*{box-sizing:border-box} :root{--bg:#f6f5f0;--paper:#fff;--ink:#202d29;--muted:#69746e;--line:#dce2da;--green:#21694f;--light:#e9f1e8;--red:#a63c34;--yellow:#fff3d8;--shadow:0 8px 30px #1c3b2410}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;padding-bottom:105px}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--green)}:focus-visible{outline:3px solid #ae7fdb;outline-offset:4px}.topbar{max-width:1080px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:24px 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/* Светлая тема: тёмным остаётся текст, а не крупные поверхности. */
:root{color-scheme:light;--bg:#fffefb;--paper:#fff;--ink:#29394a;--muted:#566878;--line:#dae4ed;--green:#245d74;--light:#eff8f8;--red:#94423b;--yellow:#fff8e8;--shadow:0 6px 24px #456c8207}
body{background:#fffefb;overflow-wrap:anywhere}.topbar{background:#fffefb}.brand-icon{background:#e7f4fa;color:#245d74}.bottom-nav{background:#fffffffa}.bottom-nav a[aria-current=page]{background:#edf7fc;color:#245d74}
.start-card{background:#f0f8fd;color:var(--ink);border:1px solid #d6e7f2;box-shadow:none}.start-card .small,.start-card .eyebrow{color:#43697c}.start-card .btn{background:#dff0fb;color:#204f66;border-color:#b8d7e8}.progress-ring{background:conic-gradient(#92c7dc calc(var(--value)*1%),#e1edf1 0)}.progress-ring:before{background:#f0f8fd}
.btn{background:#e2f2f8;color:#244f64;border-color:#b9d8e5}.btn.secondary{background:#fff;color:#33546a}.btn.ghost{color:#335f75}.btn.danger{background:#fff0ed;color:#863b34;border-color:#e2b6b0}.tabs button.active{background:#e6f2fa;color:#264e69}.callout{background:#f1f9f7;border-left-color:#83b6aa}.feedback{background:#edf8f1}.feedback.wrong{background:#fff7e9}.timer-bar{background:#edf6fb;color:#2b526a;border:1px solid #c9dfec;box-shadow:none}.timer-bar.over{background:#fff4e2;color:#755326}
pre{background:#f5f8ff;color:#294563;border:1px solid #dce5f2;font-size:14px;line-height:1.8}.option{font-size:17px}.option span{min-width:0;overflow-wrap:anywhere}.option b{flex-shrink:0;background:#f2f6fa}.option.correct{background:#eff9f2;border-color:#7daf91}.option.incorrect{background:#fff7ed;border-color:#cfad80}
.easy-home{padding-top:26px;max-width:650px}.easy-home h1{font-size:clamp(33px,5vw,47px);line-height:1.17}.easy-home .start-card{margin:26px 0 20px}.easy-home .start-card h2{max-width:none;font-size:25px;margin-top:14px}.easy-home .start-card p{font-size:17px}.memory-method{display:flex;justify-content:space-between;gap:10px;font-size:14px;color:#496779;padding:14px 0}.easy-home details .btn{width:100%;margin-bottom:9px}.easy-screen{max-width:650px}.easy-top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:4px 0 16px}.easy-card{padding:28px;margin-top:0;box-shadow:none}.easy-card h1{font-size:30px;line-height:1.25;letter-spacing:-.025em}.easy-card .question{font-size:25px;line-height:1.4}.easy-explanation{font-size:19px;line-height:1.75}.easy-card .btn{width:100%}.easy-card .small{margin-top:15px;margin-bottom:0;font-size:13px}.remember{background:#fff9e9;border:1px solid #ece0b9;border-radius:14px;padding:20px;margin:22px 0}.remember span{display:block;color:#776335;font-size:12px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:7px}.remember strong{display:block;font-size:19px;line-height:1.5;font-weight:650}.easy-card .callout{font-size:18px}.easy-card .feedback{font-size:18px}.table-wrap{margin:20px 0;border:1px solid #d7e6ed;border-radius:14px;overflow:hidden}table{width:100%;border-collapse:collapse;text-align:left;font-size:18px}th{background:#eef7fb;font-size:15px;color:#47657a;font-weight:600}td,th{padding:13px 17px}tbody tr+tr{border-top:1px solid #e5edf0}.easy-card .diagram{justify-content:flex-start}.easy-card .diagram span{background:#f1f7fc;font-size:16px}.easy-card .detail-body p{margin-bottom:18px;line-height:1.7}.easy-card .detail-body p:last-child{margin:0}
@media(max-width:650px){.easy-home{padding-top:20px}.easy-home h1{font-size:34px}.easy-card{padding:21px}.easy-card h1{font-size:27px}.easy-card .question{font-size:23px}.easy-explanation{font-size:18px;line-height:1.7}.easy-top .small{font-size:12px}.easy-top .pill{font-size:11px}.easy-card pre{font-size:13px}.remember{padding:17px}.remember strong{font-size:18px}.memory-method{font-size:13px}.easy-home .start-card h2{font-size:23px}}
/* Письмо по образцу: светлый экран и удобный ввод с телефона. */
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.dict-screen{padding-top:24px}.dict-screen h1{font-size:30px}.dict-guide{margin:18px 0;padding:20px}.dict-instruction{font-size:17px;line-height:1.5}.dict-target{display:block;width:fit-content;max-width:100%;overflow-wrap:anywhere;background:#fff4cf;padding:8px 12px;border-radius:10px;font:22px/1.4 ui-monospace,monospace}.dict-editor{display:block;width:100%;min-height:230px;border:2px solid #9bbdcb;border-radius:14px;background:#fbfdff;color:#203c4c;padding:14px;font:16px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:4;resize:vertical;white-space:pre-wrap;overflow-wrap:anywhere}.dict-editor[aria-invalid=true]{border-color:#b86933}.dict-check{min-height:48px;font-size:16px;line-height:1.5}.dict-keys{margin-top:10px}.dict-screen [hidden]{display:none!important}.dict-screen .actions{gap:10px;flex-wrap:wrap}
.line-card{margin-top:20px}.line-sample{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.7}.line-explanation{font-size:18px;line-height:1.6}.line-parts{padding:4px 16px;background:#f7fafc;border-radius:12px;margin-bottom:18px}.line-parts p{font-size:15px;line-height:1.6}.line-editor{min-height:104px;margin-top:8px}.line-editor:disabled{opacity:1;color:#24553e;background:#f4fbf6}

.code-tiles{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}.code-tiles button{min-height:52px;padding:13px 16px;border:1px solid #b9d3e0;border-radius:12px;background:#edf7fc;color:#233f50;font:17px/1.3 ui-monospace,monospace;overflow-wrap:anywhere;max-width:100%;touch-action:manipulation}.code-tiles button:active{background:#d0eafb}.line-editor[readonly]{background:#f5fafc;min-height:78px}.line-breakdown{margin-bottom:12px}.dict-screen h1{font-size:26px}.line-card{padding:18px}.line-card .line-explanation{font-size:16px;margin:12px 0}

.answer-screen{padding-top:24px}.answer-plan{padding-left:24px}.answer-plan li{margin:12px 0}.answer-editor{width:100%;min-height:240px;font-size:16px;line-height:1.65;tab-size:4;overflow:auto}.answer-hint{margin-top:20px;padding-top:16px;border-top:1px solid #e5e5da}.answer-hint[hidden]{display:none}.answer-explanation{margin:20px 0}.answer-work .type-keys{flex-wrap:wrap}.answer-work .type-keys button{min-width:44px;min-height:44px}.answer-screen pre{max-width:100%;overflow-x:auto}