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

/* ---------- Global Variables ---------- */
:root {
    --primary-color: #0A192F;
    --secondary-color: #4F46E5;
    --accent-color: #06B6D4;
    --bg-color: #F8FAFC;
    --surface-color: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --danger-color: #EF4444;
    --success-color: #10B981;
    --border-color: #E2E8F0;
    
    --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);
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.5);
    
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
}

.gradient-text {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ---------- Navigation (Glassmorphism) ---------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-md);
    display: inline-block;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-speed) ease;
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--secondary-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width var(--transition-speed) ease;
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

/* ---------- Hero Section ---------- */
.hero {
    padding: 6rem 5%;
    text-align: center;
    background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.1), transparent 40%),
                radial-gradient(circle at bottom left, rgba(79, 70, 229, 0.1), transparent 40%);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-family: inherit;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), #4338CA);
    color: #FFF;
    box-shadow: 0 4px 14px 0 rgba(79, 70, 229, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(79, 70, 229, 0.39);
}

.btn-outline {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
    background: var(--secondary-color);
    color: #FFF;
}

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

.btn-success:hover {
    background: #059669;
}

/* ---------- Main Layouts ---------- */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 5%;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* ---------- Card UI (Seminar List) ---------- */
.seminar-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.seminar-card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
}

.seminar-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    width: 100%;
    height: 180px;
    background-color: var(--border-color);
    object-fit: cover;
}

.card-image-placeholder {
    width: 100%;
    height: 180px;
    background: linear-gradient(45deg, #E2E8F0, #CBD5E1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 500;
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.card-meta i {
    color: var(--accent-color);
}

.progress-container {
    margin-top: auto;
    margin-bottom: 1.5rem;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 4px;
    transition: width 1s ease-in-out;
}

/* ---------- Admin Dashboard Layout ---------- */
.dashboard-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 992px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

.dashboard-panel {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
}

.panel-title {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

/* ---------- Forms ---------- */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    background-color: var(--bg-color);
}

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

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

/* ---------- Stats Cards (Admin) ---------- */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
}

.stat-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* ---------- Data Tables ---------- */
.table-responsive {
    overflow-x: auto;
}

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

.data-table th {
    background-color: var(--bg-color);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 1rem;
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background-color 0.2s ease;
}

.data-table tbody tr:hover {
    background-color: #F1F5F9;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-full {
    background-color: #FEE2E2;
    color: #991B1B;
}

.wasm-highlight {
    font-family: monospace;
    background: #E0E7FF;
    color: #3730A3;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: bold;
}

/* ---------- MyPage Specific ---------- */
.auth-container {
    max-width: 450px;
    margin: 4rem auto;
    text-align: center;
}

.ticket-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.ticket-card {
    display: flex;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    position: relative;
}

.ticket-card::before, .ticket-card::after {
    content: '';
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: var(--bg-color);
    border-radius: 50%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.ticket-card::before {
    left: -15px;
    box-shadow: inset -3px 0 5px rgba(0,0,0,0.05);
}

.ticket-card::after {
    right: -15px;
    box-shadow: inset 3px 0 5px rgba(0,0,0,0.05);
}

.ticket-date-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #FFF;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-width: 150px;
    border-right: 2px dashed rgba(255,255,255,0.3);
}

.ticket-date-section .day {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

.ticket-date-section .month {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.ticket-details {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ticket-info h3 {
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.ticket-info p {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ---------- Modals ---------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: transform var(--transition-speed) ease;
    position: relative;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: var(--danger-color);
}

.modal-header {
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* ---------- Mobile Optimization ---------- */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem 1.25rem;
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .navbar-brand {
        font-size: 1.35rem;
    }
    
    .nav-links {
        gap: 1.5rem;
    }
    
    .hero {
        padding: 3.5rem 1.25rem;
    }
    
    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .container {
        padding: 1.5rem 1.25rem;
    }
    
    .seminar-grid {
        grid-template-columns: 1fr;
    }

    .admin-tabs {
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        font-size: 0.9rem !important;
        padding: 0.4rem 0.6rem !important;
    }
    
    .modal-content {
        padding: 1.5rem;
        width: 90%;
    }
    
    .section-header h2 {
        font-size: 1.25rem;
    }
}