@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;1,300;1,400&family=IBM+Plex+Mono:wght@300;400;500&family=Noto+Sans+TC:wght@300;400;500&display=swap');

:root {
  --ink: #1a1812;
  --paper: #f5f0e8;
  --paper2: #ede8dc;
  --border: #c8bfa8;
  --accent: #8b3a2a;
  --accent2: #2a5a8b;
  --muted: #9a9080;
  --gold: #b89a4a;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Noto Sans TC', sans-serif;
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
}

.header {
  background: var(--ink);
  color: var(--paper);
  padding: 32px 48px 28px;
  display: flex;
  align-items: flex-end;
  gap: 32px;
  border-bottom: 3px solid var(--gold);
}

.header-text { flex: 1; }

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}

h1 {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 300;
  line-height: 1;
}

h1 em { font-style: italic; color: #d4a87a; }

.header-sub {
  font-size: 12px;
  color: #6b6560;
  margin-top: 8px;
  font-weight: 300;
}

.main { display: grid; grid-template-columns: 330px 1fr; min-height: calc(100vh - 110px); }

.sidebar {
  background: var(--ink);
  color: var(--paper);
  padding: 28px 24px;
  border-right: 1px solid #2a2820;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
}

.section-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #6b6560;
  margin-bottom: 10px;
}

.key-settings-bar {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.key-row {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  background: var(--paper2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 18px;
}

.key-cell {
  display: flex;
  flex-direction: column;
  gap: 5px;
}


.key-cell-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 8px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.key-cell-value {
  display: flex;
  align-items: center;
  gap: 7px;
}

.from-key-text {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.key-row select {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
  width: auto;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%239a9080'/%3E%3C/svg%3E");
}

#toKey {
  background: transparent;
  color: var(--ink);
}

.key-row select:focus {
  border-color: var(--accent2);
}

.key-arrow {
  color: var(--border);
  font-size: 14px;
  padding-top: 18px;
  flex-shrink: 0;
}

.key-cell-semitone {
  text-align: center;
  padding-left: 16px;
  border-left: 1px solid var(--border);
  min-width: 48px;
  flex-shrink: 0;
}

.key-semitone-val {
  font-family: 'Cormorant Garamond', serif;
  font-size: 28px;
  font-weight: 300;
  color: var(--accent2);
  line-height: 1;
}

.key-semitone-unit {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 7px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 3px;
}

select {
  width: 100%;
  background: #2a2820;
  border: 1px solid #3a3830;
  color: var(--paper);
  padding: 10px 12px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  border-radius: 3px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b6560'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.2s;
}

select:focus { outline: none; border-color: var(--gold); }


.upload-zone {
  border: 1px dashed #3a3830;
  border-radius: 4px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.upload-zone:hover, .upload-zone.drag { border-color: var(--gold); background: #1a1812; }

.upload-icon { font-size: 28px; margin-bottom: 8px; display: block; }

.upload-text { font-size: 12px; color: #6b6560; line-height: 1.6; }
.upload-text strong { color: var(--paper); font-weight: 400; }

#fileInput { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.pdf-name {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--gold);
  padding: 6px 10px;
  background: #1a1812;
  border-radius: 3px;
  word-break: break-all;
  margin-top: 8px;
}

.btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 3px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #a84432; }
.btn-primary:disabled { background: #3a3830; color: #6b6560; cursor: not-allowed; }

.btn-secondary {
  background: transparent;
  color: #6b6560;
  border: 1px solid #3a3830;
  margin-top: 8px;
}

.btn-secondary:hover { border-color: #6b6560; color: var(--paper); }

.divider {
  text-align: center;
  color: #3a3830;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
}

.manual-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #6b6560;
  margin-bottom: 6px;
}

textarea {
  width: 100%;
  background: #1a1812;
  border: 1px solid #3a3830;
  color: var(--paper);
  padding: 10px 12px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  line-height: 1.8;
  border-radius: 3px;
  resize: vertical;
  min-height: 80px;
  outline: none;
}

textarea:focus { border-color: var(--gold); }
textarea::placeholder { color: #4a4840; }

.status {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold);
  display: none;
  align-items: center;
  gap: 8px;
}

.status.visible { display: flex; }

.spinner {
  width: 12px; height: 12px;
  border: 1px solid #3a3830;
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

.content { padding: 32px; overflow-y: auto; }

.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 10px;
}

.content-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 20px;
  font-weight: 300;
}

.copy-btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover { border-color: var(--ink); color: var(--ink); }

.score-single {
  display: block;
}

.detected-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(184, 154, 74, 0.12);
  color: var(--gold);
  border: 1px solid rgba(184, 154, 74, 0.35);
  padding: 1px 5px;
  border-radius: 2px;
  vertical-align: middle;
}

.chord-line {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  align-items: baseline;
  min-height: 28px;
  padding: 7px 10px;
  background: var(--paper2);
  border-radius: 3px;
  border-left: 2px solid transparent;
  margin-bottom: 5px;
}

.chord-line.has-chords { border-left-color: var(--accent2); }

.chord-line.chord-line-cards {
  align-items: flex-end;
  min-height: auto;
  gap: 6px 10px;
  padding: 10px 12px;
}

.chord-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.chord-card-name {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--accent2);
  background: rgba(42,90,139,0.08);
  padding: 1px 5px;
  border-radius: 2px;
  white-space: nowrap;
}

.chord-token {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  white-space: pre;
}

.chord-token.orig {
  color: var(--accent);
  background: rgba(139,58,42,0.08);
  padding: 1px 4px;
  border-radius: 2px;
}

.chord-token.transposed {
  color: var(--accent2);
  background: rgba(42,90,139,0.08);
  padding: 1px 4px;
  border-radius: 2px;
}

.chord-token.lyric { color: var(--ink); font-weight: 300; font-size: 13px; }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--muted);
  text-align: center;
  gap: 12px;
}

.empty-icon { font-size: 48px; opacity: 0.3; }
.empty-text { font-size: 14px; line-height: 1.7; }

.error-state {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 300px;
  padding: 32px;
  gap: 12px;
}

.error-icon { font-size: 36px; }

.error-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.error-body {
  font-size: 13px;
  color: var(--ink);
  line-height: 1.8;
  white-space: pre-line;
}

.error-steps {
  font-size: 13px;
  color: var(--ink);
  line-height: 2;
  padding-left: 4px;
}

.error-steps li { list-style: none; }

.error-note {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  padding: 10px 14px;
  background: var(--paper2);
  border-radius: 3px;
  border-left: 2px solid var(--border);
  line-height: 1.6;
}

.library-select {
  margin-top: 4px;
  font-size: 11px;
}

.section-marker {
  margin: 18px 0 6px;
}

.section-marker-text {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  border-left: 2px solid var(--gold);
  padding-left: 7px;
}

@media (max-width: 700px) {
  .main { grid-template-columns: 1fr; }
  .header { padding: 24px; }
}