:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #64748b;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-user span {
    font-weight: 500;
    color: var(--text);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    transition: background 0.2s, opacity 0.2s;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #475569;
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

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

.btn-outline:hover {
    background: var(--bg);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-full {
    width: 100%;
}

.btn-icon {
    padding: 0.375rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: 4px;
}

.btn-icon:hover {
    background: var(--bg);
    color: var(--text);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.75rem;
}

.search-bar {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.search-bar input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

.error-message {
    background: #fef2f2;
    color: var(--error);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.success-message {
    background: #f0fdf4;
    color: var(--success);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state p {
    margin-bottom: 1rem;
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 1rem;
}

.login-card {
    background: var(--surface);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.login-card h1 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Dashboard */
.dashboard-header {
    margin-bottom: 2rem;
}

.dashboard-header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.welcome-text {
    color: var(--text-muted);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
}

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

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 0.25rem 0 0.75rem;
}

.stat-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-link:hover {
    text-decoration: underline;
}

.quick-actions h2,
.admin-quick h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.action-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    text-decoration: none;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.action-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.action-icon {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.action-label {
    color: var(--text);
    font-weight: 500;
    font-size: 0.875rem;
}

/* Tables */
.data-table {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.data-table td {
    font-size: 0.875rem;
}

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

.data-table tr:hover td {
    background: #f8fafc;
}

.data-table .actions {
    display: flex;
    gap: 0.5rem;
}

.data-table .truncate {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Links page */
.links-table .link-url {
    color: var(--primary);
    text-decoration: none;
}

.links-table .link-url:hover {
    text-decoration: underline;
}

.links-table .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.links-table .tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
}

/* Collections grid */
.collections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.collection-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.collection-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.collection-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.collection-card .meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.collection-card .badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-static {
    background: #dbeafe;
    color: #1e40af;
}

.badge-dynamic {
    background: #fef3c7;
    color: #92400e;
}

.badge-public {
    background: #dcfce7;
    color: #166534;
}

.badge-private {
    background: #f1f5f9;
    color: #475569;
}

.collection-card .actions {
    display: flex;
    gap: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* API Keys */
.api-keys-table .key-value {
    font-family: "Fira Code", "Cascadia Code", monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.api-keys-table .status-active {
    color: var(--success);
    font-weight: 500;
}

.api-keys-table .status-inactive {
    color: var(--error);
    font-weight: 500;
}

.key-result {
    margin: 1rem 0;
}

.key-display {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    background: var(--bg);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin: 0.75rem 0;
}

.key-display code {
    flex: 1;
    font-family: "Fira Code", "Cascadia Code", monospace;
    font-size: 0.875rem;
    word-break: break-all;
}

/* Users table */
.users-table .role-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.role-admin {
    background: #fef3c7;
    color: #92400e;
}

.role-user {
    background: #e0e7ff;
    color: #3730a3;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1.5rem;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-content.modal-sm {
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h2 {
    font-size: 1.25rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.25rem;
    line-height: 1;
}

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

/* Hero (legacy) */
.hero {
    text-align: center;
    padding: 4rem 1rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.section {
    margin: 3rem 0;
}

.section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.card p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.card a {
    color: var(--primary);
    text-decoration: none;
}

.feature-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 0.75rem;
}

.feature-list li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
}

.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1rem;
    border-radius: var(--radius);
    margin: 1rem 0;
    overflow-x: auto;
}

.code-block code {
    font-family: "Fira Code", "Cascadia Code", monospace;
    font-size: 0.875rem;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 4rem;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .hero-actions {
        flex-direction: column;
    }
    .page-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    .data-table {
        overflow-x: auto;
    }
    .data-table table {
        min-width: 600px;
    }
}