/**
 * PixelPath Education - Main Stylesheet
 * Modern dark/light theme with responsive design
 */

:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --dark: #1e293b;
    --light: #f8fafc;
    --body-bg: #f1f5f9;
    --card-bg: #ffffff;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --header-height: 60px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 10px;
    --radius-sm: 6px;
    --radius-lg: 16px;
}

[data-theme="dark"] {
    --body-bg: #0f172a;
    --card-bg: #1e293b;
    --text-dark: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --dark: #0f172a;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--body-bg);
    color: var(--text-dark);
    line-height: 1.6;
    font-size: 14px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: all 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

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

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

.login-logo {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo i {
    font-size: 48px;
    color: var(--primary);
}

.login-logo h3 {
    margin-top: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 14px;
}

.form-floating > label {
    color: var(--text-muted);
}

.form-control {
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    font-size: 14px;
    transition: all 0.2s;
    background: var(--card-bg);
    color: var(--text-dark);
}

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

.btn {
    border-radius: var(--radius);
    padding: 10px 20px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
    border: none;
}

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

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

.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-info { background: var(--info); color: white; }
.btn-secondary { background: var(--secondary); color: white; }

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

.btn-lg {
    padding: 14px 24px;
    font-size: 16px;
}

/* ===== LAYOUT ===== */
.wrapper {
    display: flex;
    min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: all 0.3s;
    overflow-y: auto;
    overflow-x: hidden;
}

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

.sidebar-brand h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
}

.sidebar-brand i {
    font-size: 24px;
}

.sidebar-nav {
    list-style: none;
    padding: 10px 0;
}

.sidebar-item {
    margin: 2px 10px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    border-radius: var(--radius);
    transition: all 0.2s;
    font-size: 14px;
}

.sidebar-link:hover {
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary);
}

.sidebar-item.active .sidebar-link {
    background: var(--primary);
    color: white;
}

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

.sidebar-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1001;
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px;
    border-radius: var(--radius);
    cursor: pointer;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 20px;
    min-height: 100vh;
}

/* ===== TOP HEADER ===== */
.top-header {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.header-search {
    position: relative;
    width: 300px;
}

.header-search input {
    width: 100%;
    padding: 8px 16px 8px 36px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    background: var(--body-bg);
    color: var(--text-dark);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-btn {
    position: relative;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.header-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.header-btn .badge {
    position: absolute;
    top: -5px;
    right: -5px;
    font-size: 10px;
    padding: 2px 5px;
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: var(--radius);
    transition: all 0.2s;
}

.user-dropdown:hover {
    background: var(--body-bg);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-light);
}

.user-info {
    line-height: 1.2;
}

.user-name {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-dark);
}

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

/* ===== STATS CARDS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

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

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

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

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.stat-title {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-icon.primary { background: rgba(79, 70, 229, 0.1); color: var(--primary); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.stat-icon.info { background: rgba(59, 130, 246, 0.1); color: var(--info); }

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.stat-change {
    font-size: 12px;
    color: var(--success);
}

.stat-change.negative {
    color: var(--danger);
}

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

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    background: rgba(0,0,0,0.02);
}

/* ===== TABLES ===== */
.table-responsive {
    overflow-x: auto;
}

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

.table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
    background: rgba(0,0,0,0.02);
}

.table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-dark);
    vertical-align: middle;
}

.table tbody tr:hover {
    background: rgba(79, 70, 229, 0.02);
}

.table .actions {
    display: flex;
    gap: 5px;
}

.table .actions .btn {
    padding: 4px 8px;
    font-size: 12px;
}

/* ===== BADGES ===== */
.badge {
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
}

.bg-success { background: rgba(16, 185, 129, 0.15) !important; color: #059669 !important; }
.bg-danger { background: rgba(239, 68, 68, 0.15) !important; color: #dc2626 !important; }
.bg-warning { background: rgba(245, 158, 11, 0.15) !important; color: #d97706 !important; }
.bg-info { background: rgba(59, 130, 246, 0.15) !important; color: #2563eb !important; }
.bg-primary { background: rgba(79, 70, 229, 0.15) !important; color: #4f46e5 !important; }
.bg-secondary { background: rgba(100, 116, 139, 0.15) !important; color: #475569 !important; }
.bg-dark { background: rgba(30, 41, 59, 0.15) !important; color: #0f172a !important; }

/* ===== ALERTS ===== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    border: none;
    margin-bottom: 16px;
    font-size: 13px;
}

.alert-success { background: rgba(16, 185, 129, 0.1); color: #059669; border-left: 4px solid var(--success); }
.alert-danger { background: rgba(239, 68, 68, 0.1); color: #dc2626; border-left: 4px solid var(--danger); }
.alert-warning { background: rgba(245, 158, 11, 0.1); color: #d97706; border-left: 4px solid var(--warning); }
.alert-info { background: rgba(59, 130, 246, 0.1); color: #2563eb; border-left: 4px solid var(--info); }

/* ===== FORMS ===== */
.form-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.form-select {
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    font-size: 14px;
    background: var(--card-bg);
    color: var(--text-dark);
}

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

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.input-group {
    display: flex;
}

.input-group .form-control {
    border-radius: var(--radius) 0 0 var(--radius);
}

.input-group .btn {
    border-radius: 0 var(--radius) var(--radius) 0;
}

/* ===== MODAL ===== */
.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    border-top: 1px solid var(--border);
    padding: 12px 20px;
}

/* ===== PAGINATION ===== */
.pagination {
    display: flex;
    gap: 5px;
    list-style: none;
    padding: 0;
}

.page-link {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-dark);
    background: var(--card-bg);
    font-size: 13px;
}

.page-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.page-item.active .page-link {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== PAGE HEADER ===== */
.page-header {
    margin-bottom: 24px;
}

.page-title h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
}

.breadcrumb {
    display: flex;
    gap: 8px;
    list-style: none;
    padding: 0;
    margin-top: 8px;
    font-size: 13px;
}

.breadcrumb-item a {
    color: var(--primary);
}

.breadcrumb-item.active {
    color: var(--text-muted);
}

/* ===== DROPDOWN ===== */
.dropdown-menu {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    min-width: 200px;
}

.dropdown-item {
    padding: 8px 16px;
    font-size: 13px;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.dropdown-item:hover {
    background: rgba(79, 70, 229, 0.05);
    color: var(--primary);
}

.dropdown-divider {
    border-top: 1px solid var(--border);
    margin: 8px 0;
}

/* ===== TABS ===== */
.nav-tabs {
    border-bottom: 1px solid var(--border);
    gap: 5px;
}

.nav-tabs .nav-link {
    padding: 10px 18px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
    border-radius: 0;
}

.nav-tabs .nav-link:hover {
    color: var(--primary);
    border-color: transparent;
}

.nav-tabs .nav-link.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: transparent;
}

/* ===== PROGRESS ===== */
.progress {
    height: 8px;
    background: var(--body-bg);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.3s;
}

/* ===== TIMELINE ===== */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 20px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    border: 2px solid var(--card-bg);
}

.timeline-content {
    background: var(--body-bg);
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 13px;
}

/* ===== CHART CONTAINER ===== */
.chart-container {
    position: relative;
    height: 300px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .sidebar-toggle {
        display: block;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .login-box {
        padding: 30px 20px;
    }
    .top-header {
        flex-direction: column;
        gap: 10px;
    }
    .header-search {
        width: 100%;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--body-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== PRINT ===== */
@media print {
    .sidebar, .top-header, .sidebar-toggle {
        display: none !important;
    }
    .main-content {
        margin-left: 0 !important;
    }
}

/* ===== UTILITIES ===== */
.text-primary { color: var(--primary) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }
.text-muted { color: var(--text-muted) !important; }

.fw-bold { font-weight: 700 !important; }
.fw-semibold { font-weight: 600 !important; }

.fs-12 { font-size: 12px !important; }
.fs-13 { font-size: 13px !important; }
.fs-14 { font-size: 14px !important; }
.fs-16 { font-size: 16px !important; }
.fs-18 { font-size: 18px !important; }
.fs-20 { font-size: 20px !important; }
.fs-24 { font-size: 24px !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 4px !important; }
.mb-2 { margin-bottom: 8px !important; }
.mb-3 { margin-bottom: 12px !important; }
.mb-4 { margin-bottom: 16px !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 4px !important; }
.mt-2 { margin-top: 8px !important; }
.mt-3 { margin-top: 12px !important; }
.mt-4 { margin-top: 16px !important; }

.me-1 { margin-right: 4px !important; }
.me-2 { margin-right: 8px !important; }

.ms-1 { margin-left: 4px !important; }
.ms-2 { margin-left: 8px !important; }

.p-0 { padding: 0 !important; }
.p-3 { padding: 12px !important; }

.d-flex { display: flex !important; }
.align-items-center { align-items: center !important; }
.justify-content-between { justify-content: space-between !important; }
.gap-2 { gap: 8px !important; }
.gap-3 { gap: 12px !important; }

.w-100 { width: 100% !important; }