:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #10b981;
    --danger: #ef4444;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Glassmorphism Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.1) 0%, transparent 40%);
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
    text-align: center;
}

.countdown-container {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 3rem 0;
}

.countdown-item {
    background: var(--glass);
    padding: 1.5rem;
    border-radius: 16px;
    min-width: 100px;
    text-align: center;
    border: 1px solid var(--glass-border);
}

.countdown-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.countdown-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input[type="text"], input[type="password"], input[type="datetime-local"], textarea, select {
    width: 100%;
    padding: 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: #fff;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--glass);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

/* Admin Styles */
.sidebar {
    width: 280px;
    background: rgba(15, 23, 42, 0.95);
    border-right: 1px solid var(--glass-border);
    padding: 2rem;
    height: 100vh;
    position: fixed;
}

.main-content {
    margin-left: 280px;
    padding: 2rem;
    flex-grow: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    transition: all 0.2s;
}

.nav-link.active, .nav-link:hover {
    background: var(--glass);
    color: #fff;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 2rem;
}

th {
    text-align: left;
    padding: 1rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--glass-border);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

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

.status-lulus {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.status-tidak-lulus {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

/* Theme Picker */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.theme-option {
    border: 2px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.theme-option:hover {
    border-color: var(--primary);
    background: var(--glass);
}

.theme-option.active {
    border-color: var(--primary);
    background: rgba(255,255,255,0.05);
    box-shadow: 0 0 0 4px rgba(255,255,255,0.05);
}

.theme-preview {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin: 0 auto 0.75rem;
    border: 2px solid rgba(255,255,255,0.2);
}

/* Preloader */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-content {
    text-align: center;
}

.logo-animation {
    width: 150px;
    height: auto;
    animation: pulseLogo 2s infinite ease-in-out;
}

@keyframes pulseLogo {
    0%, 100% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; filter: drop-shadow(0 0 20px var(--primary)); }
}

.loader-line {
    width: 200px;
    height: 3px;
    background: var(--glass);
    margin-top: 2rem;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.loader-line::after {
    content: '';
    position: absolute;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary);
    animation: loadingLine 2s infinite;
}

@keyframes loadingLine {
    0% { left: -100%; }
    100% { left: 100%; }
}