/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d0f14;
  --bg2: #13161d;
  --bg3: #1a1e28;
  --border: #252a38;
  --border2: #2e3448;
  --accent: #7c6af7;
  --accent2: #5b4fcf;
  --accent-glow: rgba(124, 106, 247, 0.15);
  --text: #e8eaf2;
  --text2: #9ba3bf;
  --text3: #5c6480;
  --success: #4caf82;
  --warning: #e8a94c;
  --danger: #e85c6a;
  --score-high: #4caf82;
  --score-mid: #e8a94c;
  --score-low: #e85c6a;
  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-w: 200px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* ─── Layout ────────────────────────────────────────────────────────────────── */
#app { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  gap: 0.5rem;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.5rem;
}
.logo-icon { font-size: 1.6rem; }
.logo-text { font-size: 0.95rem; font-weight: 700; color: var(--text); line-height: 1.3; }
.logo-text small { font-size: 0.75rem; color: var(--text3); font-weight: 400; }

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: none;
  background: transparent;
  color: var(--text2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  font-family: var(--font);
  transition: all 0.15s;
  text-align: left;
}
.nav-btn:hover { background: var(--bg3); color: var(--text); }
.nav-btn.active { background: var(--accent-glow); color: var(--accent); font-weight: 500; }
.nav-icon { font-size: 1rem; }

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 2.5rem;
  max-width: 1200px;
}

/* ─── Views ─────────────────────────────────────────────────────────────────── */
.view { display: none; }
.view.active { display: block; }

.view-header { margin-bottom: 2rem; }
.view-header h1 { font-size: 1.6rem; font-weight: 700; margin-bottom: 0.3rem; }
.subtitle { color: var(--text3); font-size: 0.9rem; }

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent2); }
.btn-ghost { background: var(--bg3); color: var(--text2); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--border2); }
.btn-big { padding: 0.75rem 1.75rem; font-size: 0.95rem; width: 100%; justify-content: center; margin-top: 1.25rem; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-icon { font-size: 1rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Forms ──────────────────────────────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.8rem; color: var(--text2); font-weight: 500; }
.form-group.big { margin-bottom: 1rem; }
.form-group.wide { grid-column: 1 / -1; }
.required { color: var(--accent); }

input[type="text"],
input[type="search"],
textarea,
select {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.875rem;
  padding: 0.55rem 0.85rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { resize: vertical; }
select { cursor: pointer; }
select option { background: var(--bg2); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.form-row-btns { display: flex; justify-content: flex-end; gap: 0.75rem; margin-top: 1rem; }
.hint { font-size: 0.78rem; color: var(--text3); font-weight: 400; }

/* ─── Upload ─────────────────────────────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--border2);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s;
}
.upload-area.drag-over { border-color: var(--accent); background: var(--accent-glow); }
.upload-inner { text-align: center; }
.upload-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.upload-inner p { color: var(--text2); margin-bottom: 0.75rem; }
.upload-hint { font-size: 0.78rem; color: var(--text3); margin-top: 0.5rem; }

.upload-form, .text-input-area {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.text-input-area h3 { margin-bottom: 1rem; font-size: 0.95rem; color: var(--text2); }
.text-input-area textarea { margin-bottom: 1rem; }

/* ─── Section Headers ────────────────────────────────────────────────────────── */
.section-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.section-title-row h2 { font-size: 1.1rem; font-weight: 600; }
.count-badge {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.1rem 0.6rem;
  font-size: 0.78rem;
  color: var(--text3);
}

/* ─── Cards Grid ─────────────────────────────────────────────────────────────── */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.cards-filter { display: flex; gap: 0.75rem; margin-bottom: 1rem; }
.cards-filter input { flex: 1; }
.cards-filter select { width: 200px; }

.material-card, .technique-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  transition: border-color 0.15s;
}
.material-card:hover, .technique-card:hover { border-color: var(--border2); }

.material-card .card-title { font-weight: 600; margin-bottom: 0.4rem; font-size: 0.9rem; }
.material-card .card-meta { font-size: 0.78rem; color: var(--text3); margin-bottom: 0.75rem; }
.material-card .card-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-bottom: 0.75rem; }
.tag { background: var(--bg3); border: 1px solid var(--border); border-radius: 20px; padding: 0.15rem 0.5rem; font-size: 0.72rem; color: var(--text3); }
.material-card .card-actions { display: flex; gap: 0.5rem; }

.technique-card .card-name { font-weight: 600; margin-bottom: 0.3rem; font-size: 0.875rem; }
.technique-card .card-mechanism {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 20px;
  padding: 0.1rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.technique-card .card-desc { font-size: 0.8rem; color: var(--text2); line-height: 1.5; margin-bottom: 0.5rem; }
.technique-card .card-strength { display: flex; align-items: center; gap: 0.4rem; font-size: 0.78rem; color: var(--text3); }
.strength-bar { height: 4px; background: var(--border); border-radius: 2px; flex: 1; overflow: hidden; }
.strength-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.3s; }
.technique-card .card-example { font-size: 0.78rem; color: var(--text3); border-left: 2px solid var(--border2); padding-left: 0.6rem; margin-top: 0.5rem; font-style: italic; }
.chunk-badge { font-size: 0.72rem; color: var(--text3); margin-bottom: 0.5rem; }
.processing-badge { font-size: 0.72rem; color: var(--warning); }

/* ─── Briefing Form ─────────────────────────────────────────────��────────────── */
.briefing-form { max-width: 720px; }
details.optional-fields { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin-bottom: 0; }
details.optional-fields summary {
  padding: 0.85rem 1.25rem;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.875rem;
  background: var(--bg2);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
details.optional-fields summary::-webkit-details-marker { display: none; }
details.optional-fields summary::before { content: '▶'; font-size: 0.65rem; color: var(--text3); transition: transform 0.2s; }
details[open].optional-fields summary::before { transform: rotate(90deg); }
.optional-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
}

/* ─── Result Cards ───────────────────────────────────────────────────────────── */
.result-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}
.result-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: var(--text); }
.plan-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }

.field-row { display: flex; flex-direction: column; gap: 0.2rem; padding: 0.65rem 0; border-bottom: 1px solid var(--border); }
.field-row:last-child { border-bottom: none; }
.field-label { font-size: 0.72rem; color: var(--text3); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.field-value { font-size: 0.875rem; color: var(--text); }

.beat-list { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.25rem; }
.beat-item { display: flex; gap: 0.75rem; align-items: flex-start; }
.beat-label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  background: var(--bg3); border: 1px solid var(--border); border-radius: 4px;
  padding: 0.15rem 0.4rem; color: var(--text3); white-space: nowrap; margin-top: 0.15rem;
}
.beat-content { font-size: 0.875rem; color: var(--text2); }

.cards-used { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.25rem; }
.card-chip {
  background: var(--accent-glow); border: 1px solid var(--accent);
  border-radius: 20px; padding: 0.2rem 0.6rem; font-size: 0.72rem; color: var(--accent);
}

/* ─── Variations Grid ────────────────────────────────────────────────────────── */
.variations-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin-bottom: 2rem; }

.variation-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s;
}
.variation-card.is-best { border-color: var(--accent); }

.variation-header {
  padding: 1rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.variation-label { font-weight: 700; font-size: 0.95rem; text-transform: capitalize; }
.score-badge {
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
}
.score-badge.high { background: rgba(76, 175, 130, 0.15); color: var(--score-high); }
.score-badge.mid { background: rgba(232, 169, 76, 0.15); color: var(--score-mid); }
.score-badge.low { background: rgba(232, 92, 106, 0.15); color: var(--score-low); }
.best-label { font-size: 0.7rem; color: var(--accent); font-weight: 600; margin-top: 0.2rem; }

.variation-content { padding: 1rem 1.25rem; flex: 1; }
.variation-text { font-size: 0.85rem; color: var(--text2); line-height: 1.7; white-space: pre-wrap; }
.flagged-phrase { background: rgba(232, 169, 76, 0.1); border-bottom: 1px dashed var(--warning); cursor: help; }

.variation-scores { padding: 0.75rem 1.25rem; border-top: 1px solid var(--border); }
.score-bars { display: flex; flex-direction: column; gap: 0.4rem; }
.score-row { display: flex; align-items: center; gap: 0.5rem; }
.score-label { font-size: 0.72rem; color: var(--text3); width: 80px; flex-shrink: 0; }
.score-bar-wrap { flex: 1; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.score-bar-fill { height: 100%; border-radius: 2px; transition: width 0.4s; }
.score-val { font-size: 0.72rem; color: var(--text3); width: 24px; text-align: right; }

.variation-diagnosis { padding: 0.75rem 1.25rem; border-top: 1px solid var(--border); }
.diagnosis-toggle { font-size: 0.78rem; color: var(--text3); cursor: pointer; }
.diagnosis-toggle:hover { color: var(--text2); }
.diagnosis-text { font-size: 0.8rem; color: var(--text2); margin-top: 0.5rem; line-height: 1.6; }

.variation-actions { padding: 0.75rem 1.25rem; border-top: 1px solid var(--border); display: flex; gap: 0.5rem; flex-wrap: wrap; }

.feedback-chips { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.feedback-chip {
  border: 1px solid var(--border); border-radius: 20px; padding: 0.2rem 0.6rem;
  font-size: 0.72rem; color: var(--text3); cursor: pointer; background: transparent;
  font-family: var(--font); transition: all 0.15s;
}
.feedback-chip:hover { border-color: var(--accent); color: var(--accent); }
.feedback-chip.selected { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }
.feedback-chip.approve { border-color: var(--success); color: var(--success); }
.feedback-chip.approve:hover, .feedback-chip.approve.selected { background: rgba(76, 175, 130, 0.1); }

.copy-btn {
  margin-left: auto;
  background: transparent; border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text3); cursor: pointer; font-size: 0.78rem; padding: 0.3rem 0.6rem;
  font-family: var(--font); transition: all 0.15s;
}
.copy-btn:hover { border-color: var(--border2); color: var(--text); }

/* ─── Rewrite Panel ──────────────────────────────────────────────────────────── */
.rewrite-panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 0.5rem;
}
.rewrite-panel h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.75rem; }
.rewrite-panel .form-row { grid-template-columns: 180px 1fr auto; align-items: end; gap: 0.75rem; margin-bottom: 0; }

/* ─── Metrics ──────────────────────────────────────────────���─────────────────── */
.metrics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; }
.metric-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.metric-value { font-size: 2rem; font-weight: 700; color: var(--accent); }
.metric-label { font-size: 0.8rem; color: var(--text3); margin-top: 0.25rem; }

/* ─── Empty State ────────────────────────────────────────────────────────────── */
.empty-state { text-align: center; padding: 4rem 2rem; color: var(--text3); }
.empty-state p { margin-bottom: 1.5rem; }

/* ─── Toast ──────────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text);
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.25s;
  pointer-events: none;
  z-index: 1000;
  max-width: 320px;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

/* ─── Loading ────────────────────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(13, 15, 20, 0.75);
  display: flex; align-items: center; justify-content: center; z-index: 999;
  backdrop-filter: blur(4px);
}
.loading-box {
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--radius); padding: 2rem 2.5rem;
  display: flex; flex-direction: column; align-items: center; gap: 1rem;
}
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-text { font-size: 0.9rem; color: var(--text2); }

/* ─── Scrollbar ──────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .variations-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .optional-grid { grid-template-columns: 1fr; }
  .rewrite-panel .form-row { grid-template-columns: 1fr; }
}