/* =========================================================
   Vocalyric — style.css
   Dark-first, mobile-first, Miku-mint × Vocaloid-pink
   ========================================================= */

/* ── 0. CSS Variables ─────────────────────────────────── */
:root {
  --mint:   #00FFD5;
  --pink:   #FF66B2;
  --mint-d: #00c4a3;
  --pink-d: #d94d93;

  /* dark mode (default) */
  --bg:       #0a0e14;
  --bg2:      #111720;
  --bg3:      #1a2231;
  --surface:  #161d2a;
  --border:   #1f2d3f;
  --text:     #e8edf5;
  --text-sub: #7a8fa8;
  --text-dim: #3f5168;

  --radius:   14px;
  --radius-sm:8px;
  --header-h: 60px;
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
  --shadow: 0 4px 24px rgba(0,0,0,.5);
}

[data-theme="light"] {
  --bg:       #f4f7fb;
  --bg2:      #ffffff;
  --bg3:      #eaf0f9;
  --surface:  #ffffff;
  --border:   #dde5f0;
  --text:     #111827;
  --text-sub: #4b5a70;
  --text-dim: #a0b0c4;
  --shadow: 0 4px 24px rgba(0,0,0,.1);
}

/* ── 1. Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans KR', 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
ul { list-style: none; }

/* ── 2. Scrollbar ─────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ── 3. Header ────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 16px;
  max-width: 480px;
  margin: 0 auto;
}

.logo {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--text);
}

.logo-v {
  color: var(--mint);
  font-style: italic;
}

.icon-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  color: var(--text-sub);
  transition: color var(--transition), background var(--transition);
}

.icon-btn:hover { color: var(--mint); background: rgba(0,255,213,.08); }
.icon-btn svg { width: 20px; height: 20px; }

/* hamburger */
.hamburger-line {
  display: block; width: 18px; height: 2px;
  background: currentColor; border-radius: 2px;
  margin: 3px 0;
  transition: transform var(--transition), opacity var(--transition);
}

/* Search Bar */
.search-bar {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  border-top: 1px solid transparent;
}

.search-bar.open {
  max-height: 70px;
  border-color: var(--border);
  padding: 8px 16px 12px;
}

.search-inner {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 8px 14px;
  max-width: 480px;
  margin: 0 auto;
}

.search-icon { width: 16px; height: 16px; color: var(--text-dim); flex-shrink: 0; }

#searchInput {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-size: 0.9rem;
  font-family: inherit;
}

#searchInput::placeholder { color: var(--text-dim); }

.clear-btn {
  color: var(--text-dim); font-size: 0.8rem;
  transition: color var(--transition);
  opacity: 0;
  pointer-events: none;
}

.clear-btn.visible { opacity: 1; pointer-events: auto; }
.clear-btn:hover { color: var(--pink); }

/* ── 4. Side Menu ─────────────────────────────────────── */
.menu-overlay {
  position: fixed; inset: 0; z-index: 199;
  background: rgba(0,0,0,.6);
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
  backdrop-filter: blur(4px);
}

.menu-overlay.open { opacity: 1; pointer-events: auto; }

.side-menu {
  position: fixed; top: 0; right: -280px; bottom: 0;
  width: 260px; z-index: 200;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  transition: right var(--transition);
}

.side-menu.open { right: 0; }

.side-menu-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
}

.side-menu-list { padding: 12px 8px; flex: 1; }

.menu-link {
  display: block; padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem; color: var(--text-sub);
  transition: background var(--transition), color var(--transition);
}

.menu-link:hover, .menu-link.active {
  background: rgba(0,255,213,.08);
  color: var(--mint);
}

.side-menu-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
}

.theme-toggle {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg3);
  color: var(--text-sub); font-size: 0.9rem;
  transition: background var(--transition), color var(--transition);
}

.theme-toggle:hover { color: var(--mint); }

/* ── 5. Main Wrap ─────────────────────────────────────── */
.main-wrap {
  padding-top: var(--header-h);
  max-width: 480px;
  margin: 0 auto;
  min-height: calc(100vh - var(--header-h));
}

.view { padding-bottom: 80px; }
.view.hidden { display: none; }

/* ── 6. Hero Section ──────────────────────────────────── */
.hero {
  position: relative;
  padding: 48px 24px 40px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.3;
  mask-image: linear-gradient(to bottom, transparent, rgba(0,0,0,.8) 30%, rgba(0,0,0,.6) 70%, transparent);
}

.hero-content { position: relative; z-index: 1; }

.hero-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mint);
  background: rgba(0,255,213,.1);
  border: 1px solid rgba(0,255,213,.25);
  border-radius: 40px;
  padding: 4px 12px;
  margin-bottom: 16px;
}

.hero-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2rem; font-weight: 900; line-height: 1.15;
  margin-bottom: 14px;
  color: var(--text);
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--mint), var(--pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 0.85rem; line-height: 1.7;
  color: var(--text-sub); margin-bottom: 28px;
}

/* ── 7. Buttons ───────────────────────────────────────── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  border-radius: 40px;
  background: linear-gradient(135deg, var(--mint), #00c4a3);
  color: #0a0e14;
  font-family: 'Orbitron', sans-serif;
  font-weight: 700; font-size: 0.8rem; letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 20px rgba(0,255,213,.25);
}

.btn-primary svg { width: 16px; height: 16px; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 30px rgba(0,255,213,.45); }
.btn-primary:active { transform: translateY(0); }

.pulse {
  animation: pulse-anim 2.5s ease-in-out infinite;
}

@keyframes pulse-anim {
  0%, 100% { box-shadow: 0 0 20px rgba(0,255,213,.25); }
  50% { box-shadow: 0 0 40px rgba(0,255,213,.55), 0 0 80px rgba(0,255,213,.15); }
}

/* ── 8. Deco Circles ──────────────────────────────────── */
.hero-deco {
  position: absolute; inset: 0; pointer-events: none; overflow: hidden;
}

.deco-circle {
  position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: 0.12;
}

.c1 { width: 220px; height: 220px; background: var(--mint); top: -60px; right: -60px; }
.c2 { width: 140px; height: 140px; background: var(--pink); bottom: 0; right: 60px; }
.c3 { width: 100px; height: 100px; background: var(--mint); bottom: -20px; left: 20px; }

/* ── 9. Section Label ─────────────────────────────────── */
.section-label {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 20px 12px;
  border-bottom: 1px solid var(--border);
  margin: 0 16px 16px;
}

/* ── 10. Song Grid & Cards ────────────────────────────── */
.song-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 0 16px;
}

.song-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 14px 12px;
  cursor: pointer;
  transition: border-color var(--transition), transform 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
  animation: card-in 0.4s ease both;
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.song-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--mint), var(--pink));
  opacity: 0;
  transition: opacity var(--transition);
}

.song-card:hover::before, .song-card:focus::before { opacity: 1; }
.song-card:hover { border-color: rgba(0,255,213,.3); transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,.3); }
.song-card:active { transform: translateY(-1px); }

.card-emoji {
  font-size: 1.6rem; margin-bottom: 10px; display: block;
}

.card-title {
  font-size: 0.82rem; font-weight: 500; line-height: 1.35;
  margin-bottom: 4px; color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-artist {
  font-size: 0.72rem; color: var(--mint);
  font-family: 'Space Mono', monospace;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.card-count {
  font-size: 0.68rem; color: var(--text-dim);
  margin-top: 8px;
  font-family: 'Space Mono', monospace;
}

.fav-btn {
  position: absolute; top: 10px; right: 10px;
  font-size: 0.9rem; line-height: 1;
  transition: transform 0.2s;
  z-index: 2;
}

.fav-btn:hover { transform: scale(1.3); }
.fav-btn.active { color: var(--pink); }

/* ── 11. View Header ──────────────────────────────────── */
.view-header { padding: 24px 20px 16px; }
.view-title { font-family: 'Orbitron', sans-serif; font-size: 1.1rem; font-weight: 700; }

.empty-msg {
  text-align: center; color: var(--text-sub); font-size: 0.88rem;
  line-height: 1.7; padding: 48px 24px;
}

.empty-msg.hidden { display: none; }

/* ── 12. Detail View ──────────────────────────────────── */
.detail-back {
  padding: 16px 16px 0;
}

.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-sub); font-size: 0.85rem;
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  transition: color var(--transition), background var(--transition);
}

.back-btn svg { width: 18px; height: 18px; }
.back-btn:hover { color: var(--mint); background: rgba(0,255,213,.08); }

.detail-card {
  margin: 12px 16px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: card-in 0.3s ease;
}

.detail-hero {
  padding: 28px 24px 22px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.detail-hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(0,255,213,.06), rgba(255,102,178,.06));
  pointer-events: none;
}

.detail-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem; letter-spacing: 0.12em;
  color: var(--mint); text-transform: uppercase;
  margin-bottom: 8px;
}

.detail-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.25rem; font-weight: 700;
  line-height: 1.25; margin-bottom: 8px;
}

.detail-artist {
  font-size: 0.85rem; color: var(--mint);
  font-family: 'Space Mono', monospace;
}

.detail-fav-btn {
  position: absolute; top: 20px; right: 20px;
  font-size: 1.4rem;
  transition: transform 0.2s;
}

.detail-fav-btn:hover { transform: scale(1.2); }
.detail-fav-btn.active { color: var(--pink); }

/* ── 13. Lyrics Column Headers ────────────────────────── */
.lyrics-legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.lyrics-legend-item {
  padding: 10px 20px;
  font-size: 0.65rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-dim);
  font-family: 'Space Mono', monospace;
  border-right: 1px solid var(--border);
}

.lyrics-legend-item:last-child { border-right: none; }

.hint-label {
  display: block;
  font-size: 0.6rem; color: var(--text-dim); margin-top: 2px;
  font-style: italic;
}

/* ── 14. Lyric Rows ───────────────────────────────────── */
.lyric-list { list-style: none; }

.lyric-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}

.lyric-row:last-child { border-bottom: none; }
.lyric-row:hover { background: rgba(0,255,213,.04); }
.lyric-row.revealed { background: rgba(0,255,213,.05); }

.lyric-jp-block, .lyric-kr-block {
  padding: 16px 20px;
}

.lyric-jp-block {
  border-right: 1px solid var(--border);
}

.lyric-original {
  font-size: 0.95rem; line-height: 1.5;
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  margin-bottom: 4px;
}

.lyric-kana {
  font-size: 0.75rem; color: var(--text-dim);
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.5;
}

.lyric-note {
  margin-top: 6px;
  display: inline-block;
  font-size: 0.65rem;
  background: rgba(0,255,213,.1);
  color: var(--mint);
  border: 1px solid rgba(0,255,213,.2);
  border-radius: 4px;
  padding: 2px 7px;
  font-family: 'Space Mono', monospace;
}

.lyric-kr-block {
  display: flex; flex-direction: column; justify-content: center;
}

.lyric-kr {
  font-size: 0.88rem; line-height: 1.55;
  color: var(--text);
  transition: opacity var(--transition), filter var(--transition);
}

/* Hidden state */
.lyric-kr.hidden-kr {
  opacity: 0;
  filter: blur(6px);
  user-select: none;
}

.lyric-row.revealed .lyric-kr.hidden-kr {
  opacity: 1;
  filter: none;
}

.reveal-hint {
  font-size: 0.68rem; color: var(--text-dim);
  font-style: italic; margin-top: 4px;
  transition: opacity var(--transition);
}

.lyric-row.revealed .reveal-hint { opacity: 0; height: 0; overflow: hidden; }

/* ── 15. Tooltip ──────────────────────────────────────── */
.tooltip {
  position: fixed; z-index: 999;
  background: var(--bg3);
  border: 1px solid var(--mint);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.78rem; color: var(--text);
  pointer-events: none;
  opacity: 0; transform: translateY(4px);
  transition: opacity 0.2s, transform 0.2s;
  max-width: 200px; line-height: 1.4;
  box-shadow: 0 4px 16px rgba(0,255,213,.15);
}

.tooltip.visible { opacity: 1; transform: translateY(0); }

/* ── 16. Word Highlight ───────────────────────────────── */
.word {
  cursor: help;
  border-bottom: 1px dashed rgba(0,255,213,.5);
  transition: color var(--transition);
}

.word:hover { color: var(--mint); }

/* ── 17. Footer ───────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 20px;
  font-size: 0.75rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  max-width: 480px;
  margin: 0 auto;
}

.accent { color: var(--mint); }

/* ── 18. Responsive — wider screens ──────────────────────*/
@media (min-width: 520px) {
  .main-wrap, .site-header .header-inner,
  .site-footer {
    max-width: 480px;
  }

  body::before {
    content: '';
    display: block;
    position: fixed; top: 0; bottom: 0;
    left: 0; right: calc(100% - 50% + 240px + 1px);
    border-right: 1px solid var(--border);
    pointer-events: none; z-index: -1;
  }
  body::after {
    content: '';
    display: block;
    position: fixed; top: 0; bottom: 0;
    left: calc(50% + 240px); right: 0;
    border-left: 1px solid var(--border);
    pointer-events: none; z-index: -1;
  }
}

/* ── 19. Animations ───────────────────────────────────── */
@keyframes fade-in {
  from { opacity: 0; } to { opacity: 1; }
}

.fade-in { animation: fade-in 0.35s ease; }

/* ── 20. Accessibility ────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* Stagger delay for grid cards */
.song-card:nth-child(1) { animation-delay: 0.00s; }
.song-card:nth-child(2) { animation-delay: 0.05s; }
.song-card:nth-child(3) { animation-delay: 0.10s; }
.song-card:nth-child(4) { animation-delay: 0.15s; }
.song-card:nth-child(5) { animation-delay: 0.20s; }
.song-card:nth-child(6) { animation-delay: 0.25s; }