:root{
  --blue:#2f83ea;--blue-h:#2774d1;--blue-t:#2f83ea1a;
  --green:#34c759;--red:#ff3b30;--red-t:#ff3b3014;--orange:#ff9f0a;--purple:#b770ff;
  --bg:#f2f2f7;--card:#fff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--soft:#f6f7fa;
  --shadow:0 1px 2px rgba(17,24,39,.04),0 6px 20px rgba(17,24,39,.05);
}
@media (prefers-color-scheme:dark){:root:not(.light){--bg:#0f1115;--card:#181b21;--text:#f3f4f6;--muted:#9aa3af;--line:#2a2f37;--soft:#20242b;--blue-t:#2f83ea2b;--shadow:none}}
:root.dark{--bg:#0f1115;--card:#181b21;--text:#f3f4f6;--muted:#9aa3af;--line:#2a2f37;--soft:#20242b;--blue-t:#2f83ea2b;--shadow:none}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--text);font:15px/1.45 Inter,system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
.app{max-width:560px;margin:0 auto;padding:12px 16px 24px;min-height:100vh}

.head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:4px 0 14px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:34px;height:34px}
.brand b{display:block;font-size:17px;font-weight:750;letter-spacing:-.01em;line-height:1.1}
.brand span{font-size:13px;color:var(--muted)}
.limit{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--muted);background:var(--card);border:1px solid var(--line);padding:6px 10px;border-radius:999px;white-space:nowrap}
.limit b{color:var(--text)}
.limit .sep{width:1px;height:12px;background:var(--line)}
.limit .plus{display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--blue);color:#fff;font-size:14px;line-height:1;margin-left:2px}
.star{width:13px;height:13px;color:#f5b301;flex:none;vertical-align:-2px}

.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--line);padding:3px;border-radius:12px;margin-bottom:18px}
.tab{height:34px;border-radius:9px;font-weight:600;font-size:14px;color:var(--muted);transition:.15s}
.tab.on{background:var(--card);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08)}

.screen{display:none}
.screen.on{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.field{margin-bottom:16px;min-width:0}
.field>label{display:block;font-weight:650;font-size:13px;margin:0 0 7px;color:var(--text)}
.field>label small{font-weight:500;color:var(--muted);margin-left:4px}
input,select,textarea{width:100%;background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;outline:none;transition:border-color .15s;font-size:16px}
textarea{resize:vertical;min-height:110px;line-height:1.45}
input:focus,select:focus,textarea:focus{border-color:var(--blue)}
select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='m1 1 5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:34px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.row2>.field:only-child{grid-column:1/-1}

.seg{display:flex;background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:3px;gap:2px}
.seg button{flex:1;height:36px;border-radius:9px;font-weight:600;font-size:14px;color:var(--muted);transition:.15s;white-space:nowrap;padding:0 6px;min-width:0}
.seg button.on{background:var(--blue);color:#fff}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{height:36px;padding:0 14px;border-radius:999px;border:1.5px solid var(--line);background:var(--card);font-weight:600;font-size:14px;color:var(--muted);transition:.15s}
.chips button.on{border-color:var(--blue);background:var(--blue-t);color:var(--blue)}
.sugg{display:flex;gap:6px;overflow-x:auto;margin-top:8px;padding-bottom:2px;scrollbar-width:none}
.sugg::-webkit-scrollbar{display:none}
.sugg button{flex:none;font-size:13px;font-weight:500;padding:5px 11px;border-radius:999px;background:var(--soft);border:1px solid var(--line);color:var(--muted)}

.more{background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:0 14px;margin-bottom:16px}
.more summary{list-style:none;cursor:pointer;padding:13px 0;font-weight:650;font-size:14px;display:flex;align-items:center;gap:8px}
.more summary::-webkit-details-marker{display:none}
.more summary span{font-weight:500;color:var(--muted);font-size:13px;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.more summary:after{content:"";width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);margin:-4px 4px 0 0;transition:.2s}
.more[open] summary:after{transform:rotate(-135deg);margin-top:4px}
.more .field input,.more .field select,.more .field textarea{background:var(--soft)}

.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;height:46px;border-radius:13px;font-weight:650;font-size:15px;transition:background .15s,transform .1s,opacity .15s}
.btn:active{transform:scale(.98)}
.btn.big{height:52px;font-size:16px}
.btn.primary{background:var(--blue);color:#fff}
.btn.primary:hover{background:var(--blue-h)}
.btn.primary:disabled{opacity:.55;cursor:default}
.btn.soft{background:var(--blue-t);color:var(--blue)}
.btn.ghost{background:var(--card);border:1.5px solid var(--line)}
.btn.link{color:var(--blue);height:40px}
.cta-pad{height:96px}
.cta{position:fixed;left:0;right:0;bottom:0;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 30%);z-index:5}
.cta .btn{max-width:528px;margin:0 auto;box-shadow:0 8px 24px #2f83ea40}
.cta-hint{max-width:528px;margin:7px auto 0;text-align:center;font-size:12.5px;color:var(--muted);min-height:16px}
.cta-hint a{color:var(--blue);font-weight:600;text-decoration:none;cursor:pointer}
.err{background:var(--red-t);color:var(--red);border-radius:12px;padding:10px 12px;font-size:14px;font-weight:500;margin-bottom:12px}

/* generation */
.gen{text-align:center;padding:48px 8px 24px}
.orb{width:120px;height:120px;margin:0 auto 26px;border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle,#b770ff22,transparent 70%);position:relative}
.orb:before,.orb:after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid #2f83ea33;animation:ring 2.4s ease-out infinite}
.orb:after{animation-delay:1.2s}
.orb img{width:64px;height:64px;animation:breath 2.4s ease-in-out infinite}
@keyframes ring{from{transform:scale(.7);opacity:1}to{transform:scale(1.35);opacity:0}}
@keyframes breath{50%{transform:scale(1.08) rotate(-6deg)}}
.gen h2{margin:0 0 6px;font-size:22px;letter-spacing:-.015em}
.gen-step{color:var(--muted);margin:0 0 20px;min-height:21px;transition:opacity .3s}
.prog{height:6px;border-radius:6px;background:var(--line);overflow:hidden;max-width:300px;margin:0 auto}
.prog i{display:block;height:100%;width:3%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:6px;transition:width .8s ease}
.gen-time{font-size:13px;color:var(--muted);margin:10px 0 28px;font-variant-numeric:tabular-nums}
.gen-note{font-size:13px;color:var(--muted);background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px;max-width:340px;margin:0 auto}

/* done */
.done{display:flex;flex-direction:column;gap:10px;padding-top:4px}
.done-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.back-link{display:none;color:var(--blue);font-weight:600;font-size:14px;padding:4px 0}
.from-history .back-link{display:block}
.from-history .done-badge{color:var(--muted);background:var(--soft)}
.done-badge{align-self:flex-start;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#1f9d45;background:#34c7591f;padding:5px 10px;border-radius:999px}
.lesson-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow);margin-bottom:6px;position:relative;overflow:hidden}
.lesson-card:after{content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;background:url(/static/helgio.png) center/contain no-repeat;opacity:.08}
.lesson-card h2{margin:10px 0 6px;font-size:22px;line-height:1.15;letter-spacing:-.02em}
.lesson-card p{margin:0;color:var(--muted)}
.lc-chips{display:flex;flex-wrap:wrap;gap:6px}
.lc-chips span{font-size:12px;font-weight:600;padding:3px 9px;border-radius:999px;background:var(--soft);color:var(--muted)}
.lc-chips span:first-child{background:var(--blue);color:#fff}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}

/* history */
.h-item{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:8px;width:100%;text-align:left}
.h-lvl{flex:none;width:40px;height:40px;border-radius:11px;background:var(--blue-t);color:var(--blue);display:grid;place-items:center;font-weight:750;font-size:14px}
.h-main{flex:1;min-width:0}
.h-main b{display:block;font-size:15px;font-weight:700;line-height:1.35;overflow-wrap:anywhere}
.h-main>span{display:block;color:var(--muted);font-size:13px;margin-top:4px;line-height:1.4;overflow-wrap:anywhere}
.h-arrow{width:8px;height:8px;border-right:2px solid var(--muted);border-top:2px solid var(--muted);transform:rotate(45deg);flex:none;margin:0 3px 0 5px}
.history-search{display:flex;align-items:center;gap:10px;padding:0 12px;background:var(--card);border:1px solid var(--line);border-radius:13px;min-height:48px}
.history-search:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-t)}
.history-search>svg{width:20px;height:20px;flex:none;color:var(--muted)}
.history-search input{min-width:0;flex:1;border:0;background:transparent;box-shadow:none!important;outline:0;border-radius:0;padding:12px 0;font:inherit;font-size:15px;color:var(--text)}
.history-search input::-webkit-search-cancel-button{-webkit-appearance:none}
.history-search input::placeholder{color:var(--muted);opacity:1}
.history-search>button{width:32px;height:40px;flex:none;font-size:25px;color:var(--muted);border-radius:8px}
.history-levels{display:flex;gap:6px;margin:12px 0 0;overflow-x:auto;padding:1px 1px 5px;scrollbar-width:thin}
.history-levels button{flex:none;min-height:40px;padding:7px 12px;border-radius:10px;font-size:13px;font-weight:600;background:var(--card);color:var(--muted);border:1px solid var(--line);white-space:nowrap}
.history-levels button[aria-pressed=true]{background:var(--blue-t);color:var(--blue);border-color:var(--blue)}
.history-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:43px;margin:0 1px 5px;color:var(--muted);font-size:12px;line-height:1.5}
.history-meta>button{color:var(--blue);font-size:12px;font-weight:600;min-height:40px;text-align:right}
.history-pages{display:flex;align-items:center;justify-content:center;gap:4px;margin:22px 0 12px;padding-bottom:12px}
.history-pages[hidden],#histClear[hidden],#histReset[hidden]{display:none!important}
.history-pages button{width:36px;min-height:44px;border:1px solid var(--line);border-radius:10px;font-size:14px;font-weight:600;background:var(--card);color:var(--text)}
.history-pages button:first-child,.history-pages button:last-child{font-size:25px}
.history-pages button[aria-current=page]{background:var(--blue);border-color:var(--blue);color:#fff}
.history-pages button:disabled{opacity:.35;cursor:default}
.history-pages .history-ellipsis{font-size:13px;width:14px;text-align:center;color:var(--muted)}
.history-empty{padding:40px 12px}
.history-empty-title{font-size:17px;font-weight:700;color:var(--text)}
.history-empty p{font-size:14px;line-height:1.6;max-width:320px;margin:10px auto 16px}
.history-empty .btn{width:auto;display:inline-flex;padding-inline:18px}
.history-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
#hist[aria-busy=true] .h-item{pointer-events:none;opacity:.6}
.history-search button:focus-visible,.history-levels button:focus-visible,.history-pages button:focus-visible,.history-meta button:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
@media(max-width:380px){.history-pages button{width:30px}.history-pages{gap:3px}.history-levels button{padding-inline:10px}.history-meta{font-size:12px;gap:8px}}
@media(prefers-reduced-motion:reduce){.skel{animation:none}}
.empty{text-align:center;color:var(--muted);padding:50px 20px}
.empty img{width:48px;opacity:.5;margin-bottom:10px}
.skel{height:66px;border-radius:14px;margin-bottom:8px;background:linear-gradient(90deg,var(--card),var(--soft),var(--card));background-size:200% 100%;animation:sk 1.2s infinite}
@keyframes sk{to{background-position:-200% 0}}

.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(10px);background:var(--text);color:var(--bg);padding:10px 16px;border-radius:12px;font-size:14px;font-weight:600;opacity:0;transition:.25s;pointer-events:none;z-index:50;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (max-width:360px){.seg button{font-size:13px}.row2{grid-template-columns:1fr}}

/* shop */
.back-link.show{display:block;margin-bottom:6px}
.shop-head h2{font-size:24px;letter-spacing:-.02em;margin:4px 0 6px}
.shop-head p{color:var(--muted);margin:0 0 16px}
.shop-head p b{color:var(--text)}
.shop-banner{background:#ff9f0a1f;color:#b26a00;border-radius:12px;padding:10px 12px;font-size:14px;font-weight:500;margin-bottom:12px}
:root.dark .shop-banner{color:#ffb340}
.packs{display:flex;flex-direction:column;gap:10px}
.pack{position:relative;display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--line);border-radius:16px;padding:14px 14px 14px 16px;transition:border-color .15s,transform .1s}
.pack:active{transform:scale(.99)}
.pack.hot{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-t)}
.pack .n{flex:none;width:54px;text-align:center}
.pack .n b{display:block;font-size:26px;font-weight:800;letter-spacing:-.02em;line-height:1}
.pack .n span{font-size:12px;color:var(--muted);font-weight:600}
.pack .mid{flex:1;min-width:0}
.pack .mid .t{font-weight:650;font-size:15px}
.pack .mid .s{font-size:13px;color:var(--muted)}
.pack .price{flex:none;display:flex;align-items:center;gap:5px;height:38px;padding:0 12px;border-radius:11px;background:var(--blue);color:#fff;font-weight:700;font-size:15px}
.pack .price .star{color:#ffd60a;width:15px;height:15px}
.pack .tag{position:absolute;top:-9px;right:14px;font-size:10.5px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;padding:3px 8px;border-radius:999px;background:var(--blue);color:#fff}
.pack .tag.green{background:var(--green)}
.pack[disabled]{opacity:.6}
.shop-note{font-size:12.5px;color:var(--muted);margin:14px 2px 6px;line-height:1.45}
.shop-balance{font-size:13px;color:var(--muted);text-align:center;margin-top:10px}
.shop-balance b{color:var(--text)}

.field-hint{font-size:12.5px;color:var(--muted);margin:-8px 0 16px;line-height:1.4}