/* ================================================
   Admin Events - Modern Design System
   ================================================ */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --info-color: #0ea5e9;
    --info-hover: #0284c7;
    
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    --white: #ffffff;
    --black: #000000;
    
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Typography */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
}

/* Main Content Layout */
.admin-main-content {
    min-height: 100vh;
    background: var(--gray-50);
    padding-top: 80px;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: var(--white);
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.3;
    pointer-events: none;
}

.page-header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    margin-bottom: 1.5rem;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.back-link svg {
    transition: var(--transition);
}

.back-link:hover svg {
    transform: translateX(-2px);
}

.page-title-section {
    text-align: center;
    margin-top: 1rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-description {
    font-size: 1.125rem;
    opacity: 0.9;
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Content Container */
.content-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Layout Grid */
.layout-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    align-items: start;
}

/* Sidebar Card */
.sidebar-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    position: sticky;
    top: 2rem;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.sidebar-header svg {
    color: var(--primary-color);
    width: 24px;
    height: 24px;
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.sidebar-nav {
    padding: 1rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem 1rem;
    border: none;
    background: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 0.5rem;
    text-align: left;
}

.sidebar-link:hover {
    background: var(--gray-100);
    color: var(--gray-800);
    transform: translateX(4px);
}

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

.sidebar-link.active:hover {
    background: var(--primary-hover);
    transform: translateX(4px);
}

.sidebar-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Main Content Area */
.main-content-area {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

/* Content Section */
.content-section {
    padding: 2rem;
}

.content-section.hidden {
    display: none;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.section-title h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
    letter-spacing: -0.02em;
}

.section-title p {
    font-size: 1rem;
    color: var(--gray-600);
    margin: 0;
}

.section-actions {
    display: flex;
    gap: 1rem;
}

/* Back Button */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

.back-btn:hover {
    background: var(--gray-200);
    border-color: var(--gray-300);
    transform: translateY(-1px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-transform: none;
    letter-spacing: 0.025em;
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-info:hover:not(:disabled) {
    background: var(--info-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Event Cards Grid */
.events-container {
    margin-top: 1.5rem;
}

.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

/* Event Card */
.event-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.event-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--gray-300);
}

.event-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    opacity: 0;
    transition: var(--transition);
}

.event-card:hover::before {
    opacity: 1;
}

.event-poster {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--gray-100);
}

.event-info {
    padding: 1.5rem;
}

.event-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
    line-height: 1.4;
}

.event-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.event-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.event-meta-item svg {
    width: 16px;
    height: 16px;
    color: var(--gray-400);
}

.event-description {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.5;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.event-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.event-actions .btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    min-width: auto;
}

/* Form Styling */
.form-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-top: 1.5rem;
    border: 1px solid var(--gray-200);
}

.event-form {
    max-width: none;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-input {
    padding: 0.875rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-sm);
    font-size: 0.9375rem;
    transition: var(--transition);
    background: var(--white);
    color: var(--gray-800);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-input:disabled {
    background: var(--gray-50);
    color: var(--gray-500);
    cursor: not-allowed;
}

.form-help {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Radio Group */
.radio-group {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.radio-option {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0.875rem 1.5rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    border: 1px solid var(--gray-300);
    background: var(--white);
    min-width: 120px;
    position: relative;
}

.radio-option:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    margin: 0;
    z-index: 1;
}

.radio-option input[type="radio"]:checked ~ .radio-label {
    color: var(--white);
    font-weight: 600;
}

.radio-option:has(input[type="radio"]:checked) {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

.radio-option:has(input[type="radio"]:checked):hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.radio-label {
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.875rem;
    user-select: none;
    transition: var(--transition);
    text-align: center;
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

/* File Input */
.file-input {
    position: relative;
    cursor: pointer;
}

.file-input::-webkit-file-upload-button {
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    margin-right: 1rem;
}

.file-input::-webkit-file-upload-button:hover {
    background: var(--gray-200);
    border-color: var(--gray-400);
}

/* Loading States */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--gray-500);
    font-size: 1.125rem;
}

.loading::before {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.75rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--gray-500);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--gray-300);
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-700);
    margin: 0 0 0.5rem 0;
}

.empty-state p {
    font-size: 1rem;
    margin: 0;
}

/* Settings Placeholder */
.settings-placeholder {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--gray-500);
}

.settings-placeholder svg {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--gray-300);
}

.settings-placeholder h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-700);
    margin: 0 0 0.5rem 0;
}

.settings-placeholder p {
    font-size: 1rem;
    margin: 0;
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.visible .modal-content {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--gray-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 1;
}

.modal-close-btn:hover {
    background: var(--gray-200);
    transform: scale(1.1);
}

.modal-close-btn svg {
    width: 20px;
    height: 20px;
    color: var(--gray-600);
}

.modal-body {
    padding: 2rem;
}

/* Participants Modal */
.participants-modal {
    max-width: 800px;
}

.participants-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.participants-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
}

.participants-count {
    font-size: 1rem;
    color: var(--gray-600);
    margin: 0;
}

.participants-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.participant-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    background: var(--gray-50);
    transition: var(--transition);
}

.participant-item:hover {
    background: var(--white);
    border-color: var(--gray-300);
}

.participant-info h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
}

.participant-info p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0 0 0.25rem 0;
}

.participant-status {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-end;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-present {
    background: var(--success-color);
    color: var(--white);
}

.status-not-set {
    background: var(--gray-200);
    color: var(--gray-700);
}

.status-paid {
    background: var(--success-color);
    color: var(--white);
}

.status-unpaid {
    background: var(--warning-color);
    color: var(--white);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}

.event-card {
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.event-card.removing {
    animation: fadeOut 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .layout-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .sidebar-card {
        position: static;
    }
    
    .sidebar-nav {
        display: flex;
        gap: 0.5rem;
        overflow-x: auto;
        padding: 1rem;
    }
    
    .sidebar-link {
        white-space: nowrap;
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .page-header {
        padding: 2rem 0;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-description {
        font-size: 1rem;
    }
    
    .content-container {
        padding: 1rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .events-grid {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        flex-direction: column-reverse;
        gap: 0.75rem;
    }
    
    .form-actions .btn {
        width: 100%;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .radio-option {
        min-width: auto;
    }
    
    .participant-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .participant-status {
        align-items: flex-start;
        flex-direction: row;
    }
}

@media (max-width: 480px) {
    .page-header-content {
        padding: 0 1rem;
    }
    
    .back-link {
        margin-bottom: 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .event-card,
    .sidebar-card,
    .form-container {
        border-width: 2px;
    }
    
    .btn {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Error message styling */
.error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Success message styling */
.success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}