:root {
  color-scheme: dark;
  --lab-bg: #080b12;
  --lab-panel: #101622;
  --lab-panel-2: #162033;
  --lab-border: rgba(148, 163, 184, 0.22);
  --lab-text: #f8fafc;
  --lab-muted: #9aa8bc;
  --lab-accent: #38bdf8;
  --lab-accent-2: #a3e635;
  --lab-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.lab-home {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 0%, rgba(56, 189, 248, 0.18), transparent 32%),
    radial-gradient(circle at 92% 12%, rgba(163, 230, 53, 0.12), transparent 26%),
    linear-gradient(180deg, #0a1020 0%, var(--lab-bg) 52%, #07090f 100%);
  color: var(--lab-text);
}

.home-hero {
  min-height: 56vh;
  padding: 24px clamp(18px, 4vw, 56px) 48px;
  display: grid;
  align-content: start;
  gap: clamp(56px, 10vw, 112px);
}

.home-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}

.home-nav a,
.brand {
  color: var(--lab-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}

.home-nav a:hover {
  color: var(--lab-text);
}

.home-nav .brand {
  margin-right: auto;
  color: var(--lab-text);
  font-size: 17px;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--lab-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
}

.lang-btn {
  min-height: 30px;
  padding: 0 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--lab-muted);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.lang-btn:hover,
.lang-btn.active {
  background: rgba(56, 189, 248, 0.16);
  color: var(--lab-text);
}

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

body[data-lang="zh"] .lang-zh,
body[data-lang="en"] .lang-en {
  display: inline;
}

.hero-copy {
  max-width: 980px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--lab-accent-2);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-copy h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(38px, 7vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-summary {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--lab-muted);
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 30px;
  color: var(--lab-muted);
  font-size: 14px;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  background: var(--lab-text);
  color: #07111f;
  text-decoration: none;
  font-weight: 800;
}

.tools-wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 34px clamp(18px, 4vw, 40px) 64px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 38px);
}

.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.filter-btn {
  border: 1px solid var(--lab-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--lab-muted);
  min-height: 36px;
  padding: 0 12px;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: rgba(56, 189, 248, 0.55);
  background: rgba(56, 189, 248, 0.12);
  color: var(--lab-text);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.tool-card {
  min-height: 250px;
  border: 1px solid var(--lab-border);
  border-radius: 8px;
  background: rgba(16, 22, 34, 0.76);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03) inset;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: rgba(56, 189, 248, 0.56);
  background: rgba(22, 32, 51, 0.86);
}

.tool-card a {
  display: flex;
  min-height: 250px;
  flex-direction: column;
  padding: 18px;
  color: inherit;
  text-decoration: none;
}

.tool-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.tool-icon {
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid rgba(56, 189, 248, 0.34);
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.1);
  color: #bae6fd;
  font-size: 12px;
  font-weight: 900;
}

.tool-category {
  color: var(--lab-muted);
  font-size: 12px;
  font-weight: 800;
}

.tool-card h2 {
  margin: 0;
  font-size: 21px;
  letter-spacing: 0;
}

.tool-card p {
  margin: 10px 0 0;
  color: var(--lab-muted);
  line-height: 1.55;
  font-size: 14px;
}

.open-link {
  margin-top: auto;
  padding-top: 18px;
  color: var(--lab-accent);
  font-size: 13px;
  font-weight: 900;
}

.home-footer {
  border-top: 1px solid var(--lab-border);
  padding: 22px;
  color: var(--lab-muted);
  text-align: center;
}

.lab-simple-footer {
  margin: 32px auto 24px;
  padding: 18px 20px;
  color: #94a3b8;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
}

.lab-simple-footer a {
  color: #7dd3fc;
  font-weight: 800;
  text-decoration: none;
}

.lab-simple-footer a:hover {
  color: #bae6fd;
  text-decoration: underline;
}

@media (max-width: 760px) {
  .section-head {
    display: block;
  }

  .filters {
    justify-content: flex-start;
    margin-top: 18px;
  }

  .home-hero {
    min-height: auto;
    gap: 54px;
  }

  .nav-links {
    order: 3;
    width: 100%;
  }

}