/* ============================================================
   LUONVUITUOI-CERT — Custom Material Theme Overrides
   Brand: deep teal + warm amber accent
   ============================================================ */

:root {
  --lvt-teal-900: #0a5757;
  --lvt-teal-700: #0d6e6e;
  --lvt-teal-500: #14b8a6;
  --lvt-teal-100: #ccfbf1;
  --lvt-amber-500: #fbbf24;
  --lvt-amber-600: #d97706;
  --lvt-ink-900: #0f172a;
  --lvt-ink-600: #475569;
  --lvt-ink-300: #cbd5e1;
  --lvt-surface: #ffffff;
  --lvt-surface-alt: #f8fafc;
}

/* Light palette */
[data-md-color-scheme="default"] {
  --md-primary-fg-color:        var(--lvt-teal-700);
  --md-primary-fg-color--light: var(--lvt-teal-500);
  --md-primary-fg-color--dark:  var(--lvt-teal-900);
  --md-accent-fg-color:         var(--lvt-amber-600);
  --md-typeset-a-color:         var(--lvt-teal-700);
}

/* Dark palette */
[data-md-color-scheme="slate"] {
  --md-primary-fg-color:        var(--lvt-teal-500);
  --md-primary-fg-color--light: var(--lvt-teal-100);
  --md-primary-fg-color--dark:  var(--lvt-teal-900);
  --md-accent-fg-color:         var(--lvt-amber-500);
  --md-typeset-a-color:         var(--lvt-teal-500);
  --md-default-bg-color:        #0b1220;
  --md-code-bg-color:           #101a2c;
}

/* Smooth typography */
body, .md-typeset {
  font-feature-settings: "ss01", "cv11";
  letter-spacing: -0.01em;
}

.md-typeset h1 {
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--lvt-teal-700) 0%, var(--lvt-teal-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-md-color-scheme="slate"] .md-typeset h1 {
  background: linear-gradient(135deg, var(--lvt-teal-100) 0%, var(--lvt-teal-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.md-typeset h2 {
  font-weight: 700;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  padding-bottom: 0.35em;
  margin-top: 2.4em;
}

/* ============================================================
   Header polish
   ============================================================ */
.md-header {
  background: linear-gradient(100deg, var(--lvt-teal-900) 0%, var(--lvt-teal-700) 60%, var(--lvt-teal-500) 100%);
  box-shadow: 0 2px 12px rgba(13, 110, 110, 0.25);
}

.md-tabs {
  background: rgba(10, 87, 87, 0.92);
  backdrop-filter: blur(8px);
}

/* ============================================================
   Hero section (used in index.md)
   ============================================================ */
.lvt-hero {
  position: relative;
  padding: 4rem 1.5rem 3rem;
  margin: 1rem -0.8rem 2rem;
  border-radius: 0 0 24px 24px;
  overflow: hidden;
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(20, 184, 166, 0.22), transparent 60%),
    radial-gradient(900px 500px at 90% 0%, rgba(251, 191, 36, 0.18), transparent 55%),
    linear-gradient(135deg, #083d3d 0%, #0d6e6e 55%, #14b8a6 100%);
  color: #ffffff;
  text-align: center;
}

.lvt-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
  pointer-events: none;
}

.lvt-hero > * { position: relative; z-index: 1; }

.lvt-hero-logo {
  width: 88px;
  height: 88px;
  margin: 0 auto 1.25rem;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.25));
  animation: lvt-float 4s ease-in-out infinite;
}

@keyframes lvt-float {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-6px); }
}

.lvt-hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: #ffffff !important;
  background: none !important;
  -webkit-text-fill-color: #ffffff !important;
  margin: 0 0 0.75rem;
  line-height: 1.1;
}

.lvt-hero-tagline {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.88);
  max-width: 640px;
  margin: 0 auto 2rem;
  line-height: 1.55;
}

.lvt-cta-row {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.lvt-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.lvt-btn-primary {
  background: var(--lvt-amber-500);
  color: var(--lvt-ink-900) !important;
  box-shadow: 0 6px 20px rgba(251, 191, 36, 0.35);
}

.lvt-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(251, 191, 36, 0.5);
}

.lvt-btn-ghost {
  background: rgba(255,255,255,0.08);
  color: #ffffff !important;
  border: 1px solid rgba(255,255,255,0.22);
  backdrop-filter: blur(6px);
}

.lvt-btn-ghost:hover {
  background: rgba(255,255,255,0.16);
  transform: translateY(-2px);
}

.lvt-badges {
  display: flex;
  justify-content: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.lvt-badges img { height: 22px; }

/* ============================================================
   Feature grid cards
   ============================================================ */
.lvt-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 2rem 0 3rem;
}

.lvt-feature {
  padding: 1.5rem 1.25rem;
  border-radius: 14px;
  background: var(--lvt-surface-alt);
  border: 1px solid var(--md-default-fg-color--lightest);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

[data-md-color-scheme="slate"] .lvt-feature {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.08);
}

.lvt-feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(13, 110, 110, 0.12);
  border-color: var(--lvt-teal-500);
}

.lvt-feature-icon {
  font-size: 1.8rem;
  margin-bottom: 0.6rem;
  display: block;
}

.lvt-feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.lvt-feature p {
  margin: 0;
  color: var(--md-default-fg-color--light);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* ============================================================
   Stats strip
   ============================================================ */
.lvt-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 2.5rem 0;
  padding: 1.5rem;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--lvt-teal-900) 0%, var(--lvt-teal-700) 100%);
  color: #ffffff;
}

.lvt-stat {
  text-align: center;
}

.lvt-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--lvt-amber-500);
  letter-spacing: -0.02em;
  line-height: 1;
}

.lvt-stat-label {
  font-size: 0.85rem;
  margin-top: 0.25rem;
  color: rgba(255,255,255,0.75);
}

/* ============================================================
   Code blocks polish
   ============================================================ */
.highlight pre {
  border-radius: 10px;
  border: 1px solid var(--md-default-fg-color--lightest);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.md-typeset code {
  border-radius: 4px;
  padding: 0.12em 0.35em;
}

/* ============================================================
   Footer polish
   ============================================================ */
.md-footer-meta {
  background: linear-gradient(100deg, var(--lvt-teal-900), var(--lvt-teal-700));
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb {
  background: var(--lvt-teal-500);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: var(--lvt-teal-700); }

/* ============================================================
   Theme picker (auto/light/dark direct-select) — replaces the
   cycling Material toggle so users pick once instead of clicking
   through schemes.
   ============================================================ */
.lvt-theme-picker {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0 0.25rem;
}

.lvt-theme-picker > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.4rem 0.55rem;
  border-radius: 8px;
  font-size: 1.1rem;
  line-height: 1;
  color: #ffffff;
  background: transparent;
  transition: background 0.15s ease;
}

.lvt-theme-picker > summary::-webkit-details-marker { display: none; }
.lvt-theme-picker > summary:hover,
.lvt-theme-picker[open] > summary {
  background: rgba(255, 255, 255, 0.12);
}

.lvt-theme-picker-menu {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  min-width: 240px;
  padding: 0.35rem;
  /* Solid opaque background — Material header sits at z-index up to 4;
     popover needs to be unambiguously above the nav tabs + hero content. */
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 10px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.18);
  z-index: 1000;
  backdrop-filter: none;
}

[data-md-color-scheme="slate"] .lvt-theme-picker-menu,
[data-md-color-scheme="default"] .lvt-theme-picker-menu {
  /* Explicit color per scheme so neither auto nor manual mode inherits
     a translucent hero gradient. */
}

[data-md-color-scheme="slate"] .lvt-theme-picker-menu {
  background: #1a2a44;
  border-color: rgba(255,255,255,0.1);
  color: #e6ebf5;
}

.lvt-theme-picker-menu button {
  display: grid;
  grid-template-columns: 24px 1fr auto;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.55rem 0.7rem;
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  color: var(--md-default-fg-color);
  font: inherit;
  text-align: left;
  transition: background 0.12s ease;
}

.lvt-theme-picker-menu button:hover {
  background: var(--md-default-fg-color--lightest);
}

[data-md-color-scheme="slate"] .lvt-theme-picker-menu button:hover {
  background: rgba(255,255,255,0.06);
}

.lvt-theme-picker-menu button.is-active {
  background: var(--lvt-teal-100);
  color: var(--lvt-teal-900);
  font-weight: 600;
}

[data-md-color-scheme="slate"] .lvt-theme-picker-menu button.is-active {
  background: rgba(20, 184, 166, 0.2);
  color: var(--lvt-teal-100);
}

.lvt-theme-picker-icon { font-size: 1.15rem; line-height: 1; }
.lvt-theme-picker-label { font-size: 0.92rem; }
.lvt-theme-picker-hint {
  font-size: 0.75rem;
  color: var(--md-default-fg-color--light);
}
.lvt-theme-picker-menu button.is-active .lvt-theme-picker-hint {
  color: inherit;
  opacity: 0.7;
}

/* Hide the default Material palette toggle — we control the picker now. */
.md-header [data-md-component="palette"] { display: none !important; }

/* Credits strip — compact attribution shown above the hero. */
.lvt-credits {
  position: relative;
  z-index: 2;
  max-width: 980px;
  margin: 0.75rem auto 1rem;
  padding: 0.6rem 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--md-default-fg-color);
  background: linear-gradient(90deg, rgba(204,251,241,0.35), rgba(251,191,36,0.2), rgba(204,251,241,0.35));
  border-radius: 999px;
}

[data-md-color-scheme="slate"] .lvt-credits {
  color: var(--lvt-teal-100);
  background: linear-gradient(90deg, rgba(20,184,166,0.15), rgba(251,191,36,0.15), rgba(20,184,166,0.15));
}
.lvt-credits a {
  color: var(--lvt-teal-700);
  text-decoration: none;
  border-bottom: 1px dashed rgba(13, 110, 110, 0.35);
}
.lvt-credits a:hover { border-bottom-style: solid; }

[data-md-color-scheme="slate"] .lvt-credits a {
  color: var(--lvt-teal-100);
  border-bottom-color: rgba(204, 251, 241, 0.35);
}

/* Responsive tweaks */
@media (max-width: 600px) {
  .lvt-hero { padding: 2.5rem 1rem 2rem; }
  .lvt-hero-logo { width: 64px; height: 64px; }
  .lvt-features { grid-template-columns: 1fr; }
}