/* ===================== CSS Variables / Theming ===================== */
:root,
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f6f3;
    --bg-tertiary: #f0efeb;
    --bg-hover: rgba(55, 53, 47, 0.08);
    --bg-active: rgba(55, 53, 47, 0.12);
    --text-primary: #37352f;
    --text-secondary: #787774;
    --text-tertiary: #b4b4b0;
    --border-color: #e3e2de;
    --accent-color: #2383e2;
    --accent-hover: #1a73d4;
    --danger-color: #eb5757;
    --success-color: #4dab5c;
    --warning-color: #f0b449;
    --shadow-sm: 0 1px 2px 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);
    --sidebar-width: 260px;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: 'SFMono-Regular', Menlo, Consolas, monospace;
}

[data-theme="dark"] {
    --bg-primary: #191919;
    --bg-secondary: #202020;
    --bg-tertiary: #2f2f2f;
    --bg-hover: rgba(255, 255, 255, 0.08);
    --bg-active: rgba(255, 255, 255, 0.12);
    --text-primary: #e3e2de;
    --text-secondary: #9b9a97;
    --text-tertiary: #5a5a58;
    --border-color: #373737;
    --accent-color: #529cca;
    --accent-hover: #6aafda;
    --danger-color: #eb5757;
    --success-color: #4dab5c;
    --warning-color: #f0b449;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

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

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

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

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

.main-content {
    flex: 1;
    min-width: 0;
    margin-left: var(--sidebar-width);
    padding: 0;
    transition: margin-left 0.2s;
}

.sidebar-collapsed .main-content { margin-left: 0; }

/* ===================== Sidebar ===================== */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0; top: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.2s;
    overflow: hidden;
}

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

.sidebar-expand-btn {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 101;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 4px;
    color: var(--text-secondary);
    display: none;
    transition: opacity 0.2s;
}
.sidebar-expand-btn:hover { background: var(--bg-hover); }
.sidebar-collapsed .sidebar-expand-btn { display: block; }

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; }
.logo-icon { font-size: 20px; }

.sidebar-toggle {
    background: none; border: none; cursor: pointer; padding: 4px;
    color: var(--text-secondary); border-radius: var(--radius-sm);
}
.sidebar-toggle:hover { background: var(--bg-hover); }

.sidebar-notifications {
    display: flex; align-items: center; gap: 8px;
    margin: 4px 10px 0; padding: 6px 10px;
    border-radius: var(--radius-md); cursor: pointer;
    color: var(--text-secondary); font-size: 13px;
    text-decoration: none; position: relative;
    transition: background 0.1s;
}
.sidebar-notifications:hover { background: var(--bg-hover); color: var(--text-primary); }

.notification-badge {
    background: var(--danger-color); color: #fff;
    font-size: 11px; font-weight: 600; min-width: 18px; height: 18px;
    border-radius: 9px; display: inline-flex; align-items: center;
    justify-content: center; padding: 0 5px; margin-left: auto;
}

.sidebar-search {
    display: flex; align-items: center; gap: 8px;
    margin: 8px 10px; padding: 6px 10px;
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); cursor: pointer;
    color: var(--text-secondary); font-size: 13px;
}
.sidebar-search:hover { background: var(--bg-hover); }
.sidebar-search kbd {
    margin-left: auto; font-size: 11px; padding: 1px 5px;
    background: var(--bg-tertiary); border-radius: 3px;
    font-family: var(--font-sans);
}

.sidebar-sections {
    flex: 1; overflow-y: auto; padding: 4px 0;
}

.section-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 14px 4px; font-size: 12px; font-weight: 600;
    color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.05em;
}

.sidebar-item {
    display: flex; align-items: center; gap: 6px;
    padding: 4px 14px; font-size: 14px; color: var(--text-primary);
    text-decoration: none; border-radius: 0; cursor: pointer;
    transition: background 0.1s;
}
.sidebar-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-item.active { background: var(--bg-active); font-weight: 500; }

.item-icon { flex-shrink: 0; font-size: 16px; width: 20px; text-align: center; }
.item-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.tree-item { position: relative; }
.tree-toggle {
    background: none; border: none; padding: 2px; cursor: pointer;
    color: var(--text-tertiary); border-radius: 2px; flex-shrink: 0;
    transition: transform 0.15s;
}
.tree-toggle:hover { background: var(--bg-hover); }
.tree-toggle.expanded { transform: rotate(90deg); }
.tree-children { padding-left: 16px; }

.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding: 4px 0 8px;
}

.sidebar-user {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 14px; font-size: 13px; color: var(--text-secondary);
}
.user-actions { display: flex; gap: 4px; }

.inline-form { display: inline; }

/* ===================== Buttons ===================== */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px; font-size: 14px; font-family: var(--font-sans);
    border: none; border-radius: var(--radius-md); cursor: pointer;
    transition: background 0.15s, color 0.15s; text-decoration: none;
    white-space: nowrap;
}

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

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

.btn-sm { padding: 3px 8px; font-size: 13px; }
.btn-block { width: 100%; justify-content: center; }

.btn-icon {
    background: none; border: none; cursor: pointer; padding: 4px;
    color: var(--text-secondary); border-radius: var(--radius-sm);
    font-size: 14px; text-decoration: none; display: inline-flex;
    align-items: center; justify-content: center;
}
.btn-icon:hover { background: var(--bg-hover); }

/* ===================== Forms ===================== */
.form-control {
    width: 100%; padding: 8px 12px; font-size: 14px;
    font-family: var(--font-sans);
    background: var(--bg-primary); color: var(--text-primary);
    border: 1px solid var(--border-color); border-radius: var(--radius-md);
    transition: border-color 0.15s;
}
.form-control:focus {
    outline: none; border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(35, 131, 226, 0.2);
}

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.form-error { display: block; font-size: 12px; color: var(--danger-color); margin-top: 4px; }

.form-check { display: flex; align-items: center; gap: 8px; }
.form-check-input { width: 16px; height: 16px; }
.form-check-label { font-size: 14px; }

.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

.form-actions { display: flex; gap: 8px; margin-top: 24px; }

/* ===================== Flash Messages ===================== */
.flash-messages { padding: 0 24px; padding-top: 16px; }
.flash {
    padding: 10px 16px; border-radius: var(--radius-md);
    font-size: 14px; margin-bottom: 8px; position: relative;
    display: flex; align-items: center; justify-content: space-between;
}
.flash-success { background: #e6f4ea; color: #1e7e34; }
.flash-danger { background: #fde8e8; color: #c53030; }
.flash-warning { background: #fff3cd; color: #856404; }
.flash-info { background: #e8f4fd; color: #1a56db; }
.flash-close { background: none; border: none; cursor: pointer; font-size: 18px; padding: 0 4px; }

[data-theme="dark"] .flash-success { background: #1a332a; color: #68d391; }
[data-theme="dark"] .flash-danger { background: #331a1a; color: #fc8181; }
[data-theme="dark"] .flash-warning { background: #332b1a; color: #f6ad55; }
[data-theme="dark"] .flash-info { background: #1a2633; color: #63b3ed; }

/* ===================== Auth ===================== */
.auth-layout {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh; background: var(--bg-secondary);
}

.auth-container { width: 100%; max-width: 400px; padding: 20px; }

.auth-card {
    background: var(--bg-primary); padding: 40px;
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
}

.auth-logo { text-align: center; margin-bottom: 32px; }
.auth-logo h1 { font-size: 22px; font-weight: 600; margin-top: 8px; }
.logo-icon-lg { font-size: 48px; }

.auth-form .btn { margin-top: 8px; padding: 10px; font-size: 15px; }

/* ===================== Dashboard ===================== */
.dashboard { max-width: 900px; margin: 0 auto; padding: 40px 24px; }
.dashboard-header h1 { font-size: 28px; font-weight: 700; margin-bottom: 32px; }

.dashboard-section { margin-bottom: 40px; }
.dashboard-section h2 { font-size: 16px; font-weight: 600; color: var(--text-secondary); margin-bottom: 16px; }

.section-header-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }

.page-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.page-card {
    display: block; padding: 16px; background: var(--bg-secondary);
    border-radius: var(--radius-md); border: 1px solid var(--border-color);
    transition: box-shadow 0.15s; color: var(--text-primary); text-decoration: none;
}
.page-card:hover { box-shadow: var(--shadow-md); color: var(--text-primary); }
.page-card-icon { font-size: 28px; margin-bottom: 8px; }
.page-card-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.page-card-preview { font-size: 12px; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.page-list-item {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 12px; border-radius: var(--radius-sm);
    color: var(--text-primary); text-decoration: none;
    transition: background 0.1s;
}
.page-list-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.page-list-item .page-icon { font-size: 18px; flex-shrink: 0; }
.page-list-item .page-title { flex: 1; font-size: 14px; }
.page-list-item .page-date { font-size: 12px; color: var(--text-tertiary); }
.page-list-item .page-author { font-size: 12px; color: var(--text-secondary); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); }
.empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h3 { font-size: 18px; margin-bottom: 8px; color: var(--text-primary); }
.empty-state .btn { margin-top: 16px; }

/* ===================== Page View ===================== */
.page-view { max-width: 900px; margin: 0 auto; padding: 0 24px 60px; }
.page-view.full-width { max-width: 100%; padding: 0 60px 60px; }

.page-cover {
    height: 200px; background-size: cover; position: relative;
    margin: 0 -24px; border-radius: 0;
}
.page-view.full-width .page-cover { margin: 0 -60px; }
.cover-actions {
    position: absolute; bottom: 8px; right: 8px; display: flex; gap: 4px;
    opacity: 0; transition: opacity 0.2s;
}
.page-cover:hover .cover-actions { opacity: 1; }

.page-title-area { display: flex; align-items: flex-start; gap: 8px; padding: 32px 0 4px; }

.page-icon-btn {
    background: none; border: none; font-size: 40px; cursor: pointer;
    padding: 0; line-height: 1; border-radius: var(--radius-sm);
}
.page-icon-btn:hover { background: var(--bg-hover); }

.page-title-input {
    flex: 1; background: none; border: none; font-size: 32px;
    font-weight: 700; color: var(--text-primary); outline: none;
    font-family: var(--font-sans); padding: 0; line-height: 1.3;
}
.page-title-input::placeholder { color: var(--text-tertiary); }

.page-actions {
    display: flex; align-items: center; gap: 4px;
    padding: 8px 0; border-bottom: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.page-body { padding-top: 8px; }

.child-pages { margin-top: 24px; border-top: 1px solid var(--border-color); padding-top: 16px; }
.child-page-item {
    display: flex; align-items: center; gap: 8px; padding: 6px 8px;
    border-radius: var(--radius-sm); color: var(--text-primary); text-decoration: none;
}
.child-page-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.child-icon { font-size: 16px; }
.child-title { font-size: 14px; }

.add-subpage { margin-top: 8px; }

/* ===================== Breadcrumb ===================== */
.breadcrumb {
    display: flex; align-items: center; gap: 4px;
    padding: 12px 0; font-size: 13px; color: var(--text-secondary);
}
.breadcrumb-item { color: var(--text-secondary); text-decoration: none; padding: 2px 4px; border-radius: 3px; }
.breadcrumb-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.breadcrumb-item.current { color: var(--text-primary); font-weight: 500; }
.breadcrumb-sep { color: var(--text-tertiary); }
.breadcrumb-icon { margin-right: 2px; }

/* ===================== Dropdown ===================== */
.dropdown { position: relative; }
.dropdown-menu {
    position: absolute; right: 0; top: 100%;
    background: var(--bg-primary); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); box-shadow: var(--shadow-md);
    min-width: 200px; z-index: 50; padding: 4px;
}
.dropdown-item {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 12px; font-size: 14px; color: var(--text-primary);
    background: none; border: none; width: 100%; text-align: left;
    cursor: pointer; border-radius: var(--radius-sm);
    font-family: var(--font-sans);
}
.dropdown-item:hover { background: var(--bg-hover); }
.dropdown-item.danger { color: var(--danger-color); }
.dropdown-menu hr { border: none; border-top: 1px solid var(--border-color); margin: 4px 0; }

/* ===================== Search Modal ===================== */
.search-modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: flex-start; justify-content: center; padding-top: 15vh; }
.search-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.4); }
.search-dialog {
    position: relative; width: 560px; max-width: 90vw; background: var(--bg-primary);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); overflow: hidden;
}
.search-input-wrapper {
    display: flex; align-items: center; gap: 10px; padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}
.search-input-wrapper svg { color: var(--text-tertiary); flex-shrink: 0; }
#searchInput {
    flex: 1; background: none; border: none; font-size: 16px;
    color: var(--text-primary); outline: none; font-family: var(--font-sans);
}
.search-results { max-height: 400px; overflow-y: auto; padding: 4px; }
.search-result-item {
    display: flex; align-items: center; gap: 10px; padding: 8px 12px;
    border-radius: var(--radius-sm); cursor: pointer; color: var(--text-primary);
    text-decoration: none;
}
.search-result-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.search-result-title { font-size: 14px; font-weight: 500; }
.search-result-preview { font-size: 12px; color: var(--text-secondary); }

/* ===================== Comments Panel ===================== */
.comments-panel {
    position: fixed; right: 0; top: 0; width: 340px; height: 100vh;
    background: var(--bg-primary); border-left: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg); z-index: 150; display: flex; flex-direction: column;
}
.comments-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px; border-bottom: 1px solid var(--border-color);
}
.comments-header h3 { font-size: 16px; font-weight: 600; }
.comments-list { flex: 1; overflow-y: auto; padding: 12px; }
.comments-input { padding: 12px; border-top: 1px solid var(--border-color); }
.comments-input textarea {
    width: 100%; resize: none; font-family: var(--font-sans);
    font-size: 14px; padding: 8px; border: 1px solid var(--border-color);
    border-radius: var(--radius-md); background: var(--bg-primary);
    color: var(--text-primary);
}
.comments-input .btn { margin-top: 8px; }

.comment-item { padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.comment-author { font-size: 13px; font-weight: 600; }
.comment-text { font-size: 14px; margin-top: 4px; }
.comment-time { font-size: 11px; color: var(--text-tertiary); margin-top: 2px; }

/* ===================== Share Dialog ===================== */
.share-dialog { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; }
.share-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.4); }
.share-card {
    position: relative; width: 480px; max-width: 90vw; background: var(--bg-primary);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 24px;
}
.share-card h3 { font-size: 18px; margin-bottom: 16px; }
.share-input-row { display: flex; gap: 8px; margin-bottom: 16px; }
.share-input-row .form-control { flex: 1; }
.share-input-row select { width: auto; }

/* ===================== Presence ===================== */
.presence-bar {
    position: fixed; top: 12px; right: 12px; display: flex; gap: -8px; z-index: 50;
}
.presence-avatar {
    width: 28px; height: 28px; border-radius: 50%;
    background: var(--accent-color); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; font-weight: 600; border: 2px solid var(--bg-primary);
    margin-left: -6px;
}

/* ===================== Admin ===================== */
.admin-view { max-width: 1000px; margin: 0 auto; padding: 40px 24px; }
.admin-view h1 { font-size: 24px; font-weight: 700; margin-bottom: 24px; }
.admin-view h2 { font-size: 18px; font-weight: 600; margin: 24px 0 16px; }

.admin-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.admin-header h1 { margin-bottom: 0; }

.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px; margin-bottom: 32px;
}
.stat-card {
    background: var(--bg-secondary); padding: 20px;
    border-radius: var(--radius-md); border: 1px solid var(--border-color);
}
.stat-value { font-size: 32px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

.admin-nav { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.admin-nav-item {
    padding: 10px 16px; background: var(--bg-secondary);
    border: 1px solid var(--border-color); border-radius: var(--radius-md);
    color: var(--text-primary); text-decoration: none; font-size: 14px;
}
.admin-nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }

.admin-form { max-width: 600px; }

.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
    text-align: left; padding: 10px 12px; font-weight: 600;
    border-bottom: 2px solid var(--border-color); font-size: 13px;
    color: var(--text-secondary);
}
.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--border-color); }
.data-table td.actions { white-space: nowrap; }

.activity-list { display: flex; flex-direction: column; gap: 4px; }
.activity-item {
    display: flex; align-items: center; gap: 12px;
    padding: 8px 12px; font-size: 13px; border-radius: var(--radius-sm);
    background: var(--bg-secondary);
}
.activity-user { font-weight: 600; min-width: 120px; }
.activity-action { color: var(--text-secondary); }
.activity-entity { color: var(--text-secondary); font-family: var(--font-mono); font-size: 12px; }
.activity-ip { color: var(--text-tertiary); font-family: var(--font-mono); font-size: 12px; }
.activity-time { margin-left: auto; color: var(--text-tertiary); font-size: 12px; }

.ai-configs { display: flex; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.config-card {
    padding: 16px; background: var(--bg-secondary);
    border: 1px solid var(--border-color); border-radius: var(--radius-md);
    min-width: 200px;
}
.config-provider { font-weight: 700; font-size: 16px; margin-bottom: 4px; }
.config-model { font-size: 14px; color: var(--text-secondary); }
.config-status { font-size: 13px; margin-top: 8px; }
.config-params { font-size: 12px; color: var(--text-tertiary); margin-top: 4px; }

.filter-bar { margin-bottom: 20px; display: flex; align-items: center; gap: 8px; font-size: 14px; }

.pagination { display: flex; align-items: center; gap: 12px; margin-top: 24px; justify-content: center; }
.page-info { font-size: 13px; color: var(--text-secondary); }

/* ===================== Trash ===================== */
.trash-view { max-width: 800px; margin: 0 auto; padding: 40px 24px; }
.trash-view h1 { font-size: 24px; margin-bottom: 24px; }
.trash-item { justify-content: flex-start; }
.trash-actions { margin-left: auto; }

/* ===================== Error Page ===================== */
.error-page { text-align: center; padding: 80px 20px; }
.error-page h1 { font-size: 72px; font-weight: 700; color: var(--text-tertiary); }
.error-page p { font-size: 16px; color: var(--text-secondary); margin: 16px 0 24px; }

/* ===================== Responsive ===================== */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.mobile-open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .page-view { padding: 0 16px 40px; }
    .page-view.full-width { padding: 0 16px 40px; }
    .page-title-input { font-size: 24px; }
    .page-icon-btn { font-size: 32px; }
    .dashboard { padding: 24px 16px; }
    .page-grid { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .form-row { flex-direction: column; gap: 0; }
    .comments-panel { width: 100%; }
}