/* ═══════════════════════════════════════════
   FragranceAI — Layout & Grid System
   ═══════════════════════════════════════════ */

/* ── Container ── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-8);
}

.container--narrow {
  max-width: 700px;
}

.container--chat {
  max-width: 900px;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

/* ── Grid System ── */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Auto-fill grids with min size */
.grid-auto-2 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-auto-3 { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }

/* ── Sections ── */
.section {
  padding: var(--space-16) var(--space-8);
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-alt {
  background: var(--gray-50);
}

/* ── Page Header ── */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-header h1 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--accent);
  letter-spacing: var(--tracking-tight);
}

.page-header .actions {
  display: flex;
  gap: var(--space-2);
}

/* ── Main Content ── */
.main {
  min-height: calc(100vh - 56px - 64px);
}

/* ── Hero (Full Width) ── */
.hero {
  padding: 100px 32px 80px;
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 700px 500px at 15% 30%, rgba(8, 145, 178, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 600px 400px at 80% 20%, rgba(6, 182, 212, 0.03) 0%, transparent 55%);
}

.hero-content {
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: var(--text-5xl);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: var(--space-5);
}

.hero .lead {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-10);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-16);
  margin-bottom: var(--space-10);
}

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

.hero-stat-value {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  display: block;
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
}

/* ── Section Title ── */
.sec-title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--accent);
  letter-spacing: var(--tracking-tight);
  text-align: center;
  margin-bottom: var(--space-12);
}

/* ── Library ── */
.library-section {
  padding: var(--space-10) var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-card);
  padding: var(--space-5) 0;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--gray-400);
}

.footer-left strong {
  color: var(--gray-600);
}

.footer-right {
  font-size: var(--text-xs);
  color: var(--gray-400);
}

/* ── CTA Block ── */
.cta-block {
  text-align: center;
}

.cta-block h2 {
  font-size: var(--text-3xl);
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.cta-block p {
  color: var(--text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-6);
}

/* ── Feature Grid ── */
.feat-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

/* ── Steps ── */
.steps {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ── Page Title (generic h1 inside .main) ── */
.main h1 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--accent);
  margin-bottom: var(--space-6);
  letter-spacing: var(--tracking-tight);
}

/* ── Tables ── */
.table-scroll {
  overflow-x: auto;
}

.chromatogram-chart {
  width: 100%;
  height: 400px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.data-table th {
  background: var(--gray-50);
  padding: 12px 16px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: var(--weight-semibold);
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 12px 16px;
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
  background: rgba(8, 145, 178, 0.04);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ── Pagination ── */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* ── Utility Classes ── */
.text-center { text-align: center; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.muted {
  color: var(--gray-400);
  font-size: var(--text-xs);
}

.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--gray-400);
}

/* ── Search ── */
.search-bar {
  display: flex;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: var(--space-4);
  transition: border-color var(--transition);
}

.search-bar:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  padding: 14px 20px;
  font-size: 0.95rem;
  font-family: var(--font-primary);
  min-width: 0;
}

.search-bar input::placeholder {
  color: var(--gray-400);
}

.search-bar button {
  padding: 14px 28px;
  border: none;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: var(--weight-medium);
  cursor: pointer;
}

.search-bar button:hover {
  background: var(--accent-deep);
}

.search-meta {
  font-size: var(--text-sm);
  color: var(--gray-400);
  margin-bottom: var(--space-4);
}

/* ── Sample Header ── */
.sample-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.sample-info {
  color: var(--gray-600);
  font-size: 0.9rem;
}

.sample-header .actions {
  display: flex;
  gap: var(--space-2);
}

/* ── Analysis Card ── */
.analysis-card {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin: 14px 0;
  border-left: 4px solid var(--accent);
}

.analysis-meta {
  display: flex;
  gap: var(--space-5);
  font-size: var(--text-sm);
  color: var(--gray-400);
  margin-bottom: var(--space-3);
}

/* ── Responsive Breakpoints ── */
@media (max-width: 1024px) {
  .feat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 64px 20px 48px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-stats {
    gap: var(--space-6);
    flex-wrap: wrap;
  }

  .hero-stat-value {
    font-size: var(--text-2xl);
  }

  .feat-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .section,
  .library-section {
    padding: var(--space-10) var(--space-4);
  }

  .container {
    padding: 0 var(--space-4);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .topnav-inner {
    padding: 0 var(--space-4);
  }
}

@media (max-width: 640px) {
  .page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .page-header .actions {
    justify-content: flex-start;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-4);
  }

  .cta {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}