:root{--bg:#f6f6f4;--card:#fff;--text:#0a0a0a;--muted:#6f6f6a;--line:#e5e5df;--soft:#efefeb;--dark:#0a0a0a;--success-bg:#ecfdf3;--success-line:#bbf7d0;--success-text:#166534;--danger-bg:#fef2f2;--danger-line:#fecaca;--danger-text:#991b1b;--shadow:0 10px 30px rgba(10,10,10,.06);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}html{min-height:100%;background:var(--bg)}body{margin:0;min-height:100%;color:var(--text);background:radial-gradient(circle at 20% 0%,rgba(255,255,255,.9),transparent 28rem),linear-gradient(180deg,#fbfbf9 0%,var(--bg) 100%)}button,input{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}.app{width:min(100%,480px);min-height:100svh;margin:0 auto;padding:18px 16px calc(86px + env(safe-area-inset-bottom))}.header{background:var(--card);border:1px solid var(--line);border-radius:32px;padding:22px;box-shadow:var(--shadow)}.header-top{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.eyebrow{margin:0 0 6px;color:var(--muted);font-size:14px;font-weight:650}h1{margin:0;letter-spacing:-.045em;line-height:.98;font-size:clamp(30px,9vw,42px)}.logo{width:46px;height:46px;border-radius:18px;display:grid;place-items:center;color:#fff;background:var(--dark);flex:none}.logo svg{width:24px;height:24px}.progress-wrap{margin-top:22px}.progress-label{display:flex;justify-content:space-between;margin-bottom:8px;color:var(--muted);font-size:13px;font-weight:650}.progress{height:8px;overflow:hidden;border-radius:999px;background:var(--soft)}.progress>div{height:100%;width:0;border-radius:inherit;background:var(--dark);transition:width .35s ease}.nav-scroll{display:flex;gap:9px;overflow-x:auto;padding:14px 1px;scrollbar-width:none}.nav-scroll::-webkit-scrollbar,.category-scroll::-webkit-scrollbar{display:none}.nav-btn,.pill,.toggle,.primary,.secondary{border-radius:999px;background:var(--card);color:#575750;border:1px solid var(--line);font-weight:700;transition:transform .15s ease,background .15s ease,color .15s ease,border-color .15s ease}.nav-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 15px;white-space:nowrap;font-size:14px}.nav-btn.active,.pill.active,.toggle.active{background:var(--dark);color:#fff;border-color:var(--dark)}.nav-btn:active,.pill:active,.primary:active,.secondary:active,.toggle:active{transform:scale(.98)}.nav-btn svg{width:17px;height:17px}.filters{display:grid;gap:10px;margin-bottom:16px}.search{position:relative}.search svg{position:absolute;left:15px;top:50%;width:18px;height:18px;transform:translateY(-50%);color:#9a9a92}.search input{width:100%;min-height:48px;padding:12px 14px 12px 44px;border-radius:18px;border:1px solid var(--line);outline:none;background:var(--card);color:var(--text);font-weight:600}.search input:focus{border-color:var(--dark)}.category-scroll{display:flex;gap:8px;overflow-x:auto;padding:0 1px 4px;scrollbar-width:none}.pill{padding:9px 13px;white-space:nowrap;font-size:13px}.toggle{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:14px}.card-counter{display:flex;justify-content:space-between;margin:4px 2px 10px;color:var(--muted);font-size:13px;font-weight:650}.study-card{width:100%;min-height:330px;text-align:left;border:1px solid var(--line);border-radius:32px;background:var(--card);padding:24px;box-shadow:var(--shadow)}.badge{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:6px 10px;background:var(--soft);color:#55554e;font-size:12px;font-weight:800;margin-bottom:22px}.badge.dark{background:var(--dark);color:#fff}.question{margin:0;font-size:clamp(24px,7vw,32px);line-height:1.05;letter-spacing:-.04em;font-weight:780}.answer{margin:0;font-size:20px;line-height:1.45;letter-spacing:-.02em;font-weight:680}.hint{margin-top:30px;color:var(--muted);font-size:14px;font-weight:600}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.primary,.secondary{min-height:52px;padding:12px 16px;border-radius:18px;font-size:15px}.primary{background:var(--dark);color:#fff;border-color:var(--dark)}.secondary{background:var(--card);color:#33332f}.status-line,.panel{margin-top:12px;border-radius:20px;background:var(--card);border:1px solid var(--line);padding:15px;color:var(--muted);font-size:14px;font-weight:650}.quiz-question{border-radius:32px;background:var(--card);border:1px solid var(--line);padding:22px;box-shadow:var(--shadow)}.quiz-question h2{margin:0;font-size:22px;line-height:1.16;letter-spacing:-.035em}.options{display:grid;gap:10px;margin-top:12px}.option{width:100%;text-align:left;border-radius:18px;border:1px solid var(--line);background:var(--card);padding:15px;font-size:14px;font-weight:650;line-height:1.35}.option.correct{background:var(--success-bg);border-color:var(--success-line);color:var(--success-text)}.option.wrong{background:var(--danger-bg);border-color:var(--danger-line);color:var(--danger-text)}.option.dim{color:var(--muted)}.feedback{border-radius:20px;background:var(--card);border:1px solid var(--line);padding:15px;margin-top:12px}.feedback.success{color:var(--success-text);background:var(--success-bg);border-color:var(--success-line)}.feedback.danger{color:var(--danger-text);background:var(--danger-bg);border-color:var(--danger-line)}.feedback p{margin:8px 0 0;color:inherit;line-height:1.4}.plan-list,.stats{display:grid;gap:12px}.plan-item,.stat-card{border-radius:24px;background:var(--card);border:1px solid var(--line);padding:18px}.plan-meta{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.plan-item h3,.stat-card h3{margin:4px 0 0;letter-spacing:-.025em}.plan-item p,.stat-card p{color:var(--muted);margin:10px 0 0;line-height:1.45}.tag{white-space:nowrap;border-radius:999px;background:var(--soft);color:var(--muted);padding:6px 10px;font-size:12px;font-weight:800}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.stat-card .label{color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.06em}.stat-card .value{margin-top:8px;font-size:30px;letter-spacing:-.04em;font-weight:780}.empty{border-radius:24px;background:var(--card);border:1px solid var(--line);padding:28px;text-align:center;color:var(--muted);font-weight:650}.bottom-space{height:12px}.hidden{display:none!important}@media(min-width:760px){.app{padding-top:28px}.study-card{min-height:360px}}