/* Steproll website — single column, mobile-first. Structure follows the ColorWander site. */
:root{--bg:#F3F3F1;--card:#FFFFFF;--ink:#16171A;--secondary:#6B6F76;--rule:#E3E3E0;--accent:#C8F031;--max-width:720px}
@media (prefers-color-scheme:dark){:root{--bg:#000;--card:#1C1C1E;--ink:#F2F2F7;--secondary:#8E8E93;--rule:#2C2C2E}}
*{box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Segoe UI",Helvetica,Arial,sans-serif;font-size:16px;line-height:1.65;color:var(--ink);background:var(--bg);margin:0;padding:32px 20px 80px;-webkit-font-smoothing:antialiased}
main{max-width:var(--max-width);margin:0 auto}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:36px}
.brand{font-weight:800;font-size:20px;letter-spacing:.14em;color:var(--ink);text-decoration:none;display:inline-flex;align-items:center;gap:10px}
.brand-icon{width:32px;height:32px;border-radius:7px;display:block}
.brand .zh{font-size:13px;font-weight:500;letter-spacing:.05em;color:var(--secondary)}
.lang-switch{display:inline-flex;align-items:center;gap:2px;flex-shrink:0;font-size:13px}
.lang-switch a,.lang-switch span{padding:4px 9px;border-radius:6px;text-decoration:none;color:var(--secondary);white-space:nowrap}
.lang-switch a:hover{color:var(--ink)}
.lang-switch .active{color:var(--ink);background:rgba(127,127,127,.16);font-weight:600}
h1{font-size:32px;font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:0 0 8px}
h2{font-size:20px;font-weight:700;margin:48px 0 12px}
h3{font-size:15px;font-weight:600;margin:24px 0 8px}
.meta{color:var(--secondary);font-size:13px;margin-bottom:28px}
.lead{font-size:18px;color:var(--secondary);margin:12px 0 28px}
a{color:var(--ink);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
ul,ol{padding-left:22px}
mark{background:linear-gradient(transparent 15%,var(--accent) 15% 85%,transparent 85%);color:#16171A;padding:0 2px}
table{border-collapse:collapse;width:100%;margin:1rem 0;font-size:.95em;background:var(--card);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
th,td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--rule);vertical-align:top}
tr:last-child td{border-bottom:0}
th{font-weight:600}
footer{margin-top:64px;padding-top:20px;border-top:1px solid var(--rule);display:flex;flex-wrap:wrap;gap:18px;font-size:13px}
footer a{color:var(--secondary)}
@media (max-width:380px){.brand{font-size:17px}.brand .zh{font-size:11px}}