:root{--red:#c91b1f;--red2:#a90f14;--ink:#172033;--muted:#6d7890;--line:#e3e8f0;--bg:#f4f6f9;--card:#fff;--green:#16865b;--gold:#d99416}*{box-sizing:border-box}body{margin:0;font-family:Inter,"Noto Sans Thai","Noto Sans SC",system-ui,sans-serif;color:var(--ink);background:var(--bg)}button,input,select{font:inherit}.hidden{display:none!important}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#747a87aa,#9da1abaa),radial-gradient(circle at 80% 20%,#fff,#aeb3bd)}.login-card{width:min(720px,100%);padding:56px 64px;background:#fff;border:1px solid #d7dde7;border-radius:40px;box-shadow:0 25px 60px #20273745}.logo,.mini-logo{display:grid;place-items:center;background:var(--red);color:#fff;font-weight:900;box-shadow:0 8px 15px #8b0d1633}.logo{width:94px;height:94px;margin:auto;border-radius:28px;font-size:42px}.login-card h1{text-align:center;font-size:40px;margin:24px 0 8px}.login-card h1 span{color:var(--red)}.lead{text-align:center;color:var(--muted);font-size:19px;margin-bottom:34px}.login-card label{display:block;font-weight:800;font-size:18px;margin:20px 0 8px}.login-card input{width:100%;padding:19px 22px;border:2px solid #e0e6ef;border-radius:18px;background:#fafbfc;font-size:18px;outline:none}.login-card input:focus{border-color:#df696c}.password{position:relative}.password button{position:absolute;right:15px;top:12px;border:0;background:none;padding:10px;color:#8ea0bc}.primary{border:0;border-radius:14px;background:linear-gradient(135deg,var(--red),var(--red2));color:#fff;font-weight:900;cursor:pointer}.big{width:100%;padding:19px;margin-top:25px;font-size:20px;box-shadow:0 8px 18px #b1162040}.login-links{border-top:1px solid var(--line);margin-top:34px;padding-top:20px;display:flex;justify-content:space-between}.link{border:0;background:none;color:#66748e;font-weight:700;cursor:pointer}.demo{text-align:center;color:#8793a9;margin-top:28px}.app{min-height:100vh;display:grid;grid-template-columns:280px 1fr}aside{background:#fff;border-right:1px solid var(--line);padding:24px 16px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 24px;border-bottom:1px solid var(--line)}.mini-logo{width:48px;height:48px;border-radius:14px}.brand b{font-size:18px}.brand small,.profile small{display:block;color:var(--muted);margin-top:3px}nav{padding-top:18px;flex:1}nav button{display:flex;align-items:center;gap:12px;width:100%;padding:13px 15px;margin:4px 0;border:0;border-radius:13px;background:none;color:#58647a;font-weight:800;text-align:left;cursor:pointer}nav button.active{background:#fff0f0;color:var(--red)}.profile{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;border-top:1px solid var(--line);padding:18px 7px 0}.avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#ffe8e8;color:var(--red);font-weight:900}.profile button{border:0;background:none;font-size:20px;color:#77839a}main{padding:30px 38px;min-width:0}header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}header h2{font-size:30px;margin:2px 0}.eyebrow{margin:0;color:var(--red);font-weight:900;letter-spacing:1px}.header-actions{display:flex;gap:10px;align-items:center}.status{padding:9px 12px;border-radius:99px;background:#fff2dc;color:#875f0c;font-weight:800}.soft{border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 13px;cursor:pointer}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:0 8px 22px #23304b0a}.hero{background:linear-gradient(130deg,#a90f14,#d72b2e);color:#fff;padding:28px;border-radius:24px;margin-bottom:18px}.hero h3{font-size:28px;margin:0 0 6px}.hero p{opacity:.9;margin:0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}.stat b{font-size:28px;color:var(--red);display:block}.stat span{color:var(--muted)}.level-card{position:relative;overflow:hidden}.level-card:after{content:attr(data-level);position:absolute;right:-8px;bottom:-28px;font-size:100px;font-weight:900;color:#f6e7e7}.level-card h3{font-size:21px;margin:8px 0}.count{color:var(--red);font-size:25px;font-weight:900}.bar{height:9px;border-radius:99px;background:#edf0f4;overflow:hidden;margin:14px 0}.bar i{display:block;height:100%;background:var(--red)}.tag{display:inline-block;padding:5px 9px;border-radius:99px;background:#fff0f0;color:var(--red);font-size:12px;font-weight:900}.toolbar{display:grid;grid-template-columns:1fr auto auto;gap:10px;margin-bottom:15px}.toolbar input,.toolbar select{padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff}.vocab-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}.word h3{font-size:32px;margin:10px 0 0}.pinyin{color:var(--red);font-weight:800}.meaning{color:#556177;min-height:44px}.word-actions{display:flex;gap:6px;margin-top:10px}.word-actions button{border:0;border-radius:10px;padding:8px 10px;cursor:pointer}.exercise{max-width:820px}.question-box{background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px}.question-box h3{font-size:24px;line-height:1.6}.options{display:grid;gap:10px}.option{padding:14px 16px;border:1px solid var(--line);border-radius:13px;background:#fff;text-align:left;cursor:pointer}.option:hover{border-color:#d65d60}.option.correct{background:#eaf9f2;border-color:#46a980}.option.wrong{background:#fff0f1;border-color:#e36268}.sentence-cn{font-size:27px;line-height:1.8}.tokens{display:flex;flex-wrap:wrap;gap:9px;min-height:60px;padding:15px;border:1px dashed #b9c2d1;border-radius:15px}.token{border:1px solid #e0b1b3;background:#fff7f7;border-radius:10px;padding:10px 13px;cursor:pointer}.answer-line{margin:14px 0;padding:15px;min-height:57px;background:#f7f8fa;border-radius:13px}.feedback{margin-top:14px;padding:13px;border-radius:12px;background:#f4f6f9}.reading{font-size:20px;line-height:2;background:#fff8f3;border-left:5px solid var(--red);padding:20px;border-radius:12px}.pager{display:flex;justify-content:space-between;align-items:center;margin-top:16px}.muted{color:var(--muted)}@media(max-width:1000px){.app{grid-template-columns:1fr}aside{position:static;height:auto}.brand,.profile{display:none}nav{display:flex;overflow:auto;padding:0}nav button{min-width:170px}.grid{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}main{padding:20px}}@media(max-width:650px){.login-card{padding:34px 22px;border-radius:28px}.login-card h1{font-size:29px}.grid,.stats{grid-template-columns:1fr}.toolbar{grid-template-columns:1fr}header{align-items:flex-start;gap:12px}.header-actions{flex-direction:column;align-items:flex-end}.login-links{font-size:13px}}