/* ============================================================
   Global Styles
   ============================================================ */

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary-color: #64748b;
    --success-color: #16a34a;
    --error-color: #dc2626;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --shadow: 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);
    --radius: 12px;
    --radius-sm: 6px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
}

/* ============================================================
   Authentication Container
   ============================================================ */

.auth-container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px 32px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.auth-card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.auth-header .subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

/* ============================================================
   Forms
   ============================================================ */

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input {
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 16px;
    transition: var(--transition);
    background: #fafafa;
    color: var(--text-color);
    width: 100%;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 44px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px;
    opacity: 0.6;
    transition: var(--transition);
}

.toggle-password:hover {
    opacity: 1;
}

.form-options {
    display: flex;
    justify-content: flex-end;
    margin-top: -8px;
}

.forgot-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.forgot-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
    display: inline-block;
    width: 100%;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3);
}

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

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

.btn-secondary:hover {
    background: #475569;
}

.btn-link {
    background: none;
    color: var(--primary-color);
    width: auto;
    padding: 8px 0;
    font-size: 14px;
}

.btn-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.btn-block {
    width: 100%;
}

/* ============================================================
   Messages
   ============================================================ */

.auth-error,
.auth-success {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-top: 4px;
}

.auth-error {
    background: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fca5a5;
}

.auth-success {
    background: #f0fdf4;
    color: var(--success-color);
    border: 1px solid #86efac;
}

/* ============================================================
   Footer
   ============================================================ */

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.auth-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ============================================================
   Responsive Design
   ============================================================ */

@media (max-width: 480px) {
    .auth-card {
        padding: 28px 20px;
    }

    .auth-header h1 {
        font-size: 24px;
    }

    .form-group input {
        font-size: 14px;
        padding: 8px 12px;
    }

    .btn {
        font-size: 14px;
        padding: 10px 16px;
    }
}

/* ============================================================
   Utility Classes
   ============================================================ */

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

.mt-2 {
    margin-top: 8px;
}

.mt-4 {
    margin-top: 16px;
}

/* ============================================================
   Top Navigation Bar (dashboard / catalog pages)
   ============================================================ */

body.app-body {
    display: block;
    align-items: initial;
    justify-content: initial;
    padding: 0;
}

.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.navbar-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

.navbar-links a:hover,
.navbar-links a.active {
    color: var(--primary-color);
}

.navbar-user {
    font-size: 13px;
    color: var(--text-muted);
}

.btn-logout {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    width: auto;
    transition: var(--transition);
}

.btn-logout:hover {
    background: #fef2f2;
    border-color: var(--error-color);
    color: var(--error-color);
}

/* ============================================================
   Page Container / Header
   ============================================================ */

.page-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 32px 24px 60px;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-color);
}

.page-header p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

/* ============================================================
   Exam / Course Cards Grid
   ============================================================ */

.exam-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.exam-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: var(--transition);
}

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

.exam-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.exam-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-color);
}

.exam-card .exam-description {
    font-size: 14px;
    color: var(--text-muted);
    flex-grow: 1;
}

.exam-card .exam-price {
    font-size: 15px;
    font-weight: 700;
    color: var(--primary-color);
}

.exam-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 6px;
}

/* Status badges */
.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.status-active {
    background: #f0fdf4;
    color: var(--success-color);
}

.status-locked {
    background: #f1f5f9;
    color: var(--secondary-color);
}

.status-pending {
    background: #fffbeb;
    color: #b45309;
}

.status-expired,
.status-suspended,
.status-revoked {
    background: #fef2f2;
    color: var(--error-color);
}

.btn-sm {
    width: auto;
    padding: 8px 16px;
    font-size: 13px;
}

/* ============================================================
   Empty / Loading States
   ============================================================ */

.empty-state,
.loading-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state h3 {
    color: var(--text-color);
    margin-bottom: 8px;
}

/* ============================================================
   Responsive: app pages
   ============================================================ */

@media (max-width: 640px) {
    .page-container {
        padding: 20px 16px 40px;
    }

    .exam-grid {
        grid-template-columns: 1fr;
    }
}
/* ============================================================
   Admin Panel (admin/access.html)
   ============================================================ */

.admin-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    padding: 2px 8px;
    border-radius: 999px;
    vertical-align: middle;
    margin-left: 6px;
}

.admin-panel {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 22px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.admin-panel-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-color);
}

.admin-search-form {
    display: flex;
    gap: 10px;
}

.admin-search-form input {
    flex: 1;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
}

.admin-search-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.admin-search-form button {
    width: auto;
}

.admin-search-status {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-muted);
}

.admin-search-status.error {
    color: var(--error-color);
}

.admin-student-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.admin-student-info strong {
    font-size: 16px;
    margin-right: 10px;
}

.admin-grant-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
    align-items: end;
}

.admin-grant-form .form-group {
    gap: 4px;
}

.admin-grant-form select,
.admin-grant-form input {
    padding: 9px 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    width: 100%;
}

.admin-grant-form button {
    height: 40px;
}

.admin-inline-message {
    margin-top: 12px;
    font-size: 13px;
}

.admin-inline-message.success { color: var(--success-color); }
.admin-inline-message.error { color: var(--error-color); }

.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.admin-table th {
    text-align: left;
    padding: 10px 8px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.admin-table td {
    padding: 10px 8px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.admin-table-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 24px 8px;
}

.admin-table .btn-sm {
    margin-right: 6px;
    margin-bottom: 4px;
}

.btn-warn {
    background: #fffbeb;
    color: #b45309;
    border: 1px solid #fcd34d;
}

.btn-warn:hover { background: #fef3c7; }

.btn-danger {
    background: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fca5a5;
}

.btn-danger:hover { background: #fee2e2; }

.admin-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
}

.admin-modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 400px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.admin-modal h3 {
    margin-bottom: 16px;
    font-size: 17px;
}

.admin-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 18px;
}

.admin-modal-actions .btn {
    width: auto;
}

@media (max-width: 640px) {
    .admin-search-form {
        flex-direction: column;
    }
    .admin-grant-form {
        grid-template-columns: 1fr;
    }
}