/* ==============================================================================
   QCD Learn • Modern Cyber/Tech PWA Theme (Dark Mode)
   ============================================================================== */

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131b2e;
  --bg-tertiary: #1e293b;
  --border-color: #334155;
  --border-focus: #06b6d4;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

:root[data-theme-mode="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --border-color: #cbd5e1;
  --border-focus: #0891b2;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-cyan: #0891b2;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  color-scheme: light;
}

:root[data-theme-mode="light"] pre {
  background: #f1f5f9;
  border-color: var(--border-color);
}
:root[data-theme-mode="light"] pre code {
  color: #1e293b;
}
:root[data-theme-mode="light"] code {
  background: rgba(0, 0, 0, 0.06);
  color: #0369a1;
}
:root[data-theme-mode="light"] .drill-card:hover {
  background: #f1f5f9;
}
:root[data-theme-mode="light"] .modal-backdrop {
  background: rgba(15, 23, 42, 0.5);
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
}

/* Header */
.app-header {
  height: 60px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 50;
}

.header-left { display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-emerald));
  color: #000;
  font-weight: 900;
  font-size: 13px;
  padding: 5px 8px;
  border-radius: 6px;
  letter-spacing: 0.5px;
}
.brand-info h1 {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}
.header-version-badge {
  font-size: 10px;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.12);
  padding: 2px 5px;
  border-radius: 4px;
}

.header-model-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  color: var(--text-secondary);
  position: relative;
  cursor: pointer;
  margin-top: 2px;
}
.header-model-select {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.status-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}
.status-indicator.online { background-color: var(--accent-emerald); box-shadow: 0 0 6px var(--accent-emerald); }

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

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 6px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.icon-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

/* Chat Viewport */
.chat-viewport {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

/* Welcome Container */
.welcome-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: auto 0;
  padding: 24px 12px;
}
.welcome-badge {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}
.welcome-container h2 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
}
.welcome-desc {
  color: var(--text-secondary);
  font-size: 13px;
  max-width: 520px;
  line-height: 1.5;
  margin-bottom: 24px;
}

/* Drill Cards Grid */
.drill-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 620px;
  margin-bottom: 20px;
}
.drill-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 14px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}
.drill-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  background: #17223b;
}
.drill-card-icon { font-size: 20px; margin-bottom: 6px; }
.drill-card-title { font-size: 13px; font-weight: 700; color: var(--text-primary); margin-bottom: 3px; }
.drill-card-desc { font-size: 11px; color: var(--text-muted); line-height: 1.4; }

/* Quick Pills */
.quick-pills-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 600px;
}
.quick-pill {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.15s;
}
.quick-pill:hover {
  border-color: var(--accent-emerald);
  color: var(--text-primary);
}

/* Messages List */
.messages-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}
.message-row {
  display: flex;
  flex-direction: column;
  max-width: 88%;
}
.message-row.user {
  align-self: flex-end;
}
.message-row.ai {
  align-self: flex-start;
  max-width: 96%;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.6;
}
.message-row.user .message-bubble {
  background: #0284c7;
  color: #fff;
  border-bottom-right-radius: 2px;
}
.message-row.ai .message-bubble {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-bottom-left-radius: 2px;
}

/* Code & Pre Blocks */
pre, code {
  font-family: var(--font-mono);
}
code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  color: #38bdf8;
}
pre {
  background: #050811;
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 10px 0;
}
pre code {
  background: transparent;
  padding: 0;
  color: #e2e8f0;
}

/* Status Labels */
.badge-ok, .badge-pass { color: var(--accent-emerald); font-weight: 700; }
.badge-fail, .badge-err { color: var(--accent-rose); font-weight: 700; }
.badge-next { color: var(--accent-cyan); font-weight: 700; }
.badge-diff { color: var(--accent-amber); font-weight: 700; }

/* Bottom Dock */
.app-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 8px 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quick-actions-bar {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
}
.quick-action-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 12px;
  white-space: nowrap;
  cursor: pointer;
}
.quick-action-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
}

.input-container {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 4px 8px;
  gap: 8px;
}
.input-container:focus-within {
  border-color: var(--accent-cyan);
}
textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  resize: none;
  max-height: 120px;
  line-height: 1.4;
  padding: 4px;
}
.send-btn {
  background: var(--accent-cyan);
  color: #000;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.1s;
}
.send-btn:hover { transform: scale(1.05); }

/* Modals & Drawers */
.hidden { display: none !important; }
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal-dialog {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 460px;
  overflow: hidden;
}
.modal-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-body { padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.modal-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}
.primary-btn {
  background: var(--accent-cyan);
  color: #000;
  border: none;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 12px; color: var(--text-secondary); font-weight: 600; }
.form-group input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
}
.form-group small { font-size: 11px; color: var(--text-muted); }

.quota-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.quota-card h4 { font-size: 12px; color: var(--accent-emerald); margin-bottom: 4px; }

/* Drawer */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 80;
}
.drawer-sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: 320px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  z-index: 90;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
}
.drawer-sidebar.open { transform: translateX(0); }
.drawer-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.drawer-content { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; }

.kata-item-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: 8px;
  text-align: left;
  color: var(--text-primary);
  cursor: pointer;
}
.kata-item-btn:hover { border-color: var(--accent-cyan); }
.kata-item-title { font-weight: 700; font-size: 13px; color: var(--accent-cyan); margin-bottom: 2px; }
.kata-item-desc { font-size: 11px; color: var(--text-secondary); }

@media (max-width: 600px) {
  .drill-cards-grid { grid-template-columns: 1fr; }
  .message-row { max-width: 95%; }
}