:root {
    --bg-grad-1: #667eea;
    --bg-grad-2: #764ba2;
    --card-bg: #ffffff;
    --card-shadow: 0 10px 40px rgba(0,0,0,0.15);
    --text: #2c3e50;
    --text-muted: #7f8c8d;
    --text-subtle: #95a5a6;
    --border: #f0f0f5;
    --input-border: #e1e5ee;
    --accent: #667eea;
    --accent-hover: #5568d3;
    --pre-bg: #1e1e2e;
    --pre-text: #c9d1d9;
    --tag-bg: #f0f0f5;
    --header-text: #ffffff;
    --footer-text: rgba(255,255,255,0.85);
    --available-bg: #e8f8f0;
    --available-border: #27ae60;
    --taken-bg: #fff0f0;
    --taken-border: #e74c3c;
    --unknown-bg: #f5f5f5;
    --unknown-border: #95a5a6;
}

[data-theme="dark"] {
    --bg-grad-1: #1a1a2e;
    --bg-grad-2: #16213e;
    --card-bg: #242438;
    --card-shadow: 0 10px 40px rgba(0,0,0,0.4);
    --text: #e4e6eb;
    --text-muted: #a8a9ad;
    --text-subtle: #7d7e82;
    --border: #333348;
    --input-border: #3a3a50;
    --accent: #818cf8;
    --accent-hover: #6b77e8;
    --pre-bg: #0d0d1a;
    --pre-text: #c9d1d9;
    --tag-bg: #333348;
    --header-text: #e4e6eb;
    --footer-text: rgba(228,230,235,0.7);
    --available-bg: #1a3327;
    --available-border: #27ae60;
    --taken-bg: #33201f;
    --taken-border: #e74c3c;
    --unknown-bg: #2a2a3c;
    --unknown-border: #7d7e82;
}

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

body {
    font-family: -apple-system, "Segoe UI", "Sarabun", "Noto Sans Thai", sans-serif;
    background: linear-gradient(135deg, var(--bg-grad-1) 0%, var(--bg-grad-2) 100%);
    min-height: 100vh;
    color: var(--text);
    padding: 20px;
    line-height: 1.6;
    transition: background 0.3s;
}

.container {
    max-width: 820px;
    margin: 0 auto;
    position: relative;
}

#theme-toggle {
    position: absolute;
    top: 15px;
    right: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background 0.2s;
    z-index: 10;
}
#theme-toggle:hover { background: rgba(255,255,255,0.35); }

header {
    text-align: center;
    color: var(--header-text);
    padding: 40px 0 30px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}
h1 a { color: inherit; text-decoration: none; }

.subtitle {
    opacity: 0.9;
    margin-top: 8px;
    font-size: 0.95rem;
}

.search-form {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    gap: 10px;
    box-shadow: var(--card-shadow);
    margin-bottom: 20px;
}

.search-form input {
    flex: 1;
    padding: 14px 18px;
    font-size: 1rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
    background: var(--card-bg);
    color: var(--text);
}
.search-form input:focus { border-color: var(--accent); }

.search-form button {
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    font-family: inherit;
}
.search-form button:hover { background: var(--accent-hover); }

/* Search history */
.history-box {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 14px 18px;
    margin-bottom: 20px;
    box-shadow: var(--card-shadow);
}
.hist-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.hist-clear {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 2px 8px;
    font-family: inherit;
}
.hist-clear:hover { text-decoration: underline; }
.hist-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.hist-item {
    background: var(--tag-bg);
    color: var(--text);
    text-decoration: none;
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 0.85rem;
    transition: background 0.2s;
}
.hist-item:hover { background: var(--accent); color: #fff; }

.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    background: var(--card-bg);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    color: var(--text);
}
.alert.error { border-left: 4px solid #e74c3c; color: #c0392b; }
.alert.success {
    border-left: 4px solid #27ae60;
    color: #1e8449;
    font-size: 1.1rem;
}
[data-theme="dark"] .alert.error { color: #ff6b6b; }
[data-theme="dark"] .alert.success { color: #4ade80; }

.result-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 26px 30px;
    box-shadow: var(--card-shadow);
    margin-bottom: 20px;
    color: var(--text);
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
}

.result-card h2 {
    font-size: 1.6rem;
    color: var(--text);
    word-break: break-all;
}

.result-card h3 {
    font-size: 1.15rem;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}

.cache-tag {
    font-size: 0.75rem;
    background: var(--tag-bg);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 12px;
    white-space: nowrap;
}

.idn-ascii {
    font-size: 0.85rem;
    color: var(--text-subtle);
    margin-top: 4px;
    word-break: break-all;
}

.expiry-box {
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 20px;
    color: #fff;
}
.expiry-box .expiry-days {
    font-size: 1.4rem;
    font-weight: 700;
}
.expiry-box .expiry-date {
    opacity: 0.95;
    font-size: 0.9rem;
    margin-top: 2px;
}
.expiry-ok       { background: linear-gradient(135deg, #27ae60, #2ecc71); }
.expiry-warning  { background: linear-gradient(135deg, #f39c12, #e67e22); }
.expiry-critical { background: linear-gradient(135deg, #e74c3c, #c0392b); }

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

.result-card th,
.result-card td {
    text-align: left;
    padding: 11px 8px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    word-break: break-word;
}

.result-card tr:last-child th,
.result-card tr:last-child td {
    border-bottom: none;
}

.result-card th {
    width: 150px;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.88rem;
}

.result-card td { color: var(--text); }

.dns-table th {
    width: 80px;
    font-weight: 600;
    color: var(--accent);
    font-family: "Consolas", "Monaco", monospace;
}

.mono {
    font-family: "Consolas", "Monaco", "Courier New", monospace;
    font-size: 0.9rem;
}

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

.raw-toggle {
    margin-top: 20px;
    border-top: 2px solid var(--border);
    padding-top: 16px;
}

.raw-toggle summary {
    cursor: pointer;
    color: var(--accent);
    font-weight: 500;
    padding: 8px 0;
    user-select: none;
}
.raw-toggle summary:hover { color: var(--accent-hover); }

.raw-toggle pre {
    background: var(--pre-bg);
    color: var(--pre-text);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 0.85rem;
    margin-top: 10px;
    max-height: 400px;
    overflow-y: auto;
    line-height: 1.55;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Related TLD grid */
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
}
.related-item {
    padding: 12px 14px;
    border-radius: 8px;
    border-left: 4px solid;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}
.related-item.available {
    background: var(--available-bg);
    border-left-color: var(--available-border);
}
.related-item.taken {
    background: var(--taken-bg);
    border-left-color: var(--taken-border);
}
.related-item.unknown {
    background: var(--unknown-bg);
    border-left-color: var(--unknown-border);
}
.related-domain {
    font-size: 0.9rem;
    word-break: break-all;
    color: var(--text);
}
.related-status {
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}
.related-item.available .related-status { color: var(--available-border); }
.related-item.taken .related-status { color: var(--taken-border); }
.related-item.unknown .related-status { color: var(--text-subtle); }
.related-item a {
    color: inherit;
    text-decoration: none;
}
.related-item a:hover .related-domain { text-decoration: underline; }

/* Affiliate CTA */
.affiliate-box {
    background: linear-gradient(135deg, #667eea22, #764ba222);
    border-radius: 10px;
    padding: 16px 20px;
    margin-top: 16px;
    text-align: center;
}
.affiliate-box .aff-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}
.aff-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.aff-link {
    padding: 8px 16px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    transition: transform 0.1s, background 0.2s;
}
.aff-link:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.copy-flash {
    color: #27ae60;
    font-size: 0.75rem;
    margin-left: 8px;
    font-weight: 600;
}

.intro ul {
    list-style: none;
    padding: 0;
}
.intro ul li {
    padding: 8px 0 8px 24px;
    position: relative;
    color: var(--text-muted);
}
.intro ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: 700;
}
.intro p { margin: 10px 0; color: var(--text-muted); }

footer {
    text-align: center;
    color: var(--footer-text);
    padding: 30px 0;
    font-size: 0.85rem;
}

@media (max-width: 600px) {
    body { padding: 10px; }
    .search-form { flex-direction: column; padding: 15px; }
    .result-card { padding: 20px; }
    .result-card th { width: 100px; font-size: 0.78rem; }
    .dns-table th { width: 60px; }
    h1 { font-size: 1.9rem; }
    .subtitle { font-size: 0.85rem; }
    header { padding: 20px 0 15px; }
    .expiry-box .expiry-days { font-size: 1.2rem; }
    #theme-toggle { top: 10px; right: 10px; }
    .related-grid { grid-template-columns: 1fr 1fr; }
}