:root{color-scheme:light;--ink:#242b29;--muted:#737b77;--line:#e4e8e5;--green:#346354;--wash:#f3f6f4}*{box-sizing:border-box}body{margin:0;background:#fcfdfc;color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;font-weight:500;line-height:1.65}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,summary,label.import{touch-action:manipulation}button{cursor:pointer;background:white;border:1px solid var(--line);border-radius:8px;padding:11px 23px;color:var(--ink);font-weight:650}button:hover{background:var(--wash);border-color:#b9c9c0}button:disabled{opacity:.5;cursor:default}:focus-visible{outline:2px solid var(--green);outline-offset:5px}.header{max-width:1180px;margin:auto;display:flex;align-items:center;gap:48px;padding:30px 32px;border-bottom:1px solid var(--line)}.brand{font-size:23px;font-weight:750;white-space:nowrap}nav{display:flex;gap:30px}nav a{color:var(--muted);padding:9px 0;border-bottom:2px solid transparent;font-weight:650}nav a[aria-current]{color:var(--ink);border-color:var(--green)}.outside{margin-left:auto;display:flex;gap:20px;font-size:13px;color:var(--muted)}main{max-width:920px;min-height:65vh;margin:auto;padding:60px 32px 35px}h1{font-size:36px;font-weight:750;letter-spacing:-1px;margin:8px 0 10px}h2{font-size:20px;font-weight:700}p{margin:10px 0}.eyebrow{color:var(--muted);font-size:12px;font-weight:700;letter-spacing:2px}.muted{color:var(--muted);font-weight:500}.intro{margin-bottom:32px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:30px 0}.metric{border-left:1px solid var(--line);padding-left:22px;color:var(--muted)}.metric:first-child{border:0;padding-left:0}.metric strong{display:block;font-size:38px;font-weight:700;color:var(--ink)}.primary{background:var(--ink);border-color:var(--ink);color:white}.primary:hover{background:var(--green);color:white}.action-row{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin:28px 0}.progress-line{height:4px;background:var(--line);border-radius:8px;overflow:hidden;margin:15px 0}.progress-line span{display:block;height:100%;background:var(--green)}.books{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0}.book{padding:24px;border:1px solid var(--line);border-radius:12px}.book h2{margin:0 0 15px}.book p{font-size:13px;color:var(--muted)}.book a{display:inline-block;margin-top:14px;color:var(--green)}.session-meta{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}.word-area{text-align:center;padding:60px 0 28px}.term{font-size:clamp(35px,6vw,64px);font-weight:750;line-height:1.2;letter-spacing:-1.5px;overflow-wrap:anywhere;margin:12px 0}.ipa{font-family:Georgia,serif;font-size:19px;color:var(--muted);font-weight:600}.choices{display:flex;justify-content:center;gap:12px;margin-top:45px}.choices button{min-width:115px}.answer{max-width:630px;margin:25px auto 0;padding-top:25px;border-top:1px solid var(--line);text-align:left}.meaning{font-size:20px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}details{margin:20px 0;color:var(--muted)}summary{cursor:pointer}details p{font-size:14px;white-space:pre-wrap}select{padding:7px 12px;border:1px solid var(--line);border-radius:6px;background:white}footer{max-width:920px;margin:30px auto;padding:24px 32px;color:var(--muted);font-size:12px;border-top:1px solid var(--line);display:flex;align-items:center;gap:12px;flex-wrap:wrap}.text-btn{padding:0;border:0;background:none;color:var(--muted);font-size:12px}.import{cursor:pointer}.import input{position:absolute;width:1px;height:1px;overflow:hidden;opacity:0}#notice{max-width:856px;margin:0 auto;color:#9a422a;padding:0 16px}.word-list{padding:0;list-style:none}.word-list li{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding:16px 0}.word-list strong{font-weight:700}.word-list small{display:block;color:var(--muted)}.tag{font-size:12px;color:var(--green);white-space:nowrap}.empty{padding:60px 0;text-align:center}.inline-link{color:var(--green);text-decoration:underline}.status-grid{display:flex;gap:20px;flex-wrap:wrap}.status-grid span{font-size:13px;color:var(--muted)}@media(max-width:650px){.header{padding:20px;gap:15px;flex-wrap:wrap}.brand{font-size:20px}.outside{font-size:12px}nav{order:3;width:100%;justify-content:space-between;gap:15px}main{padding:32px 22px;min-height:60vh}h1{font-size:29px}.books{grid-template-columns:1fr}.metric{padding-left:12px}.metric strong{font-size:30px}.metrics{gap:10px}.word-area{padding-top:45px}.choices{gap:8px}.choices button{min-width:0;flex:1;padding:12px 8px}.meaning{font-size:18px}footer{padding:20px 22px}.word-list li{gap:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}