/* ==========================================================================
   WA iOS — 设计系统
   1. 令牌  2. 基础  3. 组件  4. 首页  5. 功能页  6. 响应式
   ========================================================================== */

/* 1. 令牌 ---------------------------------------------------------------- */
:root {
  color-scheme: light;

  /* 品牌色阶 */
  --brand-50: #eafaf1;
  --brand-100: #d2f4e2;
  --brand-200: #a6e9c6;
  --brand-300: #6ed9a4;
  --brand-400: #34c684;
  --brand-500: #12a066;
  --brand-600: #0a8354;
  --brand-700: #076845;
  --brand-800: #054e35;
  --brand-900: #033325;

  /* 语义色 */
  --bg: #f5f8f6;
  --bg-soft: #eaefec;
  --surface: #ffffff;
  --surface-2: #f8fbf9;
  --surface-3: #f1f6f3;
  --surface-glass: rgba(255, 255, 255, .78);
  --text: #0a1710;
  --text-2: #4b5c53;
  --text-3: #7c8d84;
  --text-4: #9dada4;
  --border: #e2e9e5;
  --border-2: #cfdad4;
  --grid-line: rgba(10, 40, 26, .07);

  --brand: var(--brand-500);
  --brand-press: var(--brand-600);
  --brand-text: var(--brand-700);
  --brand-tint: var(--brand-50);
  --brand-tint-2: #f2fbf6;
  --on-brand: #ffffff;

  --grad-brand: linear-gradient(135deg, #34d996 0%, #12a066 52%, #0a7b50 100%);
  --grad-line: linear-gradient(90deg, transparent, var(--brand-300), transparent);
  --grad-sheen: linear-gradient(180deg, rgba(255, 255, 255, .9), rgba(255, 255, 255, 0));

  --shadow-xs: 0 1px 2px rgba(9, 30, 20, .05);
  --shadow-sm: 0 2px 6px rgba(9, 30, 20, .05), 0 1px 2px rgba(9, 30, 20, .04);
  --shadow-md: 0 10px 26px -8px rgba(9, 30, 20, .14), 0 3px 8px -3px rgba(9, 30, 20, .07);
  --shadow-lg: 0 26px 60px -18px rgba(9, 30, 20, .22), 0 8px 20px -10px rgba(9, 30, 20, .1);
  --shadow-brand: 0 10px 26px -8px color-mix(in srgb, var(--brand) 42%, transparent);
  --ring: 0 0 0 3px color-mix(in srgb, var(--brand) 26%, transparent);

  /* 排版 */
  --font-display: "SF Pro Display", "Segoe UI Variable Display", Inter, system-ui, -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-sans: Inter, "SF Pro Text", "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --fs-2xs: 10.5px;
  --fs-xs: 11.5px;
  --fs-sm: 12.5px;
  --fs-md: 13.5px;
  --fs-base: 15px;
  --fs-lg: 16.5px;
  --fs-xl: clamp(19px, 1.5vw, 21px);
  --fs-2xl: clamp(24px, 2.9vw, 33px);
  --fs-3xl: clamp(29px, 3.4vw, 39px);
  --fs-display: clamp(31px, 3.9vw, 51px);

  /* 尺寸与节奏 */
  --radius-xs: 7px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --nav-h: 68px;
  --wrap: 1180px;
  --sidebar-width: 276px;
  --content-width: 1000px;

  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in-out: cubic-bezier(.5, 0, .3, 1);
  --dur-1: .16s;
  --dur-2: .28s;
  --dur-3: .5s;

  /* 科技感背景层 */
  --tech-grid: rgba(10, 40, 26, .06);
  --tech-dot: rgba(16, 150, 96, .62);
  --tech-line: rgba(16, 150, 96, .2);
  --glow-a: rgba(52, 217, 150, .24);
  --glow-b: rgba(14, 143, 85, .16);
  --vignette: color-mix(in srgb, var(--bg) 74%, transparent);
}

html[data-theme="dark"] {
  color-scheme: dark;

  --bg: #060b09;
  --bg-soft: #0a110d;
  --surface: #0e1712;
  --surface-2: #121d17;
  --surface-3: #16231c;
  --surface-glass: rgba(14, 23, 18, .72);
  --text: #e9f2ec;
  --text-2: #a3b4aa;
  --text-3: #7c8d84;
  --text-4: #62736a;
  --border: rgba(255, 255, 255, .085);
  --border-2: rgba(255, 255, 255, .16);
  --grid-line: rgba(120, 255, 190, .045);

  --brand: #34d996;
  --brand-press: #57e6ab;
  --brand-text: #6fe7b1;
  --brand-tint: rgba(52, 217, 150, .12);
  --brand-tint-2: rgba(52, 217, 150, .07);
  --on-brand: #032317;

  --grad-brand: linear-gradient(135deg, #5ceaad 0%, #2ccb8c 52%, #14a06a 100%);
  --grad-sheen: linear-gradient(180deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, 0));

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, .4);
  --shadow-md: 0 12px 30px -10px rgba(0, 0, 0, .6);
  --shadow-lg: 0 30px 70px -22px rgba(0, 0, 0, .8);
  --shadow-brand: 0 12px 30px -10px color-mix(in srgb, var(--brand) 34%, transparent);

  --tech-grid: rgba(120, 255, 190, .05);
  --tech-dot: rgba(90, 240, 175, .55);
  --tech-line: rgba(70, 230, 160, .13);
  --glow-a: rgba(28, 190, 128, .32);
  --glow-b: rgba(10, 125, 82, .3);
  --vignette: color-mix(in srgb, var(--bg) 80%, transparent);
}

/* 2. 基础 ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.62;
  letter-spacing: -.006em;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.03em;
  text-wrap: balance;
}
p { text-wrap: pretty; }
button, input { color: inherit; font: inherit; letter-spacing: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
code, kbd { font-family: var(--font-mono); }
dl, dd { margin: 0; }

svg { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

[hidden] { display: none !important; }
::selection { color: var(--on-brand); background: var(--brand); }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 200; padding: 10px 14px; border-radius: var(--radius-xs); color: var(--on-brand); background: var(--brand); box-shadow: var(--shadow-md); font-size: var(--fs-sm); font-weight: 600; transform: translateY(-180%); transition: transform var(--dur-2) var(--ease-out); }
.skip-link:focus { transform: none; }

* { scrollbar-width: thin; scrollbar-color: var(--border-2) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { border: 3px solid transparent; border-radius: 999px; background: var(--border-2); background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: var(--text-4); background-clip: padding-box; }

/* 3. 组件 ---------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 15px;
  color: var(--brand-text);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 650;
  letter-spacing: .09em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: linear-gradient(90deg, transparent, currentColor);
}

.brand { display: inline-flex; min-width: 0; align-items: center; gap: 12px; }
.brand-mark { width: 38px; height: 38px; flex: 0 0 auto; border-radius: 11px; filter: drop-shadow(0 6px 14px color-mix(in srgb, var(--brand) 26%, transparent)); transition: transform var(--dur-2) var(--ease-out); }
.brand:hover .brand-mark { transform: translateY(-1px) rotate(-3deg); }
.brand-copy { display: flex; min-width: 0; flex-direction: column; line-height: 1.24; }
.brand-copy strong { color: var(--text); font-family: var(--font-display); font-size: var(--fs-lg); font-weight: 700; letter-spacing: -.026em; }
.brand-copy small { margin-top: 2px; color: var(--text-3); font-size: var(--fs-2xs); letter-spacing: .01em; }

.icon-button {
  position: relative;
  display: grid;
  width: 38px;
  height: 38px;
  padding: 0;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
  transition: color var(--dur-1) ease, border-color var(--dur-1) ease, background var(--dur-1) ease, transform var(--dur-1) var(--ease-out);
}
.icon-button:hover { color: var(--text); border-color: var(--border-2); background: var(--surface-2); transform: translateY(-1px); }
.icon-button:active { transform: translateY(0); }
.icon-button svg { width: 17px; height: 17px; transition: transform var(--dur-3) var(--ease-out); }
.icon-button:hover svg { transform: rotate(18deg); }
.icon-button.menu-button:hover svg, .icon-button.sidebar-close:hover svg, .nav-toggle:hover svg { transform: none; }
html[data-theme="dark"] .sun-icon,
html:not([data-theme="dark"]) .moon-icon { display: none; }

.button-primary, .button-ghost {
  position: relative;
  display: inline-flex;
  min-height: 42px;
  padding: 0 18px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--fs-md);
  font-weight: 640;
  letter-spacing: -.01em;
  white-space: nowrap;
  transition: color var(--dur-1) ease, border-color var(--dur-1) ease, background var(--dur-1) ease, box-shadow var(--dur-2) ease, transform var(--dur-1) var(--ease-out);
}
.button-primary { color: var(--on-brand); background: var(--grad-brand); box-shadow: var(--shadow-brand); }
.button-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 24%, rgba(255, 255, 255, .3) 48%, transparent 72%);
  transform: translateX(-130%);
  transition: transform .7s var(--ease-out);
}
.button-primary:hover { box-shadow: 0 16px 34px -10px color-mix(in srgb, var(--brand) 52%, transparent); transform: translateY(-2px); }
.button-primary:hover::after { transform: translateX(130%); }
.button-primary:active { transform: translateY(0) scale(.99); }
.button-ghost { color: var(--text); border-color: var(--border-2); background: var(--surface); box-shadow: var(--shadow-xs); }
.button-ghost:hover { color: var(--brand-text); border-color: color-mix(in srgb, var(--brand) 45%, var(--border-2)); background: var(--brand-tint-2); transform: translateY(-2px); }
.button-ghost:active { transform: translateY(0); }
.button-primary svg, .button-ghost svg { width: 16px; height: 16px; transition: transform var(--dur-2) var(--ease-out); }
.button-primary:hover svg, .button-ghost:hover svg { transform: translateX(3px); }
.button-lg { min-height: 50px; padding: 0 24px; border-radius: var(--radius-md); font-size: var(--fs-base); }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 90;
  height: 2px;
  background: var(--grad-brand);
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  will-change: transform;
  pointer-events: none;
}

/* 4. 首页 ---------------------------------------------------------------- */
/* 4.1 科技感背景层 */
.tech-bg { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }
.tech-bg > * { position: absolute; }

.tech-grid {
  inset: 0;
  background-image:
    linear-gradient(to right, var(--tech-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--tech-grid) 1px, transparent 1px);
  background-size: 74px 74px;
  -webkit-mask-image: radial-gradient(130% 100% at 50% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(130% 100% at 50% 0%, #000 18%, transparent 78%);
}

.tech-beam {
  inset: -34%;
  background: linear-gradient(112deg, transparent 40%, var(--glow-a) 50%, transparent 60%);
  opacity: .7;
  filter: blur(70px);
  animation: tech-beam 30s var(--ease-in-out) infinite;
}
@keyframes tech-beam {
  0% { transform: translate3d(-16%, -10%, 0) rotate(0deg); }
  50% { transform: translate3d(12%, 8%, 0) rotate(6deg); }
  100% { transform: translate3d(-16%, -10%, 0) rotate(0deg); }
}

.tech-glow { border-radius: 50%; }
.tech-glow-a {
  top: -26%;
  left: 4%;
  width: 48vw;
  aspect-ratio: 1;
  background: radial-gradient(closest-side, var(--glow-a), transparent 72%);
  animation: tech-float-a 36s var(--ease-in-out) infinite;
}
.tech-glow-b {
  right: -12%;
  bottom: -24%;
  width: 42vw;
  aspect-ratio: 1;
  background: radial-gradient(closest-side, var(--glow-b), transparent 74%);
  animation: tech-float-b 46s var(--ease-in-out) infinite;
}
@keyframes tech-float-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(6%, 5%, 0) scale(1.12); }
}
@keyframes tech-float-b {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1.06); }
  50% { transform: translate3d(-7%, -4%, 0) scale(.94); }
}

.tech-canvas { inset: 0; width: 100%; height: 100%; }
.tech-vignette { inset: 0; background: radial-gradient(128% 96% at 50% 14%, transparent 40%, var(--vignette) 100%); }

.site-nav, .landing-main, .landing-footer, .snap-dots { position: relative; z-index: 1; }
.site-nav { z-index: 60; }

/* 4.2 整屏滚动：吸附点即屏顶，因此关掉滚动内边距/外边距，避免每屏被下推 */
html[data-page="landing"] { scroll-snap-type: y mandatory; scroll-padding-top: 0; }
html[data-page="landing"] .snap-section { scroll-margin-top: 0; }
.snap-section {
  display: grid;
  align-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding-block: calc(var(--nav-h) + 16px) 48px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}
.landing-footer { scroll-snap-align: end; }

.snap-dots { position: fixed; top: 50%; right: clamp(10px, 1.5vw, 22px); z-index: 55; display: grid; gap: 15px; transform: translateY(-50%); }
.snap-dots a { position: relative; display: grid; width: 24px; height: 24px; place-items: center; }
.snap-dots i { width: 7px; height: 7px; border: 1px solid var(--border-2); border-radius: 50%; transition: border-color var(--dur-2) ease, background var(--dur-2) ease, box-shadow var(--dur-2) ease, transform var(--dur-2) var(--ease-out); }
.snap-dots a:hover i { border-color: var(--brand); }
.snap-dots a.is-active i { border-color: var(--brand); background: var(--brand); box-shadow: 0 0 0 4px var(--brand-tint); transform: scale(1.2); }
.snap-dots a::after {
  content: attr(data-label);
  position: absolute;
  right: calc(100% + 10px);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-2);
  background: var(--surface-glass);
  box-shadow: var(--shadow-sm);
  font-size: var(--fs-2xs);
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(6px);
  backdrop-filter: blur(10px);
  transition: opacity var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.snap-dots a:hover::after, .snap-dots a:focus-visible::after { opacity: 1; transform: none; }

.landing-hero { grid-template-rows: minmax(0, 1fr) auto; align-content: stretch; padding-bottom: clamp(76px, 10vh, 112px); }
.landing-hero > .hero-grid { align-self: center; }
.scroll-hint {
  display: inline-flex;
  margin-top: 14px;
  flex-direction: column;
  align-items: center;
  justify-self: center;
  gap: 8px;
  color: var(--text-3);
  font-size: var(--fs-2xs);
  font-weight: 600;
  letter-spacing: .08em;
  transition: color var(--dur-1) ease, opacity var(--dur-2) ease;
}
.scroll-hint:hover { color: var(--brand-text); }
.scroll-hint i { position: relative; width: 22px; height: 34px; border: 1px solid var(--border-2); border-radius: 999px; }
.scroll-hint i::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 50%;
  width: 3px;
  height: 7px;
  border-radius: 2px;
  background: var(--brand);
  animation: scroll-wheel 1.9s var(--ease-out) infinite;
}
@keyframes scroll-wheel {
  0% { opacity: 0; transform: translate(-50%, 0); }
  25% { opacity: 1; }
  75% { opacity: 1; transform: translate(-50%, 12px); }
  100% { opacity: 0; transform: translate(-50%, 14px); }
}

.landing-wrap { width: min(100% - 44px, var(--wrap)); margin-inline: auto; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-2) ease, background var(--dur-2) ease, box-shadow var(--dur-2) ease;
}
.site-nav.is-stuck {
  border-bottom-color: var(--border);
  background: var(--surface-glass);
  box-shadow: 0 8px 30px -20px rgba(9, 30, 20, .3);
  backdrop-filter: blur(18px) saturate(160%);
}
.nav-inner { display: flex; min-height: var(--nav-h); align-items: center; gap: 22px; }
.nav-menu { display: flex; margin-left: 14px; align-items: center; gap: 2px; }
.nav-menu a {
  position: relative;
  padding: 8px 13px;
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-size: var(--fs-md);
  font-weight: 560;
  transition: color var(--dur-1) ease, background var(--dur-1) ease;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  right: 13px;
  bottom: 3px;
  left: 13px;
  height: 1.5px;
  border-radius: 2px;
  background: var(--brand);
  opacity: 0;
  transform: scaleX(.3);
  transition: opacity var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.nav-menu a:hover { color: var(--text); }
.nav-menu a:hover::after, .nav-menu a.is-current::after { opacity: 1; transform: none; }
.nav-menu a.is-current { color: var(--text); }
.nav-actions { display: flex; margin-left: auto; align-items: center; gap: 10px; }
.nav-toggle { display: none; }

.landing-hero { position: relative; }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.16fr) minmax(320px, .84fr); align-items: center; gap: clamp(32px, 4vw, 64px); }
.hero-copy { min-width: 0; }
.hero-title { margin: 0; color: var(--text); font-size: var(--fs-display); font-weight: 720; line-height: 1.14; letter-spacing: -.038em; line-break: strict; }
.hero-title em {
  position: relative;
  font-style: normal;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lead { max-width: 570px; margin: 22px 0 0; color: var(--text-2); font-size: var(--fs-lg); line-height: 1.78; }
.hero-actions { display: flex; margin-top: 32px; flex-wrap: wrap; align-items: center; gap: 12px; }
.hero-note { display: inline-flex; align-items: center; gap: 7px; color: var(--text-3); font-size: var(--fs-sm); }
.hero-note svg { width: 15px; height: 15px; color: var(--brand); }

.hero-stats { display: grid; margin: 40px 0 0; grid-template-columns: repeat(3, minmax(0, auto)); justify-content: start; gap: 0; }
.hero-stats div { padding: 0 26px; border-left: 1px solid var(--border); }
.hero-stats div:first-child { padding-left: 0; border-left: 0; }
.hero-stats dt { color: var(--text-3); font-size: var(--fs-2xs); font-weight: 620; letter-spacing: .12em; text-transform: uppercase; }
.hero-stats dd { margin-top: 7px; color: var(--text); font-family: var(--font-display); font-size: var(--fs-xl); font-weight: 700; letter-spacing: -.032em; font-variant-numeric: tabular-nums; }
.hero-stats dd b { font: inherit; letter-spacing: inherit; }
.hero-stats dd span { margin-left: 4px; color: var(--text-3); font-size: var(--fs-sm); font-weight: 500; letter-spacing: 0; }

/* 首屏能力面板 */
.hero-panel {
  position: relative;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: linear-gradient(168deg, var(--surface), var(--surface-3));
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  isolation: isolate;
}
.hero-panel::after {
  content: "";
  position: absolute;
  top: 0;
  right: 1px;
  left: 1px;
  height: 26%;
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--brand) 15%, transparent), transparent);
  opacity: .65;
  pointer-events: none;
  animation: panel-scan 7.5s linear infinite;
}
@keyframes panel-scan {
  0% { transform: translateY(-45%); }
  100% { transform: translateY(420%); }
}
.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(150deg, color-mix(in srgb, var(--brand) 62%, transparent), transparent 42%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}
.hero-panel-head { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 14px; }
.hero-panel-head img { width: 54px; height: 54px; border-radius: 15px; filter: drop-shadow(0 10px 22px color-mix(in srgb, var(--brand) 32%, transparent)); }
.hero-panel-head strong { display: block; color: var(--text); font-family: var(--font-display); font-size: var(--fs-xl); font-weight: 720; letter-spacing: -.03em; }
.hero-panel-head span { color: var(--text-3); font-size: var(--fs-sm); }
.hero-panel-live { display: inline-flex; margin-left: auto; padding: 5px 10px; align-items: center; gap: 7px; border: 1px solid color-mix(in srgb, var(--brand) 24%, var(--border)); border-radius: 999px; color: var(--brand-text); background: var(--brand-tint); font-size: var(--fs-2xs); font-weight: 650; letter-spacing: .04em; }
.hero-panel-live i { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 60%, transparent); animation: pulse 2.4s var(--ease-out) infinite; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--brand) 55%, transparent); }
  70% { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.hero-panel-grid { display: grid; margin: 22px 0 0; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.panel-cell {
  display: grid;
  aspect-ratio: 1.42;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: color-mix(in srgb, var(--brand-text) 52%, var(--text-2));
  background: linear-gradient(165deg, var(--surface-2), var(--surface-3));
  transition: color var(--dur-2) ease, border-color var(--dur-2) ease, background var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.panel-cell svg { width: 18px; height: 18px; }
.hero-panel:hover .panel-cell { color: var(--brand-text); border-color: color-mix(in srgb, var(--brand) 26%, var(--border)); background: var(--brand-tint-2); }
.panel-cell:hover { color: var(--brand-text); background: var(--brand-tint); transform: translateY(-2px) scale(1.04); }

.hero-chips { display: flex; margin: 20px 0 0; padding: 0; flex-wrap: wrap; gap: 7px; list-style: none; }
.hero-chips li {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-2);
  background: var(--surface-2);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: .01em;
}
.hero-panel-foot { display: flex; margin-top: 20px; padding-top: 16px; align-items: center; justify-content: space-between; gap: 12px; border-top: 1px solid var(--border); color: var(--text-3); font-size: var(--fs-xs); }
.hero-panel-foot b { color: var(--text-2); font-variant-numeric: tabular-nums; }

/* 区块 */
.landing-section { scroll-margin-top: calc(var(--nav-h) + 16px); }
.section-heading { display: grid; margin-bottom: 30px; grid-template-columns: minmax(0, 1fr) minmax(0, .58fr); align-items: end; gap: 16px 48px; }
.section-heading h2 { margin: 0; color: var(--text); font-size: var(--fs-2xl); letter-spacing: -.035em; }
.section-heading > p { margin: 0; color: var(--text-2); font-size: var(--fs-md); line-height: 1.72; }

.why-section { position: relative; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-sm); overflow: hidden; }
.why-intro { padding: 30px 34px; border-bottom: 1px solid var(--border); background: linear-gradient(120deg, var(--brand-tint-2), transparent 62%); }
.why-intro p { max-width: 820px; margin: 0; color: var(--text); font-size: var(--fs-lg); font-weight: 480; line-height: 1.76; }
.why-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--border); }
.why-item { position: relative; padding: 28px 26px 32px; background: var(--surface); transition: background var(--dur-2) ease; }
.why-item::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 2px; background: var(--grad-brand); opacity: 0; transition: opacity var(--dur-2) ease; }
.why-item:hover { background: var(--surface-2); }
.why-item:hover::before { opacity: 1; }
.why-key { display: flex; margin-bottom: 18px; align-items: center; gap: 10px; }
.why-key span { display: grid; width: 30px; height: 30px; place-items: center; border-radius: 9px; color: var(--brand-text); background: var(--brand-tint); font-family: var(--font-mono); font-size: var(--fs-xs); font-weight: 700; }
.why-key strong { color: var(--text-2); font-size: var(--fs-sm); font-weight: 650; letter-spacing: .04em; }
.why-item h3 { margin: 0; color: var(--text); font-size: var(--fs-lg); line-height: 1.42; letter-spacing: -.024em; }
.why-item p { margin: 10px 0 0; color: var(--text-2); font-size: var(--fs-md); line-height: 1.74; }
.why-item p a {
  color: var(--brand-text);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--brand) 38%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--dur-1) ease;
}
.why-item p a:hover { text-decoration-color: var(--brand); }

.module-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.module-grid a {
  position: relative;
  display: flex;
  min-height: 152px;
  padding: 20px;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
  isolation: isolate;
  transition: border-color var(--dur-2) ease, box-shadow var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.module-grid a::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: radial-gradient(240px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--brand) 13%, transparent), transparent 68%);
  opacity: 0;
  transition: opacity var(--dur-2) ease;
}
.module-grid a:hover { border-color: color-mix(in srgb, var(--brand) 34%, var(--border)); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.module-grid a:hover::before { opacity: 1; }
.module-icon {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--brand) 16%, var(--border));
  border-radius: 12px;
  color: var(--brand-text);
  background: linear-gradient(160deg, var(--brand-tint), var(--brand-tint-2));
  transition: color var(--dur-2) ease, border-color var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.module-icon svg { width: 19px; height: 19px; }
.module-grid a:hover .module-icon { border-color: color-mix(in srgb, var(--brand) 44%, var(--border)); transform: translateY(-2px) scale(1.05); }
.module-grid strong { display: block; margin-top: 15px; color: var(--text); font-family: var(--font-display); font-size: var(--fs-lg); font-weight: 680; letter-spacing: -.024em; }
.module-grid p { margin: 6px 0 0; color: var(--text-2); font-size: var(--fs-sm); line-height: 1.66; }
.module-meta { display: flex; margin-top: auto; padding-top: 14px; align-items: center; justify-content: space-between; gap: 10px; }
.module-index { color: var(--text-4); font-family: var(--font-mono); font-size: var(--fs-2xs); font-weight: 600; letter-spacing: .06em; }
.module-count { color: var(--text-2); font-size: var(--fs-xs); font-weight: 620; font-variant-numeric: tabular-nums; }
.module-grid a:hover .module-count { color: var(--brand-text); }
.module-more { display: inline-flex; margin-top: 26px; padding: 12px 20px; align-items: center; gap: 9px; border: 1px solid var(--border-2); border-radius: var(--radius-sm); color: var(--text); background: var(--surface); box-shadow: var(--shadow-xs); font-size: var(--fs-md); font-weight: 620; transition: color var(--dur-1) ease, border-color var(--dur-1) ease, background var(--dur-1) ease, transform var(--dur-1) var(--ease-out); }
.module-more:hover { color: var(--brand-text); border-color: color-mix(in srgb, var(--brand) 42%, var(--border-2)); background: var(--brand-tint-2); transform: translateY(-2px); }
.module-more svg { width: 16px; height: 16px; transition: transform var(--dur-2) var(--ease-out); }
.module-more:hover svg { transform: translateX(4px); }

.cta-band { scroll-margin-top: calc(var(--nav-h) + 16px); }
.cta-inner {
  position: relative;
  display: grid;
  padding: clamp(34px, 3.6vw, 52px);
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px 48px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  color: #f2fdf7;
  background: linear-gradient(128deg, #06301f 0%, #074a30 46%, #0a6a45 100%);
  box-shadow: var(--shadow-lg);
}
.cta-inner::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 620px;
  aspect-ratio: 1;
  background: radial-gradient(closest-side, rgba(52, 217, 150, .38), transparent 70%);
}
.cta-inner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, .07) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(90% 120% at 100% 0%, #000, transparent 72%);
  mask-image: radial-gradient(90% 120% at 100% 0%, #000, transparent 72%);
}
.cta-copy { position: relative; z-index: 1; }
.cta-copy .eyebrow { color: #7ff0b8; }
.cta-inner h2 { margin: 0; color: #f6fffa; font-size: var(--fs-2xl); letter-spacing: -.035em; }
.cta-inner p { max-width: 520px; margin: 12px 0 0; color: rgba(226, 250, 237, .74); font-size: var(--fs-md); line-height: 1.74; }
.cta-actions { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 12px; }
.cta-actions .button-primary { color: #04281a; background: linear-gradient(135deg, #a8f7cd, #4fe3a4); box-shadow: 0 16px 34px -12px rgba(79, 227, 164, .5); }
.cta-actions .button-ghost { color: #eafff4; border-color: rgba(255, 255, 255, .26); background: rgba(255, 255, 255, .07); box-shadow: none; backdrop-filter: blur(6px); }
.cta-actions .button-ghost:hover { color: #fff; border-color: rgba(255, 255, 255, .5); background: rgba(255, 255, 255, .14); }

.landing-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner { display: grid; padding: 40px 0 30px; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 28px 48px; }
.footer-brand { display: flex; align-items: flex-start; gap: 13px; }
.footer-brand img { width: 34px; height: 34px; border-radius: 10px; }
.footer-brand strong { display: block; color: var(--text); font-family: var(--font-display); font-size: var(--fs-md); font-weight: 700; letter-spacing: -.02em; }
.footer-brand span { display: block; margin-top: 3px; color: var(--text-3); font-size: var(--fs-sm); }
.footer-links { display: flex; flex-wrap: wrap; align-content: start; justify-content: flex-end; gap: 6px 8px; }
.footer-links a { padding: 7px 12px; border-radius: var(--radius-xs); color: var(--text-2); font-size: var(--fs-sm); font-weight: 550; transition: color var(--dur-1) ease, background var(--dur-1) ease; }
.footer-links a:hover { color: var(--brand-text); background: var(--brand-tint-2); }
.footer-note { display: flex; padding-top: 22px; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; border-top: 1px solid var(--border); color: var(--text-4); font-size: var(--fs-xs); grid-column: 1 / -1; }

/* 进场动画 */
[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 80ms);
}
[data-js="on"] [data-reveal].is-visible { opacity: 1; transform: none; }

/* 5. 功能页 -------------------------------------------------------------- */
body.app-page { overflow: hidden; }
.app-shell { display: grid; width: 100%; height: 100vh; height: 100dvh; grid-template-columns: var(--sidebar-width) minmax(0, 1fr); }

.sidebar {
  position: relative;
  z-index: 40;
  display: flex;
  min-height: 0;
  flex-direction: column;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--surface);
}
.sidebar-header { display: flex; padding: 22px 20px 18px; align-items: center; justify-content: space-between; gap: 10px; }
.sidebar .brand-copy strong { font-size: var(--fs-md); }
.sidebar-intro { margin: 0; padding: 0 20px 20px; border-bottom: 1px solid var(--border); color: var(--text-3); font-size: var(--fs-sm); line-height: 1.7; }
.side-nav { display: grid; padding: 18px 12px 20px; gap: 2px; }
.nav-label { display: block; margin: 0 10px 10px; color: var(--text-4); font-size: var(--fs-2xs); font-weight: 650; letter-spacing: .13em; text-transform: uppercase; }
.side-nav a {
  position: relative;
  display: grid;
  min-height: 38px;
  padding: 0 11px;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-size: var(--fs-sm);
  transition: color var(--dur-1) ease, background var(--dur-1) ease;
}
.side-nav a:hover { color: var(--text); background: var(--surface-3); }
.side-nav a.active { color: var(--brand-text); background: var(--brand-tint); font-weight: 620; }
.side-nav a.active::before { content: ""; position: absolute; top: 8px; bottom: 8px; left: 0; width: 2.5px; border-radius: 0 3px 3px 0; background: var(--brand); }
.nav-icon {
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-3);
  background: var(--surface-2);
  transition: color var(--dur-2) ease, border-color var(--dur-2) ease, background var(--dur-2) ease;
}
.nav-icon svg { width: 14px; height: 14px; }
.side-nav a:hover .nav-icon,
.nav-parent:hover .nav-icon { color: var(--text-2); border-color: var(--border-2); }
.side-nav a.active .nav-icon,
.nav-parent.active .nav-icon {
  color: var(--brand-text);
  border-color: color-mix(in srgb, var(--brand) 32%, var(--border));
  background: var(--brand-tint);
}
.sidebar-footer { margin-top: auto; padding: 16px 20px 20px; border-top: 1px solid var(--border); background: var(--surface-2); }
.availability { display: flex; align-items: center; gap: 8px; color: var(--text-2); font-size: var(--fs-xs); font-weight: 620; }
.availability span { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 3px var(--brand-tint); }
.sidebar-footer p { margin: 8px 0 0; color: var(--text-4); font-size: var(--fs-2xs); line-height: 1.6; }
.icon-button.sidebar-close { display: none; }
.sidebar-backdrop { display: none; }

.nav-group { min-width: 0; }
.nav-parent {
  position: relative;
  display: grid;
  min-height: 38px;
  padding: 0 11px;
  grid-template-columns: 30px minmax(0, 1fr) auto 16px;
  align-items: center;
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-size: var(--fs-sm);
  cursor: pointer;
  list-style: none;
  transition: color var(--dur-1) ease, background var(--dur-1) ease;
}
.nav-parent::-webkit-details-marker { display: none; }
.nav-parent:hover { color: var(--text); background: var(--surface-3); }
.nav-parent.active { color: var(--brand-text); background: var(--brand-tint); font-weight: 620; }
.nav-parent.active::before { content: ""; position: absolute; top: 8px; bottom: 8px; left: 0; width: 2.5px; border-radius: 0 3px 3px 0; background: var(--brand); }
.nav-parent small { color: var(--text-4); font-family: var(--font-mono); font-size: var(--fs-2xs); font-variant-numeric: tabular-nums; }
.nav-chevron { width: 13px; height: 13px; color: var(--text-4); transition: transform var(--dur-2) var(--ease-out); }
.nav-group[open] .nav-chevron { transform: rotate(90deg); }
.nav-children { display: grid; padding: 4px 0 8px 22px; gap: 1px; border-left: 1px solid var(--border); margin-left: 20px; }
.side-nav .nav-child { display: block; min-height: 31px; padding: 7px 11px; border-radius: var(--radius-xs); color: var(--text-3); font-size: var(--fs-sm); line-height: 1.45; }
.side-nav .nav-child:hover { color: var(--text); background: var(--surface-3); }
.side-nav .nav-child.active { color: var(--brand-text); background: var(--brand-tint-2); font-weight: 600; }
.side-nav .nav-child.active::before { display: none; }
.guide-nav-link { margin-top: 8px; }

.workspace { position: relative; display: grid; min-width: 0; min-height: 0; grid-template-rows: 60px minmax(0, 1fr); }
.topbar { position: relative; z-index: 20; display: flex; padding: 0 32px; align-items: center; gap: 16px; border-bottom: 1px solid var(--border); background: var(--surface-glass); backdrop-filter: blur(18px) saturate(160%); }
.topbar .scroll-progress { position: absolute; inset: auto 0 -1px; z-index: 30; }
.topbar-path { display: flex; min-width: 0; align-items: center; gap: 10px; color: var(--text-3); font-size: var(--fs-sm); }
.topbar-path a { color: var(--text-2); font-weight: 550; transition: color var(--dur-1) ease; }
.topbar-path a:hover { color: var(--brand-text); }
.topbar-path b { color: var(--border-2); font-weight: 400; }
.topbar-path strong { overflow: hidden; color: var(--text); font-weight: 640; text-overflow: ellipsis; white-space: nowrap; }
.topbar-actions { display: flex; margin-left: auto; align-items: center; gap: 10px; }
.topbar-count { padding: 6px 11px; border: 1px solid var(--border); border-radius: 999px; color: var(--text-2); background: var(--surface-2); font-size: var(--fs-2xs); font-weight: 600; font-variant-numeric: tabular-nums; }
.icon-button.menu-button { display: none; }

.main-scroll { min-width: 0; min-height: 0; overflow-y: auto; scroll-behavior: smooth; scroll-padding-top: 96px; scrollbar-gutter: stable; }
.content-wrap { width: min(calc(100% - 88px), var(--content-width)); margin-left: clamp(32px, 4vw, 60px); margin-right: auto; }

.page-intro { display: grid; padding: 46px 0 34px; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 34px; scroll-margin-top: 24px; }
.page-intro-copy { max-width: 640px; }
.page-intro h1 { margin: 0; color: var(--text); font-size: var(--fs-3xl); font-weight: 720; letter-spacing: -.038em; }
.page-intro p { margin: 14px 0 0; color: var(--text-3); font-size: var(--fs-md); line-height: 1.78; }
.page-intro .button-ghost { margin-top: 22px; }
.page-intro .button-ghost svg { width: 15px; height: 15px; }
.page-intro .button-ghost:hover svg { transform: translateX(-3px); }
.page-intro-stats { display: flex; gap: 10px; }
.page-intro-stats div { min-width: 104px; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); box-shadow: var(--shadow-xs); }
.page-intro-stats dt { color: var(--text-4); font-size: var(--fs-2xs); font-weight: 620; letter-spacing: .1em; text-transform: uppercase; }
.page-intro-stats dd { margin-top: 5px; color: var(--text); font-family: var(--font-display); font-size: var(--fs-xl); font-weight: 700; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }

.catalog { padding: 0 0 8px; }
.catalog-tools {
  position: sticky;
  top: 0;
  z-index: 12;
  display: grid;
  margin: 0 0 20px;
  padding: 11px;
  grid-template-columns: minmax(184px, 224px) minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-glass);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(18px) saturate(170%);
}
.search-box { display: flex; height: 42px; padding: 0 12px; align-items: center; gap: 10px; border: 1px solid var(--border); border-radius: var(--radius-xs); background: var(--surface); transition: border-color var(--dur-1) ease, box-shadow var(--dur-1) ease; }
.search-box:focus-within { border-color: var(--brand); box-shadow: var(--ring); }
.search-box svg { width: 16px; height: 16px; flex: 0 0 auto; color: var(--text-4); }
.search-box input { width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; font-size: var(--fs-md); }
.search-box input::placeholder { color: var(--text-4); }
.search-box kbd { padding: 2px 7px; border: 1px solid var(--border); border-radius: 5px; color: var(--text-4); background: var(--surface-2); font-size: var(--fs-2xs); }
.filter-strip { display: flex; min-width: 0; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.filter-strip::-webkit-scrollbar { display: none; }
.filter-strip { gap: 3px; }
.filter-strip button { min-height: 34px; padding: 0 9px; flex: 0 0 auto; border: 1px solid transparent; border-radius: 999px; color: var(--text-2); background: transparent; font-size: var(--fs-sm); font-weight: 550; transition: color var(--dur-1) ease, border-color var(--dur-1) ease, background var(--dur-1) ease; }
.filter-strip button:hover { color: var(--text); background: var(--surface-3); }
.filter-strip button.active { color: var(--on-brand); border-color: transparent; background: var(--grad-brand); box-shadow: var(--shadow-brand); font-weight: 640; }
.result-count { margin: 0; color: var(--text-4); font-size: var(--fs-2xs); font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }

.api-groups { display: grid; gap: 18px; }
.api-group { overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--surface); box-shadow: var(--shadow-xs); scroll-margin-top: 88px; }
.api-group > header { display: grid; min-height: 76px; padding: 18px 22px; grid-template-columns: minmax(170px, .72fr) minmax(240px, 1.28fr) auto; align-items: center; gap: 24px; border-bottom: 1px solid var(--border); background: linear-gradient(140deg, var(--surface-2), var(--surface)); }
.api-group > header > div { display: flex; min-width: 0; align-items: center; gap: 11px; }
.group-icon {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 11px;
  color: var(--brand-text);
  background: linear-gradient(160deg, var(--brand-tint), transparent);
  transition: border-color var(--dur-2) ease, transform var(--dur-2) var(--ease-out);
}
.group-icon svg { width: 18px; height: 18px; }
.api-group:hover .group-icon { border-color: color-mix(in srgb, var(--brand) 34%, var(--border)); transform: translateY(-1px); }
.group-number { color: var(--text-4); font-family: var(--font-mono); font-size: var(--fs-2xs); font-weight: 650; letter-spacing: .06em; }
.api-group h3 { margin: 0; color: var(--text); font-family: var(--font-display); font-size: var(--fs-lg); font-weight: 700; letter-spacing: -.026em; }
.api-group header p { margin: 0; color: var(--text-3); font-size: var(--fs-sm); }
.group-count { padding: 4px 10px; border: 1px solid var(--border); border-radius: 999px; color: var(--text-3); background: var(--surface); font-size: var(--fs-2xs); font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }

.api-list { margin: 0; padding: 0; list-style: none; }
.api-list li {
  position: relative;
  display: grid;
  min-height: 58px;
  padding: 14px 22px;
  grid-template-columns: minmax(200px, .7fr) minmax(0, 1.3fr);
  align-items: center;
  gap: 22px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 96px;
  transition: background var(--dur-1) ease, padding-left var(--dur-2) var(--ease-out);
}
.api-list li::before { content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 2px; background: var(--brand); opacity: 0; transition: opacity var(--dur-1) ease; }
.api-list li:last-child { border-bottom: 0; }
.api-list li:hover { padding-left: 26px; background: var(--brand-tint-2); }
.api-list li:hover::before { opacity: 1; }
.feature-name { color: var(--text); font-size: var(--fs-md); font-weight: 620; letter-spacing: -.014em; overflow-wrap: anywhere; }
.api-list p { margin: 0; color: var(--text-3); font-size: var(--fs-sm); line-height: 1.6; overflow-wrap: anywhere; }
.event-list li { padding-right: 84px; }
.kind-badge { position: absolute; top: 50%; right: 22px; padding: 3px 9px; border-radius: 999px; color: var(--brand-text); background: var(--brand-tint); font-size: var(--fs-2xs); font-weight: 650; transform: translateY(-50%); }
.kind-badge.neutral { color: var(--text-3); background: var(--surface-3); }
.api-list li:target,
.api-list li.is-targeted { padding-left: 26px; background: var(--brand-tint); }
.api-list li:target::before,
.api-list li.is-targeted::before { opacity: 1; }
.api-list li:focus-visible { outline-offset: -3px; }

.empty-state { padding: 68px 24px; border: 1px dashed var(--border-2); border-radius: var(--radius-md); background: var(--surface); text-align: center; }
.empty-state strong { color: var(--text); font-family: var(--font-display); font-size: var(--fs-lg); font-weight: 700; }
.empty-state p { margin: 8px 0 20px; color: var(--text-3); font-size: var(--fs-md); }
.empty-state button { min-height: 38px; padding: 0 16px; border: 1px solid var(--border-2); border-radius: var(--radius-xs); color: var(--text); background: var(--surface); font-size: var(--fs-sm); font-weight: 600; transition: color var(--dur-1) ease, border-color var(--dur-1) ease, background var(--dur-1) ease; }
.empty-state button:hover { color: var(--brand-text); border-color: var(--brand); background: var(--brand-tint-2); }

.guide-section > header { min-height: 74px; grid-template-columns: minmax(210px, .72fr) minmax(0, 1.28fr); border-bottom: 0; }
.guide-contact { color: var(--text-3); font-size: var(--fs-sm); }
.guide-contact a { display: inline-flex; margin-left: 5px; padding: 4px 11px; align-items: center; border-radius: 999px; color: var(--on-brand); background: var(--grad-brand); box-shadow: var(--shadow-brand); font-size: var(--fs-xs); font-weight: 640; transition: transform var(--dur-1) var(--ease-out); }
.guide-contact a:hover { transform: translateY(-1px); }

.page-footer { display: flex; margin-top: 56px; padding: 26px 0 36px; align-items: center; justify-content: space-between; gap: 32px; border-top: 1px solid var(--border); }
.page-footer > div { display: flex; align-items: baseline; gap: 9px; }
.page-footer strong { color: var(--text-2); font-size: var(--fs-sm); font-weight: 650; }
.page-footer span, .page-footer p { color: var(--text-4); font-size: var(--fs-xs); }
.page-footer p { margin: 0; text-align: right; }

/* 6. 响应式 -------------------------------------------------------------- */
/* 整屏模式下的紧凑变体，保证单屏容纳 */
@media (min-width: 901px) and (min-height: 800px) {
  .snap-section .section-heading { margin-bottom: 20px; }
  .snap-section .module-grid a { min-height: 0; padding: 16px 17px; }
  .snap-section .module-icon { width: 34px; height: 34px; border-radius: 10px; }
  .snap-section .module-icon svg { width: 17px; height: 17px; }
  .snap-section .module-grid strong { margin-top: 11px; font-size: var(--fs-md); }
  .snap-section .module-grid p {
    display: -webkit-box;
    margin-top: 5px;
    overflow: hidden;
    font-size: var(--fs-xs);
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
  }
  .snap-section .module-meta { padding-top: 11px; }
  .snap-section .module-more { min-height: 42px; margin-top: 16px; }
  .snap-section .why-item { padding: 22px 24px 26px; }
  .snap-section .why-key { margin-bottom: 14px; }
  .snap-section .why-intro { padding: 22px 26px; }
  .snap-section .cta-inner { padding: clamp(42px, 4.4vw, 66px); }
}

@media (max-width: 900px), (max-height: 799px) {
  html[data-page="landing"] { scroll-snap-type: none; scroll-padding-top: calc(var(--nav-h) + 20px); }
  html[data-page="landing"] .snap-section { scroll-margin-top: calc(var(--nav-h) + 16px); }
  .snap-section { min-height: 0; padding-block: clamp(38px, 7vw, 62px); scroll-snap-align: none; scroll-snap-stop: normal; }
  .landing-hero { padding-top: calc(var(--nav-h) + 30px); padding-bottom: clamp(38px, 7vw, 62px); }
  .landing-footer { scroll-snap-align: none; }
  .snap-dots, .scroll-hint { display: none; }
}

@media (max-width: 1240px) {
  .module-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1180px) {
  .catalog-tools { grid-template-columns: minmax(210px, 250px) minmax(0, 1fr); }
  .result-count { display: none; }
}

@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero-panel { max-width: 520px; }
  .section-heading { grid-template-columns: minmax(0, 1fr); }
  .why-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cta-inner { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  body.sidebar-open { overflow: hidden; }
  .app-shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: min(90vw, 330px); transform: translateX(-102%); box-shadow: var(--shadow-lg); transition: transform var(--dur-2) var(--ease-out); }
  body.sidebar-open .sidebar { transform: none; }
  .icon-button.sidebar-close { display: grid; }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 35; display: block; width: 100%; height: 100%; padding: 0; border: 0; opacity: 0; visibility: hidden; background: rgba(4, 12, 8, .5); backdrop-filter: blur(2px); transition: opacity var(--dur-2) ease, visibility var(--dur-2) ease; }
  body.sidebar-open .sidebar-backdrop { opacity: 1; visibility: visible; }
  .icon-button.menu-button { display: grid; }
  .workspace { grid-column: 1; }
  .topbar { padding-inline: 18px; }
  .content-wrap { width: min(calc(100% - 56px), var(--content-width)); margin-inline: auto; }
  .page-intro { grid-template-columns: minmax(0, 1fr); align-items: start; gap: 26px; }
}

@media (max-width: 860px) {
  .landing-wrap { width: min(100% - 34px, var(--wrap)); }
  .nav-menu {
    position: absolute;
    top: calc(var(--nav-h) - 6px);
    right: 17px;
    left: 17px;
    display: grid;
    margin: 0;
    padding: 10px;
    gap: 2px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(.99);
    transform-origin: 100% 0;
    transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-out), visibility var(--dur-2);
  }
  body.nav-open .nav-menu { opacity: 1; visibility: visible; transform: none; }
  .nav-menu a { padding: 11px 13px; font-size: var(--fs-base); }
  .nav-menu a::after { display: none; }
  .nav-toggle { display: grid; }
  .nav-cta { display: none; }
  .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 760px) {
  .hero-lead { font-size: var(--fs-base); }
  .hero-actions .button-lg { flex: 1 1 220px; }
  .hero-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-stats div { padding: 0 14px; }
  .hero-panel { padding: 20px; }
  .hero-panel-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .why-intro { padding: 24px 22px; }
  .why-intro p { font-size: var(--fs-base); }
  .why-list { grid-template-columns: 1fr; }
  .why-item { padding: 24px 22px; }
  .cta-inner { padding: 28px 22px; }
  .cta-actions .button-lg { flex: 1 1 200px; }

  .workspace { grid-template-rows: 56px minmax(0, 1fr); }
  .topbar { padding-inline: 14px; }
  .topbar-count { display: none; }
  .content-wrap { width: min(calc(100% - 32px), var(--content-width)); max-width: calc(100% - 32px); margin-inline: auto; }
  .page-intro { padding: 32px 0 26px; }
  .page-intro-stats { flex-wrap: wrap; }
  .page-intro-stats div { min-width: 92px; flex: 1 1 92px; }
  .catalog-tools { top: 0; grid-template-columns: 1fr; gap: 8px; }
  .result-count { display: block; padding: 0 2px 2px; }
  .api-groups { gap: 14px; }
  .api-group > header { min-height: 0; padding: 16px; grid-template-columns: 1fr auto; gap: 8px 14px; }
  .api-group > header > div { grid-column: 1; }
  .api-group header p { grid-column: 1 / -1; grid-row: 2; }
  .group-count { grid-column: 2; grid-row: 1; }
  .api-list li { min-height: 68px; padding: 14px 16px; grid-template-columns: minmax(0, 1fr); gap: 4px; scroll-margin-top: 152px; }
  .api-list li:hover, .api-list li:target, .api-list li.is-targeted { padding-left: 20px; }
  .event-list li { padding-right: 70px; }
  .kind-badge { top: 16px; right: 16px; transform: none; }
  .guide-section > header { grid-template-columns: 1fr; }
  .guide-section .guide-contact { grid-column: 1; grid-row: 2; }
  .page-footer { align-items: flex-start; flex-direction: column; gap: 8px; }
  .page-footer p { text-align: left; }
  .side-nav .nav-child { min-height: 36px; padding-block: 9px; }
}

@media (max-width: 520px) {
  .brand-copy small { display: none; }
  .hero-panel-live { display: none; }
  .hero-title { font-size: clamp(32px, 9.4vw, 44px); letter-spacing: -.036em; }
  .hero-stats dd { font-size: var(--fs-lg); }
  .hero-stats dd span { display: block; margin-left: 0; }
  .module-grid { grid-template-columns: 1fr; }
  .module-grid a { min-height: 0; }
  .hero-panel-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .topbar-path > a, .topbar-path b { display: none; }
  .page-intro-stats div { min-width: 0; }
  .api-group > header { padding: 15px 14px; }
  .api-list li { padding-inline: 14px; }
  .event-list li { padding-right: 66px; }
}

@media (prefers-reduced-motion: reduce) {
  html, .main-scroll { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  [data-js="on"] [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  body, body.app-page { overflow: visible; background: #fff; }
  .app-shell { display: block; height: auto; }
  .sidebar, .topbar, .catalog-tools, .page-footer, .site-nav, .cta-band, .landing-footer, .scroll-progress, .hero-canvas { display: none !important; }
  .main-scroll { overflow: visible; }
  .content-wrap { width: 100%; margin: 0; }
  .page-intro { padding-top: 20px; }
  .why-section, .api-group, .module-grid a, .hero-panel { break-inside: avoid; box-shadow: none; }
}