:root{--bg:#f4f6f4;--surface:#fff;--ink:#14211e;--muted:#6b7773;--line:#e0e7e3;--green:#0e493c;--green-2:#173b33;--mint:#e4f2eb;--orange:#ed6a3a;--orange-soft:#fff0e9;--red:#b94d3c;--shadow:0 20px 60px rgba(19,55,45,.09);--radius:22px;--font:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--display:"Segoe UI",Inter,ui-sans-serif,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased}.hidden{display:none!important}button,input,textarea{font:inherit}.logo{width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,#ff8455,var(--orange));color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px;letter-spacing:-.3px;box-shadow:0 10px 22px rgba(6,29,23,.25),inset 0 0 0 1px #ffffff4d}.auth-screen{min-height:100vh;background:radial-gradient(circle at 15% 20%,#1f5548 0,transparent 27%),linear-gradient(135deg,#0a2923,#103c32);color:#fff;padding:34px clamp(24px,5vw,76px)}.auth-brand,.brand{display:flex;align-items:center;gap:13px}.auth-brand strong,.brand strong{display:block;font-size:17px}.auth-brand small,.brand small{display:block;color:#9eb9b2;font-size:11px;margin-top:3px}.auth-layout{min-height:calc(100vh - 112px);display:grid;grid-template-columns:minmax(0,1.25fr) minmax(340px,470px);align-items:center;gap:8vw;max-width:1260px;margin:auto}.auth-copy{max-width:680px}.kicker{color:var(--orange);font-size:10px;font-weight:800;letter-spacing:1.8px}.kicker.light{color:#ff9a71}.auth-copy h1{font-family:var(--display);font-size:clamp(48px,6.2vw,82px);line-height:.99;letter-spacing:-4px;margin:18px 0 28px}.auth-copy>p{font-size:18px;line-height:1.75;color:#bbcec8;max-width:640px}.auth-points{display:flex;gap:30px;margin-top:45px}.auth-points span{font-size:10px;color:#76a093}.auth-points b{display:block;color:#dfeae6;font-size:12px;margin-top:8px}.auth-card{background:#fff;color:var(--ink);border-radius:26px;padding:12px 32px 32px;box-shadow:0 40px 100px #03110e66}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:26px}.auth-tabs button{border:0;background:none;padding:18px 8px 15px;color:var(--muted);font-weight:700;font-size:13px;border-bottom:2px solid transparent;cursor:pointer}.auth-tabs button.active{color:var(--green);border-color:var(--orange)}.auth-form{display:grid;gap:16px}.auth-form label,.dialog-card label{font-weight:700;font-size:12px}.auth-form input,.dialog-card input,.admin-dialog textarea{display:block;width:100%;margin-top:8px;border:1px solid var(--line);border-radius:13px;padding:13px 14px;background:#f8faf9;color:var(--ink);outline:none}.auth-form input:focus,.dialog-card input:focus,.admin-dialog textarea:focus{border-color:#8fb2a7;box-shadow:0 0 0 3px #dcece688}.auth-form label small{color:var(--muted);font-weight:500}.btn{border:0;border-radius:12px;padding:13px 18px;font-weight:750;font-size:13px;cursor:pointer}.btn.primary{background:var(--orange);color:#fff;box-shadow:0 10px 22px #a6412038}.btn.subtle{background:var(--bg);color:var(--ink);border:1px solid var(--line)}.btn.danger{background:#f9e7e3;color:var(--red)}.form-error{min-height:18px;margin:0;color:var(--red);font-size:12px;line-height:1.5}.app{min-height:100vh;display:grid;grid-template-columns:300px 1fr}.sidebar{position:sticky;top:0;height:100vh;background:linear-gradient(180deg,#123f35,#0a2c25);color:#fff;padding:29px 22px 21px;display:flex;flex-direction:column;z-index:30}.brand{padding:0 7px 24px}.profile{display:grid;grid-template-columns:35px 1fr auto;gap:10px;align-items:center;border:1px solid #ffffff18;background:#ffffff0a;color:#fff;padding:10px;border-radius:14px;text-align:left;cursor:pointer}.profile:hover{background:#ffffff11}.profile>span{width:35px;height:35px;border-radius:10px;background:#ffffff13;display:grid;place-items:center;font-weight:800;font-size:11px}.profile small{display:block;color:#86a79e;font-size:8px;font-weight:800;letter-spacing:1.3px}.profile strong{display:block;font-size:12px;margin-top:3px}.search{display:flex;align-items:center;gap:9px;border:1px solid #ffffff17;background:#ffffff0a;border-radius:13px;padding:11px 12px;margin:14px 0 22px}.search input{border:0;outline:0;background:none;color:#fff;width:100%;font-size:12px}.search input::placeholder{color:#9fb8b1}.nav-label{font-weight:800;font-size:9px;letter-spacing:1.8px;color:#779990;padding:0 9px 9px}#lesson-list{display:grid;gap:6px;overflow:auto}.lesson-link{border:0;background:none;color:#d1dfdb;padding:11px;border-radius:13px;display:grid;grid-template-columns:9px 1fr auto;gap:11px;align-items:center;text-align:left;cursor:pointer}.lesson-link:hover{background:#ffffff0b}.lesson-link.active{background:#fff;color:var(--ink);box-shadow:0 12px 30px #061b175c}.lesson-link i{width:8px;height:8px;border-radius:50%;background:#63867c}.lesson-link.done i{background:#58b384;box-shadow:0 0 0 3px #58b3841f}.lesson-link strong{font-size:12px}.lesson-link small{display:block;color:#82958f;font-size:9px;margin-top:4px}.lesson-link em{font-style:normal;color:var(--orange);font-size:10px;font-weight:800}.admin-link{margin-top:15px;border:1px dashed #ffffff24;background:none;color:#a9c0ba;padding:10px;border-radius:12px;font-size:11px;cursor:pointer}.sidebar-progress{margin-top:auto;border-top:1px solid #ffffff17;padding:18px 8px 2px}.sidebar-progress>div{display:flex;justify-content:space-between;color:#adc2bc;font-size:10px}.sidebar-progress i{display:block;height:5px;background:#ffffff14;border-radius:10px;margin-top:10px;overflow:hidden}.sidebar-progress b{display:block;width:0;height:100%;background:var(--orange);border-radius:10px;transition:.35s}.topbar{height:74px;position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:0 44px;border-bottom:1px solid var(--line);background:#f4f6f4e8;backdrop-filter:blur(14px)}.crumb{font-size:9px;font-weight:800;letter-spacing:1.5px;color:#8a9692}.crumb span{padding:0 10px;color:#bac1be}.crumb b{color:var(--green)}.top-actions{display:flex;align-items:center;gap:10px}.saved{font-size:9px;color:#87938f}.round,.mobile-menu,.user-badge{border:1px solid var(--line);background:var(--surface);color:var(--ink);width:38px;height:38px;border-radius:12px;cursor:pointer}.user-badge{border:0;border-radius:50%;background:var(--orange-soft);color:#9f4524;font-size:10px;font-weight:800}.mobile-menu{display:none}.content{max-width:1020px;margin:0 auto;padding:58px 42px 110px}.loader,.empty{text-align:center;color:var(--muted);padding:100px 20px}.lesson-hero{padding-bottom:38px;border-bottom:1px solid var(--line)}.date{display:flex;align-items:center;gap:9px;color:var(--orange);font-size:10px;font-weight:800;letter-spacing:1.7px}.date:before{content:"";width:27px;height:2px;background:var(--orange)}h1{font-family:var(--display);font-size:clamp(40px,5vw,64px);line-height:1.04;letter-spacing:-2.8px;margin:18px 0 20px}h2{font-family:var(--display);letter-spacing:-.7px}.lead{font-size:17px;line-height:1.75;color:var(--muted);max-width:760px}.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}.chip{background:var(--mint);color:var(--green);padding:8px 12px;border-radius:99px;font-size:10px;font-weight:800}.chip.warm{background:var(--orange-soft);color:#a44a28}.lesson-section{padding-top:52px}.section-title{font-size:30px;margin:9px 0 23px}.story{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}.story:after{content:"“";position:absolute;right:22px;top:-19px;font:100px Georgia;color:var(--orange-soft)}.story p{font-size:17px;line-height:1.85;margin:0;position:relative;z-index:1}.explain{font-size:16px;line-height:1.85;color:#33423d}.explain p{margin:0 0 16px}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.concept,.example{background:var(--surface);border:1px solid var(--line);border-radius:17px;padding:23px}.concept small,.example small{font-size:9px;font-weight:800;letter-spacing:1.3px;color:var(--orange)}.concept h3,.example h3{font-size:16px;margin:8px 0}.concept p,.example p{font-size:13px;line-height:1.65;color:var(--muted);margin:0}.exam-focus{border-left:3px solid var(--orange);background:var(--orange-soft);padding:18px 20px;border-radius:0 14px 14px 0;margin-top:20px;font-size:14px;line-height:1.65}.remember{background:linear-gradient(135deg,#104b3e,#0b382f);color:#fff;border-radius:var(--radius);padding:34px}.remember h2{margin:7px 0 15px}.remember li{color:#d1e2dd;padding:6px 0;line-height:1.6}.exam-gate{display:flex;align-items:center;justify-content:space-between;gap:25px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:var(--shadow)}.exam-gate p{color:var(--muted);margin:5px 0 0}.exam-shell{display:none;scroll-margin-top:95px}.exam-shell.show{display:block}.exam-status{display:flex;align-items:center;gap:16px;margin:30px 0 12px;font-size:9px;font-weight:800;letter-spacing:1.4px;color:var(--muted)}.exam-status i{height:5px;background:var(--line);border-radius:10px;flex:1;overflow:hidden}.exam-status b{display:block;height:100%;background:var(--orange);border-radius:10px}.question-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:30px}.question-card h2{font-size:21px;line-height:1.45;margin:0 0 20px}.answers{display:grid;gap:10px}.answer{border:1px solid var(--line);background:#fff;color:var(--ink);padding:15px 17px;border-radius:13px;text-align:left;cursor:pointer;line-height:1.5}.answer:hover{background:#f6faf8;border-color:#a8c1b8}.answer.wrong{background:#fae8e3;border-color:#df9b86;animation:shake .22s}.answer.correct{background:#e3f3e9;border-color:#76b68e}.feedback{display:none;margin-top:14px;padding:16px;border-radius:13px;background:var(--bg);font-size:13px;line-height:1.65}.feedback.show{display:block}.feedback em{display:block;color:var(--muted);margin-top:5px}.feedback .btn{margin-top:13px}.result{border-radius:22px;padding:32px}.result.passed{background:#e2f2e8}.result.failed{background:var(--orange-soft)}.result strong{display:block;font-size:52px;margin:9px 0}.result p{color:var(--muted);line-height:1.65}.result-actions{display:flex;gap:10px;margin-top:20px}.toast{position:fixed;right:22px;bottom:22px;background:#132f28;color:#fff;padding:13px 17px;border-radius:12px;font-size:12px;box-shadow:0 18px 50px #07171244;z-index:100}.dark{--bg:#10211d;--surface:#182b25;--ink:#f4f2eb;--muted:#a7b5b0;--line:#30463f;--mint:#23483c;--orange-soft:#563526;--shadow:0 20px 60px #06110e55}.dark .topbar{background:#10211de8}.dark .explain{color:#d3ded9}.dark .answer,.dark .question-card{background:var(--surface)}.dark .answer:hover{background:#203830}.dark .answer.wrong{background:#523229}.dark .answer.correct{background:#25483a}dialog{border:0;padding:0;border-radius:22px;max-width:460px;width:calc(100% - 30px);background:var(--surface);color:var(--ink);box-shadow:0 35px 100px #05100d66}dialog::backdrop{background:#061611b3;backdrop-filter:blur(4px)}.dialog-card{padding:32px}.dialog-card h2{font-size:27px;margin:8px 0 18px}.account-box{display:flex;align-items:center;gap:13px;background:var(--bg);padding:14px;border-radius:15px}.account-box>span{width:40px;height:40px;border-radius:12px;background:var(--orange-soft);color:var(--orange);display:grid;place-items:center;font-weight:800}.account-box small{display:block;color:var(--muted);margin-top:3px}.text-button{border:0;background:none;color:var(--green);font-weight:750;padding:17px 0;cursor:pointer}.password-panel{display:grid;gap:13px}.dialog-footer{display:flex;justify-content:flex-end;gap:9px;margin-top:23px}.admin-dialog{width:min(760px,calc(100vw - 30px))}.admin-dialog>p{font-size:13px;line-height:1.6;color:var(--muted)}.admin-dialog textarea{height:340px;resize:vertical;font:12px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace}@keyframes shake{25%{transform:translateX(-3px)}75%{transform:translateX(3px)}}
@media(max-width:850px){.auth-layout{grid-template-columns:1fr;gap:40px;padding:50px 0}.auth-copy h1{font-size:52px}.auth-points{display:none}.app{display:block}.sidebar{position:fixed;left:0;transform:translateX(-103%);width:min(86vw,320px);transition:.25s}.sidebar.open{transform:translateX(0)}.scrim.show{position:fixed;inset:0;background:#06161199;z-index:25}.mobile-menu{display:block}.topbar{height:64px;padding:0 17px}.crumb,.saved{display:none}.content{padding:34px 20px 85px}.grid{grid-template-columns:1fr}.story,.remember,.question-card{padding:23px}.exam-gate{align-items:flex-start;flex-direction:column}.exam-gate .btn{width:100%}.result-actions{flex-direction:column}.result-actions .btn{width:100%}}
@media(max-width:520px){.auth-screen{padding:22px 17px}.auth-layout{padding-top:35px}.auth-copy h1{font-size:42px;letter-spacing:-2.4px}.auth-copy>p{font-size:15px}.auth-card{padding:8px 20px 23px;border-radius:21px}.content{padding-left:17px;padding-right:17px}h1{font-size:40px;letter-spacing:-1.8px}.story p{font-size:15px}.lead{font-size:15px}}