/* =========================================
   Model API Relay - Apple Design System
   Based on DESIGN-apple.md
   ========================================= */

/* === CSS Variables (Design Tokens) === */
:root {
    /* Colors */
    --primary: #0066cc;
    --primary-focus: #0071e3;
    --primary-on-dark: #2997ff;
    --ink: #1d1d1f;
    --body: #1d1d1f;
    --body-on-dark: #ffffff;
    --body-muted: #cccccc;
    --ink-muted-80: #333333;
    --ink-muted-48: #7a7a7a;
    --divider-soft: #f0f0f0;
    --hairline: #e0e0e0;
    --canvas: #ffffff;
    --canvas-parchment: #f5f5f7;
    --surface-pearl: #fafafc;
    --surface-tile-1: #272729;
    --surface-tile-2: #2a2a2c;
    --surface-black: #000000;
    --surface-chip-translucent: #d2d2d7;
    --on-primary: #ffffff;
    --on-dark: #ffffff;

    /* Rounded */
    --radius-xs: 5px;
    --radius-sm: 8px;
    --radius-md: 11px;
    --radius-lg: 18px;
    --radius-pill: 9999px;

    /* Spacing */
    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 17px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --spacing-section: 80px;

    /* Typography */
    --font-display: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Inter', system-ui, sans-serif;
    --font-text: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Inter', system-ui, sans-serif;

    /* Shadows */
    --shadow-product: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;
}

/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-text);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.47;
    letter-spacing: -0.374px;
    color: var(--body);
    background: var(--canvas);
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

/* === Global Nav === */
.global-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--surface-black);
    color: var(--on-dark);
    font-family: var(--font-text);
    font-size: 12px;
    font-weight: 400;
    line-height: 1.0;
    letter-spacing: -0.12px;
    height: 44px;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
}

.global-nav-inner {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.global-nav a {
    color: var(--on-dark);
    opacity: 0.85;
    padding: 0 12px;
    font-size: 12px;
    transition: opacity 0.2s;
}

.global-nav a:hover {
    opacity: 1;
}

.global-nav .nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.global-nav .nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-logo {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.374px;
    color: var(--on-dark) !important;
    margin-right: var(--spacing-lg);
}

/* === Sub Nav (Frosted) === */
.sub-nav {
    position: fixed;
    top: 44px;
    left: 0;
    right: 0;
    z-index: 99;
    background: rgba(245, 245, 247, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    height: 52px;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-xl);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.sub-nav-inner {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sub-nav-title {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.231px;
    color: var(--ink);
}

.sub-nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sub-nav-links a {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.29;
    letter-spacing: -0.224px;
    color: var(--ink-muted-80);
    transition: color 0.2s;
}

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

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-text);
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: transform 0.1s ease, opacity 0.2s ease;
    -webkit-user-select: none;
    user-select: none;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--primary);
    color: var(--on-primary);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.0;
    padding: 11px 22px;
    border-radius: var(--radius-pill);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:focus {
    outline: 2px solid var(--primary-focus);
    outline-offset: 2px;
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    font-size: 17px;
    font-weight: 400;
    border: 1px solid var(--primary);
    padding: 11px 22px;
    border-radius: var(--radius-pill);
}

.btn-utility {
    background: var(--ink);
    color: var(--on-dark);
    font-size: 14px;
    font-weight: 400;
    line-height: 1.29;
    letter-spacing: -0.224px;
    padding: 8px 15px;
    border-radius: var(--radius-sm);
}

.btn-utility:hover {
    opacity: 0.9;
}

.btn-danger {
    background: #dc3545;
    color: white;
    font-size: 14px;
    padding: 8px 15px;
    border-radius: var(--radius-sm);
}

.btn-sm {
    font-size: 14px;
    padding: 8px 15px;
    border-radius: var(--radius-sm);
}

/* === Layout === */
.page-wrapper {
    padding-top: 96px; /* nav + subnav */
    min-height: 100vh;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-section) 0;
}

.section-light {
    background: var(--canvas);
}

.section-parchment {
    background: var(--canvas-parchment);
}

.section-dark {
    background: var(--surface-tile-1);
    color: var(--on-dark);
}

/* === Typography === */
h1, .h1 {
    font-family: var(--font-display);
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: 0;
    color: var(--ink);
}

h2, .h2 {
    font-family: var(--font-text);
    font-size: 34px;
    font-weight: 600;
    line-height: 1.47;
    letter-spacing: -0.374px;
    color: var(--ink);
}

h3, .h3 {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 400;
    line-height: 1.14;
    letter-spacing: 0.196px;
    color: var(--ink);
}

h4, .h4 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.231px;
}

.hero-display {
    font-family: var(--font-display);
    font-size: 56px;
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.28px;
}

.caption {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.43;
    letter-spacing: -0.224px;
    color: var(--ink-muted-48);
}

.fine-print {
    font-size: 12px;
    font-weight: 400;
    line-height: 1.0;
    letter-spacing: -0.12px;
    color: var(--ink-muted-48);
}

/* === Cards === */
.card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.card-parchment {
    background: var(--canvas-parchment);
}

.card-dark {
    background: var(--surface-tile-1);
    color: var(--on-dark);
}

/* === Table === */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--hairline);
    background: var(--canvas);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

thead {
    background: var(--canvas-parchment);
}

th {
    font-weight: 600;
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--hairline);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--ink-muted-48);
}

td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--divider-soft);
}

tr:hover {
    background: rgba(0, 0, 0, 0.02);
}

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

/* === Form Elements === */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--ink-muted-80);
}

.form-control {
    width: 100%;
    font-family: var(--font-text);
    font-size: 17px;
    font-weight: 400;
    padding: 12px 20px;
    border: 1px solid var(--hairline);
    border-radius: var(--radius-pill);
    background: var(--canvas);
    color: var(--ink);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    height: 44px;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

textarea.form-control {
    height: auto;
    min-height: 100px;
    border-radius: var(--radius-md);
    resize: vertical;
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%237a7a7a' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

/* === Status Badges === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: -0.12px;
}

.badge-active, .badge-success {
    background: rgba(52, 199, 89, 0.15);
    color: #34c759;
}

.badge-disabled, .badge-warning {
    background: rgba(255, 149, 0, 0.15);
    color: #ff9500;
}

.badge-error, .badge-banned {
    background: rgba(255, 59, 48, 0.15);
    color: #ff3b30;
}

.badge-info {
    background: rgba(0, 102, 204, 0.1);
    color: var(--primary);
}

/* === Stats Grid === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.stat-card .stat-value {
    font-family: var(--font-display);
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    color: var(--ink);
    margin-bottom: var(--spacing-xxs);
}

.stat-card .stat-label {
    font-size: 14px;
    color: var(--ink-muted-48);
}

/* === Alert / Messages === */
.alert {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-bottom: var(--spacing-md);
}

.alert-error {
    background: rgba(255, 59, 48, 0.1);
    color: #ff3b30;
    border: 1px solid rgba(255, 59, 48, 0.2);
}

.alert-success {
    background: rgba(52, 199, 89, 0.1);
    color: #34c759;
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.alert-info {
    background: rgba(0, 102, 204, 0.1);
    color: var(--primary);
    border: 1px solid rgba(0, 102, 204, 0.2);
}

/* === Modal === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--canvas);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal h2 {
    margin-bottom: var(--spacing-md);
    font-size: 24px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* === Breadcrumb === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 14px;
    color: var(--ink-muted-48);
    margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
    color: var(--ink-muted-48);
}

.breadcrumb .sep {
    color: var(--hairline);
}

/* === Page Header === */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
}

.page-header h1 {
    margin: 0;
}

.page-header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* === SSO Login Button === */
.sso-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--surface-black);
    color: var(--on-dark);
    padding: 14px 28px;
    border-radius: var(--radius-pill);
    font-size: 18px;
    font-weight: 300;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.2s;
}

.sso-btn:hover {
    opacity: 0.85;
    color: var(--on-dark);
}

.sso-btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

/* === Playground === */
.playground-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    height: calc(100vh - 180px);
}

.playground-panel {
    display: flex;
    flex-direction: column;
}

.playground-panel h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 17px;
    font-weight: 600;
}

.playground-editor {
    flex: 1;
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 13px;
    padding: var(--spacing-md);
    resize: none;
    outline: none;
    background: var(--canvas-parchment);
    color: var(--ink);
    line-height: 1.5;
}

.playground-editor:focus {
    border-color: var(--primary);
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--ink-muted-48);
}

.empty-state p {
    font-size: 17px;
    margin-bottom: var(--spacing-md);
}

/* === Utility Classes === */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--ink-muted-48); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* === Token Display === */
.token-display {
    background: var(--canvas-parchment);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 14px;
    word-break: break-all;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.token-display .copy-btn {
    flex-shrink: 0;
    background: var(--primary);
    color: white;
    border: none;
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.token-display .copy-btn:hover {
    opacity: 0.85;
}

/* === Loading === */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--hairline);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* === Page-specific: Hero Section === */
.hero-section {
    padding: var(--spacing-section) 0;
    text-align: center;
}

.hero-section h1 {
    max-width: 720px;
    margin: 0 auto var(--spacing-md);
}

.hero-section p {
    font-size: 21px;
    font-weight: 400;
    line-height: 1.47;
    color: var(--ink-muted-48);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

/* === Login Page === */
.login-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    padding: var(--spacing-section) 0;
}

.login-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.login-card .login-icon {
    width: 64px;
    height: 64px;
    background: var(--canvas-parchment);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 28px;
}

.login-card h2 {
    margin-bottom: var(--spacing-xs);
}

.login-card .caption {
    margin-bottom: var(--spacing-xl);
}

/* === Responsive === */
@media (max-width: 1068px) {
    .playground-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    .hero-display {
        font-size: 40px;
    }

    h1, .h1 {
        font-size: 34px;
    }
}

@media (max-width: 834px) {
    .global-nav .nav-links a:not(.nav-logo) {
        display: none;
    }
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .hero-display {
        font-size: 34px;
    }
}

/* === Dark mode support === */
@media (prefers-color-scheme: dark) {
    :root {
        --canvas: #1c1c1e;
        --canvas-parchment: #2c2c2e;
        --ink: #f5f5f7;
        --body: #f5f5f7;
        --hairline: #38383a;
        --divider-soft: #38383a;
        --ink-muted-48: #98989d;
        --ink-muted-80: #c7c7cc;
        --surface-pearl: #2c2c2e;
        --surface-black: #000000;
        --on-primary: #ffffff;
    }

    .card, .stat-card, .token-display {
        background: var(--surface-pearl);
    }

    .table-container {
        background: var(--surface-pearl);
    }

    thead {
        background: var(--canvas-parchment);
    }

    .form-control {
        background: var(--canvas-parchment);
        color: var(--ink);
    }

    .playground-editor {
        background: var(--canvas-parchment);
        color: var(--ink);
    }

    .global-nav {
        background: #000;
    }
}

/* === Footer === */
.footer {
    background: var(--canvas-parchment);
    color: var(--ink-muted-48);
    font-size: 12px;
    padding: 64px 0;
    margin-top: auto;
}

.footer-inner {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--ink-muted-48);
    border-radius: 3px;
}

/* === Tooltips === */
[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 5px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--ink);
    color: var(--on-dark);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    white-space: nowrap;
    z-index: 999;
}

/* === Inline Code === */
code, .code {
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 13px;
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
}

/* === Pagination === */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

.pagination a, .pagination span {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--ink-muted-48);
    transition: background 0.2s;
}

.pagination a:hover {
    background: var(--divider-soft);
}

.pagination .current {
    background: var(--primary);
    color: var(--on-primary);
}