block;font:600 12px/1.4 var(--f-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--f-lime)}
.f-sec h2,.f-hero h1,.f-close h2{margin:0;text-wrap:balance}
.f-sec em,.f-hero h1 em,.f-close h2 em{font-style:normal;color:var(--f-lime)}

/* hero */
.f-hero{position:relative;overflow:hidden;padding-block:clamp(36px,6vw,80px) clamp(48px,7vw,96px)}
.f-hero::before{content:"";position:absolute;inset:-20% -10% auto 40%;height:120%;background:radial-gradient(closest-side,rgba(184,251,53,.13),transparent 70%);pointer-events:none}
.f-word{position:absolute;right:-2vw;bottom:-4vw;margin:0;font:900 clamp(140px,25vw,380px)/.8 var(--f-poster);text-transform:uppercase;color:transparent;-webkit-text-stroke:1.5px rgba(184,251,53,.13);pointer-events:none;user-select:none}
.f-hero-grid{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(32px,5vw,72px);align-items:center}
.f-hero-logo{display:block;width:clamp(170px,19vw,250px);height:auto;margin-bottom:20px}
.f-hero h1{margin-top:12px;font-weight:900;font-size:clamp(42px,6.2vw,84px);line-height:1.06;letter-spacing:-.01em}
.f-lede{margin:20px 0 0;max-width:34em;color:var(--f-muted);font-size:clamp(16px,1.6vw,18px);line-height:1.7}
.f-cta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px;margin-top:30px}
.f-btn{display:inline-flex;align-items:center;height:50px;padding:0 24px;border-radius:12px;background:var(--f-lime);color:var(--f-on-lime);font-weight:800;text-decoration:none}
.f-btn:hover{background:#cdff6a;color:var(--f-on-lime)}
.f-status{display:inline-flex;align-items:center;gap:8px;color:var(--f-muted);font-size:14px}
.f-status i{width:8px;height:8px;border-radius:50%;background:var(--f-lime);box-shadow:0 0 0 4px var(--f-lime-soft)}
.f-stores{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.f-store{display:inline-flex;flex-direction:column;justify-content:center;height:58px;padding:0 22px;border-radius:14px;background:var(--f-text);color:var(--f-on-lime);font:800 19px/1.1 var(--f-sans);text-decoration:none}
.f-store small{font-size:11px;font-weight:500;opacity:.7}
.f-store:hover{background:var(--f-lime);color:var(--f-on-lime)}

/* phone + live logger */
.f-phone{position:relative;width:min(340px,100%);max-width:100%;aspect-ratio:340/700;margin-inline:auto;padding:12px;border-radius:46px;background:linear-gradient(160deg,#2a2e33,#0d0f11 40%,#1c1f23);box-shadow:0 0 0 1px #34383e,0 40px 90px rgba(0,0,0,.6),0 0 80px rgba(184,251,53,.09)}
.f-phone.small{width:min(300px,100%)}
.f-screen{position:relative;height:100%;overflow:hidden;border-radius:36px;background:#000}
.f-screen::before{content:"";position:absolute;top:10px;left:50%;z-index:3;width:92px;height:26px;border-radius:14px;background:#000;transform:translateX(-50%)}
.f-screen img{display:block;width:100%;height:100%;object-fit:cover;object-position:top}
.f-app{display:flex;flex-direction:column;height:100%;padding:48px 16px 16px;font-size:13px}
.f-app-top{display:flex;justify-content:space-between;color:var(--f-muted);font:600 10px/1.4 var(--f-mono);letter-spacing:.08em}
.f-app-top b{color:var(--f-lime);font-weight:600}
.f-app-title{margin:10px 0 0;font-size:24px;font-weight:900}
.f-sets{display:grid;gap:8px;margin-top:14px}
.f-set{display:grid;grid-template-columns:24px 1fr 1fr 1fr 34px;align-items:center;gap:6px;padding:9px 10px;border:1px solid #1f2226;border-radius:12px;background:#111316;font-family:var(--f-mono);font-variant-numeric:tabular-nums;transition:background .25s,border-color .25s}
.f-set.head{padding:0 10px;border:0;background:none;color:var(--f-dim);font-size:10px;letter-spacing:.06em}
.f-set .k{color:var(--f-dim)}
.f-set b{font-size:15px;font-weight:600}
.f-set button{width:30px;height:30px;border:1.5px solid #3a3f45;border-radius:9px;background:transparent;color:transparent;font-weight:900;cursor:pointer}
.f-set.next{border-color:#4a5057}
.f-set.done{border-color:rgba(184,251,53,.45);background:rgba(184,251,53,.08)}
.f-set.done button{border-color:var(--f-lime);background:var(--f-lime);color:var(--f-on-lime)}
.f-rest{margin-top:auto;padding:14px;border:1px solid #1f2226;border-radius:16px;background:#0f1113}
.f-rest-row{display:flex;justify-content:space-between;gap:8px;color:var(--f-muted);font-size:11px}
.f-rest strong{display:block;margin-top:4px;font:900 44px/1 var(--f-poster);font-variant-numeric:tabular-nums}
.f-bar{height:5px;margin-top:10px;overflow:hidden;border-radius:3px;background:#1d2024}
.f-bar i{display:block;width:0;height:100%;background:var(--f-lime);transition:width .9s linear}
.f-pr{display:flex;justify-content:space-between;gap:8px;margin-top:10px;color:var(--f-muted);font-size:11px}
.f-pr b{color:var(--f-gold);font-weight:600}
.f-big{height:46px;margin-top:10px;border:0;border-radius:12px;background:var(--f-lime);color:var(--f-on-lime);font:900 15px var(--f-sans);cursor:pointer}
.f-cap{margin:14px 0 0;text-align:center;color:var(--f-dim);font-size:12px}

/* facts + band */
.f-facts{border-block:1px solid var(--f-line);background:var(--f-ink-2)}
.f-facts-grid{display:grid;grid-template-columns:repeat(3,1fr)}
.f-fact{display:flex;align-items:baseline;gap:12px;padding:24px 20px;border-left:1px solid var(--f-line)}
.f-fact:first-child{border-left:0;padding-left:0}
.f-fact strong{font:900 clamp(40px,5vw,62px)/1 var(--f-poster);color:var(--f-text);font-variant-numeric:tabular-nums}
.f-fact span{color:var(--f-muted);font-size:14px}
.f-band-wrap{overflow:hidden;padding-block:26px}
.f-band{transform:rotate(-1.4deg);background:var(--f-lime);color:var(--f-on-lime)}
.f-band div{display:flex;width:max-content;animation:f-slide 40s linear infinite;font:900 26px/1 var(--f-poster);text-transform:uppercase;letter-spacing:.04em}
.f-band b{padding:12px 16px;font-weight:900;white-space:nowrap}
@keyframes f-slide{to{transform:translateX(-50%)}}

/* sections */
.f-sec{padding-block:clamp(64px,9vw,120px)}
.f-sec + .f-sec{padding-top:0}
.f-head{display:grid;gap:14px;max-width:780px}
.f-head h2{font-weight:900;font-size:clamp(32px,4.4vw,56px);line-height:1.1}
.f-head p{margin:0;color:var(--f-muted);font-size:17px;line-height:1.7;max-width:36em}

.f-flow{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,6vw,90px);align-items:center;margin-top:48px}
.f-steps{display:grid;gap:14px;margin:0;padding:0;list-style:none;counter-reset:f-step}
.f-steps li{display:grid;grid-template-columns:52px 1fr;column-gap:16px;padding:20px;border:1px solid var(--f-line);border-radius:16px;background:var(--f-panel)}
.f-steps li::before{grid-row:span 3;counter-increment:f-step;content:counter(f-step);font:900 40px/1 var(--f-poster);color:var(--f-lime)}
.f-steps h3{margin:0;font-size:20px}
.f-steps p{margin:4px 0 0;color:var(--f-muted);font-size:15px;line-height:1.65}
.f-steps span{margin-top:8px;color:var(--f-gold);font:600 12px/1.4 var(--f-mono)}
.f-shot{margin:0}
.f-shot figcaption{margin-top:14px;text-align:center;color:var(--f-dim);font-size:12px}

.f-progress{display:grid;grid-template-columns:1.25fr .75fr;gap:24px;margin-top:48px}
.f-card{padding:24px;border:1px solid var(--f-line);border-radius:20px;background:var(--f-panel)}
.f-card-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px}
.f-card h3{margin:0;font-size:17px}
.f-val{display:block;margin-top:6px;font:900 50px/1 var(--f-poster);font-variant-numeric:tabular-nums}
.f-val small,.f-mini small{margin-left:6px;font:500 16px var(--f-sans);color:var(--f-muted)}
.f-delta{color:var(--f-lime);font:600 13px/1.6 var(--f-mono)}
.f-seg{display:inline-flex;align-self:flex-start;padding:4px;border:1px solid var(--f-line);border-radius:10px;background:var(--f-ink-2)}
.f-seg button{padding:6px 12px;border:0;border-radius:7px;background:none;color:var(--f-muted);font:600 13px var(--f-sans);cursor:pointer}
.f-seg button[aria-pressed="true"]{background:var(--f-text);color:var(--f-ink)}
.f-chart{display:block;width:100%;height:auto;margin-top:18px}
.f-grid{stroke:var(--f-line);stroke-width:1}
.f-tick{fill:var(--f-dim);font:11px var(--f-mono)}
.f-stop-a{stop-color:var(--f-lime);stop-opacity:.3}
.f-stop-b{stop-color:var(--f-lime);stop-opacity:0}
.f-area{fill:url(#f-area)}
.f-line{fill:none;stroke:var(--f-lime);stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}
.f-dot{fill:var(--f-panel);stroke:var(--f-lime);stroke-width:2}
.f-dot.last{fill:var(--f-lime)}
.f-end{fill:var(--f-text);font:600 12px var(--f-mono)}
.f-side{display:grid;gap:16px;align-content:start}
.f-mini{padding:20px;border:1px solid var(--f-line);border-radius:18px;background:var(--f-ink-2)}
.f-mini span{color:var(--f-muted);font-size:13px}
.f-mini strong{display:block;font:900 40px/1.15 var(--f-poster);font-variant-numeric:tabular-nums}
.f-heat{display:grid;grid-template-columns:repeat(12,1fr);grid-template-rows:repeat(7,1fr);grid-auto-flow:column;gap:3px;margin-top:12px}
.f-heat i{aspect-ratio:1;border-radius:3px;background:#1b1e22}
.f-heat .l1{background:rgba(184,251,53,.28)}.f-heat .l2{background:rgba(184,251,53,.58)}.f-heat .l3{background:var(--f-lime)}
.f-sample{margin:0;color:var(--f-dim);font-size:12px}

.f-modes{margin-top:40px}
.f-tabs{display:flex;flex-wrap:wrap;gap:8px}
.f-tabs button{height:44px;padding:0 20px;border:1px solid var(--f-line);border-radius:999px;background:none;color:var(--f-muted);font:700 15px var(--f-sans);cursor:pointer}
.f-tabs button[aria-selected="true"]{border-color:var(--f-lime);background:var(--f-lime);color:var(--f-on-lime)}
.f-mode{display:grid;grid-template-columns:minmax(200px,auto) 1fr;gap:clamp(24px,5vw,64px);align-items:center;margin-top:20px;padding:clamp(24px,4vw,44px);border:1px solid var(--f-line);border-radius:24px;background:radial-gradient(120% 140% at 0 0,rgba(184,251,53,.07),transparent 55%),var(--f-panel)}
.f-mode[hidden]{display:none}
.f-mode-num strong{display:block;font:900 clamp(92px,13vw,170px)/.85 var(--f-poster);color:var(--f-lime);font-variant-numeric:tabular-nums}
.f-mode-num span{display:block;margin-top:10px;color:var(--f-muted);font:600 12px/1.5 var(--f-mono);letter-spacing:.1em}
.f-mode h3{margin:0;font-size:clamp(24px,2.8vw,32px);font-weight:900}
.f-mode p{margin:10px 0 0;max-width:36em;color:var(--f-muted);font-size:16px;line-height:1.7}
.f-chips{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.f-chips li{padding:6px 12px;border:1px solid var(--f-line);border-radius:8px;background:var(--f-ink-2);font-size:14px}

.f-trust{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:40px 0 0;padding:0;list-style:none}
.f-trust li{padding:26px;border:1px solid var(--f-line);border-radius:18px;background:var(--f-ink-2)}
.f-trust li::before{content:"";display:block;width:28px;height:3px;margin-bottom:18px;border-radius:2px;background:var(--f-lime)}
.f-trust h3{margin:0;font-size:19px}
.f-trust p{margin:6px 0 0;color:var(--f-muted);font-size:15px;line-height:1.65}

.f-close{padding:clamp(72px,10vw,130px) var(--f-pad);border-top:1px solid var(--f-line);background:radial-gradient(60% 80% at 50% 100%,rgba(184,251,53,.12),transparent 70%),var(--f-ink);text-align:center}
.f-close-logo{display:block;width:clamp(180px,20vw,260px);height:auto;margin:0 auto 22px}
.f-close h2{font:900 clamp(52px,9vw,128px)/.9 var(--f-poster);text-transform:uppercase;letter-spacing:.01em}
.f-close .f-cta,.f-close .f-stores{justify-content:center}
.f-policy-note{max-width:40em;margin:22px auto 0;color:var(--f-dim);font-size:12px}

@media (max-width:900px){
  .f-hero-grid,.f-flow,.f-progress{grid-template-columns:1fr}
  .f-trust{grid-template-columns:1fr}
}
@media (max-width:640px){
  html[data-site-page="index"] .brand img{width:104px}
  .f-facts-grid{grid-template-columns:1fr}
  .f-fact{padding-inline:0;border-left:0;border-top:1px solid var(--f-line)}
  .f-fact:first-child{border-top:0}
  .f-mode{grid-template-columns:1fr}
  .f-steps li{grid-template-columns:40px 1fr;padding:16px}
  .f-btn{width:100%;justify-content:center}
  .f-store{flex:1 1 100%;align-items:center}
}
@media (prefers-reduced-motion:reduce){.f-band div{animation:none}.f-set,.f-bar i{transition:none}}