:root {
  color-scheme: dark;
  --bg: #0b1119;
  --bg-soft: #131d2b;
  --panel: rgba(14, 22, 33, 0.84);
  --line: rgba(255, 255, 255, 0.16);
  --text: #f4f7fd;
  --text-soft: #b8c3d6;
  --gold: #e0b96b;
  --gold-soft: #f1d49d;
  --sky: #38bdf8;
  --pill: rgba(255, 255, 255, 0.09);
  --danger: #f87171;
  --force-ring: #c9a156;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f0f2f5;
  --bg-soft: #e2e7ee;
  --panel: rgba(242, 246, 250, 0.94);
  --line: rgba(36, 54, 84, 0.16);
  --text: #1d1d1f;
  --text-soft: #415069;
  --gold: #ff6a00;
  --gold-soft: #d95500;
  --sky: #1d5f9d;
  --pill: rgba(15, 23, 42, 0.06);
  --danger: #b42318;
  --force-ring: #ff7a1a;
}

:root[data-theme="light"] body {
  background:
    radial-gradient(1200px 620px at 100% -12%, rgba(255, 122, 26, 0.028), transparent 72%),
    radial-gradient(920px 520px at -10% 8%, rgba(82, 129, 184, 0.032), transparent 66%),
    linear-gradient(180deg, #f4f6f8 0%, #edf1f5 46%, #e4e9ef 100%);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.theme-switch-btn {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid rgba(224, 185, 107, 0.34);
  background: rgba(224, 185, 107, 0.08);
  color: var(--gold-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  outline: none;
  padding: 0;
  flex: 0 0 auto;
}

.theme-switch-btn:hover {
  background: rgba(224, 185, 107, 0.16);
  border-color: rgba(224, 185, 107, 0.58);
  color: var(--text);
  transform: translateY(-1px);
}

.theme-switch-btn svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

:root[data-theme="light"] .theme-switch-btn {
  border-color: rgba(255, 106, 0, 0.36);
  background: rgba(255, 106, 0, 0.1);
  color: #da5900;
}

:root[data-theme="light"] .theme-switch-btn:hover {
  background: rgba(255, 106, 0, 0.17);
  border-color: rgba(255, 106, 0, 0.56);
  color: #b74400;
}

:root[data-theme="light"] .brand-logo {
  filter: none;
  opacity: 1;
}

:root[data-theme="light"] .hero {
  background: linear-gradient(154deg, rgba(247, 250, 253, 0.96), rgba(239, 244, 250, 0.94));
  box-shadow:
    0 30px 72px rgba(20, 32, 52, 0.2),
    0 10px 28px rgba(20, 32, 52, 0.12),
    0 1px 0 rgba(255, 255, 255, 0.75) inset;
}

:root[data-theme="light"] .hero-top {
  border-bottom: 1px solid rgba(15, 23, 42, 0.12);
}

:root[data-theme="light"] .site-link {
  color: #415372;
  border-color: rgba(36, 54, 84, 0.14);
  background: rgba(255, 255, 255, 0.8);
}

:root[data-theme="light"] .site-link.active {
  color: #ffffff;
  border-color: rgba(255, 106, 0, 0.45);
  background: linear-gradient(120deg, #ff8d3a, #ff6a00);
  box-shadow: 0 4px 14px rgba(255, 106, 0, 0.28);
}

:root[data-theme="light"] .tab {
  color: #2f4564;
  background: rgba(212, 226, 242, 0.8);
  border-color: rgba(58, 83, 120, 0.14);
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.45);
  font-weight: 700;
}

:root[data-theme="light"] .tab:hover {
  color: #213752;
  background: rgba(198, 216, 236, 0.95);
  border-color: rgba(58, 83, 120, 0.22);
}

:root[data-theme="light"] .tab.active {
  color: #ffffff;
  background: linear-gradient(120deg, #ff8d3a, #ff6a00);
  border-color: rgba(255, 106, 0, 0.62);
  box-shadow: 0 4px 12px rgba(255, 106, 0, 0.28);
}

:root[data-theme="light"] .force-meter {
  filter: drop-shadow(0 0 3px rgba(255, 122, 26, 0.22));
}

@media (max-width: 560px) {
  .shell {
    width: 100%;
    margin: 0;
  }

  .hero {
    padding: 16px 12px;
    border-radius: 0;
  }

  .theme-switch-btn {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 980px) {
  /* Keep top navigation geometry stable across pages on mobile/tablet. */
  .shell {
    width: 100%;
    margin: 0;
  }

  .hero {
    border-radius: 0;
    border: none;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: #0f1218;
  }

  .hero::before,
  .hero::after {
    content: none;
  }

  .hero-top {
    flex-wrap: nowrap;
    align-items: center;
    gap: 10px;
    padding-bottom: 14px;
  }

  .hero-actions {
    margin-left: auto;
    gap: 8px;
  }

  .hero-note {
    display: none;
  }

  .site-nav {
    margin-top: 14px;
  }
}