:root {
  color-scheme: light;
  --ink: #10213b;
  --muted: #5b6b82;
  --line: #dce7f1;
  --paper: #f7fbff;
  --white: #ffffff;
  --blue: #0869ed;
  --blue-deep: #0754c7;
  --teal: #08bca7;
  --navy: #081b35;
  --shadow: 0 24px 70px rgba(17, 73, 127, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(8, 105, 237, 0.12), transparent 28rem),
    radial-gradient(circle at 90% 12%, rgba(8, 188, 167, 0.12), transparent 28rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--blue-deep);
}

img {
  max-width: 100%;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: var(--white);
  background: var(--navy);
  border-radius: 0.75rem;
}

.skip-link:focus {
  top: 1rem;
}

.site-header,
.site-main,
.site-footer {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 82px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 750;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.github-link {
  color: var(--muted);
  font-weight: 650;
  text-decoration: none;
}

.language-switcher {
  display: flex;
  padding: 0.2rem;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.language-switcher button {
  min-width: 44px;
  padding: 0.35rem 0.65rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 750;
  cursor: pointer;
}

.language-switcher button[aria-pressed="true"] {
  color: var(--white);
  background: var(--navy);
}

[data-language="en"] [data-lang="zh"],
[data-language="zh"] [data-lang="en"] {
  display: none !important;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.92fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  min-height: 650px;
  padding: 3.5rem 0 6.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 1.1rem;
  color: var(--blue-deep);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  background: var(--teal);
  border-radius: 50%;
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 720px;
  margin-bottom: 1.35rem;
  font-size: clamp(3.25rem, 7vw, 5.9rem);
}

h1 span {
  color: var(--blue);
}

.hero-copy > p:not(.eyebrow) {
  max-width: 620px;
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.26rem);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.78rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.82);
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  color: var(--white);
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 0 12px 30px rgba(8, 105, 237, 0.23);
}

.browser-demo {
  position: relative;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 1.8rem;
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
}

.browser-window {
  min-height: 410px;
  overflow: hidden;
  background: #eef4fa;
  border: 1px solid #d6e0eb;
  border-radius: 1.15rem;
}

.tab-strip {
  display: flex;
  align-items: end;
  gap: 0.4rem;
  min-height: 62px;
  padding: 0.8rem 0.8rem 0;
  background: #dfe8f2;
}

.traffic-lights {
  display: flex;
  align-self: center;
  gap: 5px;
  margin: 0 0.4rem 0.7rem 0;
}

.traffic-lights i {
  width: 8px;
  height: 8px;
  background: #aab8c7;
  border-radius: 50%;
}

.tab {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 145px;
  min-height: 42px;
  padding: 0.55rem 0.8rem;
  color: #59697b;
  background: #edf3f8;
  border-radius: 0.7rem 0.7rem 0 0;
  font-size: 0.78rem;
}

.tab.active {
  color: var(--ink);
  background: var(--white);
}

.tab img {
  width: 19px;
  height: 19px;
}

.address-row {
  padding: 0.7rem 1rem;
  background: var(--white);
  border-bottom: 1px solid #e5ebf1;
}

.address-bar {
  padding: 0.55rem 0.9rem;
  color: #67778b;
  background: #f1f5f9;
  border-radius: 999px;
  font-size: 0.77rem;
}

.page-canvas {
  position: relative;
  min-height: 300px;
  padding: 2rem;
  background: linear-gradient(135deg, #ffffff 0%, #edf7ff 100%);
}

.clipboard-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.6rem 0.8rem;
  color: var(--blue-deep);
  background: #e5f1ff;
  border-radius: 0.65rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
}

.context-menu {
  position: absolute;
  right: 1.4rem;
  top: 5.2rem;
  width: 250px;
  padding: 0.45rem;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid #dce4ec;
  border-radius: 0.8rem;
  box-shadow: 0 18px 38px rgba(20, 49, 81, 0.2);
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.66rem 0.7rem;
  border-radius: 0.55rem;
  font-size: 0.76rem;
}

.menu-item.highlight {
  color: #064a9f;
  background: #e9f3ff;
  font-weight: 700;
}

.menu-item img {
  width: 18px;
  height: 18px;
}

.section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: 3rem;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

.section-heading p {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  min-height: 250px;
  padding: 1.6rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
}

.card-number {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-bottom: 2.5rem;
  color: var(--white);
  background: var(--navy);
  border-radius: 0.7rem;
  font-weight: 800;
}

.card h3 {
  margin-bottom: 0.7rem;
  font-size: 1.25rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.privacy-band {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 3rem;
  align-items: center;
  padding: clamp(2rem, 6vw, 4rem);
  color: var(--white);
  background: var(--navy);
  border-radius: 1.7rem;
  box-shadow: var(--shadow);
}

.privacy-band h2 {
  margin-bottom: 1rem;
  font-size: clamp(2.2rem, 4vw, 3.5rem);
}

.privacy-band p {
  color: #bdd0e6;
}

.privacy-list {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.privacy-list li {
  padding: 0.85rem 1rem;
  color: #e7f4ff;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.8rem;
}

.privacy-band .button {
  margin-top: 1rem;
  color: var(--navy);
  background: var(--white);
  border-color: var(--white);
}

.compatibility {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.compatibility span {
  padding: 0.55rem 0.8rem;
  color: var(--blue-deep);
  background: #e6f2ff;
  border: 1px solid #cfe4fb;
  border-radius: 999px;
  font-weight: 750;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 3rem 0 4rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.policy-page {
  max-width: 820px;
  padding: 4rem 0 7rem;
}

.policy-page h1 {
  font-size: clamp(2.7rem, 7vw, 4.8rem);
}

.policy-page h2 {
  margin-top: 2.7rem;
  margin-bottom: 0.75rem;
  font-size: 1.55rem;
}

.policy-page p,
.policy-page li {
  color: #42536a;
}

.policy-meta {
  margin-bottom: 2.5rem;
  color: var(--muted);
}

.policy-callout {
  margin: 2rem 0;
  padding: 1rem 1.2rem;
  background: #eaf5ff;
  border-left: 4px solid var(--blue);
  border-radius: 0 0.7rem 0.7rem 0;
}

@media (max-width: 820px) {
  .hero,
  .section-heading,
  .privacy-band {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 3rem;
  }

  .browser-demo {
    transform: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .card {
    min-height: auto;
  }
}

@media (max-width: 560px) {
  .site-header {
    align-items: flex-start;
    padding-top: 1rem;
  }

  .brand span,
  .github-link {
    display: none;
  }

  h1 {
    font-size: 3rem;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
  }

  .browser-demo {
    padding: 0.5rem;
  }

  .tab:nth-of-type(3) {
    display: none;
  }

  .context-menu {
    right: 0.8rem;
    width: calc(100% - 1.6rem);
  }

  .site-footer {
    flex-direction: column;
  }
}

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