:root{--bg:#f7f9f5;--ink:#213c33;--muted:#81928a;--green:#37866b;--deep:#27654f;--mint:#e5f3e9;--line:#e5ece5;--cream:#fff9ea;--shadow:0 20px 65px rgba(37,79,54,.07)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9bc6e1;outline-offset:2px}h1,h2,h3,p{margin:0}h1{font-size:clamp(28px,3.5vw,44px);line-height:1.26;letter-spacing:-1.4px}h2{font-size:23px;letter-spacing:-.5px}h3{font-size:17px}.muted{color:var(--muted)}.small{font-size:12px}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:800;color:#4b9577;text-transform:uppercase}.btn{border:0;border-radius:14px;padding:13px 22px;font-weight:750;background:var(--green);color:white;transition:.19s ease;display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px}.btn:hover{background:var(--deep);transform:translateY(-2px);box-shadow:0 8px 24px #31806433}.btn:active{transform:scale(.97)}.btn.alt{background:#e8f2e9;color:#286b54}.btn.white{background:white;color:var(--green)}.btn.outline{background:white;color:var(--ink);border:1px solid var(--line)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.row{display:flex;gap:12px;align-items:center}.between{justify-content:space-between}.card{border:1px solid var(--line);background:white;border-radius:24px;padding:25px;box-shadow:var(--shadow)}.tag{font-size:11px;font-weight:700;background:#e8f4e9;color:#41856c;padding:5px 10px;border-radius:30px;white-space:nowrap}.brand{display:flex;align-items:center;gap:11px;font-size:21px;font-weight:850;letter-spacing:-1px}.brandicon{width:44px;height:44px;display:grid;place-items:center;background:#4e9e7b;color:#fff;border-radius:15px;box-shadow:0 5px 0 #c8e4d5;transform:rotate(-6deg)}.brand small{display:block;color:#89a195;font-size:10px;letter-spacing:2.8px;font-weight:700;line-height:1.2}.auth{min-height:100vh;display:grid;grid-template-columns:1.03fr .97fr;background:#fff}.auth-art{padding:52px clamp(25px,6vw,100px);background:linear-gradient(145deg,#e6f3e9,#f9f8e9 75%);display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;position:relative}.auth-art h1{max-width:590px;margin-top:58px}.auth-art p{max-width:440px;margin-top:20px;line-height:1.9;color:#698379}.auth-stars{position:absolute;right:-80px;bottom:-80px;width:470px;height:470px;background:#d5eadb;border-radius:50%;opacity:.6}.auth-figure{height:340px;position:relative;display:grid;place-items:center;z-index:1}.auth-pane{display:flex;align-items:center;justify-content:center;padding:42px 36px}.authbox{max-width:420px;width:100%}.authbox h2{font-size:31px;margin:24px 0 8px}.authbox>p{margin-bottom:27px;color:var(--muted)}.fields{display:grid;gap:16px}.field label{display:block;font-size:13px;font-weight:700;margin-bottom:7px}.field input{background:#f9faf8;border:1px solid #e0e9e1;border-radius:13px;padding:13px 15px;width:100%;height:49px;color:var(--ink)}.field input:focus{border-color:#70b398}.auth-switch{display:flex;gap:8px;border-radius:15px;background:#f2f6f1;padding:5px;margin-bottom:18px}.auth-switch button{flex:1;padding:10px;border:0;border-radius:11px;background:transparent;color:#7f9188;font-weight:700}.auth-switch button.active{background:white;color:var(--green);box-shadow:0 3px 12px #365d3c14}.help{font-size:12px;color:var(--muted);margin-top:14px}.err{color:#b4473d;font-size:13px;min-height:21px}.authbox .btn{width:100%;margin-top:9px}.skip{margin-top:15px;display:block;text-align:center;color:var(--green);text-decoration:underline;background:none;border:0;width:100%;padding:9px}.cube{width:138px;height:138px;border-radius:36px;background:#9ccfb0;position:relative;box-shadow:inset 0 -11px #8abc9e,0 25px 40px #4d85683b;transform:rotate(-5deg);animation:float 3.6s ease-in-out infinite}.cube:before{content:'';position:absolute;left:24px;right:24px;top:48px;height:37px;background:radial-gradient(circle at 16% 46%,#274c3e 0 13px,transparent 14px),radial-gradient(circle at 84% 46%,#274c3e 0 13px,transparent 14px)}.cube:after{content:'ᴗ';position:absolute;top:72px;left:60px;color:#245240;font-size:28px}.cube .blush{position:absolute;top:85px;left:25px;width:17px;height:8px;border-radius:50%;background:#eebc9f;box-shadow:73px 0 #eebc9f}.cube .cap{position:absolute;top:-30px;left:38px;font-size:43px;transform:rotate(9deg)}.cube .arm{position:absolute;width:35px;height:10px;background:#77b58d;border-radius:10px;right:-28px;top:80px;transform:rotate(-30deg)}@keyframes float{50%{transform:translateY(-12px) rotate(3deg)}}.auth-figure .cube{width:186px;height:186px;border-radius:47px;transform:scale(1.1);zoom:1.15}.auth-figure .cube:before{top:72px;left:38px;right:38px}.auth-figure .cube:after{top:98px;left:88px}.auth-figure .cube .cap{top:-34px;left:64px}.auth-figure .cube .blush{top:105px;left:40px;box-shadow:95px 0 #eebc9f}.layout{display:grid;grid-template-columns:246px minmax(0,1fr);min-height:100vh}.side{position:sticky;top:0;height:100vh;background:white;border-right:1px solid var(--line);padding:29px 16px;display:flex;flex-direction:column;gap:30px}.side .brand{padding:0 12px}.nav{display:grid;gap:7px}.nav button{display:flex;align-items:center;gap:14px;border:0;background:transparent;border-radius:14px;text-align:left;color:#839189;padding:13px 16px;font-weight:650}.nav button.active,.nav button:hover{background:#e7f4eb;color:#2e7e5e}.nav button .ico{font-size:19px;width:25px}.sidefoot{margin-top:auto;background:#eff6ec;border-radius:20px;padding:19px}.workspace{width:100%;max-width:1250px;margin:auto;padding:32px 48px 115px}.top{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}.top .muted{font-size:13px}.top select{border:1px solid var(--line);border-radius:25px;background:white;padding:8px 11px}.top .chip{background:#f0e3cf;border-radius:50%;width:36px;height:36px;display:grid;place-items:center}.page{display:none;animation:appear .3s ease both}.page.active{display:block}@keyframes appear{from{opacity:.35;transform:translateY(9px)}to{opacity:1;transform:none}}.hero{background:linear-gradient(112deg,#e0f1e4,#f3f7e6);border-radius:30px;min-height:280px;display:flex;justify-content:space-between;align-items:center;padding:38px;overflow:hidden}.hero p{max-width:450px;margin:15px 0 24px;color:#698479}.hero .cube{transform:scale(.83);margin-right:35px;flex-shrink:0}.sectionhead{display:flex;align-items:center;justify-content:space-between;margin:30px 0 15px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:19px}.stat strong{display:block;font-size:31px;margin:9px 0 4px}.stats .card{padding:18px 22px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.course{overflow:hidden;padding:0}.courseart{height:118px;display:grid;place-items:center;font-size:41px;background:#e5f2e9}.course:nth-child(2) .courseart{background:#fff0dd}.course:nth-child(3) .courseart{background:#e7eefb}.course:nth-child(4) .courseart{background:#f2eaf7}.course:nth-child(5) .courseart{background:#f6f1df}.coursebody{padding:19px}.coursebody p{margin:7px 0 15px}.coursebody button{width:100%}.twocol{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}.metric{height:8px;border-radius:9px;background:#e7eee8;overflow:hidden;margin-top:13px}.metric i{height:100%;display:block;background:#81bea0;border-radius:8px}.choices{display:grid;gap:11px;margin:24px 0}.choice{width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:16px;padding:15px 17px;color:var(--ink);display:flex;align-items:center;gap:12px;transition:.17s}.choice:hover{border-color:#8cbea1;background:#f7fcf8}.choice.chosen{background:#e7f5ea;border-color:#4fa17c}.choice .letter{background:#f1f5ef;padding:5px 11px;border-radius:9px;font-weight:800}.notice{background:#eaf5ed;border-radius:15px;padding:16px;margin:16px 0}.notice.warn{background:#fff2df}.lesson-layout{display:grid;grid-template-columns:1.4fr .8fr;gap:18px}.video{aspect-ratio:16/9;background:#e6eee8;border:1px dashed #acc6b4;border-radius:18px;display:grid;place-items:center;text-align:center;overflow:hidden}.video video{width:100%;height:100%}.quote{background:#f4f8f1;padding:15px;border-radius:14px;margin:12px 0}.footer{margin-top:33px;font-size:12px;color:#98a89b}.mobile{display:none}.tutor{position:fixed;right:25px;bottom:24px;z-index:15;display:flex;align-items:end;gap:12px}.tutor .cube{width:69px;height:69px;border-radius:22px;animation:none;box-shadow:inset 0 -5px #8abc9e,0 10px 28px #38523f30;transform:rotate(-4deg)}.tutor .cube:before{top:21px;left:12px;right:12px;height:25px;background:radial-gradient(circle at 16% 46%,#274c3e 0 7px,transparent 8px),radial-gradient(circle at 84% 46%,#274c3e 0 7px,transparent 8px)}.tutor .cube:after{top:30px;left:29px;font-size:16px}.tutor .cube .cap{top:-19px;left:19px;font-size:27px}.tutor .cube .blush{display:none}.tutorbtn{background:none;border:0;padding:8px}.bubble{max-width:270px;background:white;padding:17px;border-radius:20px;border:1px solid var(--line);box-shadow:0 14px 42px #32534419}.bubble strong{display:block;margin-bottom:5px}.bubble p{font-size:13px;color:#61776c}.bubble button{background:none;border:0;color:#39856a;font-size:12px;padding:9px 0 0}.hidden{display:none!important}@media(max-width:950px){.cards{grid-template-columns:repeat(2,1fr)}.workspace{padding:25px 24px 100px}.layout{grid-template-columns:200px 1fr}.side{padding:21px 10px}.twocol,.lesson-layout{grid-template-columns:1fr}}@media(max-width:700px){.auth{display:block;background:var(--bg)}.auth-art{min-height:240px;padding:23px 24px;display:block}.auth-art h1{font-size:27px;margin-top:30px;max-width:320px}.auth-art p{font-size:13px;margin-top:8px;max-width:260px}.auth-figure{position:absolute;right:-15px;bottom:7px;height:120px;width:135px;opacity:.87}.auth-figure .cube{zoom:.6}.auth-stars{width:170px;height:170px;right:-40px;bottom:-60px}.auth-pane{padding:24px 23px 40px}.authbox h2{font-size:26px;margin:10px 0 7px}.side{display:none}.layout{display:block}.workspace{padding:20px 17px 120px}.top{margin-bottom:22px}.hero{min-height:255px;padding:26px 22px}.hero h1{font-size:27px;max-width:270px}.hero p{font-size:13px;max-width:250px}.hero .cube{width:90px;height:90px;border-radius:25px;margin:90px -12px 0 -40px;opacity:.7}.hero .cube:before{top:25px;left:15px;right:15px}.hero .cube:after{top:44px;left:37px}.hero .cube .cap{left:22px}.hero .cube .blush{display:none}.hero>div:first-child{z-index:1}.stats{gap:8px}.stats .card{padding:12px}.stat strong{font-size:24px}.stat .small{font-size:10px}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.courseart{height:80px}.coursebody{padding:13px}.coursebody h3{font-size:15px}.card{padding:17px;border-radius:19px}.mobile{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:12;background:white;border-top:1px solid var(--line);padding:9px 3px calc(9px + env(safe-area-inset-bottom));justify-content:space-around}.mobile button{border:0;background:transparent;color:#85958b;font-size:10px;display:grid;justify-items:center;gap:2px;min-width:55px}.mobile button.active{color:var(--green);font-weight:800}.mobile .ico{font-size:19px}.tutor{right:8px;bottom:78px;gap:0}.bubble{max-width:min(245px,calc(100vw - 95px))}.sectionhead{margin-top:23px}.sectionhead h2{font-size:19px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}