/* ── LANDING PAGE STYLES ── */
/* Styles specific to index.html only — no overrides to shared tokens */

/* ── SHELL ── */
.landing-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
}

/* ── HEADER ── */
.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-8);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-main);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
}

.landing-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.landing-title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  font-family: var(--font-display);
}

.landing-title span {
  color: var(--accent-orange);
}

.landing-badge {
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  padding: 2px var(--space-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-display);
}

.landing-header-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-family: var(--font-display);
  transition: color var(--transition-ui);
}

.landing-header-link:hover {
  color: var(--text-primary);
}

/* ── HERO SECTION ── */
.landing-hero {
  text-align: center;
  padding: var(--space-12) var(--space-8) var(--space-8);
  max-width: 700px;
  margin: 0 auto;
}

.landing-hero-eyebrow {
  font-size: var(--text-xs);
  color: var(--accent-orange);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-family: var(--font-display);
  margin-bottom: var(--space-4);
}

.landing-hero-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text-primary);
  font-family: var(--font-display);
  margin-bottom: var(--space-4);
}

.landing-hero-title span {
  color: var(--accent-orange);
}

.landing-hero-subtitle {
  font-size: var(--text-base);
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 520px;
  margin: 0 auto;
}

/* ── SECTION LABEL ── */
.landing-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-8) var(--space-12);
  width: 100%;
}

.landing-section-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.landing-section-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-family: var(--font-display);
}

.landing-section-line {
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

/* ── ALGORITHM CARDS GRID ── */
.algo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

@media (max-width: 900px) {
  .algo-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .algo-grid {
    grid-template-columns: 1fr;
  }
  .landing-hero {
    padding: var(--space-8) var(--space-4) var(--space-6);
  }
  .landing-section {
    padding: 0 var(--space-4) var(--space-8);
  }
  .landing-header {
    padding: 0 var(--space-4);
  }
}

/* ── SINGLE ALGORITHM CARD ── */
.algo-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: border-color var(--transition-ui), transform var(--transition-ui), box-shadow var(--transition-ui);
  position: relative;
  overflow: hidden;
}

.algo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-orange);
  opacity: 0;
  transition: opacity var(--transition-ui);
}

.algo-card:hover {
  border-color: var(--accent-orange);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--accent-orange);
}

.algo-card:hover::before {
  opacity: 1;
}

/* ── CARD HEADER ── */
.algo-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.algo-card-name {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  font-family: var(--font-display);
  line-height: 1.2;
}

.algo-card-name span {
  color: var(--accent-orange);
}

.algo-card-badge {
  font-size: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  white-space: nowrap;
}

.badge-comparison {
  background: rgba(52, 152, 219, 0.15);
  color: var(--bar-active);
  border: 1px solid rgba(52, 152, 219, 0.3);
}

.badge-divide {
  background: rgba(231, 76, 60, 0.12);
  color: var(--bar-pivot);
  border: 1px solid rgba(231, 76, 60, 0.25);
}

/* ── CARD DESCRIPTION ── */
.algo-card-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

/* ── COMPLEXITY TABLE ── */
.algo-complexity {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

.algo-complexity-cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.complexity-label {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-display);
}

.complexity-value {
  font-size: var(--text-xs);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 600;
}

.complexity-value.good   { color: var(--bar-sorted); }
.complexity-value.ok     { color: var(--bar-comparing); }
.complexity-value.bad    { color: var(--bar-pivot); }
.complexity-value.space  { color: var(--accent-orange); }

/* ── CARD FOOTER ── */
.algo-card-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-4);
}

.btn-visualize {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background var(--transition-ui), color var(--transition-ui), border-color var(--transition-ui);
  text-decoration: none;
}

.btn-visualize:hover {
  background: var(--accent-orange);
  border-color: var(--accent-orange);
  color: #fff;
}

/* ── FOOTER ── */
.landing-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-5) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-family: var(--font-display);
}

.landing-footer a {
  color: var(--accent-orange);
  transition: opacity var(--transition-ui);
}

.landing-footer a:hover {
  opacity: 0.8;
}

/* ── ANIMATIONS ── */
@keyframes landingFadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.landing-hero { animation: landingFadeUp 500ms ease both; }
.landing-section { animation: landingFadeUp 500ms 100ms ease both; }

.algo-card {
  animation: landingFadeUp 400ms ease both;
}

.algo-card:nth-child(1) { animation-delay: 80ms;  }
.algo-card:nth-child(2) { animation-delay: 120ms; }
.algo-card:nth-child(3) { animation-delay: 160ms; }
.algo-card:nth-child(4) { animation-delay: 200ms; }
.algo-card:nth-child(5) { animation-delay: 240ms; }
.algo-card:nth-child(6) { animation-delay: 280ms; }
.algo-card:nth-child(7) { animation-delay: 320ms; }