:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-border: #e5e5e5;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-text-light: #888888;
    --color-accent: #ff8c42;
    --color-accent-hover: #ff7028;
    --color-accent-light: #fff3eb;
    --color-success: #22c55e;
    --color-error: #ef4444;
    --color-badge-stable: #3b82f6;
    --color-badge-quality: #8b5cf6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.main-nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.15s;
}

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

.nav-links a.active {
    color: var(--color-accent);
    font-weight: 500;
}

.hero {
    padding: 64px 0 48px;
    text-align: center;
}

.hero h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
}

.subtitle {
    font-size: 16px;
    color: var(--color-text-muted);
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.products {
    padding: 48px 0;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.product-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.product-name {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-accent);
}

.product-tagline {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-text);
}

.product-description {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.product-link {
    display: inline-block;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.15s;
}

.product-link:hover {
    color: var(--color-accent-hover);
}

.contact {
    padding: 64px 0;
    text-align: center;
    background: var(--color-accent-light);
}

.contact-label {
    font-size: 16px;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.contact-email {
    font-size: 20px;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s;
}

.contact-email:hover {
    color: var(--color-accent-hover);
}

.main-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 32px 0;
    text-align: center;
}

.main-footer p {
    font-size: 14px;
    color: var(--color-text-light);
}

.page-header {
    padding: 48px 0 32px;
    text-align: center;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--color-text-muted);
}

.pricing-page {
    min-height: calc(100vh - 200px);
    padding-bottom: 48px;
}

.pricing-table-wrapper {
    overflow-x: auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

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

.pricing-table thead {
    background: var(--color-bg);
}

.pricing-table th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
}

.pricing-table td {
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

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

.pricing-table tbody tr:hover {
    background: var(--color-bg);
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    margin-left: 8px;
    white-space: nowrap;
}

.badge-stable {
    background: #dbeafe;
    color: var(--color-badge-stable);
}

.badge-quality {
    background: #ede9fe;
    color: var(--color-badge-quality);
}

.connect-page {
    min-height: calc(100vh - 200px);
    padding-bottom: 48px;
}

#integration-content {
    margin-top: 32px;
}

.login-page {
    min-height: calc(100vh - 200px);
    padding: 48px 0;
}

.auth-container {
    max-width: 480px;
    margin: 0 auto;
}

.auth-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.auth-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 32px;
    text-align: center;
}

.auth-form {
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
}

.form-group input {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.btn {
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.15s, transform 0.1s;
    min-height: 44px;
}

.btn:active {
    transform: translateY(1px);
}

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

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

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

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

.btn-full {
    width: 100%;
}

.btn-text {
    background: none;
    border: none;
    color: var(--color-accent);
    padding: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: color 0.15s;
}

.btn-text:hover {
    color: var(--color-accent-hover);
}

.auth-toggle-wrapper {
    text-align: center;
    padding: 16px 0;
}

.status-message {
    padding: 12px;
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-top: 16px;
    text-align: center;
}

.status-message:empty {
    display: none;
}

.status-message.success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.status-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.account-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    margin-top: 24px;
}

.account-panel h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
}

.account-info {
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

.account-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.account-email {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
}

.key-section h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.key-display {
    margin-top: 16px;
}

.key-input-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.key-input-group input {
    flex: 1;
    padding: 12px;
    font-size: 14px;
    font-family: monospace;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
}

.btn-icon {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px;
    cursor: pointer;
    transition: background-color 0.15s;
    min-width: 44px;
    min-height: 44px;
}

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

.icon-eye {
    font-size: 16px;
}

.account-actions {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 16px 24px;
        gap: 16px;
    }

    .nav-links {
        gap: 20px;
        font-size: 14px;
    }

    .hero h1 {
        font-size: 28px;
    }

    .section-title {
        font-size: 24px;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }

    .product-card {
        padding: 24px;
    }

    .pricing-table {
        font-size: 13px;
    }

    .pricing-table thead {
        display: none;
    }

    .pricing-table tr {
        display: block;
        margin-bottom: 16px;
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
    }

    .pricing-table td {
        display: block;
        text-align: left;
        padding: 12px 16px;
        border: none;
        border-bottom: 1px solid var(--color-border);
    }

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

    .pricing-table td::before {
        content: attr(data-label) ": ";
        font-weight: 600;
        display: inline;
        margin-right: 8px;
    }

    .auth-card {
        padding: 32px 24px;
    }

    .account-panel {
        padding: 32px 24px;
    }

    .key-input-group {
        flex-wrap: wrap;
    }

    .key-input-group input {
        width: 100%;
    }

    .key-input-group button {
        flex: 1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .nav-container {
        padding: 12px 16px;
    }

    .nav-links {
        gap: 16px;
        font-size: 13px;
    }

    .hero {
        padding: 40px 0 32px;
    }

    .hero h1 {
        font-size: 24px;
    }

    .product-card {
        padding: 20px;
    }

    .product-name {
        font-size: 20px;
    }

    .auth-card,
    .account-panel {
        padding: 24px 16px;
    }
}

/* Integration and accessible state contracts. */
[hidden] { display: none !important; }
#integration-content { max-width: 900px; margin: 0 auto; }
.integration-intro { margin: 24px 0 32px; }
.integration-block { margin: 32px 0; padding-bottom: 24px; border-bottom: 1px solid #e5e5e5; }
.integration-block h2, .integration-block h3 { margin-bottom: 16px; }
#integration-content p { margin: 16px 0; line-height: 1.8; overflow-wrap: anywhere; }
#integration-content dd { margin: 8px 0 20px; overflow-wrap: anywhere; }
#integration-content dt { font-weight: 600; }
.code-block-wrapper pre { padding-top: 48px; }
.account-note { font-size: 14px; line-height: 1.7; color: #666; margin: 12px 0 24px; overflow-wrap: anywhere; }
.status-message.error { color: #b42318; }
button:disabled { opacity: .55; cursor: wait; }
:focus-visible { outline: 3px solid #e7792b; outline-offset: 4px; }

@media (max-width: 480px) { .nav-links { flex-wrap: wrap; justify-content: center; gap: 8px 16px; } .nav-links a { font-size: 13px; } .pricing-table td { overflow-wrap: anywhere; } }