@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-main: #f4f7fe;
    --bg-surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    --brand-primary: #3b82f6;
    --brand-primary-hover: #2563eb;
    
    --status-success: #10b981;
    --status-success-bg: #d1fae5;
    --status-pending: #f59e0b;
    --status-pending-bg: #fef3c7;
    --status-danger: #ef4444;
    --status-danger-bg: #fee2e2;
    
    --sidebar-width: 260px;
    --navbar-height: 70px;
}

/* Dark Mode Theme Variables */
html[data-theme="dark"] {
    --bg-main: #0f172a;
    --bg-surface: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    --status-success-bg: rgba(16, 185, 129, 0.2);
    --status-pending-bg: rgba(245, 158, 11, 0.2);
    --status-danger-bg: rgba(239, 68, 68, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}

/* Loading */
.loading {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-surface);
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    z-index: 9999;
}
.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--brand-primary);
    border-radius: 50%;
    width: 40px; height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 36px; height: 36px;
    background: var(--brand-primary);
    color: white;
    border-radius: 8px;
    display: flex; justify-content: center; align-items: center;
    font-weight: 700;
    margin-right: 12px;
}

.logo-text h2 {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.2;
}
.logo-text p {
    font-size: 12px;
    color: var(--text-secondary);
}

.sidebar-nav {
    padding: 24px 16px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: all 0.2s;
}

.nav-item i {
    width: 20px;
    margin-right: 12px;
    font-size: 18px;
}

.nav-item:hover {
    background-color: var(--bg-main);
    color: var(--brand-primary);
}

.nav-item.active {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--brand-primary);
}

.sidebar-footer {
    padding: 24px 16px;
    border-top: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* Top Navbar */
.top-navbar {
    height: var(--navbar-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 90;
}

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

.mobile-menu-btn {
    display: none; /* Hidden on desktop */
}

.page-title {
    font-size: 18px;
    font-weight: 600;
}

.search-bar {
    position: relative;
    width: 400px;
}
.search-bar i {
    position: absolute;
    left: 16px; top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}
.search-bar input {
    width: 100%;
    padding: 10px 16px 10px 40px;
    background-color: var(--bg-main);
    border: 1px solid transparent;
    border-radius: 20px;
    color: var(--text-primary);
    outline: none;
    transition: all 0.2s;
}
.search-bar input:focus {
    background-color: var(--bg-surface);
    border-color: var(--brand-primary);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px; height: 40px;
    border-radius: 50%;
    transition: background 0.2s;
}
.icon-btn:hover {
    background-color: var(--bg-main);
    color: var(--text-primary);
}

.user-avatar img {
    width: 40px; height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

/* Dashboard Content */
.dashboard-content {
    padding: 32px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}

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

/* Registration exports */
.export-section { margin-bottom: 24px; padding: 24px; background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 12px; }
.export-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.export-kicker { display: block; margin-bottom: 8px; color: var(--brand-primary); font-size: 11px; font-weight: 700; letter-spacing: .09em; }
.export-header h3 { margin-bottom: 6px; font-size: 18px; }
.export-header p, .export-note { color: var(--text-secondary); font-size: 13px; line-height: 1.55; }
.export-all-button { flex: 0 0 auto; padding: 9px 12px; border: 1px solid var(--border-color); border-radius: 8px; background: var(--bg-main); color: var(--text-secondary); cursor: pointer; font: inherit; font-size: 13px; font-weight: 600; }
.export-all-button:hover, .export-all-button.active { border-color: var(--brand-primary); background: rgba(59, 130, 246, .1); color: var(--brand-primary); }
.export-category-fieldset { margin: 24px 0 20px; padding: 0; border: 0; }
.export-category-fieldset legend { margin-bottom: 12px; color: var(--text-secondary); font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.export-category-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.export-category-option { display: flex; align-items: center; gap: 12px; min-height: 66px; padding: 12px 14px; border: 1px solid var(--border-color); border-radius: 9px; background: var(--bg-main); cursor: pointer; transition: border-color .2s, background-color .2s, box-shadow .2s; }
.export-category-option:hover, .export-category-option.selected { border-color: var(--brand-primary); background: rgba(59, 130, 246, .08); }
.export-category-option.selected { box-shadow: 0 0 0 1px rgba(59, 130, 246, .16); }
.export-category-option input { width: 18px; height: 18px; accent-color: var(--brand-primary); }
.export-category-option span { display: flex; flex-direction: column; gap: 3px; }
.export-category-option strong { font-size: 14px; }
.export-category-option small { color: var(--text-secondary); font-size: 12px; }
.export-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; border-top: 1px solid var(--border-color); }
.export-match-count { color: var(--text-primary); font-size: 14px; font-weight: 700; }
.export-actions { display: flex; align-items: center; gap: 12px; }
.export-actions .btn { white-space: nowrap; }
.export-actions .btn:disabled { cursor: not-allowed; opacity: .55; }
.export-masteryhub-button { border: 1px solid var(--brand-primary); background: transparent; color: var(--brand-primary); }
.export-note { margin-top: 16px; }

/* Contact messages */
.contact-summary {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    min-width: 205px;
    margin-bottom: 24px;
    padding: 16px 18px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-surface);
}

.contact-summary > i { color: var(--brand-primary); font-size: 24px; }
.contact-summary div { display: flex; flex-direction: column; gap: 3px; }
.contact-summary span { color: var(--text-secondary); font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.contact-summary strong { font-size: 24px; line-height: 1; }
.message-preview { color: var(--text-secondary); font-size: 13px; line-height: 1.45; }
.contact-message-body { padding: 14px; border-radius: 8px; background: var(--bg-main); color: var(--text-primary); font-size: 14px; line-height: 1.65; white-space: normal; word-break: break-word; }

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

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

.btn-secondary {
    background-color: var(--bg-main);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--border-color);
}

/* Stats Row */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--bg-surface);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

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

.stat-value {
    font-size: 28px;
    font-weight: 700;
}

.text-danger { color: var(--status-danger); }
.text-success { color: var(--status-success); }

/* Charts Row */
.charts-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    margin-bottom: 32px;
}

.chart-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.chart-header {
    margin-bottom: 20px;
}
.chart-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.chart-body {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Table Section */
.table-section {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.table-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.table-filters {
    display: flex;
    gap: 12px;
}

.table-filters select {
    padding: 8px 16px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
    outline: none;
}

.table-responsive {
    overflow-x: auto;
}

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

.data-table th,
.data-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background-color: var(--bg-main);
}

.data-table tbody tr:hover {
    background-color: rgba(0,0,0,0.02);
}
html[data-theme="dark"] .data-table tbody tr:hover {
    background-color: rgba(255,255,255,0.02);
}

.team-info {
    display: flex;
    flex-direction: column;
}
.team-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}
.team-leader {
    font-size: 13px;
    color: var(--text-secondary);
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.badge.pending { background-color: var(--status-pending-bg); color: var(--status-pending); }
.badge.approved { background-color: var(--status-success-bg); color: var(--status-success); }
.badge.rejected { background-color: var(--status-danger-bg); color: var(--status-danger); }
.badge.duplicate { background-color: var(--status-danger-bg); color: var(--status-danger); border: 1px solid var(--status-danger); }
.badge.unique { background-color: var(--status-success-bg); color: var(--status-success); }

.text-right { text-align: right; }

.action-menu {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}
.action-btn {
    width: 32px; height: 32px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.action-btn:hover {
    background: var(--bg-main);
    color: var(--text-primary);
}
.action-btn.accept:hover { color: var(--status-success); border-color: var(--status-success); }
.action-btn.reject:hover { color: var(--status-danger); border-color: var(--status-danger); }

/* Modals & Toasts (Preserved from original) */
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); }
.modal-content { background-color: var(--bg-surface); margin: 2% auto; padding: 0; border-radius: 12px; width: 90%; max-width: 800px; max-height: 90vh; overflow-y: auto; border: 1px solid var(--border-color); }
.modal-header { padding: 25px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 25px; }
.modal-footer { padding: 25px; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 15px; }
.close-btn { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text-secondary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; font-size: 14px; }
.form-group input, .form-group textarea { width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 8px; background: var(--bg-main); color: var(--text-primary); }
.form-group input:focus { outline: none; border-color: var(--brand-primary); }
.validation-message { margin-top: 5px; font-size: 12px; padding: 5px; border-radius: 4px; }

#toastContainer { position: fixed; top: 20px; right: 20px; z-index: 1001; }
.toast { background: var(--bg-surface); padding: 15px 20px; margin-bottom: 10px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); border-left: 4px solid var(--brand-primary); display: flex; gap: 10px; align-items: center; border-right: 1px solid var(--border-color); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color);}
.toast.success { border-left-color: var(--status-success); }
.toast.error { border-left-color: var(--status-danger); }

/* Mobile responsiveness */
@media (max-width: 1024px) {
    .charts-row { grid-template-columns: 1fr; }
    
    .sidebar {
        transform: none !important; /* Override slide-in */
        width: 100%;
        height: 70px;
        bottom: 0;
        top: auto;
        flex-direction: row;
        border-right: none;
        border-top: 1px solid var(--border-color);
        box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
        z-index: 999;
    }

    .sidebar-header { display: none; }
    .sidebar-footer { display: none; }

    .sidebar-nav {
        display: flex;
        flex-direction: row;
        justify-content: space-around;
        align-items: center;
        padding: 0;
        width: 100%;
    }

    .nav-item {
        flex-direction: column;
        justify-content: center;
        padding: 8px 4px;
        margin: 0;
        font-size: 11px;
        gap: 4px;
        text-align: center;
        border-radius: 0;
    }

    .nav-item i {
        margin-right: 0;
        font-size: 20px;
        margin-bottom: 2px;
    }
    
    .nav-item.active {
        background-color: transparent;
        border-top: 3px solid var(--brand-primary);
        color: var(--brand-primary);
    }
    .nav-item:hover {
        background-color: transparent;
    }

    .main-content {
        margin-left: 0;
        margin-bottom: 70px; /* Space for bottom nav */
    }
    
    .mobile-menu-btn {
        display: none !important; /* Hide hamburger */
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
}

@media (max-width: 768px) {
    .stats-row { grid-template-columns: 1fr 1fr; }
    
    .top-navbar {
        padding: 0 16px;
    }
    
    .dashboard-content {
        padding: 16px;
    }
    
    .details-panel {
        width: 100%;
        right: -100%;
    }
    
    .search-bar {
        width: 200px;
    }
    
    .table-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .table-filters {
        width: 100%;
        flex-direction: column;
    }
    
    .table-filters select {
        width: 100%;
    }
}

/* Applications become cards before a narrow tablet can force horizontal scrolling. */
@media (max-width: 900px) {
    .table-section {
        overflow: visible;
    }

    .table-responsive {
        overflow: visible;
    }

    .data-table,
    .data-table tbody,
    .data-table tr,
    .data-table td {
        display: block;
        width: 100%;
    }

    .data-table thead {
        display: none;
    }

    .data-table tbody {
        padding: 12px;
    }

    .data-table tbody tr {
        margin-bottom: 12px;
        padding: 4px 16px;
        border: 1px solid var(--border-color);
        border-radius: 10px;
        background: var(--bg-surface);
    }

    .data-table td {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 16px;
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
        text-align: right;
    }

    .data-table td:last-child {
        border-bottom: 0;
    }

    .data-table td::before {
        content: attr(data-label);
        flex: 0 0 96px;
        color: var(--text-secondary);
        font-size: 11px;
        font-weight: 700;
        letter-spacing: .06em;
        text-align: left;
        text-transform: uppercase;
    }

    .data-table td:first-child .team-info {
        align-items: flex-end;
        text-align: right;
    }

    .data-table td[data-label="Status"] > div,
    .data-table td[data-label="Actions"] .action-menu {
        justify-content: flex-end;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr; }
    .search-bar { width: 140px; }
    .page-title { display: none; }
    .dashboard-content { padding: 12px; }
    .table-header { padding: 16px; }
    .data-table tbody { padding: 8px; }
    .data-table tbody tr { padding: 4px 12px; }
    .data-table td { gap: 10px; }
    .data-table td::before { flex-basis: 78px; }
}

/* Slide-over Details Panel */
.panel-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.panel-overlay.active {
    opacity: 1;
    visibility: visible;
}
.details-panel {
    position: fixed;
    top: 0; right: -400px;
    width: 400px; max-width: 100%;
    height: 100vh;
    background: var(--bg-surface);
    box-shadow: -4px 0 24px rgba(0,0,0,0.1);
    z-index: 1050;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}
.details-panel.active {
    right: 0;
}
.panel-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.panel-header h3 {
    font-size: 18px;
    font-weight: 600;
}
.panel-body {
    padding: 24px;
    flex: 1;
    overflow-y: auto;
}
.detail-section {
    margin-bottom: 24px;
}
.detail-section h4 {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}
.detail-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
}
.detail-item i {
    color: var(--text-secondary);
    margin-right: 12px;
    margin-top: 4px;
    width: 16px;
    text-align: center;
}
.detail-item-content {
    flex: 1;
}
.detail-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 2px;
}
.detail-value {
    font-size: 14px;
    color: var(--text-primary);
    word-break: break-all;
}
.member-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-main);
    border-radius: 4px;
    font-size: 13px;
    margin: 0 8px 8px 0;
    border: 1px solid var(--border-color);
}
.clickable-row {
    cursor: pointer;
}

@media (max-width: 768px) {
    .export-header, .export-footer { flex-direction: column; align-items: stretch; }
    .export-all-button { align-self: flex-start; }
    .export-actions { width: 100%; flex-direction: column; }
    .export-actions .btn { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
    .export-section { padding: 18px; }
    .export-category-grid { grid-template-columns: 1fr; }
    .export-all-button { width: 100%; }
    .contact-summary { width: 100%; }
}

.logout-button {
    width: 100%;
    border: 0;
    background: transparent;
    cursor: pointer;
    text-align: left;
    font: inherit;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: var(--bg-main);
}

.login-card {
    width: min(100%, 420px);
    padding: 36px;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    background: var(--bg-surface);
    box-shadow: 0 20px 45px rgba(0, 0, 0, .12);
}

.login-kicker {
    margin: 18px 0 6px;
    color: var(--brand-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .12em;
}

.login-card h1 { margin: 0; }
.login-copy { color: var(--text-secondary); margin-bottom: 28px; }
.login-card label { display: block; margin: 16px 0 7px; font-weight: 600; }
.login-card input { width: 100%; }
.login-card .btn { width: 100%; margin-top: 24px; justify-content: center; }
.login-error { color: #dc2626; margin: 14px 0 0; }