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

:root {
  --primary: #165BAA;
  --secondary: #0E3A53;
  --bg: #EDEFF3;
  --accent: #1E88E5;
  --success: #43A047;
  --warning: #FB8C00;
  --danger: #E53935;
  --text: #263238;
  --text-light: #78909C;
  --white: #ffffff;
  --border: #D5D9E0;
  --sidebar-w: 260px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

html { font-size: 15px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Layout ===== */
.app-layout { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-w);
  background: var(--secondary);
  color: var(--white);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform 0.3s;
}

.sidebar-brand {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-brand h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.5px;
}

.sidebar-brand span {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  display: block;
  margin-top: 2px;
}

.sidebar-nav { flex: 1; padding: 16px 0; }
.sidebar-nav ul { list-style: none; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  color: rgba(255,255,255,0.7);
  font-size: 0.93rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all 0.2s;
}

.sidebar-nav a:hover {
  color: var(--white);
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}

.sidebar-nav a.active {
  color: var(--white);
  background: rgba(255,255,255,0.08);
  border-left-color: var(--accent);
}

.sidebar-nav .nav-icon { font-size: 1.1rem; width: 24px; text-align: center; }

.sidebar-user {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.85rem;
}

.sidebar-user .user-name { color: var(--white); font-weight: 600; }
.sidebar-user .user-email { color: rgba(255,255,255,0.5); font-size: 0.8rem; }
.sidebar-user a {
  color: rgba(255,255,255,0.5);
  font-size: 0.8rem;
  margin-top: 4px;
  display: inline-block;
}
.sidebar-user a:hover { color: var(--white); }

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

.page-header {
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.page-header h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

/* ===== Cards ===== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* ===== Stats Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
}

.stat-card .stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ===== Tables ===== */
.table-wrapper { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
}

table th, table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table th {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

table td { font-size: 0.93rem; }

table tr:hover { background: rgba(0,0,0,0.015); }

table .badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-admin { background: #E8EAF6; color: var(--primary); }
.badge-member { background: #E0F2F1; color: #00796B; }
.badge-version { background: #E3F2FD; color: var(--accent); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary { background: var(--accent); color: var(--white); }
.btn-primary:hover { background: #1976D2; color: var(--white); }

.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: #C5CAD3; }

.btn-success { background: var(--success); color: var(--white); }
.btn-success:hover { background: #388E3C; color: var(--white); }

.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #C62828; color: var(--white); }

.btn-warning { background: var(--warning); color: var(--white); }

.btn-sm { padding: 5px 12px; font-size: 0.8rem; }

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent);
  color: var(--white);
}

/* ===== Forms ===== */
.form-group { margin-bottom: 18px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.93rem;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30,136,229,0.1);
}

textarea.form-control {
  min-height: 300px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  resize: vertical;
}

select.form-control {
  appearance: auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ===== Alerts ===== */
.alert {
  padding: 12px 18px;
  border-radius: 6px;
  margin-bottom: 18px;
  font-size: 0.9rem;
  font-weight: 500;
}

.alert-danger { background: #FFEBEE; color: var(--danger); border: 1px solid #FFCDD2; }
.alert-success { background: #E8F5E9; color: var(--success); border: 1px solid #C8E6C9; }
.alert-info { background: #E3F2FD; color: var(--accent); border: 1px solid #BBDEFB; }

/* ===== Login Page ===== */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  padding: 20px;
}

.login-box {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 40px;
  width: 100%;
  max-width: 420px;
}

.login-box .login-brand {
  text-align: center;
  margin-bottom: 32px;
}

.login-box .login-brand h1 {
  font-size: 1.8rem;
  color: var(--primary);
  font-weight: 700;
}

.login-box .login-brand p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: 4px;
}

.login-box .btn-primary {
  width: 100%;
  padding: 12px;
  font-size: 1rem;
}

.login-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 0.85rem;
}

/* ===== Document Content ===== */
.doc-content {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  margin-bottom: 20px;
}

.doc-content h1 { font-size: 1.8rem; margin-bottom: 8px; color: var(--text); }
.doc-content h2 { font-size: 1.45rem; margin-top: 28px; margin-bottom: 12px; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.doc-content h3 { font-size: 1.2rem; margin-top: 24px; margin-bottom: 10px; color: var(--text); }
.doc-content p { margin-bottom: 14px; line-height: 1.7; }
.doc-content ul, .doc-content ol { margin-bottom: 14px; padding-left: 24px; }
.doc-content li { margin-bottom: 4px; line-height: 1.6; }
.doc-content code {
  background: #F5F5F5;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88rem;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}
.doc-content pre {
  background: #263238;
  color: #ECEFF1;
  padding: 16px 20px;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 14px;
}
.doc-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.doc-content blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 14px 0;
  background: #F8F9FA;
  border-radius: 0 6px 6px 0;
}
.doc-content table {
  margin-bottom: 14px;
  border: 1px solid var(--border);
}
.doc-content table th { background: #F5F5F5; }

.doc-meta {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

/* ===== Comments ===== */
.comment-section { margin-top: 20px; }

.comment {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.comment:last-child { border-bottom: none; }

.comment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.comment-author { font-weight: 600; font-size: 0.9rem; color: var(--text); }
.comment-date { font-size: 0.8rem; color: var(--text-light); }
.comment-body { font-size: 0.93rem; line-height: 1.5; }

.comment-form { padding: 20px; border-top: 1px solid var(--border); }
.comment-form textarea { min-height: 80px; }
.comment-form .btn { margin-top: 10px; }

/* ===== Version List ===== */
.version-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.version-item:last-child { border-bottom: none; }

.version-info { flex: 1; }
.version-info .version-number { font-weight: 700; color: var(--primary); }
.version-info .version-meta { font-size: 0.82rem; color: var(--text-light); }
.version-info .version-summary { font-size: 0.88rem; color: var(--text); margin-top: 2px; }

.version-actions { display: flex; gap: 6px; flex-shrink: 0; }

/* ===== Diff ===== */
.diff-container { margin-top: 20px; }

.d2h-wrapper {
  border-radius: var(--radius);
  overflow: hidden;
}

/* ===== Grid Layouts ===== */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-3-1 {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
}

/* ===== Editor Layout ===== */
.editor-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.preview-pane {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  min-height: 300px;
  overflow-y: auto;
}

.preview-pane h1 { font-size: 1.4rem; }
.preview-pane h2 { font-size: 1.2rem; }
.preview-pane h3 { font-size: 1.05rem; }

/* ===== Activity List ===== */
.activity-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.activity-item:last-child { border-bottom: none; }
.activity-item .activity-user { font-weight: 600; }
.activity-item .activity-time { color: var(--text-light); font-size: 0.8rem; }

/* ===== Diff Comparison Selector ===== */
.diff-selector {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: #F8F9FA;
  border-radius: 6px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.diff-selector select { width: auto; min-width: 120px; }
.diff-selector .btn { flex-shrink: 0; }

/* ===== Mobile Toggle ===== */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  background: var(--secondary);
  color: var(--white);
  border: none;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 1.2rem;
  cursor: pointer;
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-light);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { color: var(--text); margin-bottom: 8px; }

/* ===== Ideas Board ===== */
.idea-quick-add {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

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

.idea-input {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  resize: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: 60px;
}

.idea-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30,136,229,0.1);
  background: var(--white);
}

.idea-form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.idea-topic-input { flex-shrink: 0; }

/* Filter Bar */
.idea-filters {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  padding: 4px 0;
}

.idea-filter {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-light);
  background: var(--white);
  border: 1.5px solid var(--border);
  transition: all 0.2s;
  text-decoration: none;
}

.idea-filter:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.idea-filter.active {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.idea-filter-topic {
  background: #E3F2FD;
  color: var(--primary);
  border-color: #BBDEFB;
}

.idea-filter-topic.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* Ideas Grid */
.ideas-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.idea-card {
  display: block;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 22px;
  transition: box-shadow 0.2s, transform 0.15s;
  text-decoration: none;
  color: var(--text);
}

.idea-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  text-decoration: none;
}

.idea-card-content {
  font-size: 0.93rem;
  line-height: 1.5;
  margin-bottom: 10px;
  white-space: pre-wrap;
  word-break: break-word;
}

.idea-card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.idea-author { font-weight: 600; }

.idea-topic-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
  background: #E3F2FD;
  color: var(--primary);
}

.idea-comments { font-weight: 500; }

.idea-status-badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
}

.idea-status-promoted { background: #E8F5E9; color: var(--success); }
.idea-status-closed { background: #ECEFF1; color: var(--text-light); }

/* Idea Detail */
.idea-detail-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 32px;
  margin-bottom: 20px;
}

.idea-detail-content {
  font-size: 1.05rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 16px;
}

.idea-detail-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.idea-detail-topic {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.idea-detail-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* File Upload */
.file-upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
  margin-bottom: 12px;
  transition: border-color 0.2s, background 0.2s;
  cursor: pointer;
}

.file-upload-area:hover {
  border-color: var(--accent);
  background: rgba(30,136,229,0.03);
}

.file-upload-area label {
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text-light);
  display: block;
}

.file-upload-area label strong {
  color: var(--accent);
}

.file-upload-area input[type="file"] {
  display: none;
}

.file-upload-name {
  font-size: 0.82rem;
  color: var(--success);
  font-weight: 600;
  margin-top: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-3-1 { grid-template-columns: 1fr; }
  .editor-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .mobile-toggle { display: block; }

  .sidebar {
    transform: translateX(-100%);
  }

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

  .main-content {
    margin-left: 0;
    padding: 20px 16px;
    padding-top: 56px;
  }

  .form-row { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }

  .page-header h2 { font-size: 1.3rem; }
}