:root{--ink:#183b49;--muted:#61757a;--paper:#f7f5ef;--white:#fffefa;--line:#dfe5df;--coral:#e89367;--coral-dark:#c96c45;--mint:#dcebe5;--blue:#e6eef0;--sand:#f3e8d5;--shadow:0 14px 40px rgba(28,52,60,.08);font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #f1b189;outline-offset:2px}
.shell{display:flex;min-height:100dvh}.rail{position:sticky;top:0;align-self:flex-start;width:244px;min-width:244px;height:100dvh;padding:27px 17px;background:var(--ink);color:#fff;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:11px;padding:6px 12px 38px}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:15px;background:var(--coral);font-weight:900;font-size:25px;letter-spacing:-5px;padding-right:5px}.brand-mark span{color:#fff3da}.brand strong{display:block;font-size:19px;letter-spacing:.12em}.brand small{display:block;font-size:9px;letter-spacing:.21em;color:#b9d1d2;margin-top:4px}.rail-label{padding:0 15px 12px;color:#8caeb4;font-size:11px;letter-spacing:.18em}.nav-list{display:grid;gap:5px}.nav-link{width:100%;padding:13px 14px;display:flex;gap:14px;align-items:center;border:0;border-radius:13px;background:none;color:#c0d5d9;text-align:left;font-weight:650}.nav-link.active,.nav-link:hover{background:#355b66;color:#fff}.nav-icon{font-size:19px;width:22px;text-align:center}.rail-bottom{margin-top:auto;padding:14px;color:#c0d5d9;font-size:12px;border-top:1px solid #365663;display:flex;align-items:center;gap:8px}.online-dot{width:7px;height:7px;background:#91d3a5;border-radius:50%}
.app-column{min-width:0;flex:1}.topbar{height:86px;background:rgba(255,254,250,.9);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:14px;padding:0 clamp(20px,4vw,64px);position:sticky;top:0;z-index:10}.topbar-kicker{font-size:10px;font-weight:750;letter-spacing:.19em;color:var(--coral-dark)}.topbar-title{font-size:21px;font-weight:850;letter-spacing:.04em}.topbar-title span{font-size:13px;font-weight:550;color:var(--muted)}.topbar-left{display:flex;align-items:center;gap:10px}.mobile-logo{display:none}.topbar-actions{display:flex;align-items:center;gap:10px}.grade-picker{display:flex;gap:7px;align-items:center;padding:7px 10px;border:1px solid var(--line);background:#fff;border-radius:9px;font-size:12px;color:var(--muted)}.grade-picker select{background:transparent;border:0;color:var(--ink);font-weight:750;outline:0}.sync-indicator{border:1px solid #d3e3dc;color:#54796b;background:#f0f8f1;padding:8px 11px;border-radius:9px;font-size:12px;font-weight:700}
main{max-width:1190px;margin:0 auto;padding:30px clamp(20px,4vw,64px) 100px;min-height:calc(100dvh - 86px)}.eyebrow{font-size:11px;letter-spacing:.2em;font-weight:800;color:var(--coral-dark);text-transform:uppercase}.page-title{font-size:clamp(28px,3.2vw,42px);line-height:1.25;margin:9px 0 9px;letter-spacing:-.025em}.page-sub{margin:0 0 26px;color:var(--muted);line-height:1.7}.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:18px}.span-4{grid-column:span 4}.span-5{grid-column:span 5}.span-6{grid-column:span 6}.span-7{grid-column:span 7}.span-8{grid-column:span 8}.span-12{grid-column:span 12}.card{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:var(--shadow);min-width:0}.card h2,.card h3{margin:0 0 12px}.card h2{font-size:19px}.card h3{font-size:16px}.soft-mint{background:var(--mint)}.soft-blue{background:var(--blue)}.soft-sand{background:var(--sand)}.dark{background:var(--ink);color:white;border-color:var(--ink)}.hero{background:linear-gradient(125deg,#183b49 48%,#3a6570);color:#fff;position:relative;overflow:hidden;min-height:265px;padding:30px}.hero:after{content:"";position:absolute;width:300px;height:300px;border:33px solid rgba(255,255,255,.08);border-radius:50%;right:-95px;top:-100px}.hero .eyebrow{color:#f6bb98}.hero h1{font-size:clamp(32px,3.4vw,49px);margin:17px 0 8px;line-height:1.18}.hero p{max-width:450px;color:#d6e4e5;line-height:1.7;position:relative;z-index:1}.hero .btn{position:relative;z-index:1;margin-top:11px}.hero-small{font-size:11px;letter-spacing:.15em;color:#bed7d7}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:30px 0 14px}.section-head h2{margin:0;font-size:19px}.section-head p{margin:4px 0 0;color:var(--muted);font-size:13px}.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;border:0;border-radius:11px;padding:11px 16px;font-weight:760;background:var(--ink);color:#fff;min-height:42px}.btn:hover{filter:brightness(1.07)}.btn.light{background:#fff;color:var(--ink)}.btn.coral{background:var(--coral);color:#173342}.btn.ghost{background:#edf3f0;color:var(--ink)}.btn.outline{background:transparent;color:var(--ink);border:1px solid #b7c9c8}.btn.tiny{font-size:12px;padding:7px 10px;min-height:32px;border-radius:8px}.btn.full{width:100%}.btn-row{display:flex;gap:9px;flex-wrap:wrap}.inline-link{border:0;background:none;color:var(--coral-dark);font-size:13px;font-weight:750;padding:5px 0}.metric-number{font-size:34px;font-weight:850;letter-spacing:-.04em}.metric-label{color:var(--muted);font-size:13px}.progress{height:9px;border-radius:10px;background:#dce5e1;overflow:hidden}.progress>span{display:block;height:100%;background:var(--coral);border-radius:10px;transition:width .25s}.dark .progress{background:#50717b}.statline{display:flex;align-items:center;justify-content:space-between;gap:12px}.muted{color:var(--muted)}.small{font-size:12px;line-height:1.6}.dark .muted{color:#d0e1e2}
.task-list,.word-list,.list{display:grid;gap:9px}.task-item,.list-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border:1px solid var(--line);border-radius:13px;background:#fff}.task-item.done{background:#f0f6f0;color:#57725f}.task-left{display:flex;align-items:center;gap:12px}.task-badge{height:34px;width:34px;border-radius:10px;background:#ecf3ef;display:grid;place-items:center;color:#537e71;font-weight:800}.task-item.done .task-badge{background:#cfe8d7}.checkmark{font-size:18px}.panel-tabs{display:flex;gap:7px;overflow-x:auto;padding-bottom:6px;margin-bottom:18px;scrollbar-width:none}.panel-tabs button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 14px;color:var(--muted);font-weight:720;white-space:nowrap}.panel-tabs button.active{color:#fff;border-color:var(--ink);background:var(--ink)}.word-row{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding:14px 0}.word-row:last-child{border-bottom:0}.word{font-size:20px;font-weight:850}.word-meta{font-size:13px;color:var(--muted);margin-top:3px}.word-actions{display:flex;gap:6px;align-items:center}.tag{display:inline-flex;align-items:center;border-radius:999px;background:#edf2ed;color:#4d7464;padding:5px 9px;font-size:11px;font-weight:700;white-space:nowrap}.tag.orange{background:#f9e6d7;color:#ae623b}.tag.blue{background:#e4edf0;color:#376776}.empty{padding:35px 14px;text-align:center;color:var(--muted);border:1px dashed #cddad4;border-radius:14px}.answer{padding:15px;border-radius:12px;background:#ecf4f0;margin:12px 0}.answer.wrong{background:#fff0e8}.choice-list{display:grid;gap:8px;margin:15px 0}.choice{width:100%;border:1px solid var(--line);background:#fff;border-radius:11px;padding:12px;text-align:left;color:var(--ink)}.choice:hover{border-color:#7ab1a4}.choice.correct{background:#e5f4ea;border-color:#6fac83}.choice.incorrect{background:#fae5dc;border-color:#d88a70}.form-grid{display:grid;gap:12px}.field label{display:block;font-weight:700;font-size:13px;margin-bottom:7px}.field input,.field select,.field textarea{width:100%;border:1px solid #bdcecb;border-radius:11px;background:#fff;padding:11px 13px;color:var(--ink);outline:0}.field textarea{min-height:105px;resize:vertical}.field input:focus,.field textarea:focus{border-color:#5d9b91}.text-block{line-height:1.9;font-size:16px}.note-card{border:1px solid var(--line);padding:15px;border-radius:13px;background:white}.note-card p{white-space:pre-wrap;margin:7px 0 0;line-height:1.7}.quote{font-size:22px;line-height:1.55;font-weight:700}.divider{height:1px;background:var(--line);margin:20px 0}.achievement{display:flex;gap:11px;align-items:center}.achievement-icon{background:#ffebdb;color:#c17147;border-radius:12px;height:40px;width:40px;display:grid;place-items:center;font-size:20px}.hint{border-left:3px solid var(--coral);padding:7px 12px;background:#fff8ee;font-size:13px;line-height:1.7;color:#805c4b;border-radius:0 8px 8px 0}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}.mobile-nav{display:none}.mobile-logo{font-weight:900;font-size:21px;color:var(--coral-dark)}
.modal{width:min(520px,calc(100vw - 24px));max-height:min(88dvh,750px);border:1px solid var(--line);border-radius:20px;padding:0;background:var(--white);box-shadow:0 25px 80px #183b4940;color:var(--ink)}.modal::backdrop{background:#10262dbc;backdrop-filter:blur(2px)}.modal-inner{padding:23px;overflow:auto;max-height:min(88dvh,750px)}.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.modal-head h2{margin:0;font-size:21px}.modal-close{border:0;background:#edf2ef;border-radius:9px;width:34px;height:34px;font-size:20px;color:var(--ink)}.release-stamp{text-align:center;color:#9aa9a6;font-size:11px;letter-spacing:.08em;margin:34px 0 5px}#toast{position:fixed;z-index:90;bottom:25px;left:50%;transform:translateX(-50%) translateY(25px);padding:10px 16px;background:#173b47;color:#fff;border-radius:10px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.2s;max-width:90vw;text-align:center;font-size:13px}#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:940px){.rail{width:200px;min-width:200px}.span-4,.span-5{grid-column:span 6}.span-7,.span-8{grid-column:span 12}}
@media(max-width:700px){.rail{display:none}.topbar{height:72px;padding:0 17px}.topbar-kicker{font-size:9px}.topbar-title{font-size:17px}.topbar-title span{display:none}.mobile-logo{display:grid;place-items:center;width:35px;height:35px;border-radius:10px;background:var(--ink);font-size:17px;color:#fff}.grade-picker{padding:6px}.grade-picker span{display:none}.grade-picker select{font-size:12px}.sync-indicator{display:none}main{padding:20px 16px calc(94px + env(safe-area-inset-bottom));min-height:calc(100dvh - 72px)}.grid{gap:12px}.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 12}.card{padding:18px;border-radius:17px}.hero{padding:24px;min-height:250px}.hero:after{right:-175px}.hero h1{font-size:35px}.section-head{margin-top:25px}.mobile-nav{position:fixed;z-index:30;bottom:0;left:0;right:0;display:grid;grid-template-columns:repeat(5,1fr);padding:7px 5px calc(8px + env(safe-area-inset-bottom));background:rgba(255,254,250,.97);border-top:1px solid var(--line);backdrop-filter:blur(12px)}.mobile-nav button{border:0;background:none;color:#829394;padding:5px 1px;min-height:51px;display:grid;place-items:center;gap:1px;font-size:10px;font-weight:700}.mobile-nav button.active{color:var(--ink)}.mobile-nav .nav-icon{font-size:19px}.modal{max-height:88dvh}.modal-inner{max-height:88dvh;padding:19px}#toast{bottom:calc(80px + env(safe-area-inset-bottom))}.two-col{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}