/* ===== Light Theme (default) ===== */
:root {
    --bg: #f8fafc;
    --bg-gradient-1: rgba(37, 99, 235, 0.06);
    --bg-gradient-2: rgba(16, 185, 129, 0.04);
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --border: #e2e8f0;
    --border-subtle: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --brand: #2563eb;
    --brand-hover: #1d4ed8;
    --brand-soft: #dbeafe;
    --brand-text: #1e40af;
    --accent: #10b981;
    --accent-soft: #d1fae5;
    --accent-text: #065f46;
    --danger: #ef4444;
    --danger-soft: #fee2e2;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --input-focus: #2563eb;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --hero-gradient: linear-gradient(135deg, #2563eb 0%, #10b981 100%);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: 200ms ease;
    color-scheme: light;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
    --bg: #0f172a;
    --bg-gradient-1: rgba(59, 130, 246, 0.08);
    --bg-gradient-2: rgba(52, 211, 153, 0.05);
    --surface: #1e293b;
    --surface-hover: #334155;
    --border: #334155;
    --border-subtle: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --brand: #3b82f6;
    --brand-hover: #60a5fa;
    --brand-soft: rgba(59, 130, 246, 0.15);
    --brand-text: #93c5fd;
    --accent: #34d399;
    --accent-soft: rgba(52, 211, 153, 0.15);
    --accent-text: #6ee7b7;
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.15);
    --input-bg: #1e293b;
    --input-border: #475569;
    --input-focus: #3b82f6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
    --hero-gradient: linear-gradient(135deg, #3b82f6 0%, #34d399 100%);
    color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #0f172a;
        --bg-gradient-1: rgba(59, 130, 246, 0.08);
        --bg-gradient-2: rgba(52, 211, 153, 0.05);
        --surface: #1e293b;
        --surface-hover: #334155;
        --border: #334155;
        --border-subtle: #1e293b;
        --text: #f1f5f9;
        --text-secondary: #94a3b8;
        --text-muted: #64748b;
        --brand: #3b82f6;
        --brand-hover: #60a5fa;
        --brand-soft: rgba(59, 130, 246, 0.15);
        --brand-text: #93c5fd;
        --accent: #34d399;
        --accent-soft: rgba(52, 211, 153, 0.15);
        --accent-text: #6ee7b7;
        --danger: #f87171;
        --danger-soft: rgba(248, 113, 113, 0.15);
        --input-bg: #1e293b;
        --input-border: #475569;
        --input-focus: #3b82f6;
        --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);
        --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
        --hero-gradient: linear-gradient(135deg, #3b82f6 0%, #34d399 100%);
        color-scheme: dark;
    }
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--brand);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover { color: var(--brand-hover); }

img { max-width: 100%; height: auto; }

/* ===== Layout ===== */
.container {
    width: min(1120px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===== Header ===== */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition), border-color var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}
.brand a {
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.nav-links a {
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
}
.nav-links a:hover {
    background: var(--surface-hover);
    color: var(--text);
}

/* Theme Toggle */
.theme-toggle {
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.45rem 0.6rem;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    color: var(--text-secondary);
    transition: background var(--transition), border-color var(--transition);
    margin-left: 0.5rem;
}
.theme-toggle:hover {
    background: var(--border);
    color: var(--text);
}

/* Hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text);
}
.hamburger svg { display: block; }

@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 0.5rem 1rem 1rem;
        box-shadow: var(--shadow-md);
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        padding: 0.75rem 1rem;
        width: 100%;
    }
    .theme-toggle {
        margin-left: 0;
        margin-top: 0.5rem;
        width: 100%;
        text-align: center;
    }
}

/* ===== Hero Section ===== */
.hero {
    text-align: center;
    padding: 4rem 1rem 3rem;
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
}
.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1.4;
}
.btn-full {
    width: 100%;
}
.btn-primary {
    background: var(--brand);
    color: #fff;
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}
.btn-primary:hover {
    background: var(--brand-hover);
    color: #fff;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
    transform: translateY(-1px);
}
.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--surface-hover);
    color: var(--text);
    border-color: var(--brand);
}
.btn-accent {
    background: var(--accent);
    color: #fff;
}
.btn-accent:hover {
    filter: brightness(1.1);
    color: #fff;
    transform: translateY(-1px);
}

/* ===== Cards ===== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background-color var(--transition);
}
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--brand);
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--brand); }

.card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.card-preview {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

/* ===== Domain Grid ===== */
.domain-grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    padding: 0 0 3rem;
}

@media (max-width: 700px) {
    .domain-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== DNS Status Badge ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.65rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}
.badge-ok {
    background: var(--accent-soft);
    color: var(--accent-text);
}
.badge-warn {
    background: #fef3c7;
    color: #92400e;
}
[data-theme="dark"] .badge-warn {
    background: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .badge-warn {
        background: rgba(251, 191, 36, 0.15);
        color: #fbbf24;
    }
}
.badge-error {
    background: var(--danger-soft);
    color: var(--danger);
}

/* ===== Tags / Chips ===== */
.tag {
    display: inline-block;
    padding: 0.25rem 0.7rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 500;
    background: var(--brand-soft);
    color: var(--brand-text);
    margin: 0.2rem;
    transition: background var(--transition);
}
.tag:hover {
    background: var(--brand);
    color: #fff;
}

/* ===== Domain Detail Page ===== */
.domain-header {
    padding: 3rem 0 2rem;
}
.domain-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.content-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: background-color var(--transition), border-color var(--transition);
}
.content-section h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}
.content-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--text);
}

/* SEO Tabs */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 1.5rem;
}
.tab {
    padding: 0.65rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: color var(--transition), border-color var(--transition);
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}
.tab:hover { color: var(--text-secondary); }
.tab.active {
    color: var(--brand);
    border-bottom-color: var(--brand);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Related Domains Box */
.related-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: background-color var(--transition), border-color var(--transition);
}
.related-box h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

/* ===== Forms ===== */
.form-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: background-color var(--transition), border-color var(--transition);
}

.form-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr 1fr;
}
@media (max-width: 700px) {
    .form-grid { grid-template-columns: 1fr; }
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.form-group .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

.form-group-full { grid-column: 1 / -1; }
.form-actions {
    display: flex;
    align-items: end;
}

.meta-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Honeypot */
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; }

/* Captcha */
.captcha-row {
    display: flex;
    align-items: end;
    gap: 1rem;
}
.captcha-row .form-group { flex: 1; }

/* ===== Result/Alert Banners ===== */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
}
.alert-success {
    background: var(--accent-soft);
    color: var(--accent-text);
    border-left: 4px solid var(--accent);
}
.alert-error {
    background: var(--danger-soft);
    color: var(--danger);
    border-left: 4px solid var(--danger);
}

/* ===== Legal/Privacy/Terms Pages ===== */
.legal-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin: 2rem 0 3rem;
    box-shadow: var(--shadow-card);
    transition: background-color var(--transition), border-color var(--transition);
    max-width: 800px;
}

.legal-content h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}
.legal-content h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 2rem 0 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}
.legal-content h2:first-of-type {
    border-top: none;
    padding-top: 0;
}
.legal-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.25rem 0 0.5rem;
}
.legal-content p {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.legal-content ul, .legal-content ol {
    margin: 0.5rem 0 1rem 1.5rem;
    color: var(--text-secondary);
}
.legal-content li {
    margin-bottom: 0.35rem;
    line-height: 1.6;
}

.lang-switch {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
    margin-top: 4rem;
    transition: background-color var(--transition), border-color var(--transition);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-info {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.7;
}
.footer-info strong {
    color: var(--text-secondary);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.footer-links a {
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: color var(--transition);
}
.footer-links a:hover { color: var(--brand); }

.footer-copy {
    width: 100%;
    text-align: center;
    padding-top: 1.5rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== Simple Result Page ===== */
.result-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding: 2rem;
}
.result-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 3rem;
    text-align: center;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
}
.result-icon {
    margin-bottom: 1.25rem;
}
.result-icon-success {
    color: #22c55e;
}
.result-icon-error {
    color: #ef4444;
}
.result-card p {
    font-size: 1.15rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 1.75rem;
}

/* ===== Utility ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

.seo-text {
    line-height: 1.75;
    color: var(--text-secondary);
    font-size: 0.95rem;
}
.seo-text h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin: 1.75rem 0 0.75rem;
    letter-spacing: -0.01em;
}
.seo-text h2:first-child { margin-top: 0; }
.seo-text h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin: 1.25rem 0 0.5rem;
}
.seo-text p {
    margin-bottom: 0.85rem;
    line-height: 1.75;
}
.seo-text p:last-child { margin-bottom: 0; }
.seo-text strong {
    color: var(--text);
    font-weight: 600;
}
.seo-text ul, .seo-text ol {
    margin: 0.5rem 0 1rem 1.25rem;
    padding: 0;
}
.seo-text li {
    margin-bottom: 0.4rem;
    line-height: 1.65;
    padding-left: 0.25rem;
}
.seo-text li::marker {
    color: var(--brand);
}
.seo-text a {
    color: var(--brand);
    text-decoration: underline;
    text-decoration-color: var(--brand-soft);
    text-underline-offset: 2px;
    transition: text-decoration-color var(--transition);
}
.seo-text a:hover {
    text-decoration-color: var(--brand);
}

.section-label {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.7rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--brand-soft);
    color: var(--brand-text);
    margin-bottom: 0.75rem;
}

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }