/* ==========================================================================
   AdDuo · adduo.cc — duotone design system
   视觉语言：近黑底 + 紫(#7b5cff)/薄荷(#2ee6c4) 双色叠加，
   两块交叠的圆 = "duo"：双端 / 双色 / 双赢。
   ========================================================================== */

:root {
  --bg: #05060a;
  --bg-soft: #080a11;
  --surface: #0b0e15;
  --surface-2: #10141d;
  --line: rgba(255, 255, 255, 0.075);
  --line-2: rgba(255, 255, 255, 0.14);
  --ink: #eceff8;
  --muted: #98a0b5;
  --dim: #6a7287;
  --violet: #7b5cff;
  --mint: #2ee6c4;
  --amber: #ffc46b;
  --duo: linear-gradient(115deg, #7b5cff 0%, #5f7bff 44%, #2ee6c4 100%);
  /* 用于文字：起点抬亮一档，避免深紫字压在近黑底上像阴影 */
  --duo-text: linear-gradient(104deg, #a98dff 0%, #6fb6ff 46%, #2ee6c4 100%);
  --duo-soft: linear-gradient(115deg, rgba(123, 92, 255, 0.16), rgba(46, 230, 196, 0.14));
  --r-lg: 24px;
  --r-md: 16px;
  --r-sm: 10px;
  --max: 1180px;
  --pad: clamp(16px, 4vw, 32px);
  --ff: "Inter", "SF Pro Display", -apple-system, "Segoe UI Variable", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--ff);
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 极细颗粒：压住大面积纯黑的塑料感 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  opacity: 0.028;
  mix-blend-mode: screen;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

img,
svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 660;
  letter-spacing: -0.028em;
  line-height: 1.14;
  text-wrap: balance;
}

p { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button { font: inherit; color: inherit; }

::selection {
  background: rgba(46, 230, 196, 0.28);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
  border-radius: 4px;
}

[id] { scroll-margin-top: 96px; }

/* ---------- layout ---------- */
.container {
  width: min(var(--max), 100% - (var(--pad) * 2));
  margin-inline: auto;
}

.section {
  position: relative;
  padding: clamp(46px, 5.6vw, 92px) 0;
}

.section-tight { padding: clamp(40px, 5vw, 72px) 0; }

.sec-head { max-width: 740px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint);
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: linear-gradient(90deg, var(--mint), transparent);
}

.sec-head h2 {
  margin-top: 14px;
  font-size: clamp(26px, 3.2vw, 42px);
}

.sec-head p {
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
  max-width: 62ch;
}

.sec-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.muted { color: var(--muted); }
.dim { color: var(--dim); }

.duo-text {
  font-style: normal;
  color: var(--mint);
  text-shadow: 0 6px 26px rgba(46, 230, 196, 0.16);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.005em;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.3s var(--ease),
    background 0.25s var(--ease), border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.btn svg { width: 15px; height: 15px; flex: none; }

.btn-primary {
  background: var(--duo);
  color: #05060a;
  box-shadow: 0 12px 34px -14px rgba(123, 92, 255, 0.9),
    inset 0 0 0 1px rgba(255, 255, 255, 0.16);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 44px -16px rgba(46, 230, 196, 0.75),
    inset 0 0 0 1px rgba(255, 255, 255, 0.24);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.045);
  border-color: var(--line-2);
  color: var(--ink);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.24);
  transform: translateY(-2px);
}

.btn-sm {
  height: 40px;
  padding: 0 16px;
  font-size: 14px;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--mint);
}

.link-arrow svg { width: 14px; height: 14px; transition: transform 0.25s var(--ease); }
.link-arrow:hover svg { transform: translateX(3px); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 6, 10, 0.72);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(5, 6, 10, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 660;
  letter-spacing: -0.03em;
  flex: none;
}

.brand-mark { width: 30px; height: 30px; }
.brand-dot { color: var(--mint); }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  padding: 9px 13px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--muted);
  transition: color 0.2s ease, background 0.2s ease;
}

.nav a:hover { color: var(--ink); background: rgba(255, 255, 255, 0.05); }

.nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ---------- language switch ---------- */
.lang {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  flex: none;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
}

.lang a {
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--dim);
  transition: color 0.2s ease, background 0.2s ease;
}

.lang a:hover { color: var(--ink); }

.lang a[aria-current="true"] {
  background: rgba(255, 255, 255, 0.1);
  color: var(--ink);
}

.burger {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  position: relative;
}

.burger span {
  position: absolute;
  left: 50%;
  width: 15px;
  height: 1.5px;
  margin-left: -7.5px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s ease;
}

.burger span:nth-child(1) { top: 16px; }
.burger span:nth-child(2) { top: 22px; }

.site-header.is-open .burger span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.site-header.is-open .burger span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(44px, 6.5vw, 92px) 0 clamp(36px, 5vw, 68px);
}

.hero-bg {
  position: absolute;
  inset: -24% -12% auto -12%;
  height: 900px;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(44% 44% at 20% 22%, rgba(123, 92, 255, 0.24), transparent 64%),
    radial-gradient(38% 38% at 80% 10%, rgba(46, 230, 196, 0.16), transparent 62%),
    radial-gradient(60% 60% at 52% -4%, rgba(95, 123, 255, 0.12), transparent 72%);
  filter: blur(16px);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(72% 62% at 50% 0%, #000 20%, transparent 78%);
  mask-image: radial-gradient(72% 62% at 50% 0%, #000 20%, transparent 78%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  gap: clamp(32px, 4.4vw, 60px);
  align-items: center;
}

.hero-title {
  margin-top: 18px;
  font-size: clamp(34px, 4.5vw, 60px);
  font-weight: 680;
  line-height: 1.04;
  letter-spacing: -0.038em;
}

.hero-title em,
.page-hero h1 em {
  font-style: normal;
  color: var(--mint);
  text-shadow: 0 6px 28px rgba(46, 230, 196, 0.15);
}

/* 英文标题不跟中文的字号走：拉丁字面窄，同字号会把标题撑成三行 */
html[lang="en"] .hero-title {
  font-size: clamp(30px, 3.7vw, 52px);
  letter-spacing: -0.03em;
}

html[lang="en"] .page-hero h1 {
  font-size: clamp(28px, 3.4vw, 46px);
  letter-spacing: -0.028em;
}

html[lang="en"] .sec-head h2 { letter-spacing: -0.024em; }

.hero-sub {
  margin-top: 20px;
  max-width: 54ch;
  color: var(--muted);
  font-size: clamp(15px, 1.15vw, 17px);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.micro {
  margin-top: 16px;
  font-size: 13px;
  color: var(--dim);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: clamp(30px, 3.6vw, 44px);
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.stat b {
  display: block;
  font-size: clamp(21px, 2.3vw, 29px);
  font-weight: 660;
  letter-spacing: -0.032em;
  font-variant-numeric: tabular-nums;
  background-image: var(--duo-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.stat span {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  color: var(--dim);
  line-height: 1.35;
}

/* ---------- dashboard mock ---------- */
.mock {
  position: relative;
  z-index: 1;
  padding-bottom: 46px;
  perspective: 1200px;
}

.mock::before {
  content: "";
  position: absolute;
  inset: 8% -6% -8% 4%;
  z-index: -1;
  background: radial-gradient(60% 60% at 60% 40%, rgba(123, 92, 255, 0.3), transparent 70%),
    radial-gradient(50% 50% at 20% 80%, rgba(46, 230, 196, 0.2), transparent 70%);
  filter: blur(40px);
}

.mock-panel {
  padding: 16px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, #0f131c 0%, #090c13 100%);
  box-shadow: 0 44px 90px -46px rgba(0, 0, 0, 0.95),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  animation: floatPanel 9s ease-in-out infinite;
}

@keyframes floatPanel {
  0%, 100% { transform: translateY(0) rotateX(0deg); }
  50% { transform: translateY(-9px) rotateX(0.6deg); }
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 4px 12px;
  border-bottom: 1px solid var(--line);
}

.dots { display: inline-flex; gap: 5px; }
.dots i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
}

.mock-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--dim);
}

.mock-live {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.mock-live i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 0 rgba(46, 230, 196, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  70% { box-shadow: 0 0 0 7px rgba(46, 230, 196, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 230, 196, 0); }
}

.mock-kpis {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.kpi {
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.028);
}

.kpi small {
  display: block;
  font-size: 10.5px;
  color: var(--dim);
  letter-spacing: 0.02em;
}

.kpi b {
  display: block;
  margin-top: 2px;
  font-size: 15.5px;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.delta { font-size: 10.5px; font-variant-numeric: tabular-nums; }
.delta.up { color: var(--mint); }
.delta.down { color: #8ea0ff; }

.mock-chart {
  display: flex;
  align-items: flex-end;
  gap: 5px;
  height: 128px;
  margin-top: 16px;
  padding: 0 2px;
  border-bottom: 1px solid var(--line);
}

.mock-chart i {
  flex: 1;
  min-width: 0;
  border-radius: 3px 3px 1px 1px;
  background: linear-gradient(180deg, var(--mint) 0%, rgba(123, 92, 255, 0.55) 100%);
  transform-origin: bottom;
  opacity: 0.92;
  animation: barIn 0.9s var(--ease) both;
}

.mock-chart i:nth-child(3n) {
  background: linear-gradient(180deg, #9c86ff 0%, rgba(123, 92, 255, 0.5) 100%);
}

@keyframes barIn {
  from { transform: scaleY(0.06); opacity: 0; }
  to { transform: scaleY(1); opacity: 0.92; }
}

.mock-rows { margin-top: 12px; display: grid; gap: 9px; }

.mrow {
  display: grid;
  grid-template-columns: 74px 1fr 42px;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  color: var(--muted);
}

.mrow b {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  font-weight: 560;
}

.track {
  height: 5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.07);
  overflow: hidden;
}

.track i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--duo);
}

.float-badge {
  position: absolute;
  left: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  background: rgba(12, 15, 22, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 24px 50px -28px rgba(0, 0, 0, 0.9);
}

.float-badge b {
  font-size: 18px;
  letter-spacing: -0.03em;
  background-image: var(--duo-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.float-badge span { font-size: 11.5px; color: var(--dim); line-height: 1.3; }

/* ---------- ticker ---------- */
.ticker {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.016);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.ticker-track {
  display: flex;
  width: max-content;
  animation: marquee 38s linear infinite;
}

.ticker:hover .ticker-track { animation-play-state: paused; }

.ticker-track span {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 15px 0 15px 32px;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  white-space: nowrap;
}

.ticker-track span::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--violet);
  opacity: 0.8;
}

@keyframes marquee {
  to { transform: translateX(-50%); }
}

/* ---------- tabs ---------- */
.tabs-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: clamp(28px, 3.4vw, 40px);
}

.tabs {
  position: relative;
  display: inline-flex;
  gap: 2px;
  padding: 5px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
}

.tabs .pill {
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 5px;
  width: 0;
  border-radius: 999px;
  background: var(--duo);
  box-shadow: 0 8px 22px -10px rgba(123, 92, 255, 0.9);
  transition: transform 0.36s var(--ease), width 0.36s var(--ease);
  z-index: 0;
}

.tabs button {
  position: relative;
  z-index: 1;
  height: 38px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--muted);
  font-size: 14.5px;
  font-weight: 560;
  cursor: pointer;
  transition: color 0.25s ease;
  white-space: nowrap;
}

.tabs button[aria-selected="true"] { color: #05060a; }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"]:hover { color: #05060a; }

.tabpanel { margin-top: 26px; animation: fadeUp 0.4s var(--ease) both; }
.tabpanel[hidden] { display: none; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- feature list ---------- */
.flist { display: grid; }

.flist.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 36px;
}

.flist li {
  display: flex;
  gap: 13px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.flist .ic {
  flex: none;
  width: 23px;
  height: 23px;
  margin-top: 2px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: rgba(46, 230, 196, 0.13);
  color: var(--mint);
}

.flist .ic svg { width: 12px; height: 12px; }

.flist b {
  display: block;
  font-weight: 560;
  font-size: 15.5px;
  letter-spacing: -0.012em;
}

.flist p {
  margin-top: 3px;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- cards / bento ---------- */
.card {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 2.3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.038), rgba(255, 255, 255, 0.01));
  transition: transform 0.35s var(--ease), border-color 0.35s ease;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  background: radial-gradient(
    340px circle at var(--mx, 50%) var(--my, 0%),
    rgba(123, 92, 255, 0.18),
    transparent 68%
  );
}

.card:hover { border-color: var(--line-2); transform: translateY(-3px); }
.card:hover::after { opacity: 1; }

.card h3 {
  margin-top: 16px;
  font-size: 18.5px;
  font-weight: 620;
}

.card p {
  margin-top: 8px;
  font-size: 14.3px;
  color: var(--muted);
}

.card .ic-lg {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--line-2);
  background: var(--duo-soft);
  color: var(--mint);
}

.card .ic-lg svg { width: 18px; height: 18px; }

.card-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.bento {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(32px, 4vw, 48px);
}

.b-2 { grid-column: span 2; }
.b-3 { grid-column: span 3; }
.b-4 { grid-column: span 4; }
.b-6 { grid-column: span 6; }

.card-wide {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(18px, 2.4vw, 32px);
  align-items: center;
}

.card-wide h3 { margin-top: 0; font-size: clamp(19px, 2vw, 23px); }

.bento-visual {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  height: 108px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.28);
}

.bento-visual i {
  flex: 1;
  border-radius: 4px 4px 2px 2px;
  background: linear-gradient(180deg, rgba(46, 230, 196, 0.85), rgba(123, 92, 255, 0.35));
}

/* ---------- formats ---------- */
.fmt-layout {
  display: grid;
  grid-template-columns: 316px minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(32px, 4vw, 46px);
  align-items: start;
}

.fmt-list { display: grid; gap: 6px; }

.fmt-list button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 15px 18px;
  border: 1px solid transparent;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.022);
  color: var(--muted);
  font-size: 15px;
  font-weight: 560;
  text-align: left;
  cursor: pointer;
  transition: color 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.fmt-list button:hover { color: var(--ink); background: rgba(255, 255, 255, 0.055); }

.fmt-list button[aria-selected="true"] {
  color: var(--ink);
  border-color: rgba(46, 230, 196, 0.32);
  background: linear-gradient(90deg, rgba(46, 230, 196, 0.13), rgba(123, 92, 255, 0.1));
}

.fmt-list .en {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--dim);
  text-transform: uppercase;
}

.fmt-list button[aria-selected="true"] .en { color: var(--mint); }

.fmt-panel {
  min-height: 330px;
  padding: clamp(22px, 2.8vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(123, 92, 255, 0.14), transparent 58%),
    linear-gradient(180deg, #0d1017, #080a10);
}

.fmt-panel h3 {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 660;
}

.fmt-panel > p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 15px;
  max-width: 60ch;
}

.fmt-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag {
  padding: 6px 11px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
}

.tag.hi {
  border-color: transparent;
  background: var(--mint);
  color: #05060a;
  font-weight: 600;
}

.tag.violet {
  border-color: rgba(123, 92, 255, 0.45);
  background: rgba(123, 92, 255, 0.14);
  color: #c3b6ff;
}

.fmt-spec {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.fmt-spec div {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.022);
}

.fmt-spec small {
  display: block;
  font-size: 11.5px;
  color: var(--dim);
  letter-spacing: 0.03em;
}

.fmt-spec b {
  font-size: 14.5px;
  font-weight: 560;
  font-variant-numeric: tabular-nums;
}

.fmt-actions { margin-top: 26px; display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- scale / stats ---------- */
.scale {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.statgrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.statbox {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.022);
}

.statbox b {
  display: block;
  font-size: clamp(24px, 2.6vw, 33px);
  font-weight: 660;
  letter-spacing: -0.034em;
  font-variant-numeric: tabular-nums;
}

.statbox span { font-size: 12.5px; color: var(--dim); }

.spark {
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent);
}

.spark-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 12.5px;
  color: var(--dim);
}

.spark-head b { color: var(--ink); font-size: 14px; font-variant-numeric: tabular-nums; }
.spark svg { width: 100%; height: 84px; margin-top: 8px; }

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(32px, 4vw, 48px);
  counter-reset: step;
}

.step {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.008));
  overflow: hidden;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.step::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 92, 255, 0.2), transparent 70%);
}

.step h3 { margin-top: 12px; font-size: 16.5px; font-weight: 600; }
.step p { margin-top: 8px; font-size: 13.8px; color: var(--muted); }

/* ---------- reviews ---------- */
.reviews {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(32px, 4vw, 48px);
}

.review {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.022);
  transition: border-color 0.3s ease, transform 0.3s var(--ease);
}

.review:hover { border-color: var(--line-2); transform: translateY(-3px); }

.review p {
  font-size: 15px;
  line-height: 1.62;
  color: #d8dded;
}

.review footer {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  font-size: 12.5px;
  color: var(--dim);
}

.avatar {
  flex: none;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--duo);
  color: #05060a;
  font-size: 12.5px;
  font-weight: 700;
}

.review .stars {
  display: flex;
  gap: 2px;
  color: var(--amber);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- faq ---------- */
.faq {
  max-width: 860px;
  margin-top: clamp(28px, 3.4vw, 40px);
}

.faq details { border-bottom: 1px solid var(--line); }

.faq summary {
  position: relative;
  padding: 18px 38px 18px 0;
  font-size: 16.5px;
  font-weight: 560;
  letter-spacing: -0.012em;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--mint);
  transition: transform 0.3s var(--ease);
}

.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }

.faq details p {
  padding: 0 38px 20px 0;
  max-width: 72ch;
  font-size: 15px;
  color: var(--muted);
}

.faq details .accent { color: var(--ink); }

/* ---------- cta band ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 5.4vw, 68px);
  border: 1px solid var(--line-2);
  border-radius: 28px;
  text-align: center;
  background:
    radial-gradient(80% 130% at 50% -10%, rgba(123, 92, 255, 0.26), transparent 66%),
    radial-gradient(50% 80% at 90% 110%, rgba(46, 230, 196, 0.16), transparent 70%),
    linear-gradient(180deg, #0b0e16, #070910);
}

.cta-band::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(60% 60% at 50% 40%, #000, transparent 80%);
  mask-image: radial-gradient(60% 60% at 50% 40%, #000, transparent 80%);
}

.cta-band > * { position: relative; z-index: 1; }

.cta-band h2 { font-size: clamp(26px, 3.4vw, 44px); }

.cta-band p {
  margin: 16px auto 0;
  max-width: 54ch;
  color: var(--muted);
}

.cta-band .cta-row { justify-content: center; }

/* ---------- page hero (inner pages) ---------- */
.page-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(44px, 6vw, 86px) 0 clamp(20px, 3vw, 36px);
}

.page-hero-bg {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 700px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(42% 42% at 18% 26%, rgba(123, 92, 255, 0.22), transparent 64%),
    radial-gradient(38% 38% at 82% 8%, rgba(46, 230, 196, 0.14), transparent 62%);
  filter: blur(18px);
}

.page-hero h1 {
  margin-top: 18px;
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 680;
  line-height: 1.06;
  letter-spacing: -0.036em;
}

.page-hero .lead {
  margin-top: 20px;
  max-width: 60ch;
  color: var(--muted);
  font-size: clamp(15px, 1.15vw, 17px);
}

.crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--dim);
  margin-bottom: 4px;
}

.crumb a:hover { color: var(--ink); }

/* ---------- table ---------- */
.tbl-wrap {
  margin-top: clamp(28px, 3.6vw, 42px);
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.016);
  overflow-x: auto;
}

.tbl {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14.2px;
}

.tbl th {
  padding: 14px;
  text-align: left;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
  border-bottom: 1px solid var(--line-2);
  white-space: nowrap;
}

.tbl td {
  padding: 15px 14px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.tbl tr:last-child td { border-bottom: 0; }
.tbl td:first-child { color: var(--ink); font-weight: 560; white-space: nowrap; }
.tbl tr:hover td { background: rgba(255, 255, 255, 0.022); }
.tbl .num { font-variant-numeric: tabular-nums; color: #cfd6e8; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: clamp(40px, 6vw, 80px);
  padding: clamp(40px, 6vw, 72px) 0 26px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, transparent, rgba(123, 92, 255, 0.05));
}

.f-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.f-brand p {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14px;
  color: var(--muted);
}

.f-brand .f-contact { margin-top: 18px; display: grid; gap: 6px; font-size: 13.5px; }
.f-brand .f-contact a { color: var(--mint); }
.f-brand .f-contact span { color: var(--dim); }

.f-col h4 {
  margin-bottom: 12px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
}

.f-col a {
  display: block;
  padding: 6px 0;
  font-size: 14.2px;
  color: var(--muted);
  transition: color 0.2s ease;
}

.f-col a:hover { color: var(--ink); }

.f-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--dim);
}

.f-legal { display: flex; flex-wrap: wrap; gap: 16px; }
.f-legal a:hover { color: var(--ink); }

/* ---------- reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
  transition-delay: var(--d, 0ms);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- grids ---------- */
.grid2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(30px, 4vw, 44px);
}

.grid3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(30px, 4vw, 44px);
}

.grid2 .card h3,
.grid3 .card h3 { margin-top: 14px; }

.grid3 .card .card-num { display: block; }

/* ---------- key / value 规格行 ---------- */
.kv { margin: 16px 0 0; }

.kv > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-top: 10px;
  margin-top: 10px;
  border-top: 1px solid var(--line);
}

.kv dt { font-size: 12.5px; color: var(--dim); flex: none; }

.kv dd {
  margin: 0;
  font-size: 13.5px;
  color: #cfd6e8;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---------- 标签云 ---------- */
.tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 提示框 ---------- */
.note {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(46, 230, 196, 0.1), transparent 58%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.012));
}

.note h3 {
  font-size: 17.5px;
  font-weight: 620;
}

.note .flist li:last-child { border-bottom: 0; padding-bottom: 0; }

/* ---------- 定向设置面板 ---------- */
.setrows { margin-top: 12px; display: grid; }

.setrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 4px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.07);
  font-size: 12px;
}

.setrow span { color: var(--dim); flex: none; }
.setrow b {
  font-weight: 560;
  font-size: 12px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.mock-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(46, 230, 196, 0.22);
  border-radius: 11px;
  background: rgba(46, 230, 196, 0.07);
  font-size: 11.5px;
  color: var(--dim);
}

.mock-foot b { color: var(--mint); font-size: 12px; font-variant-numeric: tabular-nums; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .mock { max-width: 560px; margin-top: 12px; }
  .scale { grid-template-columns: minmax(0, 1fr); }
  .bento { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .b-4, .b-3 { grid-column: span 2; }
  .b-2 { grid-column: span 2; }
  .b-6 { grid-column: span 4; }
  .card-wide { grid-column: span 4; }
  .fmt-layout { grid-template-columns: minmax(0, 1fr); }
  .fmt-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }
  .fmt-list button { width: auto; flex: none; padding: 12px 16px; }
  .fmt-list .en { display: none; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reviews { grid-template-columns: minmax(0, 1fr); }
  .f-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}

@media (max-width: 860px) {
  .nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px var(--pad) 20px;
    background: rgba(7, 9, 14, 0.98);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(20px);
    display: none;
  }

  .site-header.is-open .nav { display: flex; }
  .nav a { padding: 13px 14px; font-size: 15.5px; border-radius: 12px; }
  .burger { display: block; }
  .header-actions .btn-ghost { display: none; }
  .header-actions { gap: 6px; }
  .lang a { padding: 4px 8px; font-size: 12px; }

  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 22px; }
  .flist.two { grid-template-columns: minmax(0, 1fr); }
  .tabpanel { margin-top: 20px; }
  .float-badge { left: 0; bottom: 0; }
  .tbl { font-size: 13.6px; }
}

@media (max-width: 620px) {
  .bento { grid-template-columns: minmax(0, 1fr); }
  .b-2, .b-3, .b-4, .b-6, .card-wide { grid-column: span 1; }
  .card-wide { grid-template-columns: minmax(0, 1fr); }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .fmt-spec { grid-template-columns: minmax(0, 1fr); }
  .statgrid { grid-template-columns: minmax(0, 1fr); }
  .f-grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .cta-row .btn { flex: 1 1 auto; }
  .float-badge { display: none; }
  .mock { padding-bottom: 0; }
  /* 窄屏优先保证 logo + 语言切换 + 汉堡不挤爆；CTA 交给首屏按钮 */
  .header-actions .btn-primary { display: none; }
  .brand { font-size: 17px; }
  .brand-mark { width: 26px; height: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}

@media (max-width: 1080px) {
  .grid3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid2,
  .grid3 { grid-template-columns: minmax(0, 1fr); }
  .kv dd { max-width: 60%; }
}