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

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #242836;
  --border: #2d3348;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --success: #22c55e;
  --success-hover: #16a34a;
  --danger: #ef4444;
  --radius: 10px;
  --sidebar-w: 220px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.logo {
  padding: 1.5rem 1.25rem;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: .5rem;
  border-bottom: 1px solid var(--border);
}

.logo-icon { color: var(--primary); font-size: 1.2rem; }

.nav { padding: .75rem; display: flex; flex-direction: column; gap: .25rem; }

.nav-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .65rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: .9rem;
  text-align: left;
  transition: all .15s;
}

.nav-item:hover { background: var(--bg-hover); color: var(--text); }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-icon { font-size: 1rem; }

/* Main */
.main { flex: 1; overflow: auto; padding: 2rem; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-header { margin-bottom: 1.5rem; }
.panel-header h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: .25rem; }
.panel-header p { color: var(--text-muted); font-size: .9rem; }

/* Generator */
.generator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  height: calc(100vh - 160px);
  min-height: 500px;
}

.chat-panel, .preview-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.msg {
  padding: .75rem 1rem;
  border-radius: var(--radius);
  font-size: .875rem;
  max-width: 95%;
}

.msg.system {
  background: var(--bg-hover);
  color: var(--text-muted);
  align-self: flex-start;
}

.msg.system ul { margin: .5rem 0 0 1.25rem; }
.msg.user { background: var(--primary); color: #fff; align-self: flex-end; }
.msg.assistant { background: var(--bg-hover); align-self: flex-start; }
.msg.assistant.full-width { max-width: 100%; width: 100%; }

.reasoning-block {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg);
}

.reasoning-block summary {
  cursor: pointer;
  padding: .55rem .75rem;
  font-weight: 600;
  font-size: .82rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: .4rem;
  user-select: none;
}

.reasoning-block summary::-webkit-details-marker { display: none; }

.reasoning-block summary::before {
  content: "▶";
  font-size: .65rem;
  color: var(--text-muted);
  transition: transform .15s;
}

.reasoning-block[open] summary::before { transform: rotate(90deg); }

.reasoning-badge {
  font-size: .72rem;
  font-weight: 500;
  color: var(--primary);
  margin-left: auto;
}

.reasoning-badge.paused { color: #f59e0b; }
.reasoning-badge.done { color: var(--success); }

.reasoning-content {
  margin: 0;
  padding: .65rem .75rem;
  border-top: 1px solid var(--border);
  font-size: .78rem;
  line-height: 1.55;
  max-height: 280px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-muted);
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

.reasoning-content.empty {
  font-style: italic;
  color: var(--text-muted);
  opacity: .7;
}

.btn-stop {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.btn-stop:hover:not(:disabled) { opacity: .88; }

.chat-input-area {
  border-top: 1px solid var(--border);
  padding: 1rem;
}

.chat-input-area textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .75rem;
  font-size: .9rem;
  resize: vertical;
  font-family: inherit;
}

.chat-input-area textarea:focus { outline: none; border-color: var(--primary); }

.gen-model-bar {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-top: .75rem;
  flex-wrap: wrap;
}

.gen-model-bar label {
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

#genModelSelect {
  flex: 1;
  min-width: 180px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .45rem .65rem;
  font-size: .85rem;
}

#genModelSelect:focus { outline: none; border-color: var(--primary); }

.gen-model-status {
  font-size: .78rem;
  white-space: nowrap;
}

.gen-model-status.ok { color: var(--success); }
.gen-model-status.warn { color: #f59e0b; }

.chat-actions {
  display: flex;
  gap: .75rem;
  margin-top: .75rem;
  align-items: center;
  flex-wrap: wrap;
}

.title-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .5rem .75rem;
  font-size: .875rem;
}

.chat-input-area textarea.input-error,
.title-input.input-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(239, 68, 68, .25);
}

.preview-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.toolbar-label { font-size: .875rem; font-weight: 600; }
.toolbar-actions { display: flex; gap: .5rem; }

.preview-container { flex: 1; position: relative; background: #fff; }

#previewFrame {
  width: 100%;
  height: 100%;
  border: none;
  position: absolute;
  top: 0; left: 0;
}

.preview-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: .9rem;
  background: #f8fafc;
}

.preview-empty.hidden { display: none; }

/* Buttons */
.btn {
  padding: .5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-hover);
  color: var(--text);
  cursor: pointer;
  font-size: .875rem;
  transition: all .15s;
  white-space: nowrap;
}

.btn:hover:not(:disabled) { background: var(--border); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { background: var(--success-hover); }
.btn-sm { padding: .35rem .75rem; font-size: .8rem; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { opacity: .85; }

.hidden { display: none !important; }

/* Tables */
.table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
}

.data-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.data-table th {
  text-align: left;
  padding: .75rem 1rem;
  background: var(--bg-hover);
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: rgba(99,102,241,.05); }
.empty-row { text-align: center; color: var(--text-muted); padding: 2rem !important; }

.table-actions { display: flex; gap: .5rem; }
.badge {
  display: inline-block;
  padding: .15rem .5rem;
  border-radius: 20px;
  font-size: .75rem;
  background: var(--bg-hover);
}
.badge-yes { background: rgba(34,197,94,.15); color: var(--success); }
.badge-no { background: rgba(148,163,184,.15); color: var(--text-muted); }
.badge-draft { background: rgba(245,158,11,.15); color: #f59e0b; }

.data-preview {
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-muted);
  font-size: .8rem;
}

.data-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.data-filters {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  min-width: 220px;
}

.data-filters label {
  font-size: .875rem;
  font-weight: 600;
}

.data-filters select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .6rem .75rem;
  font-size: .9rem;
}

.data-filters select:focus {
  outline: none;
  border-color: var(--primary);
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.pagination-info {
  font-size: .875rem;
  color: var(--text-muted);
}

/* Settings */
.settings-form {
  max-width: 480px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  margin-bottom: .4rem;
  font-size: .875rem;
  font-weight: 600;
}

.form-group input, .form-group select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: .6rem .75rem;
  font-size: .9rem;
}

.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.api-key-wrap {
  display: flex;
  gap: .5rem;
  align-items: center;
}

.api-key-wrap input { flex: 1; }

.hint { display: block; margin-top: .35rem; color: var(--text-muted); font-size: .8rem; }

#modelCustom { margin-top: .5rem; }
.save-hint { margin-left: .75rem; color: var(--success); font-size: .875rem; }

/* Modal */
.modal { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.6); }
.modal-content {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 90%;
  max-width: 420px;
  z-index: 1;
}
.modal-lg { max-width: 600px; }
.modal-content h2 { font-size: 1.15rem; margin-bottom: .75rem; }
.modal-content p { color: var(--text-muted); font-size: .875rem; margin-bottom: 1rem; }
.modal-content code { background: var(--bg); padding: .15rem .4rem; border-radius: 4px; font-size: .8rem; }
.modal-actions { display: flex; justify-content: flex-end; gap: .5rem; margin-top: 1.25rem; }

.data-detail {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  font-size: .8rem;
  overflow: auto;
  max-height: 400px;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-all;
}

/* Toast */
.toast {
  position: fixed;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: .85rem 1.5rem;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  z-index: 2000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, .35);
  opacity: 0;
  animation: toast-in .25s ease forwards;
  max-width: min(90vw, 480px);
  text-align: center;
}

@keyframes toast-in {
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.toast.success {
  background: #14532d;
  border-color: var(--success);
  color: #bbf7d0;
}

.toast.error {
  background: #7f1d1d;
  border-color: var(--danger);
  color: #fecaca;
}

/* Responsive */
@media (max-width: 900px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
  .nav { flex-direction: row; overflow-x: auto; }
  .generator-layout { grid-template-columns: 1fr; height: auto; }
  .chat-panel { min-height: 350px; }
  .preview-panel { min-height: 400px; }
}