/* Shared styles for every NextBox page (index.html = Windows, android.html = Android) */
:root {
  --accent: #f472b6;
  --accent-deep: oklch(from var(--accent) min(l, 0.6) c h);
  --accent-strong: var(--accent-deep);
  --accent-2: oklch(from var(--accent) l c calc(h - 70));
  --accent-soft: color-mix(in srgb, var(--accent) 14%, white);
  --bg: color-mix(in srgb, var(--accent) 3%, #fbfbfd);
  --bg-2: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --card: #ffffff;
  --border: rgba(28, 33, 56, 0.08);
  --border-2: rgba(28, 33, 56, 0.14);
  --text: #1a2133;
  --text-2: #586378;
  --text-3: #8a94a8;
  --good: #17a35a;
  --mid: #d99a06;
  --shadow-lg: 0 30px 80px -20px color-mix(in srgb, var(--accent-deep) 26%, transparent), 0 12px 30px -12px rgba(20, 30, 60, 0.18);
  --shadow: 0 1px 2px rgba(20, 30, 60, 0.05), 0 8px 24px -12px rgba(20, 30, 60, 0.12);
  --glow-1: color-mix(in srgb, var(--accent) 28%, transparent);
  --glow-2: color-mix(in srgb, var(--accent-2) 20%, transparent);
  --grid: rgba(28, 33, 56, 0.045);
  --font: 'Noto Sans SC', 'Microsoft YaHei UI', 'PingFang SC', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Cascadia Mono', Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent-soft: color-mix(in srgb, var(--accent) 20%, #161b29);
    --accent-strong: oklch(from var(--accent) max(l, 0.75) c h);
    --bg: #0d1019;
    --bg-2: #121623;
    --surface: rgba(20, 24, 38, 0.7);
    --card: #161b29;
    --border: rgba(255, 255, 255, 0.07);
    --border-2: rgba(255, 255, 255, 0.13);
    --text: #e8ecf5;
    --text-2: #a3adc2;
    --text-3: #6f7a90;
    --shadow-lg: 0 30px 80px -20px color-mix(in srgb, var(--accent) 22%, transparent), 0 12px 30px -12px rgba(0, 0, 0, 0.6);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
    --glow-1: color-mix(in srgb, var(--accent) 20%, transparent);
    --glow-2: color-mix(in srgb, var(--accent-2) 22%, transparent);
    --grid: rgba(255, 255, 255, 0.035);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --accent-soft: color-mix(in srgb, var(--accent) 20%, #161b29);
  --accent-strong: oklch(from var(--accent) max(l, 0.75) c h);
  --bg: #0d1019;
  --bg-2: #121623;
  --surface: rgba(20, 24, 38, 0.7);
  --card: #161b29;
  --border: rgba(255, 255, 255, 0.07);
  --border-2: rgba(255, 255, 255, 0.13);
  --text: #e8ecf5;
  --text-2: #a3adc2;
  --text-3: #6f7a90;
  --shadow-lg: 0 30px 80px -20px color-mix(in srgb, var(--accent) 22%, transparent), 0 12px 30px -12px rgba(0, 0, 0, 0.6);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  --glow-1: color-mix(in srgb, var(--accent) 20%, transparent);
  --glow-2: color-mix(in srgb, var(--accent-2) 22%, transparent);
  --grid: rgba(255, 255, 255, 0.035);
  color-scheme: dark;
}

/* fallback for browsers without relative colour syntax */
@supports not (color: oklch(from red l c h)) {
  :root { --accent-deep: color-mix(in srgb, var(--accent) 78%, black); --accent-2: #8b7bff; }
  :root[data-theme="dark"] { --accent-strong: var(--accent); }
}
@media (prefers-color-scheme: dark) {
  @supports not (color: oklch(from red l c h)) { :root:not([data-theme="light"]) { --accent-strong: var(--accent); } }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
code, .mono { font-family: var(--mono); }
::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }

.wrap { width: min(1180px, 100% - 32px); margin-inline: auto; }
.nav .wrap, .hero .wrap { width: min(1320px, 100% - 32px); }

/* ---------- background decoration */
.bg-deco { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg-deco::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}
.blob { position: absolute; border-radius: 50%; filter: blur(80px); }
.blob.b1 { width: 560px; height: 560px; background: var(--glow-1); top: -180px; left: -120px; animation: drift 18s ease-in-out infinite alternate; }
.blob.b2 { width: 520px; height: 520px; background: var(--glow-2); top: -80px; right: -160px; animation: drift 22s ease-in-out infinite alternate-reverse; }
@keyframes drift { to { transform: translate(60px, 40px) scale(1.08); } }

/* ---------- nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, background .2s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 19px; letter-spacing: -.01em; }
.brand img { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 4px; margin-left: 12px; }
.nav-links a { white-space: nowrap; padding: 6px 12px; border-radius: 8px; color: var(--text-2); font-size: 15px; font-weight: 500; transition: color .15s, background .15s; }
.nav-links a:hover { color: var(--text); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.icon-btn {
  display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-2); cursor: pointer;
  transition: color .15s, border-color .15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-2); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-sun { display: none; }
:root[data-theme="dark"] .theme-sun { display: block; }
:root[data-theme="dark"] .theme-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-sun { display: block; }
  :root:not([data-theme="light"]) .theme-moon { display: none; }
}

/* ---------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 48px; padding: 0 22px; border-radius: 12px; font-weight: 700; font-size: 16px;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap; font-family: inherit;
  transition: transform .15s, box-shadow .2s, background .2s, border-color .2s;
}
.btn svg { width: 19px; height: 19px; flex: none; }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 60%, var(--accent-2) 130%);
  box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--accent-deep) 70%, transparent), inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px -10px color-mix(in srgb, var(--accent-deep) 75%, transparent), inset 0 1px 0 rgba(255,255,255,.25); }
.btn-ghost { background: var(--surface); border-color: var(--border-2); color: var(--text); }
.btn-ghost:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border-2)); }
.btn-sm { height: 38px; padding: 0 14px; font-size: 14px; border-radius: 10px; }
.btn-sm svg { width: 16px; height: 16px; }

/* ---------- hero */
.hero { padding: 72px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 48px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px 5px 6px; border-radius: 999px;
  border: 1px solid var(--border-2); background: var(--surface); font-size: 13.5px; color: var(--text-2); font-weight: 500;
}
.pill b { background: var(--accent-strong); color: #fff; padding: 1px 9px; border-radius: 999px; font-size: 12px; font-weight: 700; }
:root[data-theme="dark"] .pill b { color: #1a0d14; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .pill b { color: #1a0d14; } }
.pill:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--border-2)); }
h1 {
  font-size: clamp(40px, 5vw, 60px); line-height: 1.08; letter-spacing: -.03em; margin: 22px 0 18px; font-weight: 900;
}
.grad {
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-strong) 40%, var(--accent-2) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: 18.5px; color: var(--text-2); max-width: 540px; margin: 0 0 32px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.cta-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 18px; color: var(--text-3); font-size: 14px; }
.cta-meta span { display: inline-flex; align-items: center; gap: 6px; }
.cta-meta svg { width: 15px; height: 15px; color: var(--good); }


/* ---------- protocol marquee */
.marquee { padding: 30px 0 10px; }
.marquee p { text-align: center; color: var(--text-3); font-size: 13.5px; margin: 0 0 16px; letter-spacing: .04em; }
.track-mask { overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.track { display: flex; width: max-content; animation: scroll var(--dur, 32s) linear infinite; }
.track .group { display: flex; flex: none; gap: 12px; padding-right: 12px; }
.track-mask:hover .track { animation-play-state: paused; }
.track span {
  padding: 9px 18px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface);
  font-weight: 700; color: var(--text-2); font-size: 15px; white-space: nowrap;
}
@keyframes scroll { to { transform: translateX(calc(-1 * var(--shift, 50%))); } }

/* ---------- sections */
section { padding: 96px 0; }
.sec-head { text-align: center; max-width: 680px; margin: 0 auto 52px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .14em; color: var(--accent-strong); text-transform: uppercase; margin-bottom: 12px; }
h2 { font-size: clamp(30px, 3.6vw, 44px); line-height: 1.2; letter-spacing: -.02em; margin: 0 0 14px; font-weight: 900; }
.sec-head p { color: var(--text-2); font-size: 17px; margin: 0; }

/* ---------- features bento */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.feat {
  grid-column: span 2; position: relative; padding: 26px; border-radius: 18px; background: var(--card);
  border: 1px solid var(--border); box-shadow: var(--shadow); overflow: hidden;
  transition: transform .25s, border-color .25s;
}
.feat:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.feat.wide { grid-column: span 3; }
.feat .fi {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 18px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 22%, transparent), color-mix(in srgb, var(--accent-2) 18%, transparent));
  color: var(--accent-strong);
}
.feat .fi svg { width: 22px; height: 22px; }
.feat h3 { margin: 0 0 8px; font-size: 19px; font-weight: 700; }
.feat p { margin: 0; color: var(--text-2); font-size: 15px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.tags span { font-size: 12.5px; padding: 3px 10px; border-radius: 6px; background: color-mix(in srgb, var(--text) 5%, transparent); color: var(--text-2); font-weight: 500; }
.feat .shine {
  position: absolute; right: -60px; top: -60px; width: 180px; height: 180px; border-radius: 50%;
  background: radial-gradient(circle, var(--glow-1), transparent 70%); opacity: 0; transition: opacity .3s;
}
.feat:hover .shine { opacity: 1; }

.feat .shine { pointer-events: none; }
.picker { position: relative; display: flex; align-items: center; flex-wrap: wrap; gap: 14px 18px; margin-top: 20px; }
.swatches { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.swatch {
  position: relative; width: 30px; height: 30px; padding: 0; border: none; border-radius: 50%; cursor: pointer;
  background: var(--c); box-shadow: inset 0 0 0 2px rgba(255,255,255,.3);
  outline: 2px solid transparent; outline-offset: 3px; transition: transform .15s, outline-color .15s;
}
.swatch:hover { transform: scale(1.1); }
.swatch.on { outline-color: var(--c); }
.swatch:focus-visible, .swatch.custom:focus-within { outline-color: var(--text); }
.swatch.custom { --c: var(--accent); overflow: hidden; background: conic-gradient(from 90deg, #f43f5e, #f59e0b, #22c55e, #14b8a6, #3b82f6, #8b5cf6, #f43f5e); }
.swatch.custom input { position: absolute; inset: -6px; width: calc(100% + 12px); height: calc(100% + 12px); padding: 0; border: 0; opacity: 0; cursor: pointer; }
.modes { margin-left: auto; display: flex; gap: 2px; padding: 3px; border-radius: 11px; background: color-mix(in srgb, var(--text) 6%, transparent); }
.modes button {
  display: flex; align-items: center; gap: 6px; padding: 6px 14px; border: none; border-radius: 8px; background: none; cursor: pointer;
  font: 500 14px var(--font); color: var(--text-2); transition: background .15s, color .15s;
}
.modes button svg { width: 15px; height: 15px; }
.modes button.on { background: var(--card); color: var(--text); font-weight: 700; box-shadow: var(--shadow); }
.tree {
  margin: 16px 0 0; padding: 14px 16px; border-radius: 10px; background: color-mix(in srgb, var(--text) 4%, transparent);
  font: 12.5px/1.7 var(--mono); color: var(--text-2); overflow-x: auto;
}
.tree span { color: var(--text-3); }

/* route mode mini visual */
.routes { display: flex; gap: 8px; margin-top: 16px; }
.routes div { flex: 1; padding: 10px; border-radius: 10px; border: 1px solid var(--border); font-size: 13px; text-align: center; color: var(--text-2); }
.routes div.on { border-color: color-mix(in srgb, var(--accent) 55%, transparent); background: color-mix(in srgb, var(--accent) 8%, transparent); color: var(--accent-strong); font-weight: 700; }

/* ---------- steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: s; }
.step { position: relative; padding: 26px 22px; border-radius: 16px; background: var(--surface); border: 1px solid var(--border); }
.step::before {
  counter-increment: s; content: "0" counter(s);
  font: 700 14px var(--mono); color: var(--accent-strong); display: inline-block; margin-bottom: 14px;
  padding: 3px 9px; border-radius: 7px; background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.step h3 { margin: 0 0 6px; font-size: 17.5px; }
.step p { margin: 0; color: var(--text-2); font-size: 14.5px; }
.step:not(:last-child)::after {
  content: ""; position: absolute; top: 40px; right: -13px; width: 10px; height: 10px;
  border-top: 2px solid var(--border-2); border-right: 2px solid var(--border-2); transform: rotate(45deg);
}

/* ---------- download */
.dl {
  position: relative; display: grid; grid-template-columns: 1.15fr 1fr; gap: 0; border-radius: 24px; overflow: hidden;
  background: var(--card); border: 1px solid var(--border-2); box-shadow: var(--shadow-lg);
}
.dl-main { padding: 44px; position: relative; min-width: 0; }
.dl-main::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: radial-gradient(600px 300px at 0% 0%, var(--glow-1), transparent 70%), radial-gradient(500px 300px at 100% 100%, var(--glow-2), transparent 70%);
}
.dl-main > * { position: relative; }
.dl-top { display: flex; align-items: center; gap: 16px; margin-bottom: 26px; }
.dl-top img { width: 64px; height: 64px; filter: drop-shadow(0 8px 16px rgba(219,39,119,.35)); }
.dl-top h3 { margin: 0; font-size: 26px; font-weight: 900; }
.dl-top .sub { color: var(--text-2); font-size: 14.5px; }
.file {
  display: flex; align-items: center; gap: 14px; padding: 16px; border-radius: 14px;
  border: 1px solid var(--border-2); background: var(--surface); margin-bottom: 18px;
}
.file .zip { width: 44px; height: 44px; border-radius: 11px; flex: none; display: grid; place-items: center; background: linear-gradient(135deg, #0ea5e9, #2563eb); color: #fff; }
.file .zip svg { width: 22px; height: 22px; }
.file > div:last-child { min-width: 0; }
.file .fn { font-family: var(--mono); font-size: 14px; font-weight: 500; word-break: break-all; }
.file .fm { color: var(--text-3); font-size: 13px; }
.dl-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.hash {
  margin-top: 22px; padding: 12px 14px; border-radius: 12px; background: color-mix(in srgb, var(--text) 4%, transparent);
  display: flex; align-items: center; gap: 10px; font-size: 12.5px;
}
.hash .lbl { font-weight: 700; color: var(--text-2); flex: none; }
.hash code { color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; }
.copy { flex: none; border: none; background: none; cursor: pointer; color: var(--text-3); padding: 4px; border-radius: 6px; display: grid; place-items: center; }
.copy:hover { color: var(--accent-strong); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.copy svg { width: 16px; height: 16px; }
.dl-side { padding: 44px; border-left: 1px solid var(--border); background: color-mix(in srgb, var(--bg) 55%, transparent); }
.dl-side h4 { margin: 0 0 14px; font-size: 15px; letter-spacing: .02em; }
.req { list-style: none; padding: 0; margin: 0 0 30px; display: grid; gap: 10px; }
.req li { display: flex; gap: 10px; align-items: flex-start; color: var(--text-2); font-size: 14.5px; }
.req svg { width: 18px; height: 18px; color: var(--good); flex: none; margin-top: 3px; }
.install { margin: 0; padding: 0; list-style: none; counter-reset: i; display: grid; gap: 14px; }
.install li { position: relative; padding-left: 36px; color: var(--text-2); font-size: 14.5px; }
.install li::before {
  counter-increment: i; content: counter(i); position: absolute; left: 0; top: 1px; width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center; font: 700 12.5px var(--mono); background: var(--accent-soft); color: var(--accent-strong);
}
.install b { color: var(--text); }
kbd { font-family: var(--mono); font-size: 12.5px; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border-2); background: var(--card); }

/* ---------- core */
.core-specs { max-width: 860px; margin-inline: auto; }
.specs { border-radius: 18px; border: 1px solid var(--border); background: var(--card); overflow: hidden; box-shadow: var(--shadow); }
.spec { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 16px 22px; border-bottom: 1px solid var(--border); font-size: 14.5px; }
.spec:last-child { border-bottom: none; }
.spec dt { color: var(--text-3); }
.spec dd { margin: 0; font-weight: 500; }
.spec dd .tags { margin-top: 0; }
.spec dd .tags span { font-family: var(--mono); font-size: 11.5px; }

/* ---------- faq */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
details {
  border-radius: 14px; border: 1px solid var(--border); background: var(--card); transition: border-color .2s;
}
details[open] { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
summary {
  list-style: none; cursor: pointer; padding: 18px 22px; font-weight: 700; font-size: 16.5px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary .chev { width: 18px; height: 18px; flex: none; color: var(--text-3); transition: transform .25s; }
details[open] summary .chev { transform: rotate(45deg); color: var(--accent-strong); }
details .ans { padding: 0 22px 20px; color: var(--text-2); font-size: 15px; }
details .ans p { margin: 0 0 8px; }
details .ans p:last-child { margin: 0; }

/* ---------- final cta */
.final {
  text-align: center; padding: 72px 32px; border-radius: 28px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep) 45%, var(--accent-2));
  color: #fff;
}
.final::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,.18) 1px, transparent 1px); background-size: 22px 22px;
  mask-image: radial-gradient(ellipse at center, #000, transparent 70%);
}
.final > * { position: relative; }
.final img { width: 72px; height: 72px; margin: 0 auto 18px; filter: brightness(0) invert(1) drop-shadow(0 6px 18px rgba(0,0,0,.2)); }
.final h2 { color: #fff; }
.final p { color: rgba(255,255,255,.88); margin: 0 0 30px; font-size: 17px; }
.final .btn-primary { background: #fff; color: var(--accent-deep); box-shadow: 0 14px 34px -12px rgba(0,0,0,.4); }
.final .btn-ghost { background: rgba(255,255,255,.12); color: #fff; border-color: rgba(255,255,255,.35); }

/* ---------- footer */
footer { padding: 48px 0 40px; border-top: 1px solid var(--border); margin-top: 96px; color: var(--text-3); font-size: 14px; }
footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
footer h5 { margin: 0 0 12px; color: var(--text); font-size: 14.5px; }
footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
footer a:hover { color: var(--accent-strong); }
footer .note { margin-top: 14px; font-size: 13px; line-height: 1.7; }
.copyright { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid var(--border); font-size: 13px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ---------- i18n */
html[lang="en"] h1 { font-size: clamp(36px, 4vw, 50px); }
html.i18n-pending body { visibility: hidden; animation: i18n-show 0s 1.5s forwards; }
@keyframes i18n-show { to { visibility: visible; } }
html[data-lang="en"] [data-only="zh"], html:not([data-lang="en"]) [data-only="en"] { display: none; }
.icon-btn.lang { width: auto; min-width: 38px; padding: 0 10px; font: 700 13.5px var(--font); }

/* ---------- OS notice */
.os-banner {
  position: relative; z-index: 51; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px 10px;
  padding: 10px 52px; font-size: 14px; line-height: 1.5; text-align: center; color: var(--text);
  background: color-mix(in srgb, var(--accent) 14%, var(--bg));
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
}
.os-banner[hidden] { display: none; }
.os-banner .ic { width: 18px; height: 18px; flex: none; color: var(--accent-strong); }
.os-banner a { font-weight: 700; color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; white-space: nowrap; }
.os-banner.warn { background: color-mix(in srgb, #f59e0b 16%, var(--bg)); border-bottom-color: color-mix(in srgb, #f59e0b 38%, transparent); }
.os-banner.warn .ic { color: #b45309; }
:root[data-theme="dark"] .os-banner.warn .ic { color: #fbbf24; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .os-banner.warn .ic { color: #fbbf24; } }
.os-banner .x {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%); width: 32px; height: 32px; padding: 0;
  display: grid; place-items: center; border: none; border-radius: 8px; background: none; color: var(--text-2); cursor: pointer;
}
.os-banner .x:hover { color: var(--text); background: color-mix(in srgb, var(--text) 8%, transparent); }
.os-banner .x svg { width: 16px; height: 16px; }
@media (max-width: 760px) {
  .os-banner { padding: 10px 46px 10px 16px; justify-content: flex-start; align-items: flex-start; text-align: left; font-size: 13.5px; }
  .os-banner .ic { margin-top: 2px; }
  .os-banner #osMsg { flex: 1 1 calc(100% - 28px); min-width: 0; }
  .os-banner a { margin-left: 28px; }
}

/* ---------- reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s cubic-bezier(.2,.8,.2,1), transform .7s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }

.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  padding: 10px 18px; border-radius: 10px; background: var(--text); color: var(--bg); font-size: 14px; font-weight: 500;
  transition: opacity .2s, transform .2s; z-index: 100;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- responsive */
@media (max-width: 1020px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy { text-align: center; }
  .lead { margin-inline: auto; }
  .cta, .cta-meta { justify-content: center; }
  .app-stage { max-width: 760px; margin: 0 auto; width: 100%; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .feat, .feat.wide { grid-column: span 1; }
  .feat.wide:last-child { grid-column: 1 / -1; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
  .dl { grid-template-columns: minmax(0, 1fr); }
  .dl-side { border-left: none; border-top: 1px solid var(--border); }
}
@media (max-width: 900px) {
  .nav-links { display: none; }
}
@media (max-width: 760px) {
  .nav .btn-sm span { display: none; }
  .hero { padding-top: 44px; }
  section { padding: 72px 0; }
  .bento, .steps { grid-template-columns: 1fr; }
  .app-stage { display: none; }
  .dl-main, .dl-side { padding: 28px 22px; }
  .spec { grid-template-columns: 1fr; gap: 4px; }
  footer .wrap { grid-template-columns: 1fr; }
  .final { padding: 56px 22px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- download source switch (direct link / GitHub) */
.src-switch { display: flex; width: fit-content; gap: 2px; padding: 3px; margin: 0 0 8px; border-radius: 11px; background: color-mix(in srgb, var(--text) 6%, transparent); }
.src-switch button { display: flex; align-items: center; gap: 7px; height: 34px; padding: 0 14px; border: none; border-radius: 8px; background: none; cursor: pointer; font: 500 14px var(--font); color: var(--text-2); transition: background .15s, color .15s; }
.src-switch button svg { width: 16px; height: 16px; flex: none; }
.src-switch button.on { background: var(--card); color: var(--text); font-weight: 700; box-shadow: var(--shadow); }
.src-switch button.on svg { color: var(--accent-strong); }
.src-switch button:disabled { opacity: .45; cursor: not-allowed; }
.src-hint { margin: 0 0 18px; font-size: 13px; color: var(--text-3); }

/* ---------- platform switch (hero) + "other platform" hint */
.plat {
  display: flex; width: fit-content; gap: 2px; padding: 3px; margin-bottom: 20px; border-radius: 12px;
  background: color-mix(in srgb, var(--text) 6%, transparent);
}
.plat a {
  display: flex; align-items: center; gap: 7px; height: 34px; padding: 0 14px; border-radius: 9px;
  font-size: 14px; font-weight: 600; color: var(--text-2); transition: color .15s, background .15s;
}
.plat a svg { width: 16px; height: 16px; flex: none; }
.plat a:hover { color: var(--text); }
.plat a[aria-current="page"] { background: var(--card); color: var(--text); font-weight: 700; box-shadow: var(--shadow); }
.plat a[aria-current="page"] svg { color: var(--accent-strong); }
.plat .beta {
  font-size: 10.5px; font-weight: 700; line-height: 18px; padding: 0 6px; border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent-strong);
}
.alt-plat {
  display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; margin-top: 22px; padding: 12px 14px; border-radius: 12px;
  border: 1px dashed var(--border-2); font-size: 14px; color: var(--text-2);
}
.alt-plat svg { width: 18px; height: 18px; flex: none; color: var(--accent-strong); }
.alt-plat a { margin-left: auto; font-weight: 700; color: var(--accent-strong); white-space: nowrap; }
.alt-plat a:hover { text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 1020px) { .hero-copy .plat { margin-inline: auto; } }
@media (max-width: 1020px) and (min-width: 761px) {
  footer .wrap { grid-template-columns: repeat(3, 1fr); }
  footer .wrap > div:first-child { grid-column: 1 / -1; }
}