/* Bridge V0.8.0 site skin — Sunstone2030renew baseline (pure black + terracotta),
   liquid glass header, spring-disciplined motion. DM Sans self-hosted. */

@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 100 1000;
  font-display: swap;
  src: url("assets/fonts/dm-sans-latin-wght-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("assets/fonts/inter-latin-wght-normal.woff2") format("woff2");
}

:root {
  color-scheme: dark;
  --bg: #000000;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.17);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.62);
  --faint: rgba(255, 255, 255, 0.42);
  --accent: #e0885f;
  --accent-hover: #e99b77;
  --accent-ink: #e0885f;
  --accent-soft: rgba(224, 136, 95, 0.15);
  --btn-primary-text: #241309;
  --gold: #d9a45b;

  --card-fill: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.09);
  --card-hi: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 12px 32px rgba(0, 0, 0, 0.38);

  --glass-fill: rgba(10, 8, 6, 0.72);
  --glass-border: rgba(255, 255, 255, 0.09);

  --radius: 10px;
  --r-panel: 16px;
  --r-pill: 999px;

  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --t-fast: 140ms;

  font-family: "DM Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

::selection {
  background: rgba(224, 136, 95, 0.3);
}

:focus-visible {
  outline: 3px solid rgba(224, 136, 95, 0.4);
  outline-offset: 2px;
}

/* 顶部 chrome：液态玻璃 Regular */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 28px;
  background: var(--glass-fill);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: blur(26px) saturate(180%);
  -webkit-backdrop-filter: blur(26px) saturate(180%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
}

.brand img {
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.9rem;
  transition: color var(--t-fast) ease;
}

.site-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

.lang-switch {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
}

.lang-switch button {
  min-height: 30px;
  padding: 0 13px;
  border: 0;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--t-fast) ease, background var(--t-fast) ease;
}

.lang-switch button:hover {
  color: var(--text);
}

.lang-switch button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--btn-primary-text);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  transition: background var(--t-fast) ease, border-color var(--t-fast) ease, transform var(--t-fast) var(--ease-out);
}

.button:hover {
  text-decoration: none;
}

.button:active {
  transform: scale(0.97);
}

.button-small {
  min-height: 36px;
  padding: 0 14px;
  font-size: 0.9rem;
}

.button-primary {
  background: var(--accent);
  border-color: transparent;
  color: var(--btn-primary-text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-secondary {
  background: var(--panel-strong);
}

.button-secondary:hover {
  border-color: var(--line-strong);
}

/* Hero — Artistic Asymmetry：文案左置，截图自右下交叠浮入 */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  align-items: center;
  gap: 32px;
  max-width: 1160px;
  margin: 0 auto;
  padding: 120px 28px 96px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -30% auto;
  height: 130%;
  background: radial-gradient(46% 52% at 30% 30%, rgba(224, 136, 95, 0.09), transparent 70%);
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-ink);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(3.5rem, 7vw, 5.5rem);
  font-weight: 780;
}

h2 {
  font-size: clamp(1.7rem, 2.6vw, 2.2rem);
  font-weight: 720;
}

h3 {
  font-size: 1.08rem;
  font-weight: 650;
}

.lede {
  margin: 20px 0 0;
  color: var(--text);
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.3;
}

.hero-text {
  max-width: 56ch;
  margin: 18px 0 0;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-visual {
  position: relative;
  z-index: 1;
  width: min(300px, 82vw);
  margin: 0 0 -56px auto;
  padding: 10px;
  border: 1px solid var(--card-border);
  border-radius: 46px;
  background: var(--card-fill);
  box-shadow: var(--card-hi), 0 40px 100px rgba(0, 0, 0, 0.6);
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 36px;
}

/* 运行名词条（专有名词，无需 i18n） */
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 36s linear infinite;
}

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

.marquee-track span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.marquee-track span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

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

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 112px 28px;
}

.section-band {
  max-width: none;
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-band > * {
  max-width: 1160px;
  margin-left: auto;
  margin-right: auto;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
}

/* 特性卡：四件套 + hover 上浮 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  min-height: 170px;
  padding: 24px;
  background: var(--card-fill);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-hi), var(--card-shadow);
  transition: transform var(--t-fast) var(--ease-out), border-color var(--t-fast) ease;
}

.feature-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.feature-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.diagram {
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--card-border);
  border-radius: var(--r-panel);
  box-shadow: var(--card-hi), var(--card-shadow);
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.section-note {
  margin: 26px 0 0;
  color: var(--faint);
  font-size: 0.92rem;
  text-align: center;
}

.section-note code {
  padding: 2px 6px;
  color: var(--text);
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 5px;
  font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85rem;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.security-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 112px;
  padding: 22px;
  background: var(--card-fill);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-hi), var(--card-shadow);
}

.security-item strong {
  color: var(--text);
  font-size: 0.98rem;
}

.security-item span {
  color: var(--muted);
  font-size: 0.92rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.download-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 130px;
  padding: 24px;
  background: var(--card-fill);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-hi), var(--card-shadow);
  color: var(--text);
  transition: transform var(--t-fast) var(--ease-out), border-color var(--t-fast) ease;
}

.download-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--card-border));
  text-decoration: none;
  transform: translateY(-2px);
}

.download-card strong {
  font-size: 1.05rem;
}

.download-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1160px;
  margin: 0 auto;
  padding: 32px 28px;
  color: var(--faint);
  font-size: 0.9rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner nav {
  display: flex;
  gap: 18px;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 72px 20px 64px;
  }

  .hero-visual {
    margin-right: 0;
    margin-bottom: 0;
  }

  .feature-grid,
  .security-grid,
  .download-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section {
    padding: 72px 20px;
  }
}

@media (max-width: 620px) {
  .site-header {
    padding: 12px 16px;
  }

  .site-nav {
    display: none;
  }

  h1 {
    font-size: 3rem;
  }

  .lede {
    font-size: 1.2rem;
  }

  .feature-grid,
  .security-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .marquee-track {
    animation: none;
    flex-wrap: wrap;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}