/* =====================
   CSS VARIABLES / THEMES
   ===================== */
:root {
  --bg:           #0a0a0a;
  --bg-card:      #111111;
  --bg-card-hover:#161616;
  --bg-controls:  #0f0f0f;
  --border:       #222222;
  --border-hover: #333333;
  --accent:       #1DB954;
  --accent-dim:   rgba(29, 185, 84, 0.12);
  --accent-glow:  rgba(29, 185, 84, 0.25);
  --text-primary: #f2f2f2;
  --text-secondary:#888888;
  --text-muted:   #444444;
  --tag-bg:       #1a1a1a;
  --tag-border:   #2a2a2a;
  --shadow:       0 4px 24px rgba(0,0,0,0.5);
  --shadow-hover: 0 8px 40px rgba(0,0,0,0.7);
  --font-display: 'Syne', sans-serif;
  --font-mono:    'DM Mono', monospace;
  --radius:       12px;
  --transition:   0.2s ease;
}

[data-theme="light"] {
  --bg:           #f5f4f0;
  --bg-card:      #ffffff;
  --bg-card-hover:#fafafa;
  --bg-controls:  #eeede9;
  --border:       #e0deda;
  --border-hover: #c8c5bf;
  --accent:       #1a9e48;
  --accent-dim:   rgba(26, 158, 72, 0.08);
  --accent-glow:  rgba(26, 158, 72, 0.2);
  --text-primary: #111111;
  --text-secondary:#666666;
  --text-muted:   #aaaaaa;
  --tag-bg:       #eeede9;
  --tag-border:   #dddbd6;
  --shadow:       0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 6px 24px rgba(0,0,0,0.14);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-display);
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* =====================
   HEADER
   ===================== */
.main-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-controls);
  border-bottom: 1px solid var(--border);
  padding: 28px 40px 20px;
  backdrop-filter: blur(12px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
}

.header-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.title {
  font-size: clamp(22px, 3.5vw, 38px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-primary);
}

.header-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* THEME TOGGLE */
.theme-toggle {
  background: var(--tag-bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition);
  flex-shrink: 0;
  margin-top: 4px;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* =====================
   CONTROLS
   ===================== */
.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.control-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-right: 10px;
  white-space: nowrap;
}

/* SEARCH */
.search-wrap {
  position: relative;
  max-width: 360px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 10px 14px 10px 36px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* GENRE BUTTONS */
.filter-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.genre-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.genre-btn {
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 20px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 5px 14px;
  transition: all var(--transition);
}

.genre-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.genre-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000000;
  font-weight: 600;
}

/* SORT */
.sort-wrap {
  display: flex;
  align-items: center;
}

.sort-select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 12px;
  outline: none;
  transition: border-color var(--transition);
}

.sort-select:focus,
.sort-select:hover {
  border-color: var(--accent);
}

/* RESULTS COUNT */
.results-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 14px;
  letter-spacing: 0.06em;
}

/* =====================
   CARD GRID
   ===================== */
#card-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 32px 40px 60px;
}

/* =====================
   CARD
   ===================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color 0.3s ease;
  cursor: default;
  animation: fadeUp 0.35s ease both;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-content {
  padding: 20px;
}

/* CARD NUMBER */
.card-number {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

/* CARD TITLE + ARTIST */
.card-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 3px;
  line-height: 1.3;
}

.card-artist {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

/* CARD TAGS ROW */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag {
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  color: var(--text-secondary);
}

.tag.genre-tag {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* BPM BAR */
.bpm-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.bpm-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.bpm-bar-track {
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.bpm-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.4s ease;
}

.bpm-value {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* STREAMS */
.card-streams {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.card-streams span {
  color: var(--text-secondary);
}

/* ANNOTATION */
.card-annotation {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  font-style: italic;
}

.card-annotation::before {
  content: '"';
  color: var(--accent);
  font-size: 18px;
  line-height: 0;
  vertical-align: -4px;
  margin-right: 2px;

}

.card-annotation::after {
  content: '"';
  color: var(--accent);
  font-size: 18px;
  line-height: 0;
  vertical-align: -4px;
  margin-right: 2px;

}

/* =====================
   EMPTY STATE
   ===================== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 13px;
}

.empty-state p:first-child {
  font-size: 32px;
  margin-bottom: 12px;
}

/* =====================
   FOOTER
   ===================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 20px 40px;
  display: flex;
  gap: 10px;
  transition: border-color 0.3s ease;
}

.footer button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 16px;
  transition: all var(--transition);
}

.footer button:hover {
  border-color: #e55;
  color: #e55;
}

@media (min-width: 601px) {
  .back-to-top {
    display: none;
  }
}

/* =====================
   RESPONSIVE
   ===================== */
@media (max-width: 600px) {
  .main-header {
    position: relative;
    padding: 16px 16px 12px;
  }

  .title {
    font-size: 20px;
  }

  .header-sub {
    font-size: 10px;
  }

  .header-top {
    margin-bottom: 14px;
  }

  .controls {
    gap: 10px;
  }

  .search-wrap {
    max-width: 100%;
  }

  .genre-btn {
    font-size: 10px;
    padding: 4px 10px;
  }

  .sort-select {
    font-size: 11px;
    padding: 6px 10px;
  }

  #card-container {
    padding: 20px 16px 40px;
    grid-template-columns: 1fr;
  }

  .footer {
    padding: 16px;
  }

  .back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  color: #000;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 200;
  }

  .back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
  }
}