:root {
  --bg: #0f1020;
  --panel: rgba(255,255,255,0.08);
  --panel-solid: #17192b;
  --panel-soft: #1d2035;
  --text: #f5f7ff;
  --muted: #b9bfd9;
  --primary: #8a6de9;
  --secondary: #f6b5e0;
  --accent: #6ef0d3;
  --danger: #ff7171;
  --success: #7cf29a;
  --border: rgba(255,255,255,0.12);
  --shadow: 0 18px 40px rgba(0,0,0,0.25);
  --radius-lg: 28px;
  --radius-md: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Inter, system-ui, sans-serif; background: radial-gradient(circle at top left, #272a4f 0%, #0f1020 45%, #0b0c16 100%); color: var(--text); }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
.container { width: min(1220px, calc(100% - 32px)); margin: 0 auto; }
.container-shell { width: calc(100% - 24px); margin: 12px auto; }
.narrow-page { padding-top: 40px; padding-bottom: 40px; }
.hidden { display: none !important; }
.glass { background: var(--panel); backdrop-filter: blur(16px); border: 1px solid var(--border); box-shadow: var(--shadow); }
.glass-soft { background: var(--panel-soft); border: 1px solid var(--border); }
.site-header { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; border-radius: 24px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: 0.04em; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 16px; background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.brand-text { font-size: 1.05rem; }
.top-nav { display: flex; align-items: center; gap: 12px; }
.btn { border: 0; border-radius: 999px; padding: 12px 18px; font-weight: 600; cursor: pointer; transition: transform .2s ease, opacity .2s ease; display: inline-flex; align-items: center; justify-content: center; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: white; }
.btn-secondary { background: rgba(255,255,255,0.08); color: var(--text); border: 1px solid var(--border); }
.hero { min-height: calc(100vh - 120px); display: grid; grid-template-columns: 1.08fr .92fr; gap: 28px; align-items: center; padding: 42px 0 60px; }
.hero-copy h1 { font-size: clamp(3rem, 7vw, 5.6rem); line-height: 0.96; margin: 0 0 18px; max-width: 720px; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; color: var(--accent); font-size: .86rem; font-weight: 700; margin-bottom: 14px; }
.hero-text { max-width: 720px; color: var(--muted); font-size: 1.08rem; line-height: 1.8; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 4px; }
.hero-points span { padding: 10px 14px; border-radius: 999px; border: 1px solid var(--border); background: rgba(255,255,255,.05); color: var(--muted); }
.hero-actions { display: flex; gap: 12px; margin-top: 24px; }
.hero-card { padding: 24px; border-radius: var(--radius-lg); }
.mini-player { display: grid; grid-template-columns: 86px 1fr; gap: 16px; align-items: center; }
.mini-player h3 { margin: 0 0 8px; font-size: 1.9rem; }
.mini-player p { margin: 0; color: var(--muted); font-size: 1.12rem; }
.cover { width: 86px; height: 86px; border-radius: 22px; background-size: cover; background-position: center; background-image: linear-gradient(135deg, rgba(138,109,233,.7), rgba(246,181,224,.6)); }
.genre-pop { background-image: linear-gradient(135deg, rgba(138,109,233,.6), rgba(246,181,224,.6)); }
.genre-rock { background-image: linear-gradient(135deg, rgba(50,53,84,.85), rgba(138,109,233,.55)); }
.genre-jazz { background-image: linear-gradient(135deg, rgba(135,93,52,.65), rgba(246,181,224,.5)); }
.genre-hip-hop { background-image: linear-gradient(135deg, rgba(47,44,69,.55), rgba(110,240,211,.45)); }
.genre-acoustic, .genre-default { background-image: linear-gradient(135deg, rgba(138,109,233,.45), rgba(110,240,211,.35)); }
.mock-wave { margin: 24px 0; height: 74px; border-radius: 18px; background: repeating-linear-gradient(90deg, rgba(255,255,255,.08) 0 10px, transparent 10px 20px), linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.08)); }
.mini-task-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.mini-task { padding: 16px; border-radius: 18px; background: rgba(255,255,255,0.05); text-align: center; color: var(--muted); font-size: 1.02rem; }
.auth-page, .landing-page, .app-page { min-height: 100vh; }
.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 32px; }
.auth-panel { width: min(980px, 100%); display: grid; grid-template-columns: 1fr 1fr; border-radius: 32px; overflow: hidden; }
.auth-side { padding: 42px; }
.brand-side { background: linear-gradient(135deg, rgba(138,109,233,.5), rgba(246,181,224,.4)); }
.brand-side h1 { margin-top: 0; font-size: 3rem; }
.brand-side p { color: rgba(255,255,255,.92); line-height: 1.8; font-size: 1.06rem; }
.form-side { background: rgba(16,18,32,.88); }
.auth-form { display: grid; gap: 14px; }
.auth-form h2 { margin: 0 0 8px; }
.auth-form label { display: grid; gap: 8px; color: var(--muted); font-size: .96rem; }
.auth-form input, .auth-form textarea, .auth-form select,
.generator-form input, .generator-form textarea, .generator-form select { width: 100%; border-radius: 16px; border: 1px solid var(--border); background: rgba(255,255,255,0.06); color: var(--text); padding: 13px 14px; }
.form-message { min-height: 20px; font-size: .92rem; color: var(--secondary); }
.small-link { color: var(--muted); }
.dashboard-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; padding: 24px 0 36px; }
.panel { border-radius: 30px; padding: 24px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.panel-head.small { margin-bottom: 12px; }
.generator-form { display: grid; gap: 16px; }
.generator-form label { display: grid; gap: 8px; color: var(--muted); }
.generator-form textarea { resize: vertical; min-height: 128px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.result-shell { display: grid; gap: 18px; margin-top: 24px; }
.song-card { display: grid; grid-template-columns: 110px 1fr; gap: 16px; align-items: center; background: rgba(255,255,255,0.05); border-radius: 24px; padding: 18px; }
.song-card.large .cover { width: 110px; height: 110px; }
.song-card h3 { margin: 0; }
.song-card p { margin: 8px 0 0; color: var(--muted); }
.song-main { display: grid; gap: 14px; }
.lyrics-panel, .tasks-panel { border-radius: 24px; padding: 18px; }
#lyricsOutput { white-space: pre-wrap; line-height: 1.7; color: var(--muted); margin: 0; }
.badge { display: inline-flex; padding: 8px 12px; border-radius: 999px; background: rgba(110,240,211,.12); color: var(--accent); font-weight: 700; }
.tasks-stack { display: grid; gap: 16px; }
.task-card { background: rgba(255,255,255,0.05); border: 1px solid var(--border); border-radius: 22px; padding: 18px; display: grid; gap: 14px; }
.task-card.success { border-color: rgba(124,242,154,.6); opacity: .82; }
.task-card h4 { margin: 0; }
.match-shell { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.match-column { display: grid; gap: 10px; }
.match-card { background: rgba(255,255,255,0.06); color: var(--text); border: 1px solid transparent; border-radius: 16px; padding: 12px; cursor: pointer; transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.match-card:hover { transform: translateY(-2px); }
.match-card.selected { border-color: var(--secondary); background: rgba(246,181,224,.14); }
.match-card.correct { border-color: var(--success); background: rgba(124,242,154,.16); cursor: default; }
.match-card.wrong { border-color: var(--danger); background: rgba(255,113,113,.14); animation: shake .35s ease; }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-5px)} 50%{transform:translateX(6px)} 75%{transform:translateX(-3px)} }
.gap-grid, .scramble-grid, .record-grid { display: grid; gap: 12px; }
.input-chip { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.mock-recorder { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-radius: 16px; background: rgba(255,255,255,0.06); }
.rec-dot { width: 12px; height: 12px; border-radius: 999px; background: var(--danger); box-shadow: 0 0 0 0 rgba(255,113,113,.5); }
.rec-dot.live { animation: pulse 1.1s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(255,113,113,.55)} 100%{box-shadow:0 0 0 12px rgba(255,113,113,0)} }
.audio-pill { display:inline-flex; align-items:center; gap:8px; padding:8px 12px; border-radius:999px; background: rgba(110,240,211,.12); color: var(--accent); }
.summary-grid, .history-grid { display: grid; gap: 14px; }
.summary-grid { grid-template-columns: repeat(3, 1fr); margin-bottom: 18px; }
.summary-card, .history-card { background: rgba(255,255,255,0.05); border-radius: 20px; padding: 16px; border: 1px solid var(--border); }
.history-card audio { width: 100%; margin-top: 10px; }
.history-card .song-card { margin-bottom: 12px; }
.worksheet-box { display: grid; gap: 10px; }
.info-section { padding: 24px 0 40px; }
.section-title { margin-bottom: 20px; }
.section-title h2 { margin: 0; font-size: clamp(2rem, 4vw, 3rem); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-card, .value-card { border-radius: 24px; padding: 20px; }
.feature-num { display: inline-flex; width: 42px; height: 42px; align-items: center; justify-content: center; border-radius: 14px; background: rgba(255,255,255,.08); margin-bottom: 12px; font-weight: 700; color: var(--accent); }
.feature-card h3, .value-card h3 { margin: 0 0 10px; }
.feature-card p, .value-card p { margin: 0; color: var(--muted); line-height: 1.7; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
pre { white-space: pre-wrap; word-break: break-word; }
@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .value-grid, .dashboard-layout { grid-template-columns: 1fr; }
}
@media (max-width: 960px) {
  .auth-panel, .dashboard-layout, .match-shell, .two-col { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr; }
  .site-header { padding: 14px 18px; }
}
@media (max-width: 700px) {
  .hero-copy h1 { font-size: clamp(2.4rem, 14vw, 4.4rem); }
  .feature-grid, .value-grid, .mini-task-grid { grid-template-columns: 1fr; }
  .top-nav { gap: 8px; }
}