/* ============================================================
   DPV Transportation — RFP Proposal Writer
   Brand-aligned design system
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
  --dpv-green: #7FB551;
  --dpv-green-dark: #6A9A42;
  --dpv-green-light: #A3D477;
  --dpv-green-bg: rgba(127, 181, 81, 0.08);
  --dpv-blue: #24D3C6;
  --dpv-blue-light: #78E8DF;
  --dpv-dark: #1A1A2E;
  --dpv-dark-lighter: #252542;
  --dpv-dark-lightest: #2F2F52;
  --dpv-grey: #F2F2F2;
  --dpv-grey-medium: #D9D9D9;
  --dpv-grey-dark: #888;
  --accent-blue: #2E5D8A;
  --accent-blue-light: #3A75AE;
  --light-blue: #D5E8F0;

  --white: #FFFFFF;
  --black: #111111;
  --text-primary: #1A1A2E;
  --text-secondary: #555;
  --text-muted: #888;
  --border-color: #E0E0E0;
  --border-light: #F0F0F0;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --sidebar-width: 280px;
  --header-height: 0px;
  --transition: 0.2s ease;
  --transition-slow: 0.35s ease;

  --font-family: 'Arial', 'Museo Sans', 'Helvetica Neue', sans-serif;
}

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

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--dpv-grey);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--accent-blue-light);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
}
h1 { font-size: 1.8rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }

p { margin-bottom: 0.5em; }

img { max-width: 100%; }

/* --- App Layout (Sidebar + Main) --- */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--dpv-dark);
  color: var(--white);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-header {
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--dpv-dark-lightest);
}

.logo {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: 3px;
  margin-bottom: 4px;
}
.logo-d { color: var(--dpv-green); }
.logo-p { color: var(--dpv-blue); }
.logo-v { color: var(--white); }

.app-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  margin-top: 2px;
  letter-spacing: 0.3px;
}

.tagline {
  font-size: 0.72rem;
  color: var(--dpv-blue);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-top: 4px;
  font-weight: 600;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 2px;
  cursor: pointer;
}
.nav-item:hover {
  background: var(--dpv-dark-lighter);
  color: var(--white);
}
.nav-item.active {
  background: var(--dpv-green);
  color: var(--white);
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.nav-divider {
  height: 1px;
  background: var(--dpv-dark-lightest);
  margin: 14px 8px;
}

.nav-section-label {
  padding: 4px 16px 8px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: rgba(255, 255, 255, 0.35);
  font-weight: 700;
}

.nav-proposal-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.82rem;
  transition: all var(--transition);
  cursor: pointer;
}
.nav-proposal-link:hover {
  background: var(--dpv-dark-lighter);
  color: var(--white);
}
.nav-proposal-link.active {
  color: var(--dpv-green-light);
  background: var(--dpv-dark-lighter);
}
.nav-proposal-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--dpv-dark-lightest);
}
.sidebar-footer-text {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.3);
  text-align: center;
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  padding: 32px 40px 60px;
  background: var(--dpv-grey);
}

/* --- App Footer --- */
.app-footer {
  display: none; /* Shown in sidebar-footer instead */
}

/* --- Cards --- */
.card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-body {
  padding: 24px;
}
.card-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--dpv-green);
  color: var(--white);
}
.btn-primary:hover:not(:disabled) {
  background: var(--dpv-green-dark);
  box-shadow: 0 4px 12px rgba(127, 181, 81, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--dpv-green);
  border: 1.5px solid var(--dpv-green);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--dpv-green-bg);
}

.btn-accent {
  background: var(--accent-blue);
  color: var(--white);
}
.btn-accent:hover:not(:disabled) {
  background: var(--accent-blue-light);
  box-shadow: 0 4px 12px rgba(46, 93, 138, 0.3);
}

.btn-danger {
  background: #DC3545;
  color: var(--white);
}
.btn-danger:hover:not(:disabled) {
  background: #C82333;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 14px;
}
.btn-ghost:hover:not(:disabled) {
  background: var(--dpv-grey);
  color: var(--text-primary);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
}

/* --- Form Inputs --- */
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: 0.2px;
}
.form-label .optional {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.78rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--text-primary);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--dpv-green);
  box-shadow: 0 0 0 3px rgba(127, 181, 81, 0.15);
}
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--dpv-grey-dark);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.9rem;
}
.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--dpv-green);
  cursor: pointer;
}

/* --- Status Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  white-space: nowrap;
}

.badge-uploaded {
  background: var(--dpv-grey);
  color: var(--dpv-grey-dark);
  border: 1px solid var(--dpv-grey-medium);
}
.badge-analyzed {
  background: var(--light-blue);
  color: var(--accent-blue);
  border: 1px solid rgba(46, 93, 138, 0.2);
}
.badge-generating {
  background: var(--light-blue);
  color: var(--accent-blue);
  border: 1px solid rgba(46, 93, 138, 0.2);
  animation: pulse-badge 1.8s ease-in-out infinite;
}
@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.badge-draft_ready, .badge-draft-ready {
  background: var(--dpv-green-bg);
  color: var(--dpv-green-dark);
  border: 1px solid rgba(127, 181, 81, 0.3);
}
.badge-in_review, .badge-in-review {
  background: #FFF3E0;
  color: #E65100;
  border: 1px solid rgba(230, 81, 0, 0.2);
}
.badge-final {
  background: var(--dpv-dark);
  color: var(--white);
}

.badge-deadline-warning {
  background: #FFF8E1;
  color: #F9A825;
  border: 1px solid rgba(249, 168, 37, 0.3);
}
.badge-deadline-urgent {
  background: #FFEBEE;
  color: #C62828;
  border: 1px solid rgba(198, 40, 40, 0.25);
}

/* --- Tables --- */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table th {
  background: var(--dpv-grey);
  padding: 12px 16px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
}
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}
.data-table tr:last-child td {
  border-bottom: none;
}
.data-table tr:hover td {
  background: rgba(127, 181, 81, 0.03);
}
.data-table .link-cell {
  color: var(--accent-blue);
  font-weight: 600;
  cursor: pointer;
}
.data-table .link-cell:hover {
  color: var(--dpv-green);
  text-decoration: underline;
}

/* --- Drag & Drop Upload Zone --- */
.upload-zone {
  border: 2.5px dashed var(--dpv-grey-medium);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-slow);
  background: var(--white);
  position: relative;
}
.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--dpv-green);
  background: var(--dpv-green-bg);
}
.upload-zone.drag-over {
  transform: scale(1.01);
  box-shadow: 0 0 0 4px rgba(127, 181, 81, 0.15);
}
.upload-zone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  color: var(--dpv-grey-dark);
  transition: color var(--transition);
}
.upload-zone:hover .upload-zone-icon,
.upload-zone.drag-over .upload-zone-icon {
  color: var(--dpv-green);
}
.upload-zone-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.upload-zone-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.file-selected {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--dpv-green-bg);
  border: 1px solid rgba(127, 181, 81, 0.3);
  border-radius: var(--radius-sm);
  margin-top: 16px;
}
.file-selected-icon {
  width: 24px;
  height: 24px;
  color: var(--dpv-green);
}
.file-selected-name {
  font-weight: 600;
  font-size: 0.9rem;
  flex: 1;
}
.file-selected-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 4px;
  transition: color var(--transition);
}
.file-selected-remove:hover {
  color: #DC3545;
}

/* --- Editor Layout --- */
.editor-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  align-items: start;
}

.editor-toc {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
}
.editor-toc-header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}
.editor-toc-list {
  padding: 8px;
}
.toc-item {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.83rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  cursor: pointer;
  border-left: 3px solid transparent;
}
.toc-item:hover {
  background: var(--dpv-grey);
  color: var(--text-primary);
}
.toc-item.active {
  background: var(--dpv-green-bg);
  color: var(--dpv-green-dark);
  border-left-color: var(--dpv-green);
  font-weight: 600;
}

.editor-main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Editor Toolbar */
.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 24px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}
.editor-toolbar-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.editor-toolbar-title {
  font-size: 1.2rem;
  font-weight: 700;
}
.editor-toolbar-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}
.editor-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Section Cards */
.section-card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.section-card:hover {
  box-shadow: var(--shadow-md);
}

.section-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border-light);
  cursor: pointer;
  user-select: none;
}
.section-card-header:hover {
  background: rgba(0, 0, 0, 0.01);
}
.section-card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-card-title {
  font-size: 1rem;
  font-weight: 700;
}
.section-type-badge {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  background: var(--light-blue);
  color: var(--accent-blue);
}
.section-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.section-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform var(--transition);
}
.section-toggle.collapsed {
  transform: rotate(-90deg);
}

.section-card-body {
  padding: 22px;
  max-height: 2000px;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}
.section-card-body.collapsed {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.section-content {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-primary);
}
.section-content h1,
.section-content h2,
.section-content h3 {
  margin-top: 1em;
  margin-bottom: 0.4em;
}
.section-content ul, .section-content ol {
  margin: 0.5em 0;
  padding-left: 1.5em;
}
.section-content li {
  margin-bottom: 0.3em;
}
.section-content p {
  margin-bottom: 0.8em;
}
.section-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}
.section-content table th,
.section-content table td {
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  text-align: left;
  font-size: 0.85rem;
}
.section-content table th {
  background: var(--dpv-grey);
  font-weight: 700;
}

/* Comments */
.comments-area {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
}
.comments-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.comments-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.comment-thread {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.comment-item {
  display: flex;
  gap: 12px;
  padding: 12px;
  background: var(--dpv-grey);
  border-radius: var(--radius-sm);
}
.comment-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--dpv-green);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}
.comment-content {
  flex: 1;
  min-width: 0;
}
.comment-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.comment-author {
  font-size: 0.82rem;
  font-weight: 700;
}
.comment-time {
  font-size: 0.72rem;
  color: var(--text-muted);
}
.comment-resolved {
  font-size: 0.65rem;
  padding: 1px 6px;
  border-radius: 8px;
  background: var(--dpv-green-bg);
  color: var(--dpv-green-dark);
  font-weight: 700;
}
.comment-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.comment-form {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}
.comment-form .form-textarea {
  min-height: 60px;
  font-size: 0.85rem;
}
.comment-form .btn {
  align-self: flex-end;
}

/* --- CTA / Empty States --- */
.empty-state {
  text-align: center;
  padding: 80px 40px;
}
.empty-state-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  color: var(--dpv-grey-medium);
}
.empty-state-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.empty-state-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.generate-cta {
  text-align: center;
  padding: 60px 40px;
  background: linear-gradient(135deg, var(--dpv-green-bg), rgba(36, 211, 198, 0.05));
  border: 2px dashed var(--dpv-green);
  border-radius: var(--radius-lg);
}
.generate-cta-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.generate-cta-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* --- Export Page --- */
.export-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.export-stat {
  background: var(--dpv-grey);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}
.export-stat-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--dpv-green);
}
.export-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-top: 2px;
}

.export-sections-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 16px 0;
}
.export-section-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--dpv-grey);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}
.export-section-title {
  font-weight: 600;
}
.export-section-words {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.export-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 0;
}

/* --- Loading Overlay --- */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow);
}
.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  text-align: center;
  color: var(--white);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--dpv-green);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-spinner p {
  font-size: 0.95rem;
  font-weight: 500;
}

/* Inline spinner (for buttons, etc.) */
.spinner-inline {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
.spinner-inline.dark {
  border-color: rgba(0, 0, 0, 0.1);
  border-top-color: var(--dpv-green);
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 400px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.88rem;
  font-weight: 500;
  animation: toast-in 0.35s ease;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}
.toast.removing {
  opacity: 0;
  transform: translateX(100%);
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast-success {
  background: var(--dpv-green);
  color: var(--white);
}
.toast-error {
  background: #DC3545;
  color: var(--white);
}
.toast-info {
  background: var(--accent-blue);
  color: var(--white);
}
.toast-warning {
  background: #F9A825;
  color: var(--black);
}

/* --- Modal --- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.6);
  backdrop-filter: blur(3px);
  z-index: 8000;
  transition: opacity var(--transition);
}
.modal-backdrop.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 8001;
  width: 90%;
  max-width: 480px;
  transition: opacity var(--transition), transform var(--transition);
}
.modal.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -48%);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
}
.modal-header h3 {
  font-size: 1.05rem;
}
.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  transition: color var(--transition);
}
.modal-close:hover {
  color: var(--text-primary);
}
.modal-body {
  padding: 24px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* --- Page Headers --- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.page-header h2 {
  font-size: 1.5rem;
}
.page-header-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* --- Utility Classes --- */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.text-green { color: var(--dpv-green); }
.text-sm { font-size: 0.82rem; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .editor-layout {
    grid-template-columns: 1fr;
  }
  .editor-toc {
    position: static;
    max-height: none;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    width: 280px;
    min-width: 280px;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
    padding: 20px 16px 60px;
  }
  .editor-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .editor-toolbar-actions {
    width: 100%;
    justify-content: flex-end;
  }
  .upload-zone {
    padding: 40px 20px;
  }
  .export-summary {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- Scrollbar Styles --- */
.sidebar::-webkit-scrollbar,
.editor-toc::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--dpv-dark-lightest);
  border-radius: 4px;
}
.editor-toc::-webkit-scrollbar-thumb {
  background: var(--dpv-grey-medium);
  border-radius: 4px;
}

/* --- Print --- */
@media print {
  .sidebar, .editor-toolbar-actions, .comments-area, .app-footer {
    display: none !important;
  }
  .main-content {
    margin-left: 0;
  }
  .editor-layout {
    grid-template-columns: 1fr;
  }
  .section-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}