:root {
    --bg: #f6f7f9;
    --card: #ffffff;
    --text: #1d1d1f;
    --muted: #5f6368;
    --line: #e3e5e8;
    --accent: #0a84ff;
    --down: #0a84ff;
    --up: #ff9f0a;
    --ok-bg: #e8f5e9;
    --ok-line: #34c759;
    --ok-text: #1e6b34;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111214;
        --card: #1c1d20;
        --text: #f2f2f4;
        --muted: #a1a4aa;
        --line: #2c2e33;
        --accent: #409cff;
        --ok-bg: #16281b;
        --ok-line: #30d158;
        --ok-text: #8ee3a4;
    }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans", sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.nav {
    max-width: 960px;
    margin: 0 auto;
    padding: 18px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.nav .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text); }
.nav .brand img { width: 32px; height: 32px; }
.nav .links { display: flex; gap: 18px; margin-left: auto; font-size: 14px; }
.nav .links a { color: var(--muted); }
.nav .links a.on { color: var(--text); font-weight: 600; }
.lang { display: flex; gap: 4px; }
.lang button {
    border: 0;
    background: transparent;
    color: var(--muted);
    font: inherit;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 14px;
    cursor: pointer;
}
.lang button.on { background: var(--accent); color: #fff; }

.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
.wide { max-width: 960px; }

.hero { text-align: center; padding: 40px 0 32px; }
.hero img.icon { width: 112px; height: 112px; margin: 0 auto 20px; }
.hero h1 { font-size: 40px; line-height: 1.2; font-weight: 700; letter-spacing: -0.5px; }
.hero p.sub { font-size: 19px; color: var(--muted); margin: 14px auto 28px; max-width: 600px; }
.btn {
    display: inline-block;
    background: var(--text);
    color: var(--bg);
    padding: 12px 26px;
    border-radius: 12px;
    font-weight: 600;
}
.btn:hover { text-decoration: none; opacity: 0.88; }
.hero small { display: block; margin-top: 12px; color: var(--muted); font-size: 13px; }

.shot { margin: 28px 0; border-radius: 14px; overflow: hidden; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 32px 0; }
.feat { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.feat h3 { font-size: 16px; margin-bottom: 6px; }
.feat p { font-size: 14px; color: var(--muted); }
.tag { display: inline-block; font-size: 11px; font-weight: 700; color: var(--accent); letter-spacing: 0.5px; margin-bottom: 6px; }

h2.section { font-size: 26px; text-align: center; margin: 48px 0 8px; }
p.section { text-align: center; color: var(--muted); }

.page-title { padding: 24px 0 8px; }
.page-title h1 { font-size: 30px; }
.page-title p { color: var(--muted); font-size: 14px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 26px; margin: 18px 0; }
.card h2 { font-size: 18px; margin-bottom: 10px; }
.card p, .card li { font-size: 15px; color: var(--muted); }
.card p + p { margin-top: 10px; }
.card ul, .card ol { padding-left: 20px; margin-top: 8px; }
.card li { margin-bottom: 6px; }
.card strong { color: var(--text); }
.highlight { background: var(--ok-bg); border-left: 4px solid var(--ok-line); padding: 14px 18px; border-radius: 0 10px 10px 0; margin-top: 14px; }
.highlight p { color: var(--ok-text); font-weight: 500; }
.mail { font-size: 20px; font-weight: 600; }

footer { text-align: center; padding: 32px 16px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
footer a { color: var(--muted); margin: 0 8px; }

/* 只显示当前语言; !important 以压过 .hero small 等带 display 的规则 */
html[data-lang="en"] [data-l]:not([data-l="en"]),
html[data-lang="zh"] [data-l]:not([data-l="zh"]),
html[data-lang="ja"] [data-l]:not([data-l="ja"]) { display: none !important; }

@media (max-width: 560px) {
    .hero h1 { font-size: 30px; }
    .hero p.sub { font-size: 17px; }
    .nav .links { margin-left: 0; width: 100%; }
}