:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #17202a;
  --muted: #617083;
  --line: #d9e0e7;
  --green: #1d8f74;
  --red: #c65347;
  --blue: #2f6fb2;
  --violet: #7a4fa3;
  --yellow: #b7791f;
  --shadow: 0 12px 30px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 1px solid #bdc7d3;
  background: #fff;
  color: var(--ink);
  min-height: 38px;
  padding: 0 14px;
  border-radius: 6px;
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: #8796a8;
  background: #f8fafc;
}

button:disabled {
  color: #98a2b3;
  cursor: not-allowed;
}

.app-shell {
  min-height: 100vh;
  padding: 18px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 auto 14px;
  max-width: 1480px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 24px;
  line-height: 1.15;
}

h2 {
  font-size: 16px;
}

#statusLine {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.top-actions select {
  min-width: 210px;
  height: 38px;
  border: 1px solid #bdc7d3;
  border-radius: 6px;
  padding: 0 10px;
  background: #fff;
}

.workspace {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr) 320px;
  gap: 16px;
  max-width: 1820px;
  margin: 0 auto;
}

.control-panel,
.main-panel,
.right-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.control-panel {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.drop-zone {
  min-height: 138px;
  border: 1px dashed #91a0af;
  border-radius: 8px;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 8px;
  padding: 14px;
  background: #f8fbfd;
  cursor: pointer;
}

.drop-zone.is-dragging {
  border-color: var(--blue);
  background: #eef6ff;
}

.drop-zone input {
  display: none;
}

.drop-title {
  font-weight: 700;
  font-size: 18px;
}

.drop-meta {
  color: var(--muted);
  font-size: 13px;
  word-break: break-word;
}

.field-label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.field-label input {
  height: 38px;
  border: 1px solid #bdc7d3;
  border-radius: 6px;
  padding: 0 10px;
  color: var(--ink);
}

#analyzeBtn {
  background: #17202a;
  color: #fff;
  border-color: #17202a;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stats-grid div {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  min-height: 70px;
}

.stats-grid span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.stats-grid strong {
  display: block;
  margin-top: 8px;
  font-size: 20px;
}

.export-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.process-panel {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  display: grid;
  gap: 8px;
}

.process-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.pipeline-badge {
  border: 1px solid #bdc7d3;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 12px;
  color: #475467;
  background: #f8fafc;
}

.pipeline-badge[data-status="full"] {
  color: #0f766e;
  border-color: #7bc5ba;
  background: #ecfdf8;
}

.pipeline-badge[data-status="current_model"] {
  color: #0f766e;
  border-color: #7bc5ba;
  background: #ecfdf8;
}

.pipeline-badge[data-status="degraded_grid"] {
  color: #8a5a14;
  border-color: #e5bd72;
  background: #fff8e6;
}

.pipeline-badge[data-status="fallback"] {
  color: #a33b2f;
  border-color: #e2a197;
  background: #fff5f3;
}

.pipeline-badge[data-status="heuristic"] {
  color: #8a5a14;
  border-color: #e5bd72;
  background: #fff8e6;
}

.method-line {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
  word-break: break-word;
}

.process-steps {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 7px;
  font-size: 12px;
}

.process-steps li strong,
.process-steps li span {
  display: block;
}

.process-steps li strong {
  color: #344054;
}

.process-steps li span {
  margin-top: 2px;
  color: var(--muted);
  line-height: 1.35;
}

.fallback-note span {
  color: #a33b2f;
}

.main-panel {
  min-width: 0;
  overflow: hidden;
}

.preview-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 14px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

#videoCanvas {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 6px;
  background: #111827;
  display: block;
}

.gei-video-overlay {
  position: absolute;
  border-radius: 6px;
  overflow: hidden;
  background: #000;
  z-index: 10;
  pointer-events: none;
}

.gei-video-overlay[hidden] {
  display: none;
}

.gei-video-overlay video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

#audioPlayer {
  width: 100%;
}

.media-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 38px;
}

.video-export-btn {
  background: #17202a;
  border-color: #17202a;
  color: #fff;
  min-width: 230px;
}

.video-export-btn:hover:not(:disabled) {
  background: #263241;
  border-color: #263241;
}

.record-hint {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.current-action {
  min-height: 30px;
  display: flex;
  align-items: center;
  max-width: 68%;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.timeline-wrap {
  max-height: calc(100vh - 430px);
  min-height: 260px;
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 9px 10px;
  vertical-align: top;
}

th {
  position: sticky;
  top: 0;
  background: #f8fafc;
  color: #475467;
  font-weight: 700;
  z-index: 1;
  text-align: left;
}

tr.is-active {
  background: #fff8e6;
}

.role-pill {
  display: inline-block;
  min-width: 104px;
  text-align: center;
  border-radius: 999px;
  padding: 3px 8px;
  color: #fff;
  font-size: 12px;
}

.music-pill,
.struct-pill {
  display: inline-block;
  min-width: 96px;
  text-align: center;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 12px;
  color: #fff;
}

.struct-pill {
  min-width: 74px;
  color: #475467;
  background: #eef2f6;
}

.music-intro {
  background: var(--blue);
}

.music-verse {
  background: var(--green);
}

.music-pre_chorus,
.music-pre_chorus_build {
  background: var(--yellow);
}

.music-chorus,
.music-post_chorus {
  background: var(--red);
}

.music-bridge,
.music-solo {
  background: var(--violet);
}

.music-instrumental_break,
.music-instrumental,
.music-interlude {
  background: #0f766e;
}

.music-outro,
.music-end,
.music-unknown {
  background: #64748b;
}

.role-keepspace {
  background: #6b7280;
}

.role-rhythmcall {
  background: var(--green);
}

.role-mix {
  background: var(--red);
}

.role-underground_gei {
  background: var(--violet);
}

.risk-high {
  color: #a33b2f;
  font-weight: 700;
}

.risk-medium {
  color: var(--yellow);
  font-weight: 700;
}

.editable-action {
  width: 100%;
  min-width: 160px;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 4px 6px;
  background: transparent;
}

.editable-action:focus {
  outline: none;
  border-color: #9db5d3;
  background: #fff;
}

@media (max-width: 1280px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .right-panel {
    order: 1;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-actions {
    width: 100%;
  }

  .top-actions select {
    min-width: 0;
    flex: 1;
  }

  .timeline-wrap {
    max-height: none;
  }
}

/* ─── Structure Editor ───────────────────────────────────────────── */

.right-panel {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
}

.right-panel[hidden] {
  display: none;
}

.structure-editor {
  margin-top: 0;
}

.structure-editor[hidden] {
  display: none;
}

.segment-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.segment-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  background: #f8fafc;
  border: 1px solid #d9e0e7;
  border-radius: 6px;
  font-size: 12px;
}

.segment-row:hover {
  border-color: #8796a8;
  background: #f1f4f8;
}

.seg-num {
  color: var(--muted);
  font-weight: 600;
  min-width: 22px;
  font-size: 11px;
}

.seg-time {
  width: 72px;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 12px;
  text-align: center;
  font-family: "Consolas", "Cascadia Code", monospace;
}

.seg-dash {
  color: var(--muted);
}

.seg-label {
  flex: 1;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 12px;
  background: #fff;
  color: var(--ink);
}

.seg-remove {
  border: none;
  background: none;
  color: #98a2b3;
  font-size: 18px;
  cursor: pointer;
  padding: 0 4px;
  min-height: auto;
  line-height: 1;
}

.seg-remove:hover {
  color: var(--red);
}

.seg-edited {
  color: var(--green);
  font-size: 12px;
}

.add-segment-btn {
  width: 100%;
  margin-top: 6px;
  border: 1px dashed #bdc7d3;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  padding: 6px;
  cursor: pointer;
}

.add-segment-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

/* ─── Action Search ──────────────────────────────────────────────── */

.action-cell {
  position: relative;
}

.action-search {
  width: 100%;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 12px;
  background: #fff;
  color: var(--ink);
  min-width: 120px;
}

.action-search:focus {
  outline: none;
  border-color: var(--blue);
}

.action-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid #d9e0e7;
  border-radius: 6px;
  box-shadow: var(--shadow);
  list-style: none;
  margin: 2px 0 0;
  padding: 4px;
  z-index: 100;
  max-height: 220px;
  overflow-y: auto;
}

.action-dropdown:empty,
.action-dropdown[hidden] {
  display: none;
}

.action-dropdown li {
  padding: 6px 8px;
  font-size: 12px;
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.action-dropdown li:hover,
.action-dropdown li:focus {
  background: #f1f4f8;
  outline: none;
}

.ac-cat {
  display: inline-block;
  font-size: 10px;
  padding: 0 5px;
  border-radius: 3px;
  font-weight: 600;
  text-transform: uppercase;
  min-width: 42px;
  text-align: center;
}

.ac-cat-keepspace { background: #e5e7eb; color: #475467; }
.ac-cat-rhythmcall { background: #d4f0e4; color: #1d8f74; }
.ac-cat-mix { background: #fce4e2; color: #c65347; }
.ac-cat-underground_gei { background: #ebe0f7; color: #7a4fa3; }

.ac-risk {
  margin-left: auto;
  font-size: 10px;
  color: var(--muted);
}

/* ─── Timeline Filters ──────────────────────────────────────────── */

.timeline-filters {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
}

.timeline-filters[hidden] {
  display: none;
}

.filter-chip {
  border: 1px solid #d9e0e7;
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 11px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  min-height: auto;
}

.filter-chip.active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.filter-chip:hover:not(.active) {
  border-color: #8796a8;
}

/* ─── Row number ────────────────────────────────────────────────── */

.row-num {
  color: var(--muted);
  font-size: 11px;
  text-align: center;
  width: 24px;
}

.text-cell {
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  color: var(--muted);
}

/* ─── Save button ────────────────────────────────────────────────── */

#saveBtn {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  font-weight: 600;
}

#saveBtn:hover:not(:disabled) {
  background: #0f172a;
  border-color: #0f172a;
}

#saveBtn:disabled {
  background: #e5e7eb;
  border-color: #d9e0e7;
  color: #98a2b3;
}

/* ─── Timeline time editing ─────────────────────────────────────── */

.time-cell {
  white-space: nowrap;
}

.time-inline {
  width: 64px;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 2px 4px;
  font-size: 12px;
  text-align: center;
  font-family: "Consolas", "Cascadia Code", monospace;
  color: var(--ink);
  background: #fff;
}

.time-inline:focus {
  outline: none;
  border-color: var(--blue);
}

.time-dash {
  color: var(--muted);
  margin: 0 2px;
}

.row-actions {
  white-space: nowrap;
  text-align: center;
}

.row-btn {
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  background: #fff;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  padding: 2px 6px;
  min-height: auto;
  line-height: 1.2;
}

.row-btn:hover {
  border-color: #8796a8;
  color: var(--ink);
}

.row-btn-add:hover {
  border-color: var(--green);
  color: var(--green);
}

.row-btn-del:hover {
  border-color: var(--red);
  color: var(--red);
}

tr.has-gei-video td:first-child {
  border-left: 3px solid #7a4fa3;
}

/* ---- notes panel ---- */
.notes-panel {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  display: grid;
  gap: 8px;
}

.notes-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.note-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  background: #f8fafc;
  border: 1px solid #d9e0e7;
  border-radius: 6px;
  font-size: 12px;
}

.note-row:hover {
  border-color: #8796a8;
  background: #f1f4f8;
}

.note-text {
  flex: 1;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 12px;
  background: #fff;
  color: var(--ink);
  min-width: 60px;
}

.note-text:focus {
  outline: none;
  border-color: var(--blue);
}

/* ═══ Landing Page ═══════════════════════════════════════════════════ */

.landing {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background: linear-gradient(135deg, #f0f4f8 0%, #e8edf2 100%);
}

.landing-hero {
  text-align: center;
  max-width: 640px;
  margin-bottom: 48px;
}

.landing-title {
  font-size: 56px;
  font-weight: 900;
  color: #17202a;
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}

.landing-sub {
  font-size: 22px;
  color: #617083;
  margin: 0 0 16px;
  font-weight: 600;
}

.landing-desc {
  font-size: 16px;
  color: #8796a8;
  line-height: 1.7;
  margin: 0;
}

.landing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 820px;
  width: 100%;
}

.landing-card {
  background: #fff;
  border: 1px solid #d9e0e7;
  border-radius: 12px;
  padding: 32px 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  box-shadow: 0 4px 16px rgba(16,24,40,0.06);
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.15s;
}

.landing-card:hover {
  border-color: #2f6fb2;
  box-shadow: 0 8px 28px rgba(16,24,40,0.12);
  transform: translateY(-2px);
}

.landing-card-icon {
  font-size: 42px;
  line-height: 1;
}

.landing-card h2 {
  font-size: 20px;
  font-weight: 700;
  color: #17202a;
  margin: 0;
}

.landing-card p {
  font-size: 14px;
  color: #617083;
  line-height: 1.6;
  margin: 0;
  flex: 1;
}

.landing-card-btn {
  display: inline-block;
  padding: 8px 20px;
  background: #17202a;
  color: #fff;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 4px;
}

@media (max-width: 640px) {
  .landing-cards {
    grid-template-columns: 1fr;
  }

  .landing-title {
    font-size: 40px;
  }
}

/* ═══ Back Link ══════════════════════════════════════════════════════ */

.back-link {
  color: #617083;
  text-decoration: none;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid #d9e0e7;
  white-space: nowrap;
}

.back-link:hover {
  border-color: #8796a8;
  color: #17202a;
}

/* ═══ MIX Builder ════════════════════════════════════════════════════ */

.builder-layout {
  display: grid;
  grid-template-columns: 380px minmax(0, 1fr);
  gap: 16px;
  max-width: 1480px;
  margin: 0 auto;
}

.builder-form-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-self: start;
}

.builder-preview-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: sticky;
  top: 18px;
  align-self: start;
}

.builder-section {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  display: grid;
  gap: 8px;
}

.builder-row {
  display: flex;
  gap: 8px;
}

.builder-row .field-label {
  margin: 0;
}

.bar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: #f8fafc;
  border: 1px solid #d9e0e7;
  border-radius: 6px;
}

.bar-num {
  font-size: 12px;
  font-weight: 700;
  color: #617083;
  min-width: 44px;
}

.bar-text {
  flex: 1;
  border: 1px solid #d9e0e7;
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 14px;
  background: #fff;
  color: var(--ink);
}

.bar-text:focus {
  outline: none;
  border-color: var(--blue);
}

.context-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.context-chip-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid #d9e0e7;
  border-radius: 999px;
  cursor: pointer;
  background: #fff;
  user-select: none;
}

.context-chip-label:has(:checked) {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.context-chip-check {
  display: none;
}

/* Preview card */

.preview-card {
  background: #050505;
  border-radius: 8px;
  padding: 28px 24px;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-name {
  font-size: 28px;
  font-weight: 800;
  color: #f8fafc;
}

.preview-cat {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  width: fit-content;
}

.preview-cat-mix { background: #c65347; color: #fff; }
.preview-cat-rhythmcall { background: #1d8f74; color: #fff; }
.preview-cat-underground_gei { background: #7a4fa3; color: #fff; }
.preview-cat-keepspace { background: #6b7280; color: #fff; }

.preview-bars {
  font-size: 14px;
  color: #a8b3c2;
}

.preview-text {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.preview-bar-line {
  font-size: 20px;
  font-weight: 700;
  color: #e5e7eb;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.preview-bar-num {
  color: #617083;
  font-size: 12px;
  margin-right: 8px;
}

@media (max-width: 900px) {
  .builder-layout {
    grid-template-columns: 1fr;
  }

  .builder-preview-panel {
    position: static;
  }
}