:root {
    --primary: #ff4b4b;
    --primary-hover: #e63e3e;
    --bg: #ffffff;
    --bg-soft: #f6f7f9;
    --text: #262730;
    --text-soft: #5a5d6a;
    --border: #e6e8eb;
    --success: #09ab3b;
    --warning: #faca2b;
    --info: #0068c9;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.nav {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav a {
    color: var(--text-soft);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.15s;
}

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

.nav-brand {
    font-weight: 700;
    color: var(--text);
    font-size: 16px;
}

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

h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.caption {
    color: var(--text-soft);
    font-size: 14px;
    margin-bottom: 24px;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
    border: none;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: transform 0.15s, box-shadow 0.15s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.card ul {
    list-style: none;
    margin: 12px 0 20px;
}

.card li {
    font-size: 14px;
    color: var(--text-soft);
    padding: 4px 0;
}

.card li strong {
    color: var(--text);
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
}

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

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--text-soft);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.15s;
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.15s;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
}

textarea {
    resize: vertical;
    font-family: "SF Mono", Consolas, Monaco, monospace;
    font-size: 13px;
}

.field {
    margin-bottom: 16px;
}

.cols-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 768px) {
    .cols-2 {
        grid-template-columns: 1fr;
    }
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-info {
    background: #e7f3fe;
    color: #0068c9;
    border-left: 3px solid var(--info);
}

.alert-success {
    background: #e6f7ec;
    color: #09ab3b;
    border-left: 3px solid var(--success);
}

.alert-warning {
    background: #fff8e1;
    color: #b07b00;
    border-left: 3px solid var(--warning);
}

.alert-error {
    background: #fdecea;
    color: #c0392b;
    border-left: 3px solid #c0392b;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
    font-size: 13px;
}

th,
td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-soft);
    font-weight: 600;
    color: var(--text-soft);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

tr:hover td {
    background: var(--bg-soft);
}

.table-scroll {
    max-height: 400px;
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.results {
    margin-top: 24px;
}

.kbd {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "SF Mono", Consolas, Monaco, monospace;
    font-size: 12px;
}

.expander {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 8px;
    overflow: hidden;
}

.expander summary {
    padding: 12px 16px;
    cursor: pointer;
    background: var(--bg-soft);
    font-size: 14px;
    user-select: none;
    list-style: none;
}

.expander summary::-webkit-details-marker {
    display: none;
}

.expander summary::before {
    content: "▸";
    display: inline-block;
    margin-right: 8px;
    color: var(--text-soft);
    transition: transform 0.15s;
}

.expander[open] summary::before {
    transform: rotate(90deg);
}

.expander-body {
    padding: 16px;
    background: var(--bg);
}

.expander-body pre {
    background: var(--bg-soft);
    padding: 12px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 13px;
    margin-top: 8px;
}

.footer {
    text-align: center;
    color: var(--text-soft);
    font-size: 13px;
    padding: 32px 0;
    margin-top: 48px;
    border-top: 1px solid var(--border);
}

iframe.fullsize {
    width: 100%;
    height: calc(100vh - 120px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}