/* ====================================================================
   SMART SCHOOL MANAGEMENT SYSTEM - COMMERCIAL ADMIN DESIGN SYSTEM
   Theme: Royal Navy & Emerald Accent (Professional Commercial UI/UX)
   Zero CDN Dependencies - 100% Standalone & High Performance
   ==================================================================== */

:root {
    --primary: #1e3a8a;          /* Deep Royal Navy */
    --primary-light: #2563eb;
    --primary-dark: #0f172a;
    --secondary: #0d9488;        /* Emerald / Teal Accent */
    --secondary-hover: #0f766e;
    --bg-main: #f8fafc;          /* Soft Clean Canvas */
    --bg-surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --success: #10b981;
    --success-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --info: #0284c7;
    --info-light: #f0f9ff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;
    --sidebar-width: 260px;
    --header-height: 68px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: #0f172a;
    color: #cbd5e1;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    overflow-y: auto;
    transition: all 0.3s ease;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-brand {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: #090d16;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-brand .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #2563eb, #0d9488);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
}

.sidebar-brand .brand-text {
    font-size: 15px;
    font-weight: 600;
    color: #ffffff;
    line-height: 1.2;
}

.sidebar-brand .brand-sub {
    font-size: 11px;
    color: #94a3b8;
}

.sidebar-menu {
    padding: 16px 12px;
    list-style: none;
    flex: 1;
}

.sidebar-section-title {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #64748b;
    padding: 14px 12px 6px;
}

.sidebar-item {
    margin-bottom: 3px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: #94a3b8;
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.sidebar-link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
}

.sidebar-link.active {
    background: #2563eb;
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.sidebar-link .menu-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

/* Main Area */
.main-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Topbar */
.topbar {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
}

.page-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-profile-badge {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    background: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--primary);
    overflow: hidden;
    border: 2px solid #fff;
    box-shadow: var(--shadow-sm);
}

.user-info .user-name {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-primary);
}

.user-info .user-role {
    font-size: 11px;
    color: var(--text-muted);
}

/* Content Area */
.content-body {
    padding: 28px;
    flex: 1;
}

/* Cards */
.card {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fafcff;
}

.card-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-body {
    padding: 24px;
}

/* Grid System */
.grid {
    display: grid;
    gap: 20px;
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

/* Metric / Stat Card */
.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.primary { background: #eff6ff; color: #2563eb; }
.stat-icon.success { background: #ecfdf5; color: #10b981; }
.stat-icon.warning { background: #fffbeb; color: #f59e0b; }
.stat-icon.info    { background: #f0fdf4; color: #0284c7; }

.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Modern Tables */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th {
    background: #f8fafc;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.table td {
    padding: 14px 16px;
    font-size: 13.5px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.table tr:hover td {
    background: #f8fafc;
}

/* CRUD Action Buttons (Strict Icons: Eye, Pencil, Trash, Shield) */
.action-buttons {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    background: #ffffff;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.15s ease;
}

.btn-icon:hover {
    background: #f1f5f9;
}

.btn-icon.view:hover {
    border-color: #3b82f6;
    color: #2563eb;
    background: #eff6ff;
}

.btn-icon.edit:hover {
    border-color: #f59e0b;
    color: #d97706;
    background: #fffbeb;
}

.btn-icon.delete:hover {
    border-color: #ef4444;
    color: #dc2626;
    background: #fef2f2;
}

.btn-icon.shield:hover {
    border-color: #8b5cf6;
    color: #7c3aed;
    background: #f5f3ff;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 18px;
    font-size: 13.5px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--primary-light);
    color: #ffffff;
}

.btn-primary:hover {
    background: #1d4ed8;
}

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

.btn-success {
    background: var(--success);
    color: #ffffff;
}

.btn-success:hover {
    background: #059669;
}

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

.btn-danger:hover {
    background: #dc2626;
}

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11.5px;
    font-weight: 600;
    line-height: 1;
}

.badge-success { background: var(--success-light); color: #065f46; }
.badge-warning { background: var(--warning-light); color: #92400e; }
.badge-danger  { background: var(--danger-light); color: #991b1b; }
.badge-info    { background: var(--info-light); color: #075985; }
.badge-secondary { background: #f1f5f9; color: #475569; }

/* Forms & Live Search Filter Box */
.filter-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    min-width: 280px;
}

.search-box input {
    width: 100%;
    padding: 9px 14px 9px 36px;
    font-size: 13.5px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s;
    background: #ffffff;
}

.search-box input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 9px 12px;
    font-size: 13.5px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    background: #ffffff;
    transition: all 0.2s;
}

.form-control:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Alert Notification */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13.5px;
}

.alert-success { background: var(--success-light); color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger  { background: var(--danger-light); color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: var(--warning-light); color: #92400e; border: 1px solid #fde68a; }

/* Responsive */
@media (max-width: 992px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-wrapper { margin-left: 0; }
    .menu-toggle { display: block; }
    .grid-cols-4, .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
    .content-body { padding: 16px; }
}