:root{--blue:#1754e8;--navy:#10224b;--ink:#172641;--muted:#687589;--line:#e2e7ef;--bg:#f4f6fa;--white:#fff;--orange:#f87742;--radius:18px;font-family:Arial,Helvetica,sans-serif;color:var(--ink);font-size:16px;background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:var(--blue)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #ff9c62;outline-offset:3px}button{border:0}h1,h2,h3,p{margin:0}h1{font-size:clamp(28px,3vw,40px);letter-spacing:-1.3px;line-height:1.15}h2{font-size:23px;letter-spacing:-.5px}h3{font-size:18px;line-height:1.4}p{line-height:1.65}.shell{display:grid;grid-template-columns:236px 1fr;min-height:100vh}.sidebar{background:var(--navy);color:#fff;padding:32px 20px;display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:236px;z-index:10}.brand{display:flex;align-items:center;gap:10px;font-size:25px;font-weight:800;letter-spacing:-1px;color:inherit;text-decoration:none}.brand img{width:38px;height:38px}.brand-sub{font-size:12px;line-height:1.5;color:#aab7d4;margin:15px 9px 40px;letter-spacing:1.2px;text-transform:uppercase}.nav{display:flex;flex-direction:column;gap:8px}.nav a{display:flex;gap:12px;align-items:center;text-decoration:none;color:#becbe3;padding:14px;border-radius:10px;font-size:15px}.nav a.active{background:#253b66;color:white}.nav a:hover{background:#23385f;color:#fff}.icon{width:21px;height:21px;display:inline-block;flex-shrink:0}.sidebar-bottom{margin-top:auto;padding:24px 10px 0;border-top:1px solid #334363;color:#acbbd7;font-size:14px;line-height:1.6}.sidebar-bottom strong{color:white;display:block;margin-bottom:5px}.main{grid-column:2;padding:0 48px 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var(--line)}.btn.secondary:hover{background:#edf2fc}.btn.ghost{background:transparent;color:var(--muted);padding:8px 12px}.btn.danger{background:#fff1ee;color:#b33c23;border:1px solid #ffd1c5}.hero{background:var(--blue);color:white;border-radius:var(--radius);padding:32px;position:relative;overflow:hidden;margin-bottom:32px}.hero .eyebrow{color:#becffd;margin-bottom:16px}.hero h2{font-size:30px;letter-spacing:-.8px;margin-bottom:12px}.hero p{color:#dce5ff;max-width:650px}.quick-form{display:flex;gap:10px;margin-top:25px}.quick-form input{flex:1;min-width:0;border:none;padding:16px 18px;border-radius:10px;background:white;color:var(--ink)}.quick-form .btn{background:#fff;color:var(--blue);white-space:nowrap}.hero-bottom{display:flex;gap:22px;margin-top:20px;font-size:13px;color:#dce5ff;flex-wrap:wrap}.section-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px}.section-head a{font-size:14px;text-decoration:none}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lesson-card{padding:23px;background:white;border:1px solid var(--line);border-radius:16px;display:flex;flex-direction:column;min-height:245px;color:inherit;text-decoration:none;transition:transform .15s,box-shadow .15s}.lesson-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px #17366d10}.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:23px}.label{font-size:12px;font-weight:700;border-radius:6px;background:#edf2fd;color:#3b5c97;padding:6px 9px;line-height:1.4}.label.orange{background:#fff0e6;color:#a5501e}.label.green{background:#eaf6f0;color:#2b7053}.lesson-card h3{margin-bottom:10px}.lesson-card p{font-size:14px;color:var(--muted);margin-bottom:22px}.card-footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:15px;margin-top:auto;font-size:13px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin:28px 0;gap:16px}.stat{border-top:2px solid #ccd7eb;padding:16px 0}.stat b{font-size:26px;display:block;letter-spacing:-1px;margin-bottom:5px}.stat span{font-size:14px;color:var(--muted)}.note{padding:18px 22px;background:#edf2ff;border-radius:12px;font-size:14px;color:#39517c;line-height:1.6;display:flex;gap:13px;align-items:flex-start;margin-top:24px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:26px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.full{grid-column:1/-1}label{display:block;font-size:14px;font-weight:600;margin-bottom:9px}input,select,textarea{width:100%;padding:13px 14px;border:1px solid #d6deea;border-radius:9px;background:#fff;color:var(--ink);line-height:1.5}textarea{resize:vertical;min-height:100px}input::placeholder,textarea::placeholder{color:#8b96a7}.form-section{margin-bottom:25px;padding-bottom:24px;border-bottom:1px solid var(--line)}.form-section h3{margin-bottom:21px}.form-actions{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-top:25px}.form-actions p{font-size:13px;color:var(--muted);max-width:350px}.aside-title{font-size:17px;margin-bottom:18px}.check-list{list-style:none;padding:0;margin:0}.check-list li{display:flex;align-items:center;gap:12px;margin:16px 0;font-size:14px}.check-list li:before{content:'✓';color:var(--blue);font-weight:700}.aside-caption{font-size:13px;color:var(--muted);padding-top:20px;margin-top:20px;border-top:1px solid var(--line);line-height:1.65}.tabs{display:flex;overflow:auto;gap:6px;border-bottom:1px solid var(--line);margin:26px 0}.tab{background:transparent;color:var(--muted);padding:14px 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p{color:var(--muted);margin-bottom:22px}.login{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.login-intro{background:var(--navy);color:white;padding:70px;display:flex;flex-direction:column;justify-content:space-between;gap:40px}.login-intro h1{font-size:clamp(40px,4vw,64px);line-height:1.08;max-width:560px}.login-intro p{margin-top:24px;color:#bdcce8;max-width:440px}.login-form{display:flex;align-items:center;justify-content:center;padding:50px}.login-box{width:100%;max-width:420px}.login-box h2{font-size:30px;margin-bottom:12px}.login-box p{margin-bottom:28px;color:var(--muted)}.login-box label{margin-top:18px}.login-box .btn{width:100%;margin-top:24px}.login-switch{font-size:14px;text-align:center;margin-top:20px}.text-button{background:none;color:var(--blue);padding:0;font-size:inherit}.error{color:#b02a20;background:#fff0ee;padding:12px 16px;border-radius:8px;font-size:14px;line-height:1.5;margin:12px 0}.loader{padding:80px;text-align:center;color:var(--muted)}.spinner{width:34px;height:34px;border:3px solid #dce5ff;border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 20px}@keyframes spin{to{transform:rotate(360deg)}}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--navy);color:#fff;padding:14px 22px;border-radius:10px;z-index:100;box-shadow:0 5px 30px #0002;max-width:90vw;display:none;font-size:14px}.file-row{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}.file-row:last-child{border:0}.file-row h3{font-size:16px}.file-row p{color:var(--muted);font-size:13px;margin-top:6px}.upload{display:block;padding:30px;border:1px dashed 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18px;display:block}.sidebar .brand{font-size:23px}.brand-sub,.sidebar-bottom{display:none}.nav{flex-direction:row;overflow:auto;margin-top:15px;gap:5px}.nav a{font-size:13px;padding:9px;white-space:nowrap;gap:6px}.nav .icon{width:17px}.main{padding:0 18px 40px}.topbar{height:68px;margin-bottom:25px}.topbar>.eyebrow{display:none}.user{margin-left:auto}.page-head{flex-direction:column}h1{font-size:29px;letter-spacing:-.8px}.hero{padding:24px}.hero h2{font-size:25px}.quick-form{flex-direction:column}.grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.full{grid-column:auto}.panel{padding:20px}.workspace aside{display:block}.workspace aside>.panel{margin-top:16px}.form-actions{align-items:stretch;flex-direction:column}.stats{gap:12px}.stat b{font-size:23px}.stat span{font-size:12px}.login{display:block}.login-intro{padding:28px;gap:30px}.login-intro h1{font-size:35px}.login-intro p{margin-top:16px;font-size:15px}.login-intro>.small{display:none}.login-form{padding:32px 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[hidden] { display: none !important; }

/* Unified interface: restrained palette, consistent spacing and accessible states. */
:root{--blue:#2855a7;--navy:#192d4b;--ink:#243247;--muted:#637184;--line:#dfe5ed;--bg:#f5f7fa;--radius:12px}
h1{letter-spacing:-.7px}h2{letter-spacing:-.3px}.main{min-width:0}.panel,.lesson-card,.hero,.empty{border-radius:var(--radius)}.lesson-card{transition:border-color .15s,box-shadow .15s}.lesson-card:hover{transform:none;border-color:#a7b9d3;box-shadow:0 4px 16px #17366d0a}.btn{min-height:44px;border-radius:8px}.btn:disabled{cursor:not-allowed}.btn.ghost:hover{background:#e8edf5}.nav a{min-height:44px;border-radius:8px}.brand-sub{letter-spacing:.8px}.hero{background:#eaf0f8;color:var(--ink);border:1px solid #d6e1f0}.hero .eyebrow,.hero p,.hero-bottom{color:#526783}.quick-form .btn{background:var(--blue);color:#fff}.hero h2{font-size:28px}.note{background:#eef3f9;border:1px solid #dce5f1;border-radius:8px;flex-wrap:wrap}.note a{font-weight:600}.label{font-weight:600}.login-intro{background:var(--navy)}.login-intro h1{font-size:clamp(36px,4vw,58px)}.login-form{background:#fff}.login-box p{line-height:1.6}.user{flex-wrap:wrap}.topbar{height:auto;min-height:94px;padding:18px 0}.card-footer{gap:12px;flex-wrap:wrap}.lesson-card h3{overflow-wrap:anywhere}.file-row h3{overflow-wrap:anywhere}.download-list .btn{min-width:0}.tab:focus-visible{outline-offset:-3px}.reading{max-width:80ch}.upload{background:#f8fafc}.sidebar-bottom{font-size:13px}.sidebar-bottom strong{font-size:14px}.login-intro .small{line-height:1.8}
@media(max-width:700px){.topbar{min-height:68px}.user{font-size:13px;gap:8px}.user .avatar{display:none}.hero h2{font-size:24px}.login-intro h1{font-size:34px}.login-intro{padding:28px 24px}.login-intro p{max-width:none}.login-form{padding:32px 24px 48px}.note{padding:16px}.nav a{min-height:44px}.tabs{margin-top:18px}.section-head{align-items:flex-start}.section-head a{white-space:nowrap}.file-row{flex-wrap:wrap}}