:root {
  --bg: #0a0a0f;
  --card: #12121d;
  --card-hover: #181826;
  --border: #1f1f30;
  --accent: #f87171;       /* 적색 — 진단은 후처리(분홍)와 차별 */
  --accent2: #fb923c;      /* 주황 */
  --accent3: #facc15;      /* 노랑 */
  --ok: #34d399;
  --err: #ef4444;
  --text: #e8e6e3;
  --muted: #8a8a9a;
  --dim: #555;
  --layer1: #34d399;       /* 후처리 (녹색 = 쉬움) */
  --layer2: #facc15;       /* 스타일 프롬프트 (노랑) */
  --layer3: #fb923c;       /* 가사 (주황) */
  --layer4: #ef4444;       /* 멜로디 (적색 = 심각) */
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { overflow-x: clip; margin: 0; padding: 0; width: 100%; }
body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  padding-top: 56px;
  min-height: 100vh;
}
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex; align-items: center; gap: 12px;
}
.nav .logo { color: var(--text); text-decoration: none; font-weight: 900; font-size: 15px; letter-spacing: 0.05em; }
.nav .badge {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; font-weight: 700; font-size: 10px;
  padding: 2px 10px; border-radius: 20px;
}
.nav .version { color: var(--dim); font-size: 11px; }
.nav-spacer { flex: 1; }
.user-box { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.user-box img { width: 28px; height: 28px; border-radius: 50%; }
.user-box .quota { background: var(--card); padding: 4px 10px; border-radius: 12px; font-size: 12px; color: var(--accent2); font-weight: 700; }

.hero { text-align: center; padding: 48px 20px 32px; background: linear-gradient(180deg, #1f1311 0%, #0a0a0f 100%); border-bottom: 1px solid var(--border); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle at 30% 40%, rgba(248,113,113,0.10) 0%, transparent 50%), radial-gradient(circle at 70% 60%, rgba(251,146,60,0.08) 0%, transparent 50%); pointer-events: none; }
.hero h1 { font-size: 28px; font-weight: 900; margin: 0 0 8px;
  background: linear-gradient(135deg, #f87171, #fb923c, #facc15);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p { color: var(--muted); font-size: 13px; margin: 0; }

.section { max-width: 720px; margin: 0 auto; padding: 24px 16px 40px; display: flex; flex-direction: column; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.card.center { text-align: center; }
.card h2 { margin: 0 0 12px; font-size: 18px; font-weight: 800; }
.card h3 { margin: 0 0 14px; font-size: 15px; font-weight: 700; color: var(--accent2); }
.card.error { border-color: var(--err); }
.card.error h3 { color: var(--err); }
.muted { color: var(--muted); }
.muted.small { font-size: 12px; line-height: 1.6; margin: 6px 0 14px; }
.hint { color: var(--dim); font-size: 11px; margin-top: 16px; }
.hidden { display: none !important; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; border: none; border-radius: 10px;
  padding: 14px 32px; font-size: 14px; font-weight: 800;
  font-family: inherit; cursor: pointer; transition: transform 0.1s, opacity 0.2s;
}
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary:not(:disabled):active { transform: scale(0.98); }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 8px; padding: 6px 14px; font-size: 12px; font-family: inherit; cursor: pointer; }
.btn-ghost:hover { color: var(--text); }
.btn-copy { background: linear-gradient(135deg, var(--accent2), var(--accent3)); color: #fff; border: none; border-radius: 8px; padding: 8px 14px; font-size: 12px; font-weight: 700; font-family: inherit; cursor: pointer; }
.btn-copy:active { transform: scale(0.97); }
.btn-link { background: linear-gradient(135deg, var(--ok), var(--layer1)); color: #fff; border: none; border-radius: 8px; padding: 10px 18px; font-size: 13px; font-weight: 800; font-family: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }

#gsiButton { display: flex; justify-content: center; margin: 20px 0 8px; }

.dropzone { border: 2px dashed var(--border); border-radius: 12px; padding: 36px 16px; text-align: center; cursor: pointer; transition: border-color 0.2s, background 0.2s; }
.dropzone:hover, .dropzone.dragover { border-color: var(--accent); background: rgba(248,113,113,0.04); }
.dz-icon { font-size: 32px; margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.dz-main { margin: 4px 0; font-size: 14px; font-weight: 600; }
.dz-sub { margin: 0; font-size: 11px; color: var(--muted); }
.file-info { display: flex; align-items: center; gap: 12px; margin-top: 12px; padding: 12px; background: var(--card-hover); border-radius: 8px; font-size: 13px; }
.fi-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fi-size { color: var(--muted); font-size: 11px; }

.progress-info { display: flex; justify-content: space-between; font-size: 12px; margin-bottom: 8px; }
.progress-info span:last-child { color: var(--accent2); font-weight: 700; }
.progress-bar { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent3)); width: 0%; transition: width 0.3s; }

/* Result */
.summary-card { padding: 28px 20px; }
.score { font-size: 56px; font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}
.score::after { content: ' / 100'; font-size: 18px; color: var(--muted); -webkit-text-fill-color: var(--muted); font-weight: 600; }
.genre { font-size: 16px; font-weight: 700; margin: 8px 0 4px; color: var(--text); }
.meta-line { font-size: 12px; color: var(--muted); margin: 0; }

#cards { display: flex; flex-direction: column; gap: 16px; margin-top: 16px; }

.diag-card { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--border); border-radius: 14px; padding: 20px; }
.diag-card.layer-postprocess  { border-left-color: var(--layer1); }
.diag-card.layer-style_prompt { border-left-color: var(--layer2); }
.diag-card.layer-lyric_fix    { border-left-color: var(--layer3); }
.diag-card.layer-melody_prompt{ border-left-color: var(--layer4); }
.diag-card h4 { margin: 0 0 4px; font-size: 14px; font-weight: 800; color: var(--text); }
.diag-card .layer-badge { display: inline-block; font-size: 10px; font-weight: 700; padding: 2px 8px; border-radius: 10px; margin-bottom: 10px; letter-spacing: 0.04em; }
.diag-card.layer-postprocess  .layer-badge { background: rgba(52,211,153,0.15);  color: var(--layer1); }
.diag-card.layer-style_prompt .layer-badge { background: rgba(250,204,21,0.15);  color: var(--layer2); }
.diag-card.layer-lyric_fix    .layer-badge { background: rgba(251,146,60,0.15);  color: var(--layer3); }
.diag-card.layer-melody_prompt.layer-badge { background: rgba(239,68,68,0.15);   color: var(--layer4); }
.diag-card.layer-melody_prompt .layer-badge { background: rgba(239,68,68,0.15);  color: var(--layer4); }

.issues-list { list-style: none; padding: 0; margin: 0 0 14px; }
.issues-list li { font-size: 13px; color: var(--muted); padding: 6px 0; border-bottom: 1px dashed var(--border); }
.issues-list li:last-child { border-bottom: none; }

.eq-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin: 10px 0 14px; padding: 12px; background: var(--card-hover); border-radius: 10px; font-family: 'Noto Sans KR', monospace; }
.eq-cell { text-align: center; }
.eq-cell .eq-band-name { font-size: 10px; color: var(--muted); }
.eq-cell .eq-band-val { font-size: 14px; font-weight: 800; margin-top: 2px; }
.eq-cell .eq-band-val.up { color: var(--ok); }
.eq-cell .eq-band-val.down { color: var(--accent); }
.eq-cell .eq-band-val.flat { color: var(--dim); }

.prompt-box { background: var(--card-hover); border: 1px dashed var(--border); border-radius: 8px; padding: 12px; font-family: 'Noto Sans KR', monospace; font-size: 12px; line-height: 1.6; color: var(--text); margin: 10px 0; word-break: keep-all; }

.lyric-items { display: flex; flex-direction: column; gap: 8px; }
.lyric-item { background: var(--card-hover); border-radius: 8px; padding: 10px 12px; font-size: 12px; }
.lyric-item .lyric-time { color: var(--accent3); font-weight: 800; margin-right: 8px; font-family: monospace; }
.lyric-item .lyric-heard { color: var(--text); }
.lyric-item .lyric-tip { color: var(--muted); font-size: 11px; margin-top: 4px; line-height: 1.5; }

.card-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.timestamps { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }
.timestamp { background: var(--card-hover); padding: 4px 10px; border-radius: 6px; font-size: 11px; font-family: monospace; color: var(--accent3); }

.footer { text-align: center; padding: 32px 16px 48px; color: var(--muted); font-size: 12px; border-top: 1px solid var(--border); margin-top: 24px; }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--text); }