/* ── 변수 ─────────────────────────────────────────── */
:root {
  --bg:       #0f1117;
  --bg2:      #1a1d27;
  --bg3:      #232636;
  --border:   #2e3148;
  --primary:  #6366f1;
  --primary-h:#7c7ff5;
  --danger:   #ef4444;
  --success:  #22c55e;
  --text:     #e2e8f0;
  --text-dim: #94a3b8;
  --radius:   12px;
  --shadow:   0 4px 24px rgba(0,0,0,.4);
}

/* ── 리셋 & 베이스 ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-h); }

/* ── 레이아웃 ───────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }

.site-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: .85rem 0;
  position: sticky; top: 0; z-index: 100;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
}
.logo { font-size: 1.2rem; font-weight: 700; color: var(--text); }
nav { display: flex; gap: .75rem; align-items: center; }
.nav-link { color: var(--text-dim); font-size: .9rem; transition: color .2s; }
.nav-link:hover { color: var(--text); }
.nav-logout { color: var(--danger); }

main.container { flex: 1; padding-top: 2rem; padding-bottom: 3rem; }

.site-footer {
  text-align: center;
  font-size: .8rem;
  color: var(--text-dim);
  padding: 1rem 0;
  border-top: 1px solid var(--border);
}

/* ── 카드 ───────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.card-title {
  font-size: 1.05rem; font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text);
}

/* ── 폼 ─────────────────────────────────────────────── */
.form-group { margin-bottom: 1.1rem; }
.form-group label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .85rem; font-weight: 500; color: var(--text-dim);
  margin-bottom: .4rem;
}
.form-control {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: .6rem .85rem;
  font-size: .95rem;
  font-family: inherit;
  transition: border-color .2s, box-shadow .2s;
  resize: vertical;
}
.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.2);
}
select.form-control { cursor: pointer; }

.char-counter { font-size: .78rem; color: var(--text-dim); }
.tip { font-size: .75rem; color: var(--text-dim); font-weight: 400; }

/* ── 버튼 ───────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .6rem 1.4rem;
  border: none; border-radius: 8px;
  font-size: .95rem; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: background .2s, transform .1s, opacity .2s;
}
.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.btn-primary  { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-h); }
.btn-secondary { background: var(--bg3); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover:not(:disabled) { border-color: var(--primary); }
.btn-record   { background: var(--bg3); color: var(--text); border: 2px solid var(--border); }
.btn-record.recording { border-color: var(--danger); color: var(--danger); }

.btn-full { width: 100%; }
.btn-lg   { padding: .8rem 1.5rem; font-size: 1rem; }

.btn-icon {
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 1rem; padding: .25rem;
  transition: color .2s;
}
.btn-icon:hover { color: var(--danger); }

/* ── 탭 ─────────────────────────────────────────────── */
.tab-bar {
  display: flex; gap: .5rem; margin-bottom: .75rem;
}
.tab-btn {
  padding: .4rem 1rem;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-dim);
  font-size: .85rem; font-weight: 500; cursor: pointer;
  transition: all .2s;
}
.tab-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── 드래그 드롭 ────────────────────────────────────── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  color: var(--text-dim);
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(99,102,241,.06);
  color: var(--text);
}
.drop-zone svg { margin-bottom: .75rem; opacity: .6; }
.drop-zone p { font-size: .9rem; }
.drop-zone small { opacity: .7; }

/* ── 오디오 프리뷰 ──────────────────────────────────── */
.audio-preview {
  margin-top: .75rem;
  display: flex; align-items: center; gap: .75rem;
  background: var(--bg3); border-radius: 8px; padding: .5rem .75rem;
}
.audio-preview audio { flex: 1; height: 36px; }

/* ── 녹음 패널 ──────────────────────────────────────── */
.record-panel { display: flex; align-items: center; gap: 1rem; padding: .5rem 0; }
.rec-dot {
  display: inline-block; width: 10px; height: 10px;
  background: var(--danger); border-radius: 50%;
  animation: none;
}
.btn-record.recording .rec-dot {
  animation: pulse 1s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; } 50% { opacity: .2; }
}
.rec-timer { font-size: .9rem; color: var(--text-dim); font-variant-numeric: tabular-nums; }

/* ── 고급 설정 ──────────────────────────────────────── */
.advanced { margin-top: .5rem; }
.advanced summary {
  font-size: .85rem; color: var(--text-dim); cursor: pointer;
  padding: .4rem 0; user-select: none;
  transition: color .2s;
}
.advanced summary:hover { color: var(--text); }
.advanced-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: .75rem 1.5rem;
  padding: .75rem 0 .25rem;
}
.advanced-grid input[type="range"] {
  width: 100%; accent-color: var(--primary); cursor: pointer;
}
.val { font-weight: 700; color: var(--primary); margin-left: .3rem; }

/* ── 합성 상태 ──────────────────────────────────────── */
.synth-status {
  text-align: center; font-size: .85rem; color: var(--text-dim);
  margin-top: .6rem; min-height: 1.2em;
}

/* ── 스피너 ─────────────────────────────────────────── */
.spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── 결과 패널 ──────────────────────────────────────── */
.result-audio { width: 100%; margin-bottom: 1rem; }
.result-meta  { font-size: .82rem; color: var(--text-dim); margin-bottom: 1rem; }

/* ── 홈 그리드 ──────────────────────────────────────── */
.synth-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 820px) {
  .synth-grid { grid-template-columns: 3fr 2fr; align-items: start; }
}

/* ── 알림 ───────────────────────────────────────────── */
.alert {
  padding: .75rem 1rem; border-radius: 8px; font-size: .9rem;
  margin-bottom: 1rem;
}
.alert-error   { background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }
.alert-success { background: rgba(34,197,94,.12);  border: 1px solid rgba(34,197,94,.3);  color: #86efac; }

/* ── 상태 바 ────────────────────────────────────────── */
.status-bar {
  padding: .6rem 1rem; border-radius: 8px; font-size: .85rem;
  margin-bottom: 1.25rem;
}
.status-ok    { background: rgba(34,197,94,.1);  border: 1px solid rgba(34,197,94,.25);  color: #86efac; }
.status-error { background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3);  color: #fca5a5; }

/* ── 로그인 ─────────────────────────────────────────── */
.auth-wrap {
  display: flex; justify-content: center; align-items: center;
  min-height: calc(100vh - 120px);
}
.auth-card  { width: 100%; max-width: 400px; }
.auth-title { font-size: 1.8rem; text-align: center; margin-bottom: .25rem; }
.auth-subtitle { text-align: center; color: var(--text-dim); font-size: .9rem; margin-bottom: 1.5rem; }

/* ── 스크롤바 ───────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }