:root {
    --bg: #f6f8fb;
    --bg-elev: #ffffff;
    --line: #e3e8ef;
    --line-strong: #c8d1dc;
    --text: #0f1a26;
    --text-soft: #5e6c7a;
    --text-mute: #94a3b3;
    --accent: #0052D9;
    --accent-soft: #e8f0ff;
    --accent-fade: rgba(0, 82, 217, 0.08);
    --accent-2: #7c3aed;
    --code-bg: #f1f4f8;
    --success: #16a34a;
    --warn: #f59e0b;
    --shadow-sm: 0 1px 2px rgba(15, 26, 38, .04), 0 1px 3px rgba(15, 26, 38, .06);
    --shadow-md: 0 4px 12px rgba(15, 26, 38, .06), 0 2px 4px rgba(15, 26, 38, .04);
    --font-body: "Lexend Deca", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0a0e14;
        --bg-elev: #131922;
        --line: #1f2731;
        --line-strong: #2e3947;
        --text: #e6ecf2;
        --text-soft: #9aa6b3;
        --text-mute: #5c6878;
        --accent: #5b8def;
        --accent-soft: #1a2436;
        --accent-fade: rgba(91, 141, 239, 0.1);
        --accent-2: #a78bfa;
        --code-bg: #171e28;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, .35);
    }
}
* { box-sizing: border-box; }
html, body { background: var(--bg); color: var(--text); font-family: var(--font-body); margin: 0; padding: 0; line-height: 1.6; font-size: 15px; -webkit-font-smoothing: antialiased; }
.container { max-width: 960px; margin: 0 auto; padding: 0 1.5rem; }

/* ============ Hero ============ */
.hero {
    position: relative;
    padding: 4rem 0 3rem;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 30%, var(--accent-fade) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(124, 58, 237, 0.06) 0%, transparent 40%);
    pointer-events: none;
    z-index: -1;
}
.hero .container { display: flex; align-items: flex-start; gap: 2rem; flex-wrap: wrap; }
.hero-text { flex: 1; min-width: 280px; }
.hero-logo {
    flex-shrink: 0;
    width: 180px;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
}
.hero-logo svg { width: 100%; height: 100%; filter: drop-shadow(0 8px 24px rgba(0, 82, 217, .25)); }
@media (max-width: 720px) {
    .hero-logo { width: 120px; height: 120px; margin: 0 auto; }
}
.hero .badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .3rem .75rem;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 99px;
    font-size: .8rem;
    font-weight: 500;
    margin-bottom: 1rem;
}
.hero h1 {
    margin: 0 0 .75rem;
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -.02em;
    line-height: 1.15;
}
.hero h1 .gradient {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero .lede { color: var(--text-soft); font-size: 1.1rem; margin: 0 0 2rem; max-width: 640px; }
.hero .feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: .75rem;
    margin-top: 1.5rem;
}
.hero .feature-pill {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .65rem 1rem;
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 8px;
    font-size: .88rem;
    color: var(--text-soft);
    box-shadow: var(--shadow-sm);
}
.hero .feature-pill i {
    color: var(--accent);
    font-size: 1rem;
    width: 1.25rem;
    text-align: center;
}

/* ============ Sections ============ */
section.block { padding: 2.5rem 0; }
section.block + section.block { border-top: 1px solid var(--line); }
.section-title {
    display: flex;
    align-items: center;
    gap: .65rem;
    margin: 0 0 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -.01em;
}
.section-title i {
    color: var(--accent);
    font-size: 1.25rem;
}
.section-title .num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 8px;
    font-size: .9rem;
    font-weight: 600;
}
.section-lede { color: var(--text-soft); margin-bottom: 1.5rem; font-size: .95rem; max-width: 720px; }

h3 { font-size: 1.05rem; margin: 1.5rem 0 .75rem; font-weight: 600; display: flex; align-items: center; gap: .5rem; }
h3 i { color: var(--text-mute); font-size: .95rem; }

p { margin: 0 0 1rem; }
p code, li code, td code, .code { font-family: var(--font-mono); background: var(--code-bg); padding: .12rem .4rem; border-radius: 4px; font-size: .85em; color: var(--accent); }

/* ============ Code blocks ============ */
.code-block {
    display: flex;
    align-items: center;
    gap: .5rem;
    margin: .75rem 0 1rem;
    padding: .75rem 1rem;
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 8px;
    transition: border-color .15s;
}
.code-block:hover { border-color: var(--line-strong); }
.code-block pre {
    flex: 1;
    margin: 0;
    font-family: var(--font-mono);
    font-size: .85rem;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.55;
    color: var(--text);
}
.code-copy-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-mute);
    cursor: pointer;
    padding: .35rem .55rem;
    border-radius: 5px;
    font-size: .9rem;
    transition: all .15s;
    flex-shrink: 0;
}
.code-copy-btn:hover { background: var(--accent-fade); color: var(--accent); border-color: var(--accent-soft); }
.code-copy-btn.copied { color: var(--success); }

/* ============ Cards (ID 类型) ============ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1rem 0 1.5rem;
}
.card {
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    transition: transform .15s, box-shadow .15s, border-color .15s;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--line-strong); }
.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 8px;
    font-size: 1.1rem;
    margin-bottom: .75rem;
}
.card-title { font-size: 1rem; font-weight: 600; margin: 0 0 .35rem; }
.card-desc { font-size: .87rem; color: var(--text-soft); margin: 0 0 .75rem; line-height: 1.5; }
.card-example { font-family: var(--font-mono); font-size: .8rem; color: var(--text-mute); word-break: break-all; }

/* ============ Tables ============ */
table { width: 100%; border-collapse: separate; border-spacing: 0; margin: 1rem 0 1.5rem; font-size: .9rem; background: var(--bg-elev); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-sm); }
th, td { padding: .65rem 1rem; border-bottom: 1px solid var(--line); text-align: left; }
th { background: var(--code-bg); font-weight: 600; font-size: .85rem; color: var(--text-soft); }
tr:last-child td { border-bottom: none; }

/* ============ Demo ============ */
.demo {
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0 1.5rem;
    box-shadow: var(--shadow-sm);
}
.demo-tabs {
    display: flex;
    gap: .25rem;
    margin-bottom: 1.25rem;
    background: var(--code-bg);
    border-radius: 8px;
    padding: .25rem;
}
.demo-tab {
    flex: 1;
    background: transparent;
    border: none;
    padding: .55rem 1rem;
    cursor: pointer;
    border-radius: 6px;
    font-size: .9rem;
    font-weight: 500;
    color: var(--text-soft);
    font-family: inherit;
    transition: all .15s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
}
.demo-tab.active { background: var(--bg-elev); color: var(--accent); box-shadow: var(--shadow-sm); }
.demo-tab i { font-size: .85rem; }

.demo-input-row {
    display: flex;
    gap: .5rem;
    align-items: stretch;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.demo-input-wrap {
    flex: 1;
    min-width: 240px;
    position: relative;
}
.demo-input-wrap i.icon-prefix {
    position: absolute;
    left: .85rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-mute);
    font-size: .9rem;
    pointer-events: none;
}
.demo-input-wrap input {
    width: 100%;
    padding: .65rem .85rem .65rem 2.4rem;
    border: 1px solid var(--line-strong);
    border-radius: 7px;
    font-family: var(--font-mono);
    font-size: .9rem;
    background: var(--bg-elev);
    color: var(--text);
    transition: border-color .15s, box-shadow .15s;
}
.demo-input-wrap input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-fade);
}
.demo-select {
    padding: .65rem .85rem;
    border: 1px solid var(--line-strong);
    border-radius: 7px;
    background: var(--bg-elev);
    color: var(--text);
    font-family: inherit;
    font-size: .9rem;
    cursor: pointer;
}
.demo-select:focus { outline: none; border-color: var(--accent); }

.demo-result {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    padding: 1.25rem;
    background: var(--code-bg);
    border-radius: 8px;
}
.demo-result img {
    width: 112px;
    height: 112px;
    border-radius: 12px;
    border: 1px solid var(--line);
    object-fit: cover;
    background: var(--bg-elev);
    flex-shrink: 0;
}
.demo-info { flex: 1; min-width: 0; }
.demo-info-row { display: flex; gap: .75rem; margin-bottom: .55rem; align-items: baseline; font-size: .88rem; }
.demo-info-row .key { color: var(--text-mute); min-width: 4.5rem; flex-shrink: 0; }
.demo-info-row .val { font-family: var(--font-mono); color: var(--text); font-size: .82rem; word-break: break-all; }
.demo-info-row .val a { color: var(--accent); text-decoration: none; }
.demo-info-row .val a:hover { text-decoration: underline; }
.source-badge {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .2rem .6rem;
    border-radius: 99px;
    font-size: .75rem;
    font-weight: 500;
    background: var(--accent-soft);
    color: var(--accent);
    font-family: var(--font-mono);
}
.source-badge.is-default { background: rgba(245, 158, 11, .1); color: var(--warn); }
.is-hidden { display: none !important; }
.info-key-icon { margin-right: .3rem; }
.cache-status-icon { margin-right: .4rem; }
.cache-status-icon.is-success { color: var(--success); }
.cache-status-icon.is-warn { color: var(--warn); }
.num.is-question {
    background: var(--accent-soft);
    color: var(--accent);
}

/* ============ Callout ============ */
.callout {
    background: var(--accent-fade);
    border-left: 3px solid var(--accent);
    padding: .85rem 1.1rem;
    margin: 1rem 0;
    border-radius: 0 6px 6px 0;
    font-size: .9rem;
    display: flex;
    align-items: flex-start;
    gap: .65rem;
}
.callout i { color: var(--accent); flex-shrink: 0; margin-top: .15rem; }

/* ============ FAQ ============ */
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item {
    border-bottom: 1px solid var(--line);
    padding: 1.25rem 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-q {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 .75rem 0;
    display: flex;
    align-items: flex-start;
    gap: .6rem;
    line-height: 1.4;
}
.faq-q::before {
    content: "Q";
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 6px;
    background: var(--accent);
    color: #fff;
    font-size: .75rem;
    font-weight: 700;
    margin-top: .1rem;
}
.faq-a { padding-left: 1.85rem; }
.faq-a p { margin: 0 0 .6rem; color: var(--text-soft); font-size: .93rem; line-height: 1.7; }
.faq-a p:last-child { margin-bottom: 0; }
.faq-a .code-block { margin: .5rem 0; }

/* ============ Footer ============ */
footer.site-footer {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--line);
    color: var(--text-soft);
    font-size: .85rem;
    text-align: center;
}
footer.site-footer a { color: var(--accent); text-decoration: none; }
footer.site-footer a:hover { text-decoration: underline; }
footer.site-footer i { margin: 0 .25rem; }
.footer-dot {
    font-size: .3rem;
    vertical-align: middle;
    color: var(--text-mute);
}
.footer-stats { margin-top: .5rem; }
.footer-stats-icon {
    color: var(--accent);
    margin-right: .35rem;
}
#req-count { color: var(--text); }

@media (max-width: 600px) {
    .hero { padding: 2.5rem 0 2rem; }
    .hero h1 { font-size: 1.8rem; }
    .hero .lede { font-size: .95rem; }
    .section-title { font-size: 1.2rem; }
    .demo-result { flex-direction: column; align-items: center; text-align: center; }
    .demo-info { width: 100%; }
    .demo-info-row { flex-direction: column; gap: .15rem; align-items: stretch; }
}