:root{--paper:#f5f8ff;--ink:#203959;--blue:#3d65d8;--mint:#d7eee5;--yellow:#f2c65e;--muted:#526580}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}a,button,input{touch-action:manipulation}:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.topbar{max-width:1160px;margin:auto;padding:28px 36px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid #dae2f0}.brand{display:flex;align-items:center;gap:12px;font-weight:700;line-height:1.4}.brand-mark{background:var(--ink);color:white;border-radius:12px 12px 4px 12px;width:42px;height:44px;display:grid;place-items:center;font-size:23px}.brand small{display:block;font-size:9px;letter-spacing:.17em;font-weight:500;margin-top:5px;color:var(--muted)}.quiet{font-size:14px;padding:10px 0;color:var(--muted)}main{max-width:1088px;margin:auto;padding:0 36px}h1,h2,h3{font-family:"Hiragino Maru Gothic ProN","PingFang SC",sans-serif;line-height:1.25;letter-spacing:-.035em}h1{font-size:clamp(36px,4.8vw,58px);margin:16px 0 24px}h2{font-size:24px;margin:0}h3{font-size:24px;margin:0 0 12px}.eyebrow{font-size:13px;font-weight:600;letter-spacing:.08em;color:var(--muted)}.intro{font-size:18px;color:var(--muted);line-height:1.9}.welcome{padding:56px 0 48px;display:flex;align-items:center;justify-content:space-between;gap:30px}.bookmark{background:var(--mint);border-radius:4px 4px 52px 4px;transform:rotate(5deg);padding:30px;width:225px;display:flex;flex-direction:column;gap:24px;border-top:9px solid var(--ink)}.bookmark strong{font:800 35px/1.1 Georgia,serif;letter-spacing:-.04em}.bookmark span{font-size:12px}.section-label{display:flex;justify-content:space-between;align-items:baseline;gap:15px;margin-bottom:22px}.section-label>span{font-size:13px;color:var(--muted)}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.course{display:flex;align-items:stretch;background:white;border:1px solid #dce4f3;border-radius:14px;overflow:hidden;min-height:260px;box-shadow:0 4px 0 #e6ecf6;transition:transform .2s,box-shadow .2s}.course:hover{transform:translateY(-4px);box-shadow:0 8px 0 #e6ecf6}.cover{background:var(--blue);color:white;width:44%;min-width:160px;padding:21px 20px 26px 25px;position:relative;display:flex;flex-direction:column;justify-content:space-between}.book-label{font-size:9px;letter-spacing:.04em;opacity:.85}.cover>strong{font-size:20px}.book-art{position:relative;display:block;min-height:125px;padding-top:5px}.book-art>span:first-child{font:italic bold 72px Georgia,serif;letter-spacing:-.09em}.speech{position:absolute;right:-6px;bottom:8px;padding:3px 12px;background:var(--yellow);color:var(--ink);border-radius:10px 10px 10px 0;transform:rotate(-8deg);font-size:15px;font-weight:700}.book-spine{position:absolute;left:7px;top:0;bottom:0;border-left:1px solid #ffffff38}.course-info{padding:26px 22px;display:flex;flex-direction:column;flex:1}.course-info p{font-size:14px;color:var(--muted);margin:0 0 24px}.start{display:flex;justify-content:space-between;gap:10px;margin-top:auto;font-weight:700;font-size:15px;color:var(--blue);border-top:1px solid #e5ebf5;padding-top:16px}.note{display:flex;align-items:center;gap:18px;margin:34px 0;color:var(--muted);font-size:14px}.note>span{font-size:34px;color:#9c720e}.note p{margin:0}.note strong{font-weight:500}footer{max-width:1088px;margin:40px auto 0;padding:24px 36px;color:var(--muted);font-size:12px;border-top:1px solid #dae2f0;display:flex;gap:10px}.auth-layout{min-height:650px;display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;padding:40px 0}.form-card{background:white;border:1px solid #dce4f3;border-radius:22px;padding:36px;box-shadow:0 8px 0 #e6ecf6}.form-card h2{font-size:28px}.form-card>p{color:var(--muted)}label{display:block;font-size:14px;font-weight:600;margin:26px 0 8px}input[type=password]{width:100%;min-height:52px;border:1px solid #a7b5cd;border-radius:9px;padding:10px 14px;background:#fcfdff}button,.button{display:block;width:100%;border:0;border-radius:9px;background:var(--ink);color:white;padding:13px 20px;min-height:52px;cursor:pointer;text-align:center;font-weight:600}button:hover,.button:hover{background:var(--blue)}button span{float:right}.error{font-size:14px;color:#b2353b;min-height:24px;margin:8px 0 15px}.form-card .hint{font-size:12px;line-height:1.9;margin-top:22px;margin-bottom:0}.letter-row{display:flex;gap:12px;margin-top:36px}.letter-row span{width:56px;height:60px;display:grid;place-items:center;border-radius:10px;background:var(--mint);font:bold 38px Georgia,serif;transform:rotate(-7deg)}.letter-row span:nth-child(2){background:var(--yellow);transform:rotate(6deg)}.letter-row span:nth-child(3){background:#dce5ff;transform:rotate(-3deg)}.message-card{max-width:540px;margin:80px auto;background:white;padding:40px;border:1px solid #dce4f3;border-radius:20px}.message-card h1{font-size:32px}.message-card p{color:var(--muted)}.message-card form,.message-card .button{margin-top:28px}.secondary{display:block;text-align:center;padding:14px;color:var(--muted)}.empty{padding:32px;background:white;border-radius:14px}@media(max-width:800px){.course-grid{grid-template-columns:1fr}.course{max-width:560px}.auth-layout{gap:32px}.form-card{padding:28px}.bookmark{width:190px}}@media(max-width:600px){.topbar{padding:20px;gap:12px}.brand{font-size:14px}.brand-mark{width:36px;height:40px}.quiet{font-size:12px}main{padding:0 22px}.welcome{padding:36px 0;gap:15px}.welcome h1{font-size:35px}.welcome .intro{font-size:14px}.bookmark{display:none}.section-label{display:block}.section-label>span{display:block;margin-top:8px}.course{min-height:245px}.cover{min-width:135px;width:43%;padding:19px 14px 22px 20px}.book-label{font-size:8px}.course-info{padding:24px 18px}.course-info h3{font-size:22px}.course-info p{font-size:13px}.auth-layout{display:block;padding:30px 0;min-height:0}.auth-intro h1{font-size:36px;margin-bottom:12px}.auth-intro .intro{font-size:15px}.letter-row{display:none}.form-card{margin-top:26px;padding:26px}.auth-intro .eyebrow{font-size:11px}.message-card{padding:28px;margin:40px auto}.message-card h1{font-size:27px}footer{padding:22px;margin-top:20px;font-size:11px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}