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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>grU Trainer</title>
<link rel="manifest" href="manifest.json">
<meta name="theme-color" content="#0d1117">
<meta name="mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="apple-mobile-web-app-title" content="grU Trainer">
<link rel="apple-touch-icon" href="icon.svg">
<style>
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
--bg:#0d1117;--bg2:#161b22;--bg3:#21262d;
--border:#30363d;--text:#e6edf3;--sub:#8b949e;
--accent:#58a6ff;--accent-dim:rgba(88,166,255,.12);
--green:#3fb950;--green-dim:rgba(63,185,80,.12);
--red:#f85149;--red-dim:rgba(248,81,73,.12);
--yellow:#d29922;--yellow-dim:rgba(210,153,34,.12);
--shadow:rgba(0,0,0,.4);--r:12px;
}
html[data-theme="light"]{
--bg:#f6f8fa;--bg2:#ffffff;--bg3:#eaeef2;
--border:#d0d7de;--text:#1f2328;--sub:#57606a;
--accent:#0969da;--accent-dim:rgba(9,105,218,.1);
--green:#1a7f37;--green-dim:rgba(26,127,55,.1);
--red:#cf222e;--red-dim:rgba(207,34,46,.1);
--yellow:#7d4e00;--yellow-dim:rgba(125,78,0,.1);
--shadow:rgba(0,0,0,.08);
}
body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,'Segoe UI',sans-serif;min-height:100vh;transition:background-color .22s,color .22s}
.card,.q-card,.stat-box,.user-card,.ch-pill,.ans-btn,.hint-box,.summary-hero,.wrong-ticket,#toast{transition:background-color .22s,border-color .22s,color .22s}
.screen{display:none}.screen.active{display:block}
/* ── THEME TOGGLE ── */
#theme-btn{position:fixed;top:12px;right:12px;z-index:200;width:38px;height:38px;border-radius:50%;border:1.5px solid var(--border);background:var(--bg2);color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .22s,border-color .22s,transform .15s,box-shadow .22s;box-shadow:0 2px 10px var(--shadow);padding:0}
#theme-btn:hover{border-color:var(--accent);transform:scale(1.1)}
#theme-btn:active{transform:scale(.96)}
#theme-btn svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
#theme-btn .icon-sun{display:none}
#theme-btn .icon-moon{display:block}
html[data-theme="light"] #theme-btn .icon-sun{display:block}
html[data-theme="light"] #theme-btn .icon-moon{display:none}
/* ── LOADING ── */
#screen-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px;color:var(--sub)}
.spinner{width:44px;height:44px;border:4px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .75s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
/* ── LAYOUT ── */
.wrap{max-width:760px;margin:0 auto;padding:24px 16px}
/* ── BUTTONS ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 22px;border:1px solid transparent;border-radius:var(--r);cursor:pointer;font-size:.95rem;font-weight:600;transition:filter .12s,transform .1s,background-color .22s,border-color .22s,color .22s;user-select:none}
.btn:hover{filter:brightness(1.1);transform:translateY(-1px)}
.btn:active{transform:translateY(0);filter:brightness(.95)}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn-ghost:hover{background:var(--bg3);filter:none}
.btn-danger{background:transparent;color:var(--red);border-color:var(--red)}
.btn-danger:hover{background:var(--red-dim);filter:none}
.btn-success{background:var(--green);color:#fff}
.btn-struggling{background:var(--red-dim);color:var(--red);border:1.5px solid var(--red)}
.btn-struggling:hover{background:var(--red);color:#fff;filter:none}
.btn-due{background:var(--yellow-dim);color:var(--yellow);border:1.5px solid var(--yellow)}
.btn-due:hover{background:var(--yellow);color:#000;filter:none}
.btn-exam{background:var(--accent-dim);color:var(--accent);border:1.5px solid var(--accent)}
.btn-exam:hover{background:var(--accent);color:#fff;filter:none}
.btn-wide{width:100%;padding:14px 22px;font-size:1rem}
.btn:disabled{opacity:.4;pointer-events:none}
.card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:20px 24px;box-shadow:0 1px 3px var(--shadow)}
/* ── LOGIN ── */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:16px}
.login-box{width:100%;max-width:420px}
.login-hero{text-align:center;margin-bottom:32px}
.login-hero .icon{font-size:3.5rem;margin-bottom:12px;display:block}
.login-hero h1{font-size:1.9rem;font-weight:800;letter-spacing:-.02em}
.login-hero p{color:var(--sub);margin-top:6px;font-size:.92rem}
.input-wrap{position:relative;margin-bottom:14px}
.input-wrap input{width:100%;padding:14px 16px;background:var(--bg2);border:2px solid var(--border);border-radius:var(--r);color:var(--text);font-size:1.05rem;outline:none;transition:border-color .15s,background .22s,color .22s}
.input-wrap input:focus{border-color:var(--accent)}
.input-wrap input::placeholder{color:var(--sub)}
.divider{text-align:center;color:var(--sub);font-size:.8rem;margin:20px 0;position:relative}
.divider::before,.divider::after{content:'';position:absolute;top:50%;width:42%;height:1px;background:var(--border)}
.divider::before{left:0}.divider::after{right:0}
.user-list{display:flex;flex-direction:column;gap:8px;max-height:220px;overflow-y:auto}
.user-card{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);cursor:pointer;transition:border-color .13s,background .13s;box-shadow:0 1px 2px var(--shadow)}
.user-card:hover{border-color:var(--accent);background:var(--bg3)}
.user-avatar{width:38px;height:38px;border-radius:50%;background:var(--bg3);display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.user-info{flex:1;min-width:0}
.user-name{font-weight:600;font-size:.95rem}
.user-meta{font-size:.75rem;color:var(--sub);margin-top:2px}
.user-badge{font-size:.72rem;font-weight:700;padding:3px 8px;border-radius:20px;background:var(--accent-dim);color:var(--accent);white-space:nowrap}
/* ── HOME ── */
.home-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.home-title h1{font-size:1.5rem;font-weight:800;letter-spacing:-.02em}
.home-title p{color:var(--sub);font-size:.85rem;margin-top:2px}
.logout-btn{font-size:.8rem;padding:6px 12px;color:var(--sub);border-color:var(--border)}
.welcome-card{margin-bottom:20px;border-left:4px solid var(--accent)}
.welcome-card h2{font-size:1.1rem;font-weight:700;margin-bottom:6px}
.welcome-card p{font-size:.88rem;color:var(--sub);line-height:1.6}
.last-session-card{margin-bottom:20px;border-left:4px solid var(--yellow)}
.last-session-card h3{font-size:.8rem;font-weight:700;color:var(--yellow);margin-bottom:8px;text-transform:uppercase;letter-spacing:.06em}
.stat-row{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin-bottom:20px}
@media(max-width:520px){.stat-row{grid-template-columns:repeat(3,1fr)}}
.stat-box{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:16px 12px;text-align:center;box-shadow:0 1px 3px var(--shadow)}
.stat-box .num{font-size:2rem;font-weight:800;line-height:1.1;letter-spacing:-.03em}
.stat-box .lbl{font-size:.7rem;color:var(--sub);margin-top:4px;text-transform:uppercase;letter-spacing:.06em}
.section-label{font-size:.72rem;font-weight:700;color:var(--sub);text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px}
.ch-grid{display:flex;flex-wrap:wrap;gap:7px;max-height:260px;overflow-y:auto;padding:2px}
.ch-pill{padding:5px 12px;border:1.5px solid var(--border);border-radius:20px;background:var(--bg3);color:var(--text);cursor:pointer;font-size:.82rem;white-space:nowrap;transition:all .13s}
.ch-pill:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-dim)}
.ch-pill.on{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.ch-pill.mastered{border-color:var(--green);color:var(--green);background:var(--green-dim)}
.ch-pill.mastered.on{background:var(--green);color:#fff;border-color:var(--green)}
.weak-row{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--border)}
.weak-row:last-child{border:none}
.weak-row .wname{font-size:.84rem;flex:0 0 160px}
.weak-bar-bg{flex:1;height:7px;background:var(--bg3);border-radius:4px;overflow:hidden}
.weak-bar{height:100%;border-radius:4px;background:var(--red);transition:width .4s ease}
.weak-pct{font-size:.8rem;color:var(--sub);min-width:44px;text-align:right}
/* ── DAILY GOAL ── */
.daily-card{margin-bottom:20px;border-left:4px solid var(--green)}
.daily-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.daily-top .streak{font-size:1rem;font-weight:700}
.daily-top .goal-label{font-size:.8rem;color:var(--sub)}
.daily-bar-bg{height:8px;background:var(--bg3);border-radius:4px;overflow:hidden}
.daily-bar-fill{height:100%;border-radius:4px;background:var(--green);transition:width .4s ease}
/* ── ACTION BUTTONS GRID ── */
.action-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}
@media(max-width:440px){.action-grid{grid-template-columns:1fr}}
/* ── SESSION ── */
.sess-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:10px}
.sess-left{display:flex;flex-direction:column;gap:2px}
.sess-label{font-size:.85rem;color:var(--sub);font-weight:600}
.sess-chapter{font-size:.75rem;color:var(--accent);margin-top:2px}
.sess-right{display:flex;align-items:center;gap:10px}
.sess-dots{display:flex;gap:5px;align-items:center}
.sdot{width:9px;height:9px;border-radius:50%;background:var(--border);transition:background .2s,transform .15s}
.sdot.ok{background:var(--green)}.sdot.err{background:var(--red);transform:scale(1.2)}
.exam-timer{font-size:.95rem;font-weight:700;color:var(--accent);background:var(--accent-dim);padding:4px 10px;border-radius:20px;display:none;font-variant-numeric:tabular-nums}
.exam-timer.urgent{color:var(--red);background:var(--red-dim);animation:pulse .7s ease infinite}
.progress-rail{height:5px;background:var(--bg3);border-radius:3px;margin-bottom:20px;overflow:hidden}
.progress-fill{height:100%;background:var(--accent);border-radius:3px;transition:width .35s ease}
.q-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:24px;margin-bottom:14px;box-shadow:0 1px 4px var(--shadow);position:relative}
.q-meta{display:flex;align-items:center;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.q-id-tag{font-size:.72rem;font-weight:700;font-family:monospace;padding:2px 8px;border-radius:20px;background:var(--bg3);border:1px solid var(--border);color:var(--sub)}
.find-ticket-row{display:flex;align-items:center;gap:8px;margin-bottom:14px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:10px 14px}
.find-ticket-icon{font-size:1rem;flex-shrink:0}
.find-ticket-input{flex:1;min-width:0;background:transparent;border:none;outline:none;font-size:.95rem;color:var(--fg);font-family:inherit}
.find-ticket-input::placeholder{color:var(--sub)}
.find-ticket-input::-webkit-inner-spin-button,.find-ticket-input::-webkit-outer-spin-button{-webkit-appearance:none}
.find-ticket-btn{flex-shrink:0;padding:4px 14px;font-size:.85rem}
.q-chapter-tag{font-size:.72rem;color:var(--sub);font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.difficulty-tag{font-size:.72rem;font-weight:700;padding:2px 9px;border-radius:20px}
.q-stats-tag{font-size:.72rem;color:var(--sub);padding:2px 9px;border-radius:20px;background:var(--bg3);border:1px solid var(--border);margin-left:auto}
.diff-easy{background:var(--green-dim);color:var(--green)}
.diff-medium{background:var(--yellow-dim);color:var(--yellow)}
.diff-hard{background:var(--red-dim);color:var(--red)}
.diff-new{background:var(--accent-dim);color:var(--accent)}
.q-img{width:100%;max-height:240px;object-fit:contain;border-radius:8px;margin-bottom:14px;display:none;cursor:zoom-in;transition:opacity .15s}
.q-img:hover{opacity:.88}
.extra-img-btn{margin-top:12px;background:none;border:1.5px dashed var(--border);border-radius:var(--r);padding:7px 16px;font-size:.82rem;color:var(--sub);cursor:pointer;transition:border-color .15s,color .15s;width:100%;text-align:center}
.extra-img-btn:hover{border-color:var(--accent);color:var(--accent)}
.q-text{font-size:1.1rem;line-height:1.65;font-weight:500}
.bookmark-btn{position:absolute;top:14px;right:14px;background:none;border:none;cursor:pointer;font-size:1.3rem;opacity:.4;transition:opacity .15s,transform .15s;padding:2px}
.bookmark-btn:hover{opacity:1;transform:scale(1.15)}
.bookmark-btn.active{opacity:1}
.ans-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
@media(max-width:500px){.ans-grid{grid-template-columns:1fr}}
.ans-btn{padding:13px 15px;border:2px solid var(--border);border-radius:var(--r);background:var(--bg2);color:var(--text);cursor:pointer;font-size:.92rem;text-align:left;line-height:1.45;transition:border-color .12s,background .12s,opacity .15s,color .22s}
.ans-btn:hover:not(:disabled){border-color:var(--accent);background:var(--accent-dim)}
.ans-btn:disabled{cursor:default}
.ans-btn.correct{border-color:var(--green)!important;background:var(--green-dim)!important}
.ans-btn.wrong{border-color:var(--red)!important;background:var(--red-dim)!important}
.ans-btn.dimmed{opacity:.3}
.hint-box{background:var(--bg3);border:1px solid var(--border);border-left:4px solid var(--yellow);border-radius:var(--r);padding:14px 16px;margin-bottom:14px;font-size:.88rem;color:var(--sub);line-height:1.65;display:none}
.hint-box.show{display:block}
.sess-footer{display:flex;justify-content:space-between;align-items:center;gap:12px}
.retry-badge{font-size:.82rem;color:var(--red);background:var(--red-dim);padding:4px 10px;border-radius:20px;border:1px solid rgba(248,81,73,.3)}
.kbd-hint{font-size:.72rem;color:var(--sub);opacity:.6;margin-top:8px;text-align:center}
/* ── SUMMARY ── */
.summary-hero{text-align:center;padding:28px 24px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);margin-bottom:20px;box-shadow:0 1px 4px var(--shadow)}
.summary-emoji{font-size:3.5rem;margin-bottom:10px}
.summary-hero h1{font-size:1.8rem;font-weight:800;margin-bottom:5px;letter-spacing:-.02em}
.summary-hero p{color:var(--sub);font-size:.9rem}
.exam-verdict{font-size:1.1rem;font-weight:700;padding:10px 20px;border-radius:var(--r);margin-top:12px;display:inline-block}
.exam-pass{background:var(--green-dim);color:var(--green);border:1.5px solid var(--green)}
.exam-fail{background:var(--red-dim);color:var(--red);border:1.5px solid var(--red)}
.score-row{display:flex;justify-content:center;gap:32px;margin-top:20px;flex-wrap:wrap}
.sc .n{font-size:2.3rem;font-weight:800;letter-spacing:-.03em}
.sc .l{font-size:.72rem;color:var(--sub);text-transform:uppercase;letter-spacing:.04em;margin-top:2px}
.wrong-ticket{background:var(--bg2);border:1px solid var(--border);border-left:4px solid var(--red);border-radius:var(--r);padding:12px 16px;margin-bottom:8px;box-shadow:0 1px 2px var(--shadow)}
.wrong-ticket .wq{font-size:.9rem;margin-bottom:5px;font-weight:500}
.wrong-ticket .wm{font-size:.78rem;color:var(--sub);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.badge{display:inline-block;padding:2px 8px;border-radius:20px;font-size:.72rem;font-weight:700}
.badge-red{background:var(--red-dim);color:var(--red)}
.badge-green{background:var(--green-dim);color:var(--green)}
.badge-blue{background:var(--accent-dim);color:var(--accent)}
.badge-yellow{background:var(--yellow-dim);color:var(--yellow)}
.sum-actions{display:flex;gap:10px;margin-top:24px;flex-wrap:wrap}
.sum-actions .btn{flex:1;min-width:130px}
/* ── HISTORY ── */
.hist-grid{display:flex;align-items:flex-end;gap:5px;height:140px;padding:0 4px}
.hist-bar-wrap{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;min-width:0}
.hist-bar{width:100%;border-radius:4px 4px 0 0;transition:height .3s ease;min-height:3px;cursor:default}
.hist-bar-pass{background:var(--green)}
.hist-bar-ok{background:var(--yellow)}
.hist-bar-fail{background:var(--red)}
.hist-label{font-size:.6rem;color:var(--sub);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;text-align:center}
.hist-pct{font-size:.65rem;color:var(--sub);text-align:center}
/* ── CHEATSHEET ── */
.cheat-hero{text-align:center;margin-bottom:18px}
.cheat-hero .icon{font-size:2.5rem;margin-bottom:6px;display:block}
.cheat-hero h1{font-size:1.5rem;font-weight:800;letter-spacing:-.02em}
.cheat-hero p{color:var(--sub);font-size:.88rem;margin-top:4px;line-height:1.55}
.cheat-point{background:var(--bg2);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:var(--r);padding:14px 18px;margin-bottom:10px;box-shadow:0 1px 3px var(--shadow)}
.cheat-point h3{font-size:.98rem;font-weight:700;margin-bottom:6px;color:var(--accent)}
.cheat-point p{font-size:.9rem;line-height:1.6;color:var(--text)}
.cheat-point img{display:block;max-width:100%;max-height:200px;object-fit:contain;margin-top:10px;border-radius:8px;border:1px solid var(--border);background:var(--bg3);cursor:zoom-in;transition:opacity .15s}
.cheat-point img:hover{opacity:.88}
.cheat-code{display:inline-block;font-family:ui-monospace,SFMono-Regular,monospace;font-size:.72rem;color:var(--sub);background:var(--bg3);padding:1px 6px;border-radius:4px;margin-left:6px;vertical-align:middle}
.cheat-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.cheat-actions .btn{flex:1;min-width:140px}
/* ── IMAGE OVERLAY ── */
.img-overlay{position:fixed;inset:0;background:rgba(0,0,0,.88);z-index:500;display:flex;align-items:center;justify-content:center;cursor:zoom-out;animation:fadeIn .15s ease}
.img-overlay img{max-width:95vw;max-height:92vh;object-fit:contain;border-radius:8px;box-shadow:0 8px 40px rgba(0,0,0,.6)}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
/* ── TOAST ── */
#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--bg2);border:1px solid var(--border);border-radius:var(--r);padding:10px 20px;font-size:.88rem;z-index:999;pointer-events:none;transition:transform .25s,background .22s,border-color .22s;white-space:nowrap;box-shadow:0 4px 16px var(--shadow)}
#toast.show{transform:translateX(-50%) translateY(0)}
/* ── SYNC ── */
.sync-dot{width:7px;height:7px;border-radius:50%;background:var(--green);display:inline-block;margin-left:6px;vertical-align:middle;transition:background .3s}
.sync-dot.syncing{background:var(--yellow);animation:pulse .8s ease infinite}
.sync-dot.error{background:var(--red)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
</style>
</head>
<body>
<button id="theme-btn" aria-label="Toggle light/dark mode" title="Toggle theme">
<svg class="icon-moon" viewBox="0 0 24 24"><path d="M21 12.79A9 9 0 1 1 11.21 3a7 7 0 0 0 9.79 9.79z"/></svg>
<svg class="icon-sun" viewBox="0 0 24 24">
<circle cx="12" cy="12" r="5"/>
<line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/>
<line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/>
<line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/>
<line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/>
</svg>
</button>
<div id="toast"></div>
<!-- ── LOADING ── -->
<div id="screen-loading" class="screen active">
<div class="spinner"></div>
<div>Loading…</div>
</div>
<!-- ── LOGIN ── -->
<div id="screen-login" class="screen">
<div class="login-wrap">
<div class="login-box">
<div class="login-hero">
<span class="icon">🚗</span>
<h1>grU Trainer</h1>
<p>B / B1 Driving Exam · Smart Flashcards</p>
</div>
<div class="input-wrap">
<input id="login-input" type="text" placeholder="Your name" autocomplete="off" maxlength="40">
</div>
<button class="btn btn-primary btn-wide" id="btn-login">Continue →</button>
<div class="divider" id="users-divider" style="display:none">or pick your profile</div>
<div class="user-list" id="user-list"></div>
</div>
</div>
</div>
<!-- ── HOME ── -->
<div id="screen-home" class="screen">
<div class="wrap">
<div class="home-header">
<div class="home-title">
<h1 id="home-title-name">grU Trainer</h1>
<p id="home-title-sub">B / B1 · Smart Flashcards</p>
</div>
<div style="display:flex;align-items:center;gap:8px">
<span id="sync-indicator" class="sync-dot" title="Sync status"></span>
<button class="btn btn-ghost logout-btn" id="btn-logout">← Switch user</button>
</div>
</div>
<div class="card welcome-card" id="welcome-card" style="display:none">
<h2 id="welcome-title"></h2>
<p id="welcome-body"></p>
</div>
<!-- daily goal & streak -->
<div class="card daily-card" id="daily-card" style="display:none">
<div class="daily-top">
<div class="streak" id="streak-display"></div>
<div class="goal-label" id="goal-label"></div>
</div>
<div class="daily-bar-bg"><div class="daily-bar-fill" id="daily-bar-fill" style="width:0%"></div></div>
</div>
<div class="card last-session-card" id="last-session-card" style="display:none">
<h3>Last Session</h3>
<div id="last-session-body" style="font-size:.88rem;color:var(--sub);line-height:1.7"></div>
</div>
<div class="stat-row" id="stat-row"></div>
<!-- action buttons -->
<div class="action-grid" style="margin-bottom:10px">
<button class="btn btn-exam" id="btn-exam">📝 Exam Simulation</button>
<button class="btn btn-ghost" id="btn-history">📈 Session History</button>
</div>
<div class="action-grid" style="margin-bottom:10px">
<button class="btn btn-ghost" id="btn-cheatsheet-list">📖 Cheatsheets</button>
</div>
<div class="action-grid" style="margin-bottom:18px">
<button class="btn btn-due" id="btn-due" style="display:none">📅 Review Due</button>
<button class="btn btn-struggling" id="btn-struggling" style="display:none">⚡ Train Struggling</button>
<button class="btn btn-ghost" id="btn-bookmarked" style="display:none">🔖 Train Bookmarked</button>
</div>
<div class="find-ticket-row">
<span class="find-ticket-icon">🔍</span>
<input type="number" id="find-ticket-input" class="find-ticket-input" placeholder="Go to ticket #…" min="1" max="9999" autocomplete="off">
<button class="btn btn-ghost find-ticket-btn" id="btn-find-ticket">Go →</button>
</div>
<div class="card" style="margin-bottom:18px">
<div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:10px">
<div class="section-label" style="margin:0">Chapter Filter</div>
<div id="ch-selection-label" style="font-size:.82rem;color:var(--accent);font-weight:600"></div>
</div>
<div class="ch-grid" id="ch-grid"></div>
</div>
<button class="btn btn-ghost btn-wide" id="btn-cheatsheet" style="display:none;margin-bottom:8px">📖 გაკვეთილი — Cheatsheet</button>
<button class="btn btn-primary btn-wide" id="btn-start">▶ Start Session</button>
<div class="card" id="weak-card" style="margin-top:18px;display:none">
<div class="section-label" style="margin-bottom:14px">⚠ Chapters needing attention</div>
<div id="weak-list"></div>
</div>
<div style="margin-top:14px;text-align:center">
<button class="btn btn-danger" id="btn-reset" style="font-size:.8rem;padding:6px 14px">Reset my progress</button>
</div>
</div>
</div>
<!-- ── SESSION ── -->
<div id="screen-session" class="screen">
<div class="wrap">
<div class="sess-top">
<div class="sess-left">
<div class="sess-label" id="sess-label">0 left</div>
<div class="sess-chapter" id="sess-chapter-label"></div>
</div>
<div class="sess-right">
<div class="exam-timer" id="exam-timer">⏱ 20:00</div>
<div class="sess-dots" id="sess-dots"></div>
<button class="btn btn-ghost" id="btn-sess-home" style="padding:5px 10px;font-size:.8rem;color:var(--sub)" title="Back to home">🏠</button>
</div>
</div>
<div class="progress-rail"><div class="progress-fill" id="prog-fill" style="width:0%"></div></div>
<div class="q-card">
<button class="bookmark-btn" id="btn-bookmark" title="Bookmark this ticket">🔖</button>
<div class="q-meta">
<span class="q-id-tag" id="q-id"></span>
<span class="q-chapter-tag" id="q-chapter"></span>
<span class="difficulty-tag" id="q-difficulty"></span>
<span class="q-stats-tag" id="q-stats" style="display:none"></span>
</div>
<img id="q-img" class="q-img" alt="" onerror="this.style.display='none'">
<div class="q-text" id="q-text"></div>
<button id="btn-extra-img" class="extra-img-btn" style="display:none">📎 Additional photo</button>
</div>
<div class="ans-grid" id="ans-grid"></div>
<div class="hint-box" id="hint-box"></div>
<div class="sess-footer">
<div id="retry-badge-wrap"></div>
<button class="btn btn-primary" id="btn-next" style="display:none">Next →</button>
</div>
<div class="kbd-hint">1 – 4 to answer · Space / Enter for Next · B to bookmark</div>
</div>
</div>
<!-- ── SUMMARY ── -->
<div id="screen-summary" class="screen">
<div class="wrap">
<div class="summary-hero">
<div class="summary-emoji" id="sum-emoji"></div>
<h1 id="sum-title"></h1>
<p id="sum-sub"></p>
<div id="exam-verdict-wrap"></div>
<div class="score-row">
<div class="sc"><div class="n" style="color:var(--green)" id="sum-correct"></div><div class="l">First-try ✓</div></div>
<div class="sc"><div class="n" style="color:var(--red)" id="sum-wrong"></div> <div class="l">Needed retries</div></div>
<div class="sc"><div class="n" style="color:var(--accent)" id="sum-pct"></div> <div class="l">Score</div></div>
<div class="sc"><div class="n" style="color:var(--yellow)" id="sum-passes"></div> <div class="l">Passes</div></div>
</div>
</div>
<div id="problem-section" style="display:none">
<div class="section-label" style="margin:4px 0 12px">Tickets you struggled with</div>
<div id="problem-list"></div>
</div>
<div class="sum-actions">
<button class="btn btn-ghost" id="btn-home">🏠 Home</button>
<button class="btn btn-danger" id="btn-retry-wrongs" style="display:none">🔁 Retry Wrongs</button>
<button class="btn btn-success" id="btn-new">▶ New Session</button>
</div>
</div>
</div>
<!-- ── HISTORY ── -->
<div id="screen-history" class="screen">
<div class="wrap">
<div class="home-header" style="margin-bottom:20px">
<div class="home-title">
<h1>Session History</h1>
<p id="hist-subtitle">Last sessions</p>
</div>
<button class="btn btn-ghost logout-btn" id="btn-hist-back">← Back</button>
</div>
<div class="card" style="margin-bottom:18px">
<div class="section-label" style="margin-bottom:16px">Score % per session (newest → right)</div>
<div class="hist-grid" id="hist-grid"></div>
<div style="display:flex;gap:16px;margin-top:14px;font-size:.75rem;color:var(--sub)">
<span>🟢 ≥80% pass</span>
<span>🟡 60–79%</span>
<span>🔴 <60%</span>
</div>
</div>
<div class="card" id="hist-stats-card">
<div class="section-label" style="margin-bottom:12px">All-time stats</div>
<div id="hist-stats" style="font-size:.9rem;color:var(--sub);line-height:2"></div>
</div>
</div>
</div>
<!-- ── CHEATSHEET LIST ── -->
<div id="screen-cheatsheet-list" class="screen">
<div class="wrap">
<div class="home-header" style="margin-bottom:20px">
<div class="home-title">
<h1>📖 Cheatsheets</h1>
<p id="cheat-list-sub">აირჩიე თავი</p>
</div>
<button class="btn btn-ghost logout-btn" id="btn-cheat-list-back">← Back</button>
</div>
<div id="cheat-list-grid" style="display:flex;flex-direction:column;gap:8px"></div>
</div>
</div>
<!-- ── CHEATSHEET ── -->
<div id="screen-cheatsheet" class="screen">
<div class="wrap">
<div class="home-header" style="margin-bottom:20px">
<div class="home-title">
<h1 id="cheat-chapter-num" style="font-size:1.2rem;color:var(--sub)"></h1>
</div>
<button class="btn btn-ghost logout-btn" id="btn-cheat-back">← უკან</button>
</div>
<div class="cheat-hero">
<span class="icon">📖</span>
<h1 id="cheat-title"></h1>
<p id="cheat-intro"></p>
</div>
<div id="cheat-points"></div>
<div class="cheat-actions">
<button class="btn btn-ghost" id="btn-cheat-home">🏠 მთავარი</button>
<button class="btn btn-ghost" id="btn-cheat-skip">⏭ გამოტოვება</button>
<button class="btn btn-primary" id="btn-cheat-start">▶ ვარჯიშის დაწყება</button>
</div>
</div>
</div>
<script>
'use strict';
// ══════════════════════════════════════════════════════
// THEME
// ══════════════════════════════════════════════════════
(function initTheme() {
const saved = localStorage.getItem('gru-theme');
const preferred = window.matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark';
document.documentElement.dataset.theme = saved || preferred;
})();
document.getElementById('theme-btn').addEventListener('click', () => {
const next = document.documentElement.dataset.theme === 'dark' ? 'light' : 'dark';
document.documentElement.dataset.theme = next;
localStorage.setItem('gru-theme', next);
});
// ══════════════════════════════════════════════════════
// DATA
// ══════════════════════════════════════════════════════
let CHAPTERS = [];
let TICKETS = [];
let CHEATSHEETS = {};
const DAILY_GOAL = 20;
const EXAM_TOTAL = 30;
const EXAM_PASS = 24; // ≥24/30 = 80%
const EXAM_SECS = 20 * 60;
// ══════════════════════════════════════════════════════
// USER / SYNC
// ══════════════════════════════════════════════════════
let currentUser = null;
let prog = {};
let bookmarks = new Set();
let pendingSync = {};
let isOffline = false;
function setSyncStatus(state) {
const dot = document.getElementById('sync-indicator');
if (!dot) return;
dot.className = 'sync-dot' + (state === 'syncing' ? ' syncing' : state === 'error' ? ' error' : '');
dot.title = state === 'ok' ? 'Saved' : state === 'syncing' ? 'Saving…' : 'Save failed';
}
async function apiPost(path, body) {
const r = await fetch(path, {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify(body)});
if (!r.ok) throw new Error(`HTTP ${r.status}`);
return r.json();
}
async function apiPut(path, body) {
const r = await fetch(path, {method:'PUT', headers:{'Content-Type':'application/json'}, body:JSON.stringify(body)});
if (!r.ok) throw new Error(`HTTP ${r.status}`);
return r.json();
}
// ── OFFLINE HELPERS ──
function cacheProgressLocally() {
if (!currentUser) return;
try {
localStorage.setItem(`gru-offline-${currentUser.name}`,
JSON.stringify({ progress: prog, bookmarks: [...bookmarks] }));
} catch(e) {}
}
function loadCachedUser(name) {
try {
const raw = localStorage.getItem(`gru-offline-${name}`);
return raw ? JSON.parse(raw) : null;
} catch(e) { return null; }
}
function getCachedUserNames() {
const names = [];
for (let i = 0; i < localStorage.length; i++) {
const k = localStorage.key(i);
if (k?.startsWith('gru-offline-')) names.push(k.slice('gru-offline-'.length));
}
return names;
}
async function flushProgress() {
if (!currentUser || !Object.keys(pendingSync).length) return;
setSyncStatus('syncing');
try {
await apiPut('api/progress', {name: currentUser.name, updates: pendingSync});
pendingSync = {};
isOffline = false;
setSyncStatus('ok');
} catch(e) {
isOffline = true;
setSyncStatus('error');
}
cacheProgressLocally();
}
async function saveSessionToServer(summary) {
await flushProgress();
cacheProgressLocally(); // always persist locally, even if server sync failed
try { await apiPost('api/session', {name: currentUser.name, summary}); } catch(e) {}
}
// ══════════════════════════════════════════════════════
// SM-2
// ══════════════════════════════════════════════════════
function tp(id) {
const key = String(id);
if (!prog[key]) prog[key] = {attempts:0,correct:0,streak:0,lastSeen:0,interval:0,ef:2.5};
return prog[key];
}
function sm2Update(id, quality, chapterId) {
const p = tp(id);
const key = String(id);
p.attempts++;
p.lastSeen = Date.now();
if (chapterId != null) p.chapter_id = chapterId;
if (quality >= 3) {
p.correct++;
p.streak++;
if (p.streak === 1) p.interval = 1;
else if (p.streak === 2) p.interval = 6;
else p.interval = Math.round(p.interval * p.ef);
p.ef = Math.max(1.3, p.ef + 0.1 - (5-quality)*(0.08+(5-quality)*0.02));
} else {
p.streak = 0;
p.interval = 1;
p.ef = Math.max(1.3, p.ef - 0.2);
}
// Sticky struggling flag: set when accuracy is bad, only cleared by mastery
if (p.streak >= 3) {
p.struggling = false;
} else if (p.attempts >= 2 && (1 - p.correct / p.attempts) >= 0.4) {
p.struggling = true;
}
pendingSync[key] = {...p};
}
// ══════════════════════════════════════════════════════
// TICKET FILTERS
// ══════════════════════════════════════════════════════
function cardDifficulty(id) {
const p = prog[String(id)];
if (!p || p.attempts === 0) return {label:'New', cls:'diff-new'};
const err = 1 - p.correct / p.attempts;
if (err > 0.5) return {label:'Hard', cls:'diff-hard'};
if (err > 0.25) return {label:'Medium', cls:'diff-medium'};
return {label:'Easy', cls:'diff-easy'};
}
let chapFilter = new Set();
function selectTickets() {
const now = Date.now(), DAY = 86_400_000;
let pool = chapFilter.size > 0 ? TICKETS.filter(t => chapFilter.has(t.chapter_id)) : TICKETS;
if (!pool.length) pool = TICKETS;
return pool.slice().sort((a,b) => ticketPriority(b,now,DAY) - ticketPriority(a,now,DAY));
}
function ticketPriority(t, now, DAY) {
const p = prog[String(t.id)];
if (!p || p.attempts === 0) return 500 + Math.random()*50;
const err = 1 - p.correct / p.attempts;
const ageDays = (now - p.lastSeen) / DAY;
const overdue = ageDays - p.interval;
if (err > 0.5 && ageDays < 14) return 900 + err*100;
if (overdue > 0) return 700 + overdue*20 + err*50;
if (err > 0.3) return 400 + err*100;
return Math.max(0, 100 - p.streak*15 + Math.random()*20);
}
function strugglingTickets() {
return TICKETS.filter(t => {
const p = prog[String(t.id)];
if (!p || p.streak >= 3) return false;
// Use persistent flag if set; fall back to accuracy check for older data
if (p.struggling === true) return true;
if (p.struggling === false) return false;
return p.attempts >= 2 && (1 - p.correct / p.attempts) >= 0.4;
}).sort(() => Math.random() - 0.5);
}
function dueTickets() {
const now = Date.now(), DAY = 86_400_000;
return TICKETS.filter(t => {
const p = prog[String(t.id)];
return p && p.attempts > 0 && p.lastSeen + p.interval * DAY <= now;
}).sort((a,b) => {
const pa = prog[String(a.id)], pb = prog[String(b.id)];
return (pb.lastSeen - pb.interval*DAY) - (pa.lastSeen - pa.interval*DAY);
});
}
function bookmarkedTickets() {
return TICKETS.filter(t => bookmarks.has(t.id));
}
function examTickets() {
const shuffled = TICKETS.slice().sort(() => Math.random() - 0.5);
return shuffled.slice(0, EXAM_TOTAL);
}
// ══════════════════════════════════════════════════════
// SESSION STATE
// ══════════════════════════════════════════════════════
let S = null;
let examInterval = null;
let lastStruggled = [];
function makeSession(tickets, isExam) {
const states = new Map();
tickets.forEach(t => states.set(t.id, {firstTryOk:null, wrongCount:0}));
return {
deck: tickets, queue: [...tickets], states,
history: [], passNum: 1, cardsProcessed: 0,
deckSize: tickets.length, examMode: !!isExam,
examSecsLeft: EXAM_SECS,
};
}
function startExamTimer() {
const el = document.getElementById('exam-timer');
el.style.display = 'block';
clearInterval(examInterval);
examInterval = setInterval(() => {
S.examSecsLeft--;
const m = Math.floor(S.examSecsLeft / 60);
const s = S.examSecsLeft % 60;
el.textContent = `⏱ ${String(m).padStart(2,'0')}:${String(s).padStart(2,'0')}`;
el.classList.toggle('urgent', S.examSecsLeft <= 60);
if (S.examSecsLeft <= 0) {
clearInterval(examInterval);
endSession();
}
}, 1000);
}
function stopExamTimer() {
clearInterval(examInterval);
examInterval = null;
document.getElementById('exam-timer').style.display = 'none';
}
// ══════════════════════════════════════════════════════
// HELPERS
// ══════════════════════════════════════════════════════
function shuffle(arr) {
for (let i = arr.length-1; i > 0; i--) {
const j = Math.floor(Math.random()*(i+1));
[arr[i],arr[j]] = [arr[j],arr[i]];
}
return arr;
}
function chTitle(id) {
const ch = CHAPTERS.find(c => c.chapter_id === id);
return ch ? ch.chapter_title : `Ch.${id}`;
}
function relativeTime(isoStr) {
if (!isoStr) return '';
const diff = Date.now() - new Date(isoStr).getTime();
const m = Math.floor(diff/60000);
if (m < 2) return 'just now';
if (m < 60) return `${m} min ago`;
const h = Math.floor(m/60);
if (h < 24) return `${h}h ago`;
const d = Math.floor(h/24);
return d === 1 ? 'yesterday' : `${d} days ago`;
}
let toastTimer;
function toast(msg, ms=2500) {
const el = document.getElementById('toast');
el.textContent = msg;
el.classList.add('show');
clearTimeout(toastTimer);
toastTimer = setTimeout(() => el.classList.remove('show'), ms);
}
function showScreen(id) {
document.querySelectorAll('.screen').forEach(s => { s.classList.remove('active'); s.style.display='none'; });
const el = document.getElementById(id);
el.style.display = id === 'screen-loading' ? 'flex' : 'block';
el.classList.add('active');
}
function escHtml(s) {
return s.replace(/&/g,'&').replace(/</g,'<').replace(/>/g,'>').replace(/"/g,'"');
}
// ══════════════════════════════════════════════════════
// LOGIN
// ══════════════════════════════════════════════════════
async function renderLogin() {
showScreen('screen-login');
const list = document.getElementById('user-list');
const div = document.getElementById('users-divider');
try {
const users = await (await fetch('api/users')).json();
if (users.length > 0) {
div.style.display = 'block';
div.textContent = 'or pick your profile';
list.innerHTML = users.map(u => `
<div class="user-card" onclick="loginAs('${escHtml(u.name)}')">
<div class="user-avatar">👤</div>
<div class="user-info">
<div class="user-name">${escHtml(u.name)}</div>
<div class="user-meta">
${u.mastered} mastered · ${u.due} due
${u.streak ? `· 🔥 ${u.streak}d streak` : ''}
${u.last_session ? '· ' + relativeTime(u.last_session.date) : ''}
</div>
</div>
${u.struggling > 0 ? `<span class="user-badge">⚡ ${u.struggling} hard</span>` : ''}
</div>
`).join('');
}
} catch(e) {
// Offline — show locally cached profiles
const names = getCachedUserNames();
if (names.length) {
div.style.display = 'block';
div.textContent = '📴 Offline — cached profiles';
list.innerHTML = names.map(n => `
<div class="user-card" onclick="loginAs('${escHtml(n)}')">
<div class="user-avatar">👤</div>
<div class="user-info">
<div class="user-name">${escHtml(n)}</div>
<div class="user-meta">Offline mode · local progress</div>
</div>
</div>
`).join('');
}
}
}
async function loginAs(name) {
if (!name.trim()) return;
showScreen('screen-loading');
try {
const data = await apiPost('api/login', {name: name.trim()});
currentUser = data;
prog = data.progress || {};
bookmarks = new Set(data.bookmarks || []);
pendingSync = {};
isOffline = false;
cacheProgressLocally();
renderHome();
} catch(e) {
// Try offline fallback
const cached = loadCachedUser(name.trim());
if (cached) {
currentUser = { name: name.trim(), is_new: false, stats: {}, recent_sessions: [] };
prog = cached.progress || {};
bookmarks = new Set(cached.bookmarks || []);
pendingSync = {};
isOffline = true;
toast('📴 Offline — using cached progress', 3500);
renderHome();
} else {
toast('No connection and no cached data for this name.');
showScreen('screen-login');
}
}
}
document.getElementById('btn-login').onclick = () => {
const name = document.getElementById('login-input').value.trim();
if (!name) { toast('Please enter your name.'); return; }
loginAs(name);
};
document.getElementById('login-input').addEventListener('keydown', e => {
if (e.key === 'Enter') document.getElementById('btn-login').click();
});
// ══════════════════════════════════════════════════════
// HOME
// ══════════════════════════════════════════════════════
function renderHome() {
const stats = currentUser.stats || {};
document.getElementById('home-title-name').textContent = currentUser.name;
document.getElementById('home-title-sub').textContent = 'B / B1 · Smart Flashcards';
// welcome card
const wCard = document.getElementById('welcome-card');
wCard.style.display = 'block';
if (currentUser.is_new) {
document.getElementById('welcome-title').textContent = `Welcome, ${currentUser.name}! 👋`;
document.getElementById('welcome-body').textContent = "You have 921 tickets to master. Let's start — pick a chapter or go through everything!";
} else {
const due = stats.due || 0, str = stats.struggling || 0;
document.getElementById('welcome-title').textContent = `Welcome back, ${currentUser.name}! 👋`;
const parts = [];
if (due > 0) parts.push(`📅 ${due} due for review`);
if (str > 0) parts.push(`⚡ ${str} struggling`);
if (!parts.length) parts.push("You're all caught up! Keep practicing.");
document.getElementById('welcome-body').textContent = parts.join(' · ');
}
// daily goal & streak
const streak = stats.streak || 0;
const today = stats.today_answered || 0;
const pct = Math.min(100, Math.round(today / DAILY_GOAL * 100));
const dailyCard = document.getElementById('daily-card');
dailyCard.style.display = 'block';
document.getElementById('streak-display').textContent =
streak > 0 ? `🔥 ${streak} day${streak > 1 ? ' streak' : ''}` : '🌱 Start your streak!';
document.getElementById('goal-label').textContent =
`${today} / ${DAILY_GOAL} today (${pct}%)`;
document.getElementById('daily-bar-fill').style.width = pct + '%';
// last session
const ls = stats.last_session;
const lsCard = document.getElementById('last-session-card');
if (ls) {
lsCard.style.display = 'block';
const p = ls.total ? Math.round(ls.firstTryOk / ls.total * 100) : 0;
const chaps = ls.chapters ? ls.chapters.join(', ') : 'All chapters';
document.getElementById('last-session-body').innerHTML =
`${relativeTime(ls.date)} · <strong>${ls.firstTryOk}/${ls.total}</strong> first-try (${p}%) · ` +
`${ls.passes} pass${ls.passes===1?'':'es'} · Chapters: ${chaps}` +
(ls.struggled_count > 0
? `<br>⚠️ Struggled with <strong>${ls.struggled_count}</strong> ticket${ls.struggled_count===1?'':'s'}`
: ' · ✅ Zero struggles!');
} else { lsCard.style.display = 'none'; }
renderStats(stats);
renderChapters();
renderWeak(stats);
renderActionBtns();
showScreen('screen-home');
}
function renderStats(stats) {
const seen = stats?.seen ?? 0;
const mastered = stats?.mastered ?? 0;
const due = stats?.due ?? 0;
const learning = stats?.learning ?? 0;
const newT = TICKETS.length - seen;
document.getElementById('stat-row').innerHTML = `
<div class="stat-box"><div class="num" style="color:var(--sub)">${newT}</div><div class="lbl">New</div></div>
<div class="stat-box"><div class="num" style="color:var(--accent)">${learning}</div><div class="lbl">Learning</div></div>
<div class="stat-box"><div class="num" style="color:var(--yellow)">${due}</div><div class="lbl">Due</div></div>
<div class="stat-box"><div class="num" style="color:var(--red)">${stats?.struggling??0}</div><div class="lbl">Struggling</div></div>
<div class="stat-box"><div class="num" style="color:var(--green)">${mastered}</div><div class="lbl">Mastered</div></div>
`;
}
function renderActionBtns() {
const str = strugglingTickets();
const due = dueTickets();
const bkm = bookmarkedTickets();
const btnS = document.getElementById('btn-struggling');
const btnD = document.getElementById('btn-due');
const btnB = document.getElementById('btn-bookmarked');
btnS.style.display = str.length ? 'inline-flex' : 'none';
if (str.length) btnS.textContent = `⚡ Struggling (${str.length})`;
btnD.style.display = due.length ? 'inline-flex' : 'none';
if (due.length) btnD.textContent = `📅 Due Review (${due.length})`;
btnB.style.display = bkm.length ? 'inline-flex' : 'none';
if (bkm.length) btnB.textContent = `🔖 Bookmarked (${bkm.length})`;
}
function renderChapters() {
const grid = document.getElementById('ch-grid');
grid.innerHTML = '';
grid.appendChild(mkPill(`All (${TICKETS.length})`, chapFilter.size===0, true,
() => { chapFilter.clear(); renderChapters(); }));
CHAPTERS.forEach(ch => {
const chT = TICKETS.filter(t => t.chapter_id === ch.chapter_id);
if (!chT.length) return;
const seen = chT.filter(t => prog[String(t.id)]?.attempts > 0);
const allMastered = seen.length === chT.length &&
chT.every(t => (prog[String(t.id)]?.streak||0) >= 3);
let label = `${ch.chapter_id}. ${ch.chapter_title} (${chT.length})`;
if (allMastered) {
label += ' ✅';
} else if (seen.length > 0) {
const err = seen.reduce((s,t) => s+(1-(prog[String(t.id)]?.correct||0)/(prog[String(t.id)]?.attempts||1)),0)/seen.length;
label += err>0.4?' 🔴':err>0.2?' 🟡':' 🟢';
}
const pill = mkPill(label, chapFilter.has(ch.chapter_id), false, () => {
if (chapFilter.has(ch.chapter_id)) chapFilter.delete(ch.chapter_id);
else chapFilter.add(ch.chapter_id);
renderChapters();
});
if (allMastered) pill.classList.add('mastered');
grid.appendChild(pill);
});
const sel = document.getElementById('ch-selection-label');
if (chapFilter.size===0) {
sel.textContent = 'All chapters';
} else {
const total = TICKETS.filter(t => chapFilter.has(t.chapter_id)).length;
sel.textContent = `${chapFilter.size} chapter${chapFilter.size>1?'s':''} · ${total} tickets`;
}
const btn = document.getElementById('btn-start');
const cheatBtn = document.getElementById('btn-cheatsheet');
if (chapFilter.size===0) {
btn.textContent = `▶ Start Smart Session — All (${TICKETS.length} tickets)`;
cheatBtn.style.display = 'none';
} else if (chapFilter.size===1) {
const id = [...chapFilter][0];