:root {
    --primary-bg: #e8f0f7;
    --card-bg: #ffffff;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --accent: #000000;
    --border: #e0e0e0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--primary-bg);
    min-height: 100vh;
    padding-bottom: 0;
}

.header-tabs {
    background: transparent;
    border: none;
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 20px 0;
}

.nav-tabs {
    border: none;
    padding: 0;
    justify-content: center;
    gap: 40px;
}

.nav-tabs .nav-link {
    color: var(--text-light);
    font-weight: 400;
    padding: 8px 0;
    border: none;
    background: transparent;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    position: relative;
}

.nav-tabs .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.nav-tabs .nav-link:hover {
    color: var(--text-dark);
}

.nav-tabs .nav-link.active {
    color: var(--text-dark);
    background: transparent;
    font-weight: 500;
}

.nav-tabs .nav-link.active::after {
    width: 100%;
}

.main-container {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 60px;
    margin: 40px auto;
    max-width: 1200px;
    box-shadow: 0 10px 60px rgba(0, 0, 0, 0.08);
}

.page-title {
    font-size: 3.5rem;
    font-weight: 300;
    color: var(--text-dark);
    margin-bottom: 16px;
    text-align: center;
    letter-spacing: -1px;
    line-height: 1.2;
}

.page-subtitle {
    color: var(--text-light);
    text-align: center;
    margin-bottom: 60px;
    font-size: 1.1rem;
    font-weight: 300;
}

.card {
    border: none;
    border-radius: 16px;
    margin-bottom: 24px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.card-header {
    background: var(--card-bg);
    color: var(--text-dark);
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 24px 30px;
    font-weight: 500;
    font-size: 1.1rem;
    letter-spacing: -0.3px;
}

.card-body {
    padding: 30px;
    background: var(--card-bg);
}

.form-group {
    margin-bottom: 28px;
}

.form-group label {
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 10px;
    font-size: 0.9rem;
    letter-spacing: -0.2px;
}

.form-control, .form-select {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.form-control:focus, .form-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.05);
    outline: none;
}

.form-control:disabled {
    background-color: #f8f9fa;
    cursor: not-allowed;
    opacity: 0.6;
}

.ipk-display {
    background: var(--accent);
    color: var(--card-bg);
    font-weight: 600;
    font-size: 1.2rem;
    text-align: center;
    border-radius: 12px;
}

.btn {
    padding: 14px 32px;
    font-weight: 500;
    border-radius: 50px;
    border: none;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    letter-spacing: -0.2px;
}

.btn-primary {
    background: var(--accent);
    color: var(--card-bg);
}

.btn-primary:hover:not(:disabled) {
    background: var(--text-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text-dark);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: #f8f9fa;
    color: var(--text-dark);
    border-color: var(--text-dark);
}

.btn-info {
    background: var(--text-light);
    color: var(--card-bg);
}

.btn-info:hover {
    background: var(--accent);
    color: var(--card-bg);
}

.table {
    border: none;
    border-radius: 12px;
    overflow: hidden;
}

.table thead th {
    background: var(--card-bg);
    color: var(--text-dark);
    font-weight: 500;
    border: none;
    border-bottom: 2px solid var(--border);
    padding: 18px;
    font-size: 0.85rem;
    letter-spacing: -0.2px;
}

.table tbody td {
    padding: 18px;
    vertical-align: middle;
    border-color: var(--border);
    color: var(--text-dark);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: #f8f9fa;
}

.badge {
    padding: 8px 16px;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 20px;
    letter-spacing: -0.2px;
}

.bg-warning {
    background: #fbbf24 !important;
    color: var(--text-dark) !important;
}

.bg-success {
    background: #10b981 !important;
    color: var(--card-bg) !important;
}

.bg-danger {
    background: #ef4444 !important;
    color: var(--card-bg) !important;
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 18px 24px;
    font-weight: 400;
}

.alert-info {
    background: #dbeafe;
    color: var(--text-dark);
}

.alert-danger {
    background: #fee2e2;
    color: var(--text-dark);
}

.alert-success {
    background: #d1fae5;
    color: var(--text-dark);
}

.alert-warning {
    background: #fef3c7;
    color: var(--text-dark);
}

.footer {
    background: var(--card-bg);
    color: var(--text-light);
    text-align: center;
    padding: 40px 0;
    margin-top: 80px;
    font-size: 0.9rem;
    border-top: 1px solid var(--border);
}

.beasiswa-icon {
    width: 80px;
    height: 80px;
    background: var(--accent);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
    color: var(--card-bg);
    font-size: 2rem;
}

@media (max-width: 768px) {
    .nav-tabs {
        gap: 20px;
    }

    .nav-tabs .nav-link {
        padding: 8px 0;
        font-size: 0.85rem;
    }

    .main-container {
        padding: 30px 20px;
        margin: 20px;
        border-radius: 16px;
    }

    .page-title {
        font-size: 2rem;
    }

    .card-body {
        padding: 20px;
    }
}