/* Art direction: Billboard-inspired chart UI -> dark editorial scan-first layout
   Palette: charcoal + mint accent, accent reserved for highlights and motion
   Typography: Anton + Inter — compressed chart identity + readable utility text
   Density: balanced-dense */

:root, [data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.72rem + 0.16vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 1rem);
  --text-base: clamp(1rem, 0.97rem + 0.18vw, 1.1rem);
  --text-lg: clamp(1.125rem, 1rem + 0.55vw, 1.4rem);
  --text-xl: clamp(1.45rem, 1.2rem + 1vw, 2rem);
  --text-2xl: clamp(1.8rem, 1.35rem + 1.5vw, 3rem);

  --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;

  --radius-sm: 0.35rem;
  --radius-md: 0.65rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --font-display: 'Anton', 'Arial Narrow', sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;

  --color-bg: #0d0f10;
  --color-surface: #15181a;
  --color-surface-2: #1b1f22;
  --color-surface-offset: #23282c;
  --color-border: rgba(255,255,255,0.08);
  --color-divider: rgba(255,255,255,0.1);
  --color-text: #f4f3ef;
  --color-text-muted: #b8beb9;
  --color-text-faint: #7b8380;
  --color-text-inverse: #0d0f10;

  --color-primary: #22e0b6;
  --color-primary-hover: #1ac79f;
  --color-primary-active: #14a987;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.22);
  --shadow-md: 0 12px 32px rgba(0,0,0,0.26);

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg: #0d0f10;
  --color-surface: #15181a;
  --color-surface-2: #1b1f22;
  --color-surface-offset: #23282c;
  --color-border: rgba(255,255,255,0.08);
  --color-divider: rgba(255,255,255,0.1);
  --color-text: #f4f3ef;
  --color-text-muted: #b8beb9;
  --color-text-faint: #7b8380;
  --color-text-inverse: #0d0f10;
  --color-primary: #22e0b6;
  --color-primary-hover: #1ac79f;
  --color-primary-active: #14a987;
}

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

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

body {
  min-height: 100dvh;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,0.035), transparent 30%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.55;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
select,
input {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

a,
button,
select {
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 999;
}

.hidden {
  display: none !important;
}

.page-shell {
  width: min(1380px, calc(100% - 1rem));
  margin: 0 auto;
  padding: var(--space-4) 0 var(--space-16);
}

.site-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-5);
  align-items: end;
  padding: var(--space-3) 0 var(--space-6);
}

.brand-block {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  min-width: 0;
}

.brand-mark {
  color: var(--color-text);
  width: 120px;
  flex: 0 0 auto;
  padding-top: 0.15rem;
}

.brand-copy {
  min-width: 0;
}

.eyebrow,
.section-kicker,
.hero-kicker,
.week-picker-label {
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: var(--text-xs);
  font-weight: 700;
}

.site-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.35rem + 2vw, 4rem);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  line-height: 0.95;
}

.tagline {
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  max-width: 58ch;
}

.header-actions {
  display: flex;
  gap: var(--space-3);
  align-items: end;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.picker-group {
  display: grid;
  gap: var(--space-2);
}

.week-picker {
  min-width: 220px;
  min-height: 44px;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  appearance: none;
}

.theme-toggle,
.ghost-button {
  min-height: 44px;
  min-width: 44px;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.theme-toggle:hover,
.ghost-button:hover,
.week-picker:hover {
  border-color: rgba(255,255,255,0.2);
  background: var(--color-surface-2);
}

.main-layout {
  display: grid;
  gap: var(--space-6);
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: var(--space-5);
  padding: clamp(var(--space-4), 2vw, var(--space-6));
  border: 1px solid var(--color-border);
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01)),
    var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.hero-copy {
  display: grid;
  gap: var(--space-2);
  align-content: center;
}

.hero-week {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 1.2rem + 1.5vw, 3rem);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1;
}

.hero-summary {
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-top: var(--space-1);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.hero-stat-card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  border-radius: var(--radius-lg);
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.hero-stat-label {
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: var(--text-xs);
  font-weight: 700;
}

.hero-stat-card strong {
  font-size: var(--text-xl);
  font-weight: 800;
}

.chart-section {
  display: grid;
  gap: var(--space-4);
}

.section-heading-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
}

.section-heading-row h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 1.25rem + 1.2vw, 2.8rem);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

#view-root {
  display: grid;
  gap: var(--space-3);
}

.chart-row {
  position: relative;
  display: grid;
  grid-template-columns: 78px 96px minmax(0, 1fr) 110px 156px 44px;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.chart-row:hover {
  background: var(--color-surface-2);
  border-color: rgba(255,255,255,0.16);
  transform: translateY(-1px);
}

.chart-row.top-spot::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 10px;
  background: var(--color-primary);
}

.rank-block {
  display: grid;
  place-items: center;
  min-height: 96px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.03);
  font-family: var(--font-display);
}

.top-spot .rank-block {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.rank-number {
  font-size: clamp(1.9rem, 1.2rem + 1vw, 3rem);
  line-height: 1;
}

.cover-wrap {
  width: 96px;
  height: 96px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  flex: 0 0 auto;
}

.cover-image {
  width: 96px;
  height: 96px;
  object-fit: cover;
}

.song-main {
  min-width: 0;
  display: grid;
  gap: 0.35rem;
  align-content: center;
}

.song-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-width: 0;
}

.movement-badge {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.song-title-link,
.artist-link {
  width: fit-content;
  max-width: 100%;
  text-align: left;
}

.song-title-link {
  color: var(--color-text);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.15;
}

.song-title-link:hover,
.artist-link:hover {
  color: var(--color-primary);
}

.artist-link {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.song-points {
  font-weight: 800;
  color: var(--color-text);
  white-space: nowrap;
}

.desktop-points {
  text-align: right;
}

.mobile-points {
  display: none;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.meta-grid {
  display: grid;
  gap: 0.4rem;
}

.meta-grid div {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 0.5rem;
  align-items: baseline;
}

.meta-grid dt {
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: var(--text-xs);
  font-weight: 700;
}

.meta-grid dd {
  font-weight: 700;
}

.expand-button {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  font-size: 1.4rem;
  line-height: 1;
}

.expand-button:hover {
  color: var(--color-primary);
  border-color: rgba(255,255,255,0.2);
}

.detail-panel {
  grid-column: 1 / -1;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.detail-card {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}

.detail-card h3 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.detail-card p,
.detail-card li {
  color: var(--color-text);
}

.detail-card ul {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.view-panel {
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.view-panel h3 {
  font-family: var(--font-display);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: var(--text-xl);
}

.view-panel-subtitle {
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

.artist-song-grid {
  margin-top: var(--space-5);
  display: grid;
  gap: var(--space-3);
}

.artist-song-card {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}

.artist-song-card img {
  width: 84px;
  height: 84px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.artist-song-card button {
  text-align: left;
  color: var(--color-text);
  font-weight: 800;
}

.artist-song-card button:hover {
  color: var(--color-primary);
}

.history-list {
  display: grid;
  gap: var(--space-2);
  list-style: none;
  margin-top: var(--space-4);
}

.history-item {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-2);
  color: var(--color-text-muted);
}

.empty-state {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
}

@media (max-width: 1080px) {
  .hero-panel {
    grid-template-columns: 1fr;
  }

  .chart-row {
    grid-template-columns: 72px 88px minmax(0, 1fr) 96px 140px 44px;
  }

  .cover-wrap,
  .cover-image {
    width: 88px;
    height: 88px;
  }

  .rank-block {
    min-height: 88px;
  }
}

@media (max-width: 820px) {
  .page-shell {
    width: min(100% - 0.85rem, 1380px);
  }

  .site-header {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .header-actions {
    width: 100%;
    justify-content: stretch;
  }

  .picker-group {
    flex: 1 1 auto;
    min-width: 0;
  }

  .week-picker {
    min-width: 0;
    width: 100%;
  }

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .chart-row {
    grid-template-columns: 60px 76px minmax(0, 1fr) 44px;
    gap: var(--space-3);
    align-items: start;
  }

  .cover-wrap,
  .cover-image {
    width: 76px;
    height: 76px;
  }

  .rank-block {
    min-height: 76px;
  }

  .desktop-points {
    display: none;
  }

  .mobile-points {
    display: inline;
  }

  .meta-grid {
    grid-column: 2 / 4;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-2);
    margin-top: var(--space-1);
  }

  .meta-grid div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .expand-button {
    grid-column: 4 / 5;
    grid-row: 1 / span 2;
    justify-self: end;
    align-self: center;
  }

  .detail-panel {
    grid-template-columns: 1fr;
  }

  .artist-song-card {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .artist-song-card > span {
    display: none;
  }
}

@media (max-width: 640px) {
  .brand-block {
    gap: var(--space-3);
  }

  .brand-mark {
    width: 92px;
  }

  .site-header h1 {
    font-size: clamp(2rem, 1.6rem + 3vw, 2.8rem);
  }

  .hero-panel {
    padding: var(--space-4);
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .section-heading-row {
    align-items: start;
    flex-direction: column;
  }

  .ghost-button {
    width: 100%;
  }

  .view-panel {
    padding: var(--space-4);
  }

  .history-item {
    flex-direction: column;
    gap: var(--space-1);
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: calc(100% - 0.75rem);
    padding-top: var(--space-3);
  }

  .header-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 48px;
    align-items: end;
  }

  .chart-row {
    grid-template-columns: 52px 68px minmax(0, 1fr);
    gap: var(--space-3);
    padding: var(--space-3);
  }

  .cover-wrap,
  .cover-image {
    width: 68px;
    height: 68px;
  }

  .rank-block {
    min-height: 68px;
  }

  .song-main {
    gap: 0.25rem;
  }

  .song-title-link {
    font-size: 1.05rem;
  }

  .artist-link {
    font-size: 0.96rem;
  }

  .meta-grid {
    grid-column: 1 / -1;
    margin-top: var(--space-2);
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-divider);
  }

  .expand-button {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
  }

  .detail-panel {
    padding-top: var(--space-2);
  }

  .artist-song-card {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: var(--space-3);
    padding: var(--space-3);
  }

  .artist-song-card img {
    width: 60px;
    height: 60px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}