/* ===== Theme Variables ===== */
:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #6366F1;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --info-color: #3B82F6;
    --success-color: #10B981;
    
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    
    --border-color: #E5E7EB;
    --border-radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    
    --sidebar-width: 260px;
}

/* ===== Base Styles ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== App Container ===== */
.app-container { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.app-sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1E293B 0%, #0F172A 100%);
    color: #FFF;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-xl);
}

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

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: #FFF;
}

.brand-logo i {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-section-title {
    padding: 20px 20px 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255,255,255,0.5);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.2s ease;
    position: relative;
}

.nav-item i { width: 20px; text-align: center; font-size: 18px; }
.nav-item span { font-weight: 500; }

.nav-item:hover {
    color: #FFF;
    background: rgba(255,255,255,0.05);
}

.nav-item.active {
    color: #FFF;
    background: rgba(79,70,229,0.15);
    border-left: 3px solid var(--primary-color);
}

.nav-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 16px 20px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: 10px;
    background: rgba(255,255,255,0.05);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.user-info { flex: 1; min-width: 0; }
.user-name { font-weight: 600; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role { font-size: 11px; color: rgba(255,255,255,0.6); }

.user-menu-btn {
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.2s;
}

.user-menu-btn:hover { background: rgba(255,255,255,0.1); color: #FFF; }

/* ===== Dropdown Menu ===== */
.dropdown-item {
    display: block;
    width: 100%;
    padding: 8px 16px;
    clear: both;
    font-weight: 400;
    color: #212529;
    text-align: inherit;
    text-decoration: none;
    white-space: nowrap;
    background-color: transparent;
    border: 0;
    cursor: pointer;
}

.dropdown-item:hover,
.dropdown-item:focus {
    color: #1e2125;
    background-color: #f8f9fa;
}

.dropdown-item.text-danger {
    color: var(--danger-color);
}

.dropdown-item.text-danger:hover,
.dropdown-item.text-danger:focus {
    background-color: rgba(239, 68, 68, 0.1);
}

/* ===== Main Content ===== */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
}

.app-content {
    padding: 32px;
    width: 100%;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.card:hover { box-shadow: var(--shadow-md); }

.card-header {
    padding: 20px 24px;
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body { padding: 24px; }
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.card-subtitle { font-size: 13px; color: var(--text-secondary); }

/* ===== Stat Cards ===== */
.stat-card {
    background: linear-gradient(135deg, var(--bg-primary) 0%, #F9FAFB 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card.stat-primary::before { background: var(--primary-color); }
.stat-card.stat-success::before { background: var(--success-color); }
.stat-card.stat-warning::before { background: var(--warning-color); }
.stat-card.stat-danger::before { background: var(--danger-color); }

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-icon {
    position: absolute;
    right: 20px;
    top: 20px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(79,70,229,0.1);
    color: var(--primary-color);
    font-size: 24px;
}

/* ===== Buttons ===== */
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: #FFF;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success { background: var(--success-color); color: #FFF; }
.btn-danger { background: var(--danger-color); color: #FFF; }
.btn-warning { background: var(--warning-color); color: #FFF; }

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

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: #FFF;
}

/* ===== Tables ===== */
.table {
    width: 100%;
    margin-bottom: 0;
}

.table thead th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 16px;
    border: none;
}

.table tbody td {
    padding: 16px;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover { background: var(--bg-secondary); }

/* ===== Badges ===== */
.badge {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ===== Forms ===== */
.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 13px;
}

.form-control, .form-select {
    padding: 12px 16px;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

/* ===== Toast Notifications ===== */
.toast-notification {
    position: fixed;
    top: 24px;
    right: 24px;
    min-width: 300px;
    z-index: 9999;
    animation: slideIn 0.3s ease;
    box-shadow: var(--shadow-xl);
    border-radius: var(--border-radius);
}

@keyframes slideIn {
    from { transform: translateX(400px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ===== Page Header ===== */
.page-header {
    margin-bottom: 32px;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .app-sidebar { transform: translateX(-100%); }
    .app-main { margin-left: 0; width: 100%; }
    .app-content { padding: 20px; }
}