:root {
  --bg: #f6efe2;
  --bg-strong: #efe4cf;
  --surface: rgba(255, 252, 246, 0.8);
  --surface-strong: #fffaf1;
  --ink: #16213a;
  --muted: #52607a;
  --line: rgba(22, 33, 58, 0.12);
  --accent: #e85d3f;
  --accent-2: #0f8b8d;
  --accent-3: #f2b134;
  --success: #2e7d5b;
  --danger: #b04a35;
  --shadow: 0 24px 60px rgba(22, 33, 58, 0.12);
  --radius: 24px;
  --radius-sm: 16px;
  --container: 1180px;
  --font-display: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  --font-body: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, rgba(232, 93, 63, 0.18), transparent 25%),
    radial-gradient(circle at 0% 20%, rgba(15, 139, 141, 0.15), transparent 24%),
    linear-gradient(180deg, #fbf6ee 0%, var(--bg) 48%, #fff9ef 100%);
  font-family: var(--font-body);
  line-height: 1.6;
}

body.modal-open {
  overflow: hidden;
}

a {
  color: inherit;
}

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

.page-shell {
  overflow: hidden;
}

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(250, 244, 234, 0.72);
  border-bottom: 1px solid rgba(22, 33, 58, 0.08);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-3) 100%);
  box-shadow: 0 12px 26px rgba(232, 93, 63, 0.25);
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 999px;
}

.brand-mark::before {
  width: 18px;
  height: 5px;
  left: 12px;
  top: 13px;
}

.brand-mark::after {
  width: 10px;
  height: 10px;
  left: 16px;
  top: 20px;
}

.brand-copy strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: 0.04em;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-links a,
.lang-toggle button,
.copy-button,
.cta-button,
.ghost-button {
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.nav-links a {
  padding: 10px 16px;
  color: var(--muted);
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: rgba(22, 33, 58, 0.05);
  color: var(--ink);
}

.hero {
  padding: 72px 0 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(15, 139, 141, 0.1);
  color: var(--accent-2);
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero h1,
.section-title,
.doc-hero h1,
.privacy-hero h1 {
  margin: 18px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero h1 {
  font-size: clamp(3.2rem, 9vw, 6.2rem);
}

.hero p,
.section-intro,
.lead {
  max-width: 60ch;
  font-size: 1.1rem;
  color: var(--muted);
}

.hero-actions,
.download-actions,
.split-actions,
.prompt-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.cta-button,
.ghost-button,
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  border: 1px solid transparent;
  cursor: pointer;
}

.cta-button {
  background: var(--ink);
  color: #fff9f0;
  box-shadow: 0 14px 28px rgba(22, 33, 58, 0.18);
}

.cta-button:hover,
.ghost-button:hover,
.copy-button:hover,
.lang-toggle button:hover {
  transform: translateY(-1px);
}

.ghost-button {
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  border-color: rgba(22, 33, 58, 0.1);
}

.cta-button.is-secondary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-3) 100%);
  color: #fff7ef;
}

.cta-button.is-teal {
  background: var(--accent-2);
  color: #f4fffd;
}

.cta-button[aria-disabled="true"],
.ghost-button[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
}

a[data-coming-soon="true"] {
  cursor: pointer;
}

.hero-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-panel,
.card,
.feature-card,
.doc-card,
.download-card,
.privacy-card,
.toc,
.callout,
.code-block,
.steps-list li,
.api-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-panel {
  padding: 28px;
  border-radius: 34px;
  position: relative;
}

.panel-stack {
  display: grid;
  gap: 14px;
}

.mock-screen {
  padding: 18px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 251, 245, 0.98), rgba(245, 238, 224, 0.9));
  border: 1px solid rgba(22, 33, 58, 0.08);
}

.mock-screen header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  font-family: var(--font-display);
}

.metric-strip,
.chart-strip {
  display: grid;
  gap: 12px;
}

.metric-pill {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(22, 33, 58, 0.05);
  color: var(--ink);
  font-size: 0.95rem;
}

.mini-chart {
  height: 118px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(15, 139, 141, 0.08), transparent),
    linear-gradient(135deg, rgba(22, 33, 58, 0.04), rgba(22, 33, 58, 0.02));
  position: relative;
  overflow: hidden;
}

.mini-chart svg {
  position: absolute;
  inset: 10px;
  width: calc(100% - 20px);
  height: calc(100% - 20px);
}

.mini-inbox {
  display: grid;
  gap: 10px;
}

.mini-inbox .message {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(22, 33, 58, 0.08);
}

.message strong {
  font-family: var(--font-display);
  display: block;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(46, 125, 91, 0.12);
  color: var(--success);
  font-family: var(--font-display);
  font-size: 0.88rem;
}

.status-badge::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: currentColor;
  box-shadow: 0 0 0 8px rgba(46, 125, 91, 0.08);
}

.section {
  padding: 34px 0 42px;
}

.section-title {
  font-size: clamp(2.2rem, 6vw, 3.8rem);
}

.grid-3,
.feature-grid,
.downloads-grid,
.privacy-grid {
  display: grid;
  gap: 20px;
}

.grid-3,
.feature-grid,
.downloads-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.download-card,
.privacy-card,
.doc-card,
.api-card {
  padding: 24px;
  border-radius: var(--radius);
}

.feature-card h3,
.download-card h3,
.doc-card h3,
.api-card h3,
.privacy-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.stat {
  padding: 16px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(22, 33, 58, 0.08);
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
}

.split-layout {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 24px;
  align-items: start;
}

.check-list,
.steps-list,
.inline-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.inline-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
}

.check-list li::before,
.inline-list li::before {
  content: "•";
  position: absolute;
  left: 8px;
  top: 0;
  color: var(--accent);
  font-size: 1.2rem;
}

.steps-list {
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.steps-list li {
  counter-increment: step;
  padding: 18px 20px 18px 66px;
  border-radius: 22px;
  position: relative;
}

.steps-list li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--ink);
  color: #fff8ef;
  font-family: var(--font-display);
  font-size: 0.94rem;
}

.download-card .tag,
.doc-tag {
  display: inline-flex;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(22, 33, 58, 0.06);
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.doc-shell {
  padding: 56px 0 80px;
}

.doc-hero,
.privacy-hero {
  padding: 22px 0 18px;
}

.doc-hero h1,
.privacy-hero h1 {
  font-size: clamp(2.8rem, 8vw, 5rem);
}

.doc-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 98px;
  padding: 22px;
  border-radius: 26px;
}

.toc h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1rem;
}

.toc a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  text-decoration: none;
}

.lang-toggle {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: rgba(22, 33, 58, 0.07);
}

.lang-toggle button {
  padding: 10px 16px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.lang-toggle button.is-active {
  background: #fff7ed;
  color: var(--ink);
  box-shadow: 0 10px 24px rgba(22, 33, 58, 0.08);
}

[data-lang] {
  display: none;
}

html[data-active-lang="en"] [data-lang="en"],
html[data-active-lang="zh"] [data-lang="zh"] {
  display: block;
}

.doc-section {
  margin-bottom: 28px;
}

.doc-section > h2,
.doc-section > h3,
.doc-section > h4 {
  font-family: var(--font-display);
}

.doc-section > h2 {
  font-size: 2rem;
  margin-bottom: 14px;
}

.doc-section > h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.doc-card {
  margin-bottom: 18px;
}

.callout {
  padding: 18px 20px;
  border-radius: 20px;
  border-left: 5px solid var(--accent);
}

.callout.is-teal {
  border-left-color: var(--accent-2);
}

.code-block {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  margin: 16px 0;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 16px;
  background: rgba(22, 33, 58, 0.92);
  color: #fdf7ee;
  font-family: var(--font-display);
}

.copy-button {
  background: rgba(255, 255, 255, 0.08);
  color: inherit;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.copy-button.is-copied {
  background: rgba(46, 125, 91, 0.2);
  border-color: rgba(46, 125, 91, 0.35);
}

pre {
  margin: 0;
  padding: 18px;
  overflow: auto;
  background: #1d2438;
  color: #f5efe5;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.6;
}

code {
  font-family: var(--font-mono);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  font-family: var(--font-display);
}

.footer {
  padding: 34px 0 60px;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(22, 33, 58, 0.12);
  padding-top: 22px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  animation: reveal-up 0.7s ease forwards;
}

.coming-soon-modal[hidden] {
  display: none;
}

.coming-soon-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
}

.coming-soon-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(22, 33, 58, 0.52);
  backdrop-filter: blur(8px);
}

.coming-soon-dialog {
  position: relative;
  width: min(560px, calc(100% - 24px));
  margin: 12vh auto 0;
  padding: 28px;
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255, 251, 245, 0.98), rgba(246, 238, 222, 0.97));
  box-shadow: 0 30px 80px rgba(22, 33, 58, 0.24);
  border: 1px solid rgba(255, 255, 255, 0.65);
}

.coming-soon-dialog h2 {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1;
}

.coming-soon-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  font-size: 1.5rem;
  background: rgba(22, 33, 58, 0.08);
  color: var(--ink);
}

.reveal.delay-1 { animation-delay: 80ms; }
.reveal.delay-2 { animation-delay: 160ms; }
.reveal.delay-3 { animation-delay: 240ms; }
.reveal.delay-4 { animation-delay: 320ms; }

@keyframes reveal-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero-grid,
  .split-layout,
  .doc-layout {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .feature-grid,
  .downloads-grid,
  .privacy-grid,
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}

@media (max-width: 720px) {
  .topbar-inner {
    padding: 8px 0;
  }

  .nav-links {
    gap: 6px;
  }

  .nav-links a {
    padding: 8px 12px;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-panel,
  .feature-card,
  .download-card,
  .privacy-card,
  .doc-card,
  .api-card,
  .toc {
    padding: 20px;
  }

  pre {
    font-size: 0.88rem;
  }
}