@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-glow: rgba(37, 99, 235, 0.15);
    --accent: #06b6d4;
    --accent-glow: rgba(6, 182, 212, 0.15);
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #263548;
    --bg-input: #0f172a;
    --border: #334155;
    --border-focus: #2563eb;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
    --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.4), 0 4px 10px -4px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== ANIMATED BACKGROUND ===== */
.bg-pattern {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.bg-pattern::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    animation: float 15s ease-in-out infinite;
}

.bg-pattern::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    bottom: -150px;
    left: -150px;
    animation: float 20s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* ===== LAYOUT ===== */
.container {
    position: relative;
    z-index: 1;
    max-width: 640px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.container.wide {
    max-width: 960px;
}

/* ===== HEADER / BRAND ===== */
.brand {
    text-align: center;
    margin-bottom: 32px;
}

.brand-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    box-shadow: 0 0 30px rgba(37, 99, 235, 0.3);
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 30px rgba(37, 99, 235, 0.3); }
    50% { box-shadow: 0 0 50px rgba(37, 99, 235, 0.5); }
}

.brand-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.brand h1 {
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
}

.brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
}

/* ===== CARD ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title .icon {
    width: 36px;
    height: 36px;
    background: var(--primary-glow);
    border-radius: var(--radius-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
}

/* ===== FORMS ===== */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: var(--primary-glow);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.8rem;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn .spinner {
    width: 18px;
    height: 18px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== STUDENT DATA CARD ===== */
.student-card {
    margin-top: 20px;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.student-info {
    display: grid;
    gap: 12px;
}

.info-row {
    display: flex;
    gap: 8px;
    padding: 10px 14px;
    background: var(--bg);
    border-radius: var(--radius-xs);
    border: 1px solid var(--border);
}

.info-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    min-width: 120px;
    flex-shrink: 0;
}

.info-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    word-break: break-word;
}

/* ===== SURAT TYPE SELECTOR ===== */
.surat-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 18px;
}

.surat-option {
    padding: 16px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.surat-option:hover {
    border-color: var(--primary);
    background: var(--primary-glow);
}

.surat-option.active {
    border-color: var(--primary);
    background: var(--primary-glow);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.surat-option .option-icon {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.surat-option .option-title {
    font-size: 0.85rem;
    font-weight: 600;
}

.surat-option .option-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* ===== ALERT / TOAST ===== */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    animation: slideUp 0.3s ease-out;
}

.alert-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner-lg {
    width: 56px;
    height: 56px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* ===== FOOTER / NAV ===== */
.nav-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-light);
}

/* ===== ADMIN TABLE ===== */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th {
    background: var(--bg);
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background: var(--bg-card-hover);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-aktif {
    background: var(--success-bg);
    color: var(--success);
}

.badge-pkh {
    background: var(--warning-bg);
    color: var(--warning);
}

/* ===== STATS BAR ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px;
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* ===== PAGINATION ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 20px;
}

.page-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.page-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

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

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state p {
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
    .container {
        padding: 16px;
    }
    
    .card {
        padding: 20px;
    }
    
    .brand h1 {
        font-size: 1.4rem;
    }
    
    .surat-selector {
        grid-template-columns: 1fr;
    }
    
    .info-row {
        flex-direction: column;
        gap: 2px;
    }
    
    .info-label {
        min-width: unset;
    }
    
    .stats-bar {
        grid-template-columns: 1fr 1fr;
    }
    
    .data-table {
        font-size: 0.8rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }
}

/* ===== FILTER BAR ===== */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-bar .form-input {
    flex: 1;
    min-width: 200px;
}

.filter-bar select.form-input {
    min-width: 160px;
    flex: 0 1 auto;
}

/* ===== ACTIONS ===== */
.actions {
    display: flex;
    gap: 6px;
}

/* ===== ADMIN HEADER ===== */
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
}

.admin-header .back-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.admin-header .back-link:hover {
    color: var(--primary-light);
}

/* ===== CONFIRM DIALOG ===== */
.dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(6px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.dialog-overlay.show {
    opacity: 1;
    visibility: visible;
}

.dialog {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: var(--transition);
}

.dialog-overlay.show .dialog {
    transform: scale(1);
}

.dialog h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.dialog p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.dialog-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}