:root {
    --primary: #0e3635; /* Custom Dark Teal/Green */
    --primary-hover: #164f4e;
    --primary-light: rgba(14, 54, 53, 0.15);
    --primary-glow: rgba(14, 54, 53, 0.4);
    
    --success: #008A4B; /* Aramco Green */
    --success-hover: #006D3B;
    --danger: #D32F2F;
    --danger-hover: #B71C1C;
    --warning: #F57C00;
    
    --bg: #0b1218; /* Custom Dark Background */
    --surface: #13222b; /* Custom Surface Card Color */
    --surface-hover: #1c313d;
    --border: #22414a; /* Custom Border Color */
    --border-active: #0e3635;
    
    --text: #FFFFFF;
    --text-muted: #c8d2d8; /* Custom Light Text */
    --text-dark: #0b1218;
    
    --font: 'Inter', system-ui, -apple-system, sans-serif;
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container-fluid {
    width: 95%;
    max-width: 1400px;
    margin: 40px auto;
}

main {
    flex: 1;
}

/* Header & Footer styling */
.header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    background: rgba(19, 34, 43, 0.5);
    backdrop-filter: blur(10px);
}

.footer {
    padding: 25px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    border-top: 1px solid var(--border);
    margin-top: 50px;
}

/* Premium Card Layout */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    margin-bottom: 30px;
    transition: var(--transition);
}

/* Utility styles */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mt-4 { margin-top: 40px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.btn-block { display: block; width: 100%; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.05);
}
.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: 0 0 15px var(--primary-glow);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
}

.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-success:hover:not(:disabled) {
    background: var(--success-hover);
    box-shadow: 0 0 15px rgba(0, 138, 75, 0.4);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover);
    box-shadow: 0 0 15px rgba(211, 47, 47, 0.4);
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}
.btn-warning:hover:not(:disabled) {
    box-shadow: 0 0 15px rgba(245, 124, 0, 0.4);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: 8px;
}

/* Logo styling */
.logo {
    max-width: 200px;
    display: block;
    filter: drop-shadow(0 2px 8px rgba(14, 54, 53, 0.4));
}

h1 {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 500;
    opacity: 0.9;
}

/* Input Fields styling */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

input[type="email"],
input[type="text"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    background: rgba(11, 18, 24, 0.6);
    color: #fff;
    border-radius: var(--radius);
    outline: none;
    font-size: 15px;
    transition: var(--transition);
}

input[type="email"]:focus,
input[type="text"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px var(--primary-glow);
    background: rgba(11, 18, 24, 0.9);
}

select option {
    background: var(--surface);
    color: #fff;
}

/* Admin Login Layout */
.login-card {
    max-width: 450px;
    margin: 100px auto;
}

.login-form {
    margin-top: 30px;
}

/* Alert Notification Bars */
.alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.alert-danger {
    background: rgba(211, 47, 47, 0.12);
    border: 1px solid var(--danger);
    color: #ff8a8a;
}

.alert-success {
    background: rgba(0, 138, 75, 0.12);
    border: 1px solid var(--success);
    color: #81c784;
}

/* Dashboard Container & Grid Layouts */
.dashboard-container {
    padding-top: 10px;
}

.admin-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.admin-actions {
    display: flex;
    gap: 15px;
}

/* Dashboard Navigation Tabs */
.dashboard-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1px;
}

.tab-link {
    padding: 14px 28px;
    color: var(--text-muted);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    background: transparent;
    cursor: pointer;
}

.tab-link:hover {
    color: #fff;
}

.tab-link.active {
    color: #fff;
    border-bottom-color: var(--success);
}

/* Tab contents control */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Stats Cards Grid */
.stats-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 35px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}

.stat-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    background: rgba(255, 255, 255, 0.05);
}

.stat-icon-wrapper.blue { background: rgba(0, 163, 166, 0.15); color: #00E5FF; }
.stat-icon-wrapper.green { background: rgba(0, 138, 75, 0.15); color: #00E676; }
.stat-icon-wrapper.gold { background: rgba(251, 192, 45, 0.15); color: #FBC02D; }
.stat-icon-wrapper.red { background: rgba(211, 47, 47, 0.15); color: #FF5252; }

.stat-data {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.1;
}

.stat-value .max-val {
    font-size: 15px;
    color: var(--text-muted);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 25px;
    margin-bottom: 35px;
}

.chart-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}

.chart-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-muted);
}

.chart-wrapper {
    height: 280px;
    position: relative;
}

/* Control Panel Section (Actions panel) */
.control-panel-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 25px;
    margin-bottom: 35px;
}

@media(max-width: 900px){
    .control-panel-grid {
        grid-template-columns: 1fr;
    }
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

.panel-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    height: 100%;
}

.panel-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
}

/* Data Table Card styling */
.data-table-card {
    padding: 24px;
}

.table-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.table-header-row h2 {
    font-size: 18px;
    font-weight: 600;
}

.table-search-wrapper {
    width: 300px;
}

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

.dashboard-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    text-align: left;
}

.dashboard-table th {
    background: rgba(0, 0, 0, 0.25);
    padding: 16px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border);
}

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

.table-row-main {
    transition: var(--transition);
}

.table-row-main:hover {
    background: rgba(255, 255, 255, 0.02);
}

.table-row-main.detail-expanded {
    background: rgba(14, 54, 53, 0.08);
}

/* Badges for status and attendee type */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-align: center;
}

.badge-success { background: rgba(0, 138, 75, 0.15); color: #00E676; border: 1px solid rgba(0, 230, 118, 0.3); }
.badge-secondary { background: rgba(255, 255, 255, 0.05); color: var(--text-muted); border: 1px solid var(--border); }
.badge-warning { background: rgba(245, 124, 0, 0.15); color: #FFA726; border: 1px solid rgba(255, 167, 38, 0.3); }
.badge-danger { background: rgba(211, 47, 47, 0.15); color: #FF5252; border: 1px solid rgba(255, 82, 82, 0.3); }
.badge-vip { background: rgba(251, 192, 45, 0.15); color: #FFD54F; border: 1px solid rgba(251, 192, 45, 0.4); }

.btn-detail-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-detail-toggle:hover {
    border-color: var(--primary);
    background: rgba(14, 54, 53, 0.1);
}

/* Expandable row drawer */
.table-row-details td {
    padding: 0;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.25);
}

.hidden-detail {
    display: none;
}

.details-panel-content {
    padding: 24px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.detail-section {
    background: rgba(11, 18, 24, 0.4);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
}

.detail-section h4 {
    margin-bottom: 12px;
    font-size: 14px;
    color: #fff;
    border-bottom: 1px solid var(--border);
    padding-bottom: 6px;
}

.detail-section.full-width {
    grid-column: span 2;
}

.presentation-scores-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.pres-score-item {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    align-items: center;
}

.pres-lbl {
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 320px;
}

.suggestions-comment-text {
    font-style: italic;
    color: var(--text-muted);
    font-size: 14px;
    white-space: pre-line;
}

/* Excel upload drag drop styling */
.file-upload-wrapper {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    background: rgba(11, 18, 24, 0.3);
    transition: var(--transition);
    cursor: pointer;
}

.file-upload-wrapper:hover {
    border-color: var(--success);
    background: rgba(11, 18, 24, 0.6);
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 32px;
    margin-bottom: 10px;
    display: block;
}

.upload-text {
    font-size: 14px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 5px;
}

.upload-filename {
    font-weight: 600;
    color: #fff;
    font-size: 13px;
    display: none;
    margin-top: 10px;
}

/* Flex utilities */
.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.gap-10 { gap: 10px; }
.gap-15 { gap: 15px; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }

/* Responsive Enhancements for Mobile & Tablets */
@media (max-width: 768px) {
    .admin-header-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .admin-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .dashboard-tabs {
        overflow-x: auto;
        white-space: nowrap;
        gap: 5px;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 5px;
    }

    .tab-link {
        padding: 10px 18px;
        font-size: 14px;
        flex-shrink: 0;
    }

    .stats-cards-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 15px;
    }

    .stat-card {
        padding: 16px;
        gap: 12px;
    }

    .stat-value {
        font-size: 22px;
    }

    .chart-wrapper {
        height: 240px;
    }

    .details-panel-content {
        grid-template-columns: 1fr;
        padding: 16px;
        gap: 15px;
    }

    .detail-section.full-width {
        grid-column: span 1;
    }

    .table-header-row {
        flex-direction: column;
        align-items: stretch;
    }

    .table-search-wrapper {
        width: 100%;
    }

    .login-card {
        padding: 24px;
        margin: 40px auto;
    }
}