/* ============================================================
   1989 UK SUMMER HITS — Second Summer of Love Dashboard
   Design system: acid-house rave palette meets chart-countdown
   ============================================================ */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --content-wide: 1200px;

  --font-display: 'Clash Display', 'Arial Black', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

/* ---------- Color system: light (paper flyer) ---------- */
:root,
[data-theme='light'] {
  --color-bg: #f6f2e7;
  --color-surface: #fffdf7;
  --color-surface-2: #fbf7ec;
  --color-surface-offset: #efe8d6;
  --color-border: #ddd3b8;
  --color-divider: #e5dcc4;

  --color-text: #1a1611;
  --color-text-muted: #6d6555;
  --color-text-faint: #a89f8a;
  --color-text-inverse: #12100c;

  --color-primary: #7c8400;
  --color-primary-ink: #12100c;
  --color-accent-yellow: #d8e600;
  --color-accent-magenta: #d1146a;
  --color-accent-teal: #0f9e8c;
  --color-accent-coral: #e05a2b;

  --shadow-sm: 0 1px 2px rgba(30, 25, 10, 0.08);
  --shadow-md: 0 6px 20px rgba(30, 25, 10, 0.10);
  --shadow-lg: 0 16px 40px rgba(30, 25, 10, 0.14);
}

/* ---------- Color system: dark (club floor) ---------- */
[data-theme='dark'] {
  --color-bg: #0a0910;
  --color-surface: #16131d;
  --color-surface-2: #1c1824;
  --color-surface-offset: #24202c;
  --color-border: #3a3345;
  --color-divider: #2a2532;

  --color-text: #f7f4ff;
  --color-text-muted: #b0a8c2;
  --color-text-faint: #6f6680;
  --color-text-inverse: #0a0910;

  --color-primary: #b6ff2e;
  --color-primary-ink: #0b1400;
  --color-accent-yellow: #ffe600;
  --color-accent-magenta: #ff2e93;
  --color-accent-teal: #17d4ff;
  --color-accent-coral: #ff5a1f;

  --glow-primary: 0 0 18px rgba(182, 255, 46, 0.45);
  --glow-magenta: 0 0 16px rgba(255, 46, 147, 0.4);
  --glow-teal: 0 0 16px rgba(23, 212, 255, 0.4);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.6);
}

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, svg { display: block; max-width: 100%; }
ul[role='list'] { list-style: none; }
input, button { font: inherit; color: inherit; }

h1, h2, h3 { text-wrap: balance; line-height: 1.1; font-family: var(--font-display); }
p { text-wrap: pretty; }

::selection { background: var(--color-accent-yellow); color: var(--color-text-inverse); }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }

a, button, [role='button'], input {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--color-primary); color: var(--color-primary-ink);
  padding: var(--space-2) var(--space-4); font-weight: 600;
}
.skip-link:focus { left: var(--space-4); top: var(--space-4); }

/* ============ Header ============ */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--color-text); }
.brand-mark { color: var(--color-primary); flex-shrink: 0; }
.brand-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
}
.theme-toggle {
  width: 40px; height: 40px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text); border: 1px solid var(--color-border);
}
.theme-toggle:hover { background: var(--color-surface-offset); border-color: var(--color-text-faint); }

/* ============ Hero ============ */
.hero { padding-block: clamp(var(--space-10), 6vw, var(--space-20)); }
.hero-inner { max-width: var(--content-wide); margin: 0 auto; padding-inline: var(--space-6); }
.hero-kicker {
  font-family: var(--font-body); font-weight: 600; font-size: var(--text-xs);
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.hero-title {
  font-size: var(--text-2xl); font-weight: 600; max-width: 22ch;
  margin-bottom: var(--space-5);
}
.hero-copy {
  font-size: var(--text-lg); color: var(--color-text-muted); max-width: 62ch;
  margin-bottom: var(--space-10);
}

.hero-stats {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-4);
}
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex; flex-direction: column; gap: var(--space-2);
  box-shadow: var(--shadow-sm);
}
.stat-card--wide { justify-content: center; }
.stat-value {
  font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700;
  color: var(--color-text);
}
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; }

.genre-bar {
  display: flex; height: 14px; border-radius: var(--radius-full); overflow: hidden;
  margin-block: var(--space-2);
  background: var(--color-surface-offset);
}
.genre-bar span { display: block; height: 100%; }
.genre-legend { display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-5); margin-top: var(--space-1); }
.genre-legend-item { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-xs); color: var(--color-text-muted); }
.genre-legend-dot { width: 9px; height: 9px; border-radius: var(--radius-full); flex-shrink: 0; }

/* ============ Controls ============ */
.controls {
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface-2);
  position: sticky; top: 65px; z-index: 30;
}
.controls-inner {
  max-width: var(--content-wide); margin: 0 auto; padding: var(--space-5) var(--space-6);
  display: flex; flex-wrap: wrap; gap: var(--space-6); align-items: flex-end;
}
.filter-group { display: flex; flex-direction: column; gap: var(--space-2); }
.filter-group-label {
  font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.chip-row { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.chip {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: var(--text-sm); font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.chip:hover { border-color: var(--color-text-faint); color: var(--color-text); }
.chip[aria-pressed="true"] {
  background: var(--color-primary); color: var(--color-primary-ink);
  border-color: var(--color-primary); font-weight: 600;
}
[data-theme='dark'] .chip[aria-pressed="true"] { box-shadow: var(--glow-primary); }
[data-theme='dark'] .brand-mark { filter: drop-shadow(0 0 6px rgba(182, 255, 46, 0.5)); }

.search-group {
  position: relative; margin-left: auto; align-self: center;
  min-width: 220px; flex: 1 1 220px; max-width: 320px;
}
.search-icon { position: absolute; left: var(--space-3); top: 50%; transform: translateY(-50%); color: var(--color-text-faint); pointer-events: none; }
.search-group input {
  width: 100%; padding: var(--space-3) var(--space-3) var(--space-3) var(--space-10);
  border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: var(--color-surface); font-size: var(--text-sm);
}
.search-group input:focus { border-color: var(--color-primary); }
.search-group input::placeholder { color: var(--color-text-faint); }

/* ============ Table Section ============ */
.table-section { padding-block: clamp(var(--space-8), 5vw, var(--space-16)); }
.table-section-inner { max-width: var(--content-wide); margin: 0 auto; padding-inline: var(--space-6); }
.table-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-4); }
.result-count { font-size: var(--text-sm); color: var(--color-text-muted); }
.reset-btn {
  font-size: var(--text-sm); font-weight: 600; color: var(--color-primary);
  padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm);
}
.reset-btn:hover { text-decoration: underline; }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}

#hitsTable { min-width: 780px; }
#hitsTable thead th {
  text-align: left;
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
#hitsTable thead th:first-child { border-top-left-radius: var(--radius-lg); }
#hitsTable thead th:hover { color: var(--color-text); }
#hitsTable thead th span { display: inline-flex; align-items: center; gap: var(--space-1); }
.sort-icon {
  display: inline-block; width: 8px; height: 8px; margin-left: var(--space-1);
  border-right: 1.5px solid var(--color-text-faint);
  border-bottom: 1.5px solid var(--color-text-faint);
  transform: rotate(45deg); transition: transform var(--transition-interactive);
}
th[aria-sort="ascending"] .sort-icon { transform: rotate(-135deg); border-color: var(--color-primary); }
th[aria-sort="descending"] .sort-icon { transform: rotate(45deg); border-color: var(--color-primary); }
th.col-numeric { text-align: left; }
.col-listen { text-align: center; }

#hitsTable tbody td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  vertical-align: middle;
}
#hitsTable tbody tr:last-child td { border-bottom: none; }
#hitsTable tbody tr:hover { background: var(--color-surface-offset); }

.cell-artist { font-weight: 600; }
.cell-track { color: var(--color-text-muted); }
.cell-peak {
  font-family: var(--font-display); font-weight: 600; font-variant-numeric: tabular-nums;
}
.cell-peak--no1 { color: var(--color-primary); }
[data-theme='dark'] .cell-peak--no1 { text-shadow: 0 0 12px rgba(182, 255, 46, 0.55); }
.cell-weeks { font-variant-numeric: tabular-nums; color: var(--color-text-muted); }
.cell-weeks--has { color: var(--color-text); font-weight: 600; }

.genre-badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600;
  background: var(--color-surface-offset);
  white-space: nowrap;
}
.genre-badge-dot { width: 8px; height: 8px; border-radius: var(--radius-full); flex-shrink: 0; }

.listen-link {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: var(--radius-full);
  border: 1px solid var(--color-border); color: var(--color-text-muted);
}
.listen-link:hover { background: var(--color-primary); color: var(--color-primary-ink); border-color: var(--color-primary); }
[data-theme='dark'] .listen-link:hover { box-shadow: var(--glow-primary); }

.empty-state {
  text-align: center; padding: var(--space-16) var(--space-6);
  color: var(--color-text-muted); font-size: var(--text-base);
}

/* ============ Context ============ */
.context { border-top: 1px solid var(--color-divider); padding-block: clamp(var(--space-10), 6vw, var(--space-16)); }
.context-inner { max-width: 720px; margin: 0 auto; padding-inline: var(--space-6); }
.context h2 { font-size: var(--text-lg); margin-bottom: var(--space-4); }
.context p { color: var(--color-text-muted); font-size: var(--text-base); }

/* ============ Footer ============ */
.site-footer { border-top: 1px solid var(--color-divider); padding-block: var(--space-8); }
.footer-inner { max-width: var(--content-wide); margin: 0 auto; padding-inline: var(--space-6); }
.footer-inner p { font-size: var(--text-xs); color: var(--color-text-faint); max-width: 90ch; }
.footer-inner a { color: var(--color-text-muted); text-decoration: underline; text-decoration-color: var(--color-border); }
.footer-inner a:hover { color: var(--color-primary); }

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .stat-card--wide { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .controls { position: static; }
  .header-inner { padding-inline: var(--space-4); }
  .hero-inner, .table-section-inner, .controls-inner, .context-inner, .footer-inner { padding-inline: var(--space-4); }
  .hero-stats { grid-template-columns: 1fr; }
  .search-group { margin-left: 0; max-width: none; flex: 0 0 auto; align-self: stretch; }
  .controls-inner { flex-direction: column; align-items: stretch; }
}