/* =========================================================================
   写字台 · 官网样式
   设计依据：DESIGN.md（Apple 风格：明暗瓦片节奏 + 单一 Action Blue）
   ========================================================================= */

/* --- Tokens ------------------------------------------------------------ */
:root {
  /* Color */
  --primary: #0066cc;
  --primary-focus: #0071e3;
  --primary-on-dark: #2997ff;
  --ink: #1d1d1f;
  --ink-muted-80: #333333;
  --ink-muted-48: #7a7a7a;
  --hairline: #e0e0e0;
  --divider-soft: #f0f0f0;
  --canvas: #ffffff;
  --canvas-parchment: #f5f5f7;
  --surface-pearl: #fafafc;
  --surface-tile-1: #272729;
  --surface-tile-2: #2a2a2c;
  --surface-tile-3: #252527;
  --surface-black: #000000;
  --body-muted: #cccccc;
  --on-primary: #ffffff;

  /* Spacing */
  --sp-xxs: 4px;
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-md: 17px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-xxl: 48px;
  --sp-section: 80px;

  /* Radius */
  --r-none: 0;
  --r-sm: 8px;
  --r-md: 11px;
  --r-lg: 18px;
  --r-pill: 9999px;
  --r-full: 9999px;

  /* Type */
  --font-display: "SF Pro Display", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-text: "SF Pro Text", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Chrome */
  --nav-h: 44px;
  --subnav-h: 52px;
  --product-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;
}

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

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

body {
  margin: 0;
  padding-top: var(--nav-h);
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

img { max-width: 100%; height: auto; display: block; border: 0; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, p, figure, blockquote { margin: 0; }

:focus-visible {
  outline: 2px solid var(--primary-focus);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--nav-h);
  z-index: 100;
  background: var(--canvas);
  color: var(--primary);
  padding: 10px 16px;
  border-radius: var(--r-sm);
}
.skip-link:focus { left: 12px; }

/* --- Typography -------------------------------------------------------- */
.eyebrow {
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink-muted-48);
  text-transform: none;
  margin-bottom: var(--sp-md);
}
.eyebrow--dark { color: var(--body-muted); }

.display-lg {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.tagline {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
}

.lead {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.196px;
}
.lead--dim { color: var(--body-muted); }
.lead-airy {
  font-family: var(--font-text);
  font-size: 24px;
  font-weight: 300;
  line-height: 1.5;
  letter-spacing: 0;
}

.muted-on-dark {
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--body-muted);
}

.text-link {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--primary);
}
.text-link--on-dark { color: var(--primary-on-dark); }
.text-link--lg { font-size: 21px; }

/* --- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-xs);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  min-height: 44px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  text-decoration: none !important;
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.95); }
.btn:focus-visible { outline: 2px solid var(--primary-focus); outline-offset: 3px; }

.btn--primary { background: var(--primary); color: var(--on-primary); }
.btn--primary:hover { background: var(--primary-focus); }

.btn--ghost {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn--ghost:hover { background: rgba(0, 102, 204, 0.06); }

.btn--sm {
  min-height: 34px;
  font-size: 14px;
  padding: 8px 16px;
  line-height: 1.29;
}

/* --- Global nav -------------------------------------------------------- */
.global-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  background: var(--surface-black);
  color: var(--on-primary);
}
.global-nav__inner {
  height: var(--nav-h);
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
}
.global-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  color: var(--on-primary);
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.224px;
  text-decoration: none !important;
  opacity: 0.92;
}
.global-nav__brand:hover { opacity: 1; }
.global-nav__mark {
  width: 20px;
  height: 20px;
  border-radius: 5px;
}
.global-nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
  margin: 0 auto;
}
.global-nav__links a {
  font-family: var(--font-text);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.12px;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
  padding: 6px 0;
  transition: color 0.18s ease;
}
.global-nav__links a:hover,
.global-nav__links a.is-active { color: #ffffff; }

.global-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  margin-left: auto;
}
.global-nav__cta {
  font-size: 12px;
  line-height: 1;
  letter-spacing: -0.12px;
  color: #ffffff;
  background: var(--primary);
  padding: 8px 15px;
  border-radius: var(--r-pill);
  text-decoration: none;
  transition: transform 0.18s ease;
}
.global-nav__cta:active { transform: scale(0.95); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 1px;
  background: #ffffff;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-tray {
  background: var(--surface-black);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--sp-lg) var(--sp-xl) var(--sp-xxl);
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
}
.mobile-tray[hidden] { display: none; }
.mobile-tray__links { display: flex; flex-direction: column; }
.mobile-tray__links a {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
  color: #ffffff;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  text-decoration: none;
}
.mobile-tray__links a:last-child { border-bottom: 0; }

/* --- Sub nav ----------------------------------------------------------- */
.sub-nav {
  position: sticky;
  top: var(--nav-h);
  z-index: 50;
  background: rgba(245, 245, 247, 0.8);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.sub-nav__inner {
  height: var(--subnav-h);
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
}
.sub-nav__title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
  color: var(--ink);
}
.sub-nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
  margin-left: var(--sp-xxl);
}
.sub-nav__links a {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink);
  text-decoration: none;
  opacity: 0.82;
}
.sub-nav__links a:hover { opacity: 1; color: var(--primary); }
.sub-nav__cta { margin-left: auto; }

/* --- Tiles ------------------------------------------------------------- */
.tile {
  padding: var(--sp-section) 0;
  scroll-margin-top: calc(var(--nav-h) + var(--subnav-h));
}
.tile__inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
}
.tile--light { background: var(--canvas); color: var(--ink); }
.tile--parchment { background: var(--canvas-parchment); color: var(--ink); }
.tile--dark { background: var(--surface-tile-1); color: var(--on-primary); }
.tile--dark-2 { background: var(--surface-tile-2); }
.tile--dark-3 { background: var(--surface-tile-3); }

.tile__inner--split {
  max-width: 1200px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: var(--sp-xxl);
}
.tile__inner--split-reverse .split__text { order: 2; }
.tile__inner--split-reverse .split__media { order: 1; }
.tile__inner--narrow { max-width: 820px; text-align: center; }

/* --- Hero -------------------------------------------------------------- */
.hero { padding-top: var(--sp-xxl); text-align: center; }
.hero__title {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.28px;
  margin-bottom: var(--sp-md);
}
.hero__lead {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.196px;
  color: var(--ink);
}
.hero__sub {
  font-size: 21px;
  font-weight: 300;
  line-height: 1.5;
  color: var(--ink-muted-80);
  margin-top: var(--sp-sm);
}
.hero__actions {
  display: flex;
  justify-content: center;
  gap: var(--sp-md);
  margin-top: var(--sp-xl);
  flex-wrap: wrap;
}

.hero__shots {
  display: grid;
  grid-template-columns: 1fr 1.14fr 1fr;
  align-items: start;
  gap: var(--sp-lg);
  margin-top: var(--sp-section);
}
.shot {
  border-radius: 26px;
  overflow: hidden;
  background: var(--canvas);
  box-shadow: var(--product-shadow);
}
.shot--side { transform: translateY(28px); }
.shot--main { position: relative; z-index: 2; }
.shot figcaption {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--ink-muted-48);
  padding: var(--sp-md) var(--sp-sm) 14px;
}

/* --- Split media ------------------------------------------------------- */
.split__media {
  border-radius: 26px;
  overflow: hidden;
  background: var(--canvas);
  box-shadow: var(--product-shadow);
  max-width: 320px;
  width: 100%;
  justify-self: center;
}
.split__media--light { background: var(--canvas); }
.split__text { max-width: 560px; }
.split__text .lead,
.split__text .lead-airy { margin-top: var(--sp-lg); }

/* --- Feature pair ------------------------------------------------------ */
.feature-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-xl);
  margin-top: var(--sp-xxl);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: var(--sp-xl);
}
.feature-pair__title {
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.374px;
  margin-bottom: var(--sp-xs);
}
.tile--dark .feature-pair__title { color: #ffffff; }

/* --- Audience ---------------------------------------------------------- */
.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-xxl);
  margin-top: var(--sp-xxl);
}
.audience-item__index {
  display: block;
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.12px;
  color: var(--body-muted);
  margin-bottom: var(--sp-sm);
}
.audience-item .tagline { color: #ffffff; margin-bottom: var(--sp-sm); }

/* --- Quote ------------------------------------------------------------- */
.quote__text {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 600;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: #ffffff;
}
.quote__source {
  margin-top: var(--sp-xl);
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--body-muted);
}

/* --- Cards ------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
  margin-top: var(--sp-xxl);
}
.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
}
.card__glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--r-full);
  background: var(--canvas-parchment);
  color: var(--primary);
  margin-bottom: var(--sp-md);
}
.card__title {
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.374px;
  margin-bottom: var(--sp-xs);
}
.card__body {
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--ink-muted-80);
}

/* --- Download ---------------------------------------------------------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
  margin-top: var(--sp-xxl);
}
.download-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-sm);
}
.download-item__label {
  font-size: 12px;
  line-height: 1;
  letter-spacing: -0.12px;
  color: var(--body-muted);
}
.download-item .tagline { color: #ffffff; }
.download-item .btn { margin-top: auto; }

/* --- APK 直链 ---------------------------------------------------------- */
.apk {
  margin-top: var(--sp-xxl);
  padding-top: var(--sp-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  scroll-margin-top: calc(var(--nav-h) + var(--subnav-h));
}
.apk__head { max-width: 620px; }
.apk__head .tagline { color: #ffffff; margin-bottom: var(--sp-sm); }
.apk__head strong { font-weight: 600; color: #ffffff; }

.apk__list {
  list-style: none;
  margin: var(--sp-xl) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-md);
}
.apk__item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
  height: 100%;
  padding: var(--sp-lg);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-lg);
  color: #ffffff;
  text-decoration: none;
  transition: background-color 0.18s ease, transform 0.18s ease;
}
.apk__item:hover {
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
}
.apk__item:active { transform: scale(0.98); }
.apk__abi {
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.374px;
}
.apk__meta {
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--body-muted);
}
.apk__cta {
  margin-top: var(--sp-md);
  font-size: 14px;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--primary-on-dark);
}
.apk__note {
  margin-top: var(--sp-md);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: -0.12px;
  color: var(--ink-muted-48);
}
.tile--dark .apk__note { color: rgba(204, 204, 204, 0.72); }

/* --- 开源卡片 ---------------------------------------------------------- */
.card--link { display: flex; flex-direction: column; }
.card__foot { margin-top: var(--sp-md); }
.card__foot .text-link { font-size: 17px; }

/* --- 部署 -------------------------------------------------------------- */
.deploy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-md);
  margin-top: var(--sp-xxl);
}
.deploy-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
  padding: var(--sp-lg);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-lg);
}
.deploy-item .tagline { color: #ffffff; }
.cmd,
.inline-code,
.snippet__code {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: 0;
}
.cmd {
  display: block;
  margin-top: auto;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  overflow-x: auto;
  white-space: nowrap;
}
.inline-code {
  padding: 2px 6px;
  border-radius: var(--r-xs);
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  word-break: break-all;
}

.quickstart {
  margin-top: var(--sp-xxl);
  padding-top: var(--sp-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}
.quickstart__title { color: #ffffff; margin-bottom: var(--sp-lg); }

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-md);
  counter-reset: step;
}
.step { display: flex; flex-direction: column; gap: var(--sp-xs); }
.step__label {
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--body-muted);
}

.snippet {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-sm);
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-sm);
  background: rgba(255, 255, 255, 0.06);
}
.snippet__code {
  flex: 1 1 auto;
  margin: 0;
  color: #ffffff;
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}
.copy-btn {
  flex: 0 0 auto;
  min-height: 32px;
  padding: 6px 12px;
  font-family: var(--font-text);
  font-size: 14px;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: #ffffff;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background-color 0.18s ease, transform 0.18s ease;
}
.copy-btn:hover { background: rgba(255, 255, 255, 0.1); }
.copy-btn:active { transform: scale(0.95); }
.copy-btn.is-copied { color: var(--primary-on-dark); border-color: var(--primary-on-dark); }

.deploy-notes {
  list-style: none;
  margin: var(--sp-lg) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-sm);
}
.deploy-notes li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: -0.224px;
  color: var(--body-muted);
}
.deploy-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.4);
}
.quickstart__more { margin-top: var(--sp-lg); }

/* --- Contact ----------------------------------------------------------- */
.contact-mail { margin-top: var(--sp-xl); }
.contact-qr {
  justify-self: center;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: var(--sp-lg);
  text-align: center;
  width: 260px;
}
.contact-qr img {
  border-radius: var(--r-sm);
  margin: 0 auto;
}
.contact-qr figcaption {
  margin-top: var(--sp-md);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink-muted-80);
}

/* --- Footer ------------------------------------------------------------ */
.footer {
  background: var(--canvas-parchment);
  color: var(--ink-muted-80);
  padding: 64px 0;
}
.footer__inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
}
.footer__cols {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.2fr 1fr;
  gap: var(--sp-xl);
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.231px;
  color: var(--ink);
}
.footer__brand img { border-radius: 6px; }
.footer__desc {
  margin-top: var(--sp-md);
  font-size: 14px;
  line-height: 1.43;
  letter-spacing: -0.224px;
  color: var(--ink-muted-48);
}
.footer__col { display: flex; flex-direction: column; }
.footer__heading {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink);
  margin-bottom: var(--sp-sm);
}
.footer__col a {
  font-size: 17px;
  font-weight: 400;
  line-height: 2.41;
  letter-spacing: 0;
  color: var(--ink-muted-80);
}
.footer__note {
  margin-top: var(--sp-xs);
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-muted-48);
}
.footer__legal {
  margin-top: var(--sp-xl);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
  justify-content: space-between;
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.12px;
  color: var(--ink-muted-48);
}
.footer__legal a { font-size: 12px; color: var(--ink-muted-48); }

/* --- Reveal ------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .global-nav__cta { transition: none; }
}

/* ============================ Responsive =============================== */

/* Small desktop */
@media (max-width: 1068px) {
  .display-lg { font-size: 40px; }
  .hero__title { font-size: 40px; }
  .hero__lead { font-size: 24px; }
  .lead { font-size: 24px; }
  .quote__text { font-size: 28px; }
  .tile__inner--split { gap: var(--sp-xl); }
  .split__media { max-width: 260px; }
  .card-grid { gap: var(--sp-md); }
  .card { padding: var(--sp-lg); }
  .deploy-grid { grid-template-columns: 1fr 1fr; }
  .footer__cols { grid-template-columns: 1fr 1fr; row-gap: var(--sp-xl); }
}

/* Tablet portrait / landscape */
@media (max-width: 833px) {
  :root { --sp-section: 64px; }

  .global-nav__inner { padding: 0 var(--sp-lg); }
  .global-nav__links { display: none; }
  .global-nav__cta { display: none; }
  .nav-toggle { display: flex; }

  .sub-nav__inner { padding: 0 var(--sp-lg); }
  .sub-nav__links { display: none; }

  .tile__inner { padding: 0 var(--sp-lg); }
  .tile__inner--split { grid-template-columns: 1fr; gap: var(--sp-xl); }
  .tile__inner--split-reverse .split__text,
  .tile__inner--split-reverse .split__media { order: 0; }
  .split__media { max-width: 280px; }

  .hero__shots { grid-template-columns: repeat(3, 1fr); gap: var(--sp-md); }
  .shot--side { transform: none; }

  .feature-pair { grid-template-columns: 1fr; gap: var(--sp-lg); }
  .audience-grid { grid-template-columns: 1fr; gap: var(--sp-xl); }
  .apk__list { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .download-item { align-items: stretch; }
  .deploy-grid { grid-template-columns: 1fr; }
  .snippet { flex-direction: column; align-items: stretch; }
  .copy-btn { align-self: flex-start; }
  .download-item .btn { align-self: flex-start; }
}

/* Phone */
@media (max-width: 640px) {
  :root { --sp-section: 48px; }

  body { font-size: 17px; }
  .tile__inner { padding: 0 var(--sp-md); }
  .global-nav__inner { padding: 0 var(--sp-md); }
  .sub-nav__inner { padding: 0 var(--sp-md); }
  .sub-nav__title { font-size: 17px; }

  .hero { padding-top: var(--sp-xl); }
  .hero__title { font-size: 34px; }
  .hero__lead { font-size: 21px; }
  .hero__sub { font-size: 17px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }

  .hero__shots {
    display: flex;
    gap: var(--sp-md);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    margin-left: calc(var(--sp-md) * -1);
    margin-right: calc(var(--sp-md) * -1);
    padding: 0 var(--sp-md) var(--sp-md);
  }
  .shot { flex: 0 0 68%; scroll-snap-align: center; }
  .shot--main { flex-basis: 74%; }

  .display-lg { font-size: 32px; }
  .lead-airy { font-size: 19px; }
  .quote__text { font-size: 24px; }
  .quote__br { display: none; }
  .split__media { max-width: 240px; }

  .footer { padding: var(--sp-xxl) 0; }
  .footer__inner { padding: 0 var(--sp-md); }
  .footer__cols { grid-template-columns: 1fr; row-gap: var(--sp-lg); }
  .footer__col a { line-height: 2; }
  .footer__legal { flex-direction: column; gap: var(--sp-xs); }
}

/* Small phone */
@media (max-width: 419px) {
  .hero__title { font-size: 28px; }
  .display-lg { font-size: 28px; }
  .quote__text { font-size: 21px; }
  .shot { flex: 0 0 82%; }
  .shot--main { flex-basis: 86%; }
}

/* Wide desktop */
@media (min-width: 1441px) {
  .tile__inner,
  .sub-nav__inner,
  .global-nav__inner,
  .footer__inner { max-width: 1440px; }
}

/* Print */
@media print {
  .global-nav, .sub-nav, .nav-toggle { display: none; }
  body { padding-top: 0; }
  .reveal { opacity: 1; transform: none; }
}