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

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --danger: #d93025;
    --danger-light: #fce8e6;
    --success: #188038;
    --success-light: #e6f4ea;
    --warning: #e8710a;
    --warning-light: #fef7e0;
    --bg: #f5f7fa;
    --card: #ffffff;
    --text: #202124;
    --text-secondary: #5f6368;
    --border: #e0e0e0;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

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

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--card);
    border-right: 1px solid var(--border);
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.sidebar-brand {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
}

.sidebar-brand h2 {
    font-size: 1.1rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-nav {
    flex: 1;
    padding: 0 12px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 4px;
    transition: all 0.15s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: var(--primary-light);
    color: var(--primary);
}

.sidebar-nav a .icon { font-size: 1.2rem; }

.sidebar-user {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.85rem;
}

.sidebar-user-info { flex: 1; min-width: 0; }
.sidebar-user-name { font-weight: 600; font-size: 0.85rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user-role { font-size: 0.75rem; color: var(--text-secondary); }

.btn-logout-sidebar {
    background: none; border: none; cursor: pointer;
    font-size: 1.3rem; padding: 4px; opacity: 0.5; transition: opacity 0.2s;
}
.btn-logout-sidebar:hover { opacity: 1; }

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 28px 32px;
    max-width: 1200px;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.page-header h1 { font-size: 1.6rem; font-weight: 700; }

/* ========== Cards ========== */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
}

.card-body { padding: 20px; }

/* ========== Stats Grid ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--border);
    text-align: center;
}

.stat-number { font-size: 2.2rem; font-weight: 800; color: var(--primary); line-height: 1; }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }

/* ========== Forms ========== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; color: var(--text); }

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
    background: var(--card);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    font-family: inherit;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); box-shadow: var(--shadow-lg); }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { opacity: 0.9; }

.btn-outline { background: none; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); border-color: var(--text-secondary); }

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

table th {
    background: var(--bg);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

table tbody tr:hover { background: var(--primary-light); }

/* ========== Badges ========== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-admin { background: #fce8e6; color: var(--danger); }
.badge-manager { background: #fef7e0; color: var(--warning); }
.badge-editor { background: var(--primary-light); color: var(--primary); }
.badge-viewer { background: #f1f3f4; color: var(--text-secondary); }

/* ========== Search bar ========== */
.search-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.search-bar input {
    flex: 1;
    min-width: 200px;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    outline: none;
}

.search-bar input:focus { border-color: var(--primary); }
.search-bar select { padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 0.9rem; }

/* ========== Pagination ========== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border);
    background: var(--card);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.15s;
}

.pagination button:hover:not(:disabled) { background: var(--primary-light); border-color: var(--primary); }
.pagination button.active { background: var(--primary); color: white; border-color: var(--primary); }
.pagination button:disabled { opacity: 0.4; cursor: default; }

/* ========== Modal ========== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.modal h3 { margin-bottom: 16px; }

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}

/* ========== Toast ========== */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    z-index: 200;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ========== File Upload ========== */
.file-upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg);
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.file-upload-area .upload-icon { font-size: 2.5rem; margin-bottom: 8px; }

/* ========== Login Page ========== */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a73e8 0%, #1557b0 100%);
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 16px;
    padding: 40px 32px;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.login-card h1 { text-align: center; margin-bottom: 8px; font-size: 1.4rem; color: var(--primary); }
.login-card .login-sub { text-align: center; color: var(--text-secondary); margin-bottom: 24px; font-size: 0.9rem; }

.login-error { background: var(--danger-light); color: var(--danger); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 0.85rem; display: none; }
.login-error.show { display: block; }

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

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 12px; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .sidebar { width: 200px; }
    .sidebar-brand h2 { font-size: 0.95rem; }
    .sidebar-nav a { padding: 8px 10px; font-size: 0.8rem; }
    .main-content { margin-left: 200px; padding: 20px 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .page-header { flex-direction: column; align-items: flex-start; }
    .stats-grid { grid-template-columns: 1fr; }
}