:root {
    /* Event Brand & Theme Colors */
    --color-primary: #6b1426;         /* Elegant Maroon / Burgundy */
    --color-primary-dark: #4d0d1a;
    --color-primary-light: #8e1d34;
    --color-accent: #cfa847;          /* Regal Gold */
    --color-accent-light: #e4c776;

    /* Semantic Status Colors */
    --color-success: #198754;
    --color-success-bg: #d1e7dd;
    --color-danger: #dc3545;
    --color-danger-bg: #f8d7da;
    --color-warning: #ffc107;
    --color-warning-bg: #fff3cd;
    --color-info: #0dcaf0;

    /* Neutrals & Surfaces */
    --color-bg: #f8f9fa;
    --color-card-bg: #ffffff;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text-main: #1f2937;
    --color-text-muted: #6b7280;
    --color-text-white: #ffffff;

    /* Category Distinction Colors */
    --color-male: #1d4ed8;            /* Vibrant Blue */
    --color-male-bg: #eff6ff;
    --color-female: #be185d;          /* Vibrant Rose */
    --color-female-bg: #fdf2f8;

    /* Typography & Hierarchy */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;

    /* Spacing & Radii */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Bottom sticky bar height */
    --bottom-bar-height: 84px;
}

/* Global Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-bottom: env(safe-area-inset-bottom, 20px);
}

/* Containers */
.container {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    padding: var(--spacing-4);
}

.container-wide {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--spacing-4);
}

/* Header & Placeholders */
.header {
    text-align: center;
    padding: var(--spacing-4) 0;
}

.logo-placeholder {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-3);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-accent);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-2xl);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-accent);
}

.event-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-1);
}

.event-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Cards & Forms */
.card {
    background: var(--color-card-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-5);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-4);
}

.form-group {
    margin-bottom: var(--spacing-4);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-2);
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-1);
}

.form-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--color-text-main);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    text-transform: uppercase;
}

.form-input.no-transform {
    text-transform: none;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 20, 38, 0.15);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-5);
    font-size: var(--font-size-lg);
    font-weight: 700;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease, transform 0.05s ease;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

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

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

.btn-secondary {
    background-color: #e2e8f0;
    color: var(--color-text-main);
}

.btn-secondary:hover {
    background-color: #cbd5e1;
}

.btn:disabled, .btn[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Category Sections */
.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-3);
    font-weight: 700;
}

.category-male {
    background-color: var(--color-male-bg);
    color: var(--color-male);
    border-left: 5px solid var(--color-male);
}

.category-female {
    background-color: var(--color-female-bg);
    color: var(--color-female);
    border-left: 5px solid var(--color-female);
}

.wallet-badge {
    background: #fff;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-sm);
}

/* Model Grid & Card */
.model-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

@media (min-width: 600px) {
    .model-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.model-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    text-align: center;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.model-photo-wrapper {
    width: 100%;
    aspect-ratio: 3 / 4;
    background-color: #f1f5f9;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.model-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.model-number-tag {
    position: absolute;
    top: var(--spacing-2);
    left: var(--spacing-2);
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    font-weight: 800;
    font-size: var(--font-size-sm);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
}

.model-info {
    padding: var(--spacing-2);
}

.model-name {
    font-weight: 700;
    font-size: var(--font-size-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Model Card Interactivity & Single Selection */
.model-card {
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

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

.model-card.selected {
    border: 2px solid var(--color-primary);
    box-shadow: 0 0 0 3px rgba(107, 20, 38, 0.25);
}

.model-card.selected .model-photo-wrapper::after {
    content: '✓ SELECTED';
    position: absolute;
    bottom: var(--spacing-2);
    right: var(--spacing-2);
    background: var(--color-primary);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.model-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Selection Button at bottom of card */
.btn-select-model {
    width: 100%;
    border: none;
    border-top: 1px solid var(--color-border);
    background: #f8fafc;
    color: var(--color-text-main);
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: var(--spacing-2) var(--spacing-1);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.model-card:hover .btn-select-model {
    background: #f1f5f9;
}

.model-card.selected .btn-select-model {
    background: var(--color-primary);
    color: #ffffff;
    font-weight: 800;
}

.btn-select-model:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Sticky Bottom Action Bar */
.bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 2px solid var(--color-border);
    box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
    padding: var(--spacing-3) var(--spacing-4);
    z-index: 500;
}

.bottom-bar-inner {
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-3);
}

.bottom-tally {
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.bottom-tally span {
    display: block;
}

/* Modal Confirmation & Impact Popup */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
    z-index: 1000;
}

.modal-card {
    background: #fff;
    border-radius: var(--radius-md);
    max-width: 480px;
    width: 100%;
    padding: var(--spacing-5);
    box-shadow: var(--shadow-lg);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: 800;
    margin-bottom: var(--spacing-3);
    color: var(--color-primary-dark);
}

.summary-list {
    list-style: none;
    margin: var(--spacing-3) 0;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--color-border);
}

/* Impact Progress Line */
.countdown-line {
    width: 100%;
    height: 6px;
    background-color: #e2e8f0;
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: var(--spacing-4) 0 var(--spacing-2);
}

.countdown-bar {
    height: 100%;
    background-color: var(--color-primary);
    width: 100%;
    transition: width linear;
}

.impact-bar-track {
    background: #f1f5f9;
    height: 14px;
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--spacing-1);
}

.impact-bar-fill {
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    height: 100%;
    border-radius: var(--radius-full);
}

/* Admin Specific */
.admin-nav {
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-3) var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.admin-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.admin-links {
    display: flex;
    gap: var(--spacing-3);
}

.admin-links a {
    color: var(--color-text-main);
    text-decoration: none;
    font-weight: 600;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
}

.admin-links a.active {
    background-color: var(--color-primary);
    color: #fff;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-3);
    font-size: var(--font-size-sm);
}

.data-table th, .data-table td {
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid var(--color-border);
    text-align: left;
}

.data-table th {
    background-color: #f8fafc;
    font-weight: 700;
}