/* ===== CSS Variables (Dark/Light themes) ===== */
:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-hover: #1f2b47;
  --bg-active: #253352;
  --bg-card: #1a1a2e;
  --bg-input: #16213e;
  --bg-modal: #1a1a2e;
  --bg-drop: rgba(99, 102, 241, 0.05);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f0f1a;

  --border-color: #2d3a5c;
  --border-light: #1e2a4a;

  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-muted: rgba(99, 102, 241, 0.15);

  --success: #22c55e;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --sidebar-width: 280px;
  --header-height: 56px;

  --transition: 0.2s ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #e2e8f0;
  --bg-active: #dbeafe;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --bg-modal: #ffffff;
  --bg-drop: rgba(99, 102, 241, 0.05);

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-light: #f1f5f9;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: relative;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.sidebar-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}

/* Storage bar */
.storage-bar {
  position: relative;
  width: 160px;
  height: 22px;
  background: var(--bg-tertiary);
  border-radius: 11px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.storage-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 11px;
  transition: width 0.4s ease;
  width: 0%;
}

.storage-bar-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  pointer-events: none;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* ===== App Layout ===== */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.btn-join {
  margin: 12px;
  flex-shrink: 0;
}

.folders-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 8px;
}

.folders-list::-webkit-scrollbar {
  width: 4px;
}

.folders-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.folder-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 2px;
}

.folder-item:hover {
  background: var(--bg-hover);
}

.folder-item.active {
  background: var(--accent-muted);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.folder-item-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-muted);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.85rem;
}

.folder-item-info {
  flex: 1;
  min-width: 0;
}

.folder-item-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-item-code {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

/* ===== Content Area ===== */
.content {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-primary);
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-tertiary);
  padding: 20px;
  text-align: center;
}

.empty-state h2 {
  font-size: 1.25rem;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 0.9rem;
  max-width: 340px;
}

/* Folder view */
.folder-view {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.folder-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.folder-header-info {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.folder-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.folder-name {
  font-size: 1.1rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-code-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
}

.folder-code {
  font-size: 0.8rem;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ===== Deploy Panel ===== */
.deploy-panel {
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.deploy-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  padding: 0 16px;
}

.deploy-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-tertiary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.deploy-tab:hover {
  color: var(--text-primary);
}

.deploy-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.deploy-tab-content {
  display: none;
  padding: 14px 16px;
}

.deploy-tab-content.active {
  display: block;
}

.deploy-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.deploy-form-row {
  display: flex;
  gap: 10px;
}

.deploy-input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.deploy-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.deploy-input::placeholder {
  color: var(--text-tertiary);
}

.deploy-select {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  min-width: 90px;
}

.deploy-select:focus {
  border-color: var(--accent);
}

.deploy-textarea {
  width: 100%;
  min-height: 120px;
  max-height: 300px;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.82rem;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  line-height: 1.5;
  outline: none;
  resize: vertical;
  transition: var(--transition);
}

.deploy-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.deploy-textarea::placeholder {
  color: var(--text-tertiary);
  font-family: inherit;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  color: var(--text-tertiary);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.drop-zone p {
  font-size: 0.85rem;
}

.drop-zone .link {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  font-weight: 500;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-muted);
  color: var(--accent);
}

/* ===== Page List ===== */
.page-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
}

.page-list-container::-webkit-scrollbar {
  width: 5px;
}

.page-list-container::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.page-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-list-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-tertiary);
  padding: 40px 20px;
  text-align: center;
}

.page-list-empty p {
  font-size: 0.9rem;
}

/* Page card */
.page-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
  animation: fadeSlideIn 0.25s ease;
}

.page-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #fff;
}

.page-icon.html {
  background: linear-gradient(135deg, #f97316, #ea580c);
}

.page-icon.text {
  background: linear-gradient(135deg, #64748b, #475569);
}

.page-info {
  flex: 1;
  min-width: 0;
}

.page-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.page-type-badge {
  display: inline-flex;
  padding: 1px 7px;
  border-radius: 20px;
  font-size: 0.68rem;
  font-weight: 600;
  background: var(--accent-muted);
  color: var(--accent);
}

.page-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

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

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon.danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--bg-modal);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.2s ease;
}

.modal-lg {
  max-width: 700px;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 700;
}

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
}

/* Form */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.edit-textarea {
  min-height: 300px;
  max-height: 500px;
  resize: vertical;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  line-height: 1.5;
}

.form-hint {
  font-size: 0.72rem;
  color: var(--text-tertiary);
}

.optional {
  font-weight: 400;
  color: var(--text-tertiary);
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
  pointer-events: none;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  pointer-events: auto;
  max-width: 360px;
}

.toast.success {
  background: var(--success);
  color: #fff;
}

.toast.error {
  background: var(--danger);
  color: #fff;
}

.toast.info {
  background: var(--accent);
  color: #fff;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(40px); }
}

/* ===== Sidebar overlay (mobile) ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background: rgba(0, 0, 0, 0.5);
  z-index: 49;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar-toggle {
    display: flex;
  }

  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar.open + .sidebar-overlay {
    display: block;
  }

  .storage-bar {
    width: 110px;
  }

  .folder-header {
    padding: 10px 14px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .page-list-container {
    padding: 12px 14px;
  }

  .deploy-form-row {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .storage-bar {
    display: none;
  }
}