:root{--cream:#F9F6F0;--card:#FFFFFF;--line:#E6DFD4;--taupe:#75685A;--ink:#3A342D;--ink-2:#6F665C}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--cream);color:var(--ink);font-family:system-ui,-apple-system,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;font-size:18px;line-height:1.6;word-break:keep-all;overflow-wrap:anywhere}
a{color:var(--taupe)}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;padding-top:max(12px,env(safe-area-inset-top));background:var(--card);border-bottom:1px solid var(--line)}
.top a.brand{font-weight:700;text-decoration:none;color:var(--ink);font-size:19px}
.env{font-size:13px;font-weight:700;color:var(--card);background:var(--ink);padding:4px 10px;border-radius:999px;white-space:nowrap}
main{max-width:640px;margin:0 auto;padding:20px 16px calc(40px + env(safe-area-inset-bottom))}
h1{font-size:26px;line-height:1.35;margin:8px 0 18px}
h2{font-size:21px;margin:28px 0 12px}
p{margin:0 0 14px}
.muted{color:var(--ink-2);font-size:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:18px;margin-bottom:14px}
label{display:block;font-weight:700;margin:16px 0 6px}
input,select,textarea{width:100%;min-height:56px;font-size:18px;padding:12px 14px;border:1.5px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font-family:inherit}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--taupe);box-shadow:0 0 0 3px rgba(117,104,90,.18)}
input.code{font-size:30px;letter-spacing:.35em;text-align:center;font-variant-numeric:tabular-nums}
.hint{font-size:15px;color:var(--ink-2);margin-top:6px}
.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:58px;margin-top:18px;padding:12px 18px;border-radius:8px;border:1.5px solid var(--taupe);background:var(--taupe);color:#fff;font-size:19px;font-weight:700;text-decoration:none;cursor:pointer;font-family:inherit}
.btn.ghost{background:var(--card);color:var(--taupe)}
.btn.small{min-height:48px;font-size:17px;margin-top:10px}
.btn:active{transform:scale(.99)}
.row{display:flex;gap:10px}.row>*{flex:1}
.msg{padding:14px 16px;border-radius:8px;margin-bottom:16px;border:1.5px solid var(--ink);background:var(--card);font-weight:600}
.msg.err{border-style:dashed}
.msg.err::before{content:"⚠ ";}
.practice{padding:14px 16px;border-radius:8px;margin:0 0 16px;background:var(--ink);color:var(--card)}
.practice b{font-size:26px;letter-spacing:.2em;display:block;margin-top:4px}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.tile{display:flex;flex-direction:column;justify-content:center;min-height:110px;padding:16px;border-radius:8px;background:var(--card);border:1.5px solid var(--line);text-decoration:none;color:var(--ink);font-weight:700;font-size:19px}
.tile small{display:block;font-weight:400;font-size:14px;color:var(--ink-2);margin-top:4px}
.tile.off{opacity:.55}
.list{list-style:none;padding:0;margin:0}
.list li{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px;margin-bottom:10px}
.badge{display:inline-block;font-size:14px;font-weight:700;padding:2px 10px;border-radius:999px;border:1.5px solid var(--taupe);color:var(--taupe);margin-right:6px}
.badge.solid{background:var(--taupe);color:#fff}
table{width:100%;border-collapse:collapse;font-size:15px;background:var(--card)}
td,th{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
.u-name{margin:8px 0 0}.u-sub{margin:0}
.brand-logo{display:block;width:120px;height:auto;margin:6px 0 4px}
.center{text-align:center;margin-top:18px}
details summary{cursor:pointer;font-weight:700;min-height:44px;display:flex;align-items:center}