:root{--ink:#18201d;--ink-2:#303936;--muted:#69716e;--paper:#f4f1e9;--paper-2:#ebe6da;--white:#fffdf8;--red:#b33a2d;--red-dark:#8e2c22;--green:#315e50;--line:#d8d2c6;--line-dark:#b8b0a2;--radius:4px;--shadow:0 18px 55px rgba(38,31,20,.11)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:"DM Sans",system-ui,sans-serif;line-height:1.65}body:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.12;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.16'/%3E%3C/svg%3E")}a{color:inherit;text-decoration:none}button,input{font:inherit}.site-header{max-width:1240px;height:82px;margin:auto;padding:0 32px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:38px;height:38px;color:var(--white);background:var(--red);font:700 23px "Noto Sans SC"}.site-header nav{display:flex;gap:34px;color:var(--muted);font-size:13px}.site-header nav a{padding:8px 0;border-bottom:1px solid transparent}.site-header nav a:hover{color:var(--ink);border-color:var(--red)}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 21px;border:1px solid var(--ink);border-radius:2px;background:var(--ink);color:var(--white);font-weight:700;font-size:13px;letter-spacing:.01em;cursor:pointer;transition:.18s}.button:hover{background:var(--red);border-color:var(--red);transform:translateY(-1px)}.button-small{min-height:38px;padding:8px 14px}.button-ghost{color:var(--ink);background:transparent;border-color:var(--line-dark)}.button-ghost:hover{color:#fff}.button-block{width:100%}.eyebrow{margin:0 0 16px;color:var(--red);font-size:11px;font-weight:700;letter-spacing:.18em}.hero{max-width:1240px;min-height:670px;margin:auto;padding:80px 32px 105px;display:grid;grid-template-columns:1.08fr .92fr;gap:88px;align-items:center}.hero-copy{position:relative}.hero-copy:before{content:"01";position:absolute;top:-44px;left:0;color:var(--line-dark);font:500 11px "DM Sans";letter-spacing:.2em}.hero h1{max-width:700px;margin:0;font-size:clamp(52px,6vw,82px);font-weight:600;line-height:.99;letter-spacing:-.06em}.hero h1 span{color:var(--red);font-family:"Noto Sans SC";font-weight:700}.lead{max-width:570px;margin:30px 0;color:var(--muted);font-size:18px}.hero-actions{display:flex;align-items:center;gap:24px}.text-link{font-size:13px;font-weight:700;border-bottom:1px solid var(--ink)}.trust-list{display:flex;gap:26px;margin:30px 0 0;padding:0;list-style:none;color:var(--muted);font-size:12px}.hero-card{position:relative;padding:30px;background:var(--white);border:1px solid var(--line);box-shadow:var(--shadow)}.hero-card:before{content:"学习进度";position:absolute;right:-18px;top:28px;padding:9px 8px;color:#fff;background:var(--red);font:600 11px "Noto Sans SC";letter-spacing:.12em;writing-mode:vertical-rl}.card-topline,.quiz-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.progress{height:3px;margin:13px 0 27px;background:var(--paper-2)}.progress span{display:block;height:100%;background:var(--red)}.today-card{display:grid;grid-template-columns:auto 1fr auto;gap:15px;align-items:center;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.label{grid-column:1/-1;color:var(--red);font-size:9px;font-weight:700;letter-spacing:.14em}.lesson-icon{display:grid;place-items:center;width:50px;height:50px;color:var(--red);border:1px solid var(--red);font:700 24px "Noto Sans SC"}.today-card p{margin:0;color:var(--muted);font-size:12px}.circle-button{width:36px;height:36px;border:1px solid var(--ink);border-radius:50%;background:transparent;cursor:pointer}.circle-button:hover{color:#fff;background:var(--ink)}.stats{display:grid;grid-template-columns:repeat(3,1fr);padding:24px 0}.stats div{text-align:center;border-right:1px solid var(--line)}.stats div:last-child{border:0}.stats strong,.stats span{display:block}.stats strong{font-size:20px}.stats span{color:var(--muted);font-size:10px}.ai-note{display:flex;gap:12px;padding:15px 0;border-top:1px solid var(--line)}.ai-note>span{color:var(--red)}.ai-note p{margin:0;font-size:12px}.section{padding:110px max(32px,calc((100vw - 1176px)/2))}.section h2{max-width:760px;margin:0;font-size:clamp(38px,4.5vw,58px);font-weight:600;line-height:1.06;letter-spacing:-.045em}.section-intro{max-width:640px;margin:20px 0 48px;color:var(--muted);font-size:16px}.path-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.path-card{min-height:390px;padding:32px 26px;border-right:1px solid var(--line);background:transparent}.path-card:last-child{border-right:0}.path-card.dark{color:var(--white);background:var(--ink)}.week{font-size:10px;font-weight:700;letter-spacing:.15em;color:var(--red)}.dark .week{color:#e67d70}.level-badge{display:flex;align-items:end;width:auto;height:92px;margin:25px 0 10px;color:var(--red);font:600 68px/1 "Noto Sans SC"}.dark .level-badge{color:#e67d70}.path-card h3{font-size:21px}.path-card p{color:var(--muted);font-size:14px}.dark p{color:#abb5b1}.path-card ul{padding-left:18px;font-size:13px}.demo-section{display:grid;grid-template-columns:1.12fr .88fr;gap:80px;background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.quiz{max-width:670px;padding:28px;background:var(--white);border:1px solid var(--line)}.quiz-progress span{width:33%}.hanzi{margin:26px 0 5px;color:var(--red);font:700 48px "Noto Sans SC"}.quiz h3{margin:0 0 22px;font-size:20px}.answers{display:grid;gap:8px}.answer{padding:13px 15px;text-align:left;border:1px solid var(--line);background:transparent;cursor:pointer}.answer:hover{border-color:var(--ink)}.answer.correct{border-color:var(--green);background:#e6eee9}.answer.wrong{border-color:var(--red);background:#f3e2df}.feedback{min-height:25px;font-size:13px}.quiz-next:disabled{opacity:.4}.coach-card{align-self:center;padding:28px;background:var(--white);border:1px solid var(--line);box-shadow:var(--shadow)}.coach-head{display:flex;align-items:center;gap:11px;padding-bottom:18px;border-bottom:1px solid var(--line)}.coach-head p{margin:0;color:var(--muted);font-size:10px}.spark{display:grid;place-items:center;width:38px;height:38px;color:var(--red);border:1px solid var(--red)}.online{margin-left:auto;color:var(--green);font-size:9px;font-weight:700;letter-spacing:.12em}.chat{max-width:88%;margin:16px 0;padding:13px 15px;font-size:12px}.chat.ai{background:var(--paper)}.chat.user{margin-left:auto;color:#fff;background:var(--ink)}.features{background:var(--white);border-bottom:1px solid var(--line)}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);margin-top:50px;border-top:1px solid var(--ink)}.feature-grid article{padding:28px 24px;border-right:1px solid var(--line)}.feature-grid article:last-child{border:0}.feature-grid article>span{color:var(--red);font:700 25px "Noto Sans SC"}.feature-grid h3{margin:22px 0 8px;font-size:18px}.feature-grid p{margin:0;color:var(--muted);font-size:13px}.pricing{display:grid;grid-template-columns:1fr 410px;gap:90px;align-items:center}.pricing-copy p:last-child{max-width:600px;color:var(--muted)}.price-card{padding:34px;color:#fff;background:var(--ink);border-top:5px solid var(--red)}.price-card>span{color:#d58b81;font-size:10px;font-weight:700;letter-spacing:.13em}.price{margin-top:17px;font-size:50px;font-weight:600;letter-spacing:-.05em}.price small{font-size:18px}.price-card>p,.price-card>small{color:#aeb8b4}.price-card ul{padding:18px 0;list-style:none;border-top:1px solid #46504c}.price-card li{margin:9px 0;font-size:13px}.price-card li:before{content:"—";margin-right:10px;color:#e67d70}footer{display:flex;gap:20px;align-items:center;max-width:1240px;margin:auto;padding:45px 32px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}footer p:last-child{margin-left:auto}
@media(max-width:860px){.site-header nav{display:none}.hero,.demo-section,.pricing{grid-template-columns:1fr}.hero{gap:50px;padding-top:65px}.path-grid{grid-template-columns:1fr}.path-card{min-height:auto;border-right:0;border-bottom:1px solid var(--line)}.feature-grid{grid-template-columns:1fr 1fr}.feature-grid article{border-bottom:1px solid var(--line)}.pricing{gap:45px}.hero-card:before{display:none}}
@media(max-width:540px){.site-header{padding:0 20px}.site-header .button{display:none}.hero{padding:65px 20px 75px}.hero h1{font-size:49px}.trust-list{flex-wrap:wrap;gap:8px 18px}.section{padding:80px 20px}.feature-grid{grid-template-columns:1fr}.feature-grid article{border-right:0}.price-card{padding:25px}footer{padding:35px 20px;align-items:flex-start;flex-direction:column}footer p:last-child{margin:0}}