/* 基础 */
:root{--ink:#0b1f24;--ink2:#123a3a;--mint:#2dd4bf;--paper:#f7f9f9;--line:#e3e8e8;--t:#1b2426;--t2:#7b8a8c}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{font:16px/1.7 -apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--t);background:var(--paper)}

/* ============ Coming Soon 页 ============ */
body.soon{background:var(--ink);background-image:radial-gradient(circle at 50% 42%,var(--ink2) 0%,var(--ink) 64%);color:#fff}
.soon-wrap{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;padding:24px}
.s-back{align-self:flex-start;color:rgba(255,255,255,.42);text-decoration:none;font-size:13px;letter-spacing:.06em;transition:color .2s}
.s-back:active{color:#fff}
.s-mid{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding-bottom:44px}
.s-no{font-size:12px;letter-spacing:.42em;color:rgba(255,255,255,.34);margin-bottom:26px}
.s-line{width:36px;height:1px;background:var(--mint);margin:0 auto 30px;opacity:.85}
.s-title{margin:0;font-size:clamp(30px,8.2vw,64px);font-weight:400;letter-spacing:.02em;line-height:1.15;color:#fff}
.s-sub{margin:22px 0 0;font-size:14px;letter-spacing:.24em;color:rgba(255,255,255,.5);text-indent:.24em}

/* ============ 目录页 ============ */
.idx{max-width:680px;margin:0 auto;background:#fff;min-height:100vh;padding-bottom:10px}
.idx-hd{padding:26px 22px 18px;border-bottom:1px solid var(--line)}
.idx-hd h1{margin:0 0 6px;font-size:19px;font-weight:600;letter-spacing:.02em}
.idx-hd .m{font-size:12px;color:var(--t2)}
.tip{margin:16px 22px;padding:11px 13px;background:#effaf8;border-left:3px solid var(--mint);border-radius:0 4px 4px 0;font-size:13px;color:#2f5b57;line-height:1.75}
.nav{list-style:none;margin:0;padding:0 22px}
.nav li{border-bottom:1px solid #f0f3f3}
.nav a{display:flex;align-items:center;gap:14px;padding:15px 2px;text-decoration:none;color:var(--t);transition:background .15s}
.nav a:active{background:#f7fbfa}
.nav .no{font-size:12px;letter-spacing:.1em;color:var(--mint);width:22px;flex:0 0 22px;font-weight:600}
.nav .tt{flex:1;font-size:15px}