:root{
  --bg:#f7f7fb;
  --card:#ffffff;
  --accent:#2b6cb0;
  --muted:#6b7280;
}
*{box-sizing:border-box}
html,body{height:100%}
.app-wrap{width:100%;max-width:420px}
.app-wrap{width:100%;max-width:420px}
body{
  margin:0; font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg); color:#111; display:flex; flex-direction:column; align-items:center; justify-content:flex-start; min-height:100vh; padding:16px;
}
.screen{width:100%;background:var(--card);border-radius:16px;box-shadow:0 6px 22px rgba(16,24,40,0.08);position:relative;overflow:auto;-webkit-overflow-scrolling:touch}
.screen.hidden{display:none}
.hidden{display:none}
.app-title{margin:20px;text-align:center;font-size:20px}
.panel{padding:12px 18px;border-top:1px solid #f0f0f3}
.ops{display:flex;gap:8px;flex-wrap:wrap}
.op-btn{flex:1 1 48%;padding:12px;border-radius:10px;border:1px solid #e6e9ef;background:white;font-size:16px}
.op-btn.active{background:var(--accent);color:white;border-color:var(--accent)}
.op-btn.disabled{opacity:0.45}
.modes{display:flex;gap:12px;padding-top:8px}
.mode-btn{flex:1;padding:12px;border-radius:10px;border:1px solid #e6e9ef;background:white;font-size:16px}
.mode-btn.active{background:#111;color:white}
.hint{padding:12px 18px;color:var(--muted);font-size:14px}

.settings{display:flex;flex-direction:column;gap:8px}
.settings label{display:flex;justify-content:space-between;align-items:center;gap:12px}
.settings input{width:120px;padding:8px;border-radius:8px;border:1px solid #e6e9ef}
.settings-actions{display:flex;gap:8px;margin-top:6px}
.settings.collapsed{display:none}
.collapsed{display:none}
.small{font-size:13px;padding:6px 8px;border-radius:8px;border:1px solid #e6e9ef;background:white}

.progress-outer{height:12px;background:#eef3fb;border-radius:8px;overflow:hidden;margin:8px 14px}
.progress-inner{height:100%;background:var(--accent);width:0%}


.play-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-bottom:1px solid #f0f0f3}
.play-header .small{background:transparent;border:0;color:var(--accent);font-weight:600}
.problem-area{padding:18px;text-align:center}
.problem{font-size:44px;font-weight:700;margin:6px 0}
.problem.big{font-size:64px}
.timer{font-size:18px;color:var(--muted);margin-bottom:8px}
.answer-area{padding:8px 14px 20px}
.answer{min-height:56px;font-size:30px;text-align:center;padding:8px;border-radius:8px;background:#f6f7fb;margin-bottom:10px}
.feedback{height:22px;color:var(--muted)}
.keypad{display:grid;gap:10px}
.row{display:flex;gap:8px}
.key{flex:1;padding:16px;border-radius:12px;border:1px solid #e6e9ef;background:white;font-size:22px}
.key.large{padding:18px;font-size:24px}
.key.special{background:#fff7ed}
.submit-btn{flex:1;padding:16px;border-radius:12px;background:var(--accent);color:white;font-weight:700;font-size:18px;border:0}
.score{font-weight:700}

.history-list{display:flex;flex-direction:column;gap:8px}
.history-item{padding:10px;border-radius:8px;background:#f6f7fb;border:1px solid #e9eef6}
.history-meta{font-size:12px;color:var(--muted)}

.summary{padding:18px;text-align:center}
.summary h2{margin:6px 0}
.summary p{font-size:18px}

.app-footer{font-size:12px;color:var(--muted);text-align:center;padding:10px 0;width:100%;max-width:420px}

/* ── Shared learn-page styles ── */
.learn-title{margin:20px 16px 0;font-size:22px;font-weight:700;text-align:center}
.learn-subtitle{text-align:center;color:var(--muted);font-size:14px;margin:4px 16px 12px}
.table-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;padding:0 4px}
.table-btn{padding:14px 6px;border-radius:10px;border:1px solid #e6e9ef;background:white;font-size:18px;font-weight:600;cursor:pointer}
.table-btn.active{background:var(--accent);color:white;border-color:var(--accent)}
.table-btn.all{grid-column:span 5;font-size:15px}
.start-btn{display:block;width:calc(100% - 32px);margin:14px 16px;padding:16px;border-radius:12px;background:var(--accent);color:white;font-size:18px;font-weight:700;border:0;cursor:pointer}
.learn-problem{font-size:60px;font-weight:700;text-align:center;margin:12px 0 4px}
.learn-score-bar{display:flex;justify-content:space-between;align-items:center;padding:10px 18px;font-size:15px;color:var(--muted)}
.learn-score-bar strong{font-size:18px;color:#111}
.learn-feedback{height:24px;text-align:center;font-size:16px;color:var(--muted)}

@media (orientation:portrait){
  .screen{max-height:94vh}
}

/* ── Back-to-hub button ── */
.nav-wrap{position:relative;width:100%;max-width:420px;display:flex;justify-content:flex-start;padding:6px 8px 0}
.back-to-hub{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:var(--card);border:1px solid #e6e9ef;border-radius:10px;font-size:15px;font-weight:600;color:var(--accent);text-decoration:none;box-shadow:0 2px 8px rgba(16,24,40,0.07);cursor:pointer}
.back-to-hub:hover{background:#f0f4ff}

/* ── Hub page ── */
.hub-screen{padding-bottom:20px}
.hub-logo{font-size:26px;padding:20px 0 4px}
.hub-group{padding:14px 18px}
.hub-group-title{font-size:15px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 12px}
.hub-cards{display:flex;flex-direction:column;gap:10px}
.hub-card{display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:12px;border:1px solid #e6e9ef;background:white;text-decoration:none;color:#111;font-size:17px;font-weight:500;transition:background .15s,box-shadow .15s}
.hub-card:hover{background:#f0f4ff;box-shadow:0 4px 14px rgba(43,108,176,0.12);color:var(--accent)}
.hub-card-icon{font-size:22px;width:32px;text-align:center;flex-shrink:0}
.hub-card-label{flex:1}
.hub-card-badge{font-size:11px;font-weight:600;padding:3px 8px;border-radius:20px;background:#f3f4f6;color:var(--muted)}
.hub-card--disabled{opacity:.55;cursor:default;pointer-events:none}

/* Mobile-specific: ensure the app fills viewport and screens scroll vertically */
@media (max-width:480px){
  body{padding:0}
  .app-wrap{max-width:100%;height:100vh}
  .screen{height:100vh;max-height:none;border-radius:0;overflow:auto;-webkit-overflow-scrolling:touch}
}

/* ── Czytanie — list screen ── */
.reading-list{display:flex;flex-direction:column;gap:8px}
.reading-item{width:100%;padding:14px 16px;border-radius:10px;border:1px solid #e6e9ef;background:white;text-align:left;font-size:16px;font-family:inherit;cursor:pointer}
.reading-item:hover,.reading-item:active{background:#f0f4ff;color:var(--accent)}
.custom-input{width:100%;min-height:100px;padding:10px 12px;border-radius:10px;border:1px solid #e6e9ef;font-size:15px;font-family:inherit;resize:vertical;margin-bottom:10px;display:block}

/* ── Czytanie — reading screen ── */
.read-wrap{position:fixed;inset:0;background:white;display:flex;flex-direction:column;z-index:50}
.read-wrap.hidden{display:none}

.read-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;padding-top:max(10px,env(safe-area-inset-top));background:white;border-bottom:1px solid #e6e9ef;flex-shrink:0}
.read-nav-btn{padding:8px 14px;border-radius:10px;border:1px solid #e6e9ef;background:white;font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;flex-shrink:0}
.read-nav-btn:hover{background:#f0f4ff;color:var(--accent)}
.read-speed-btn{min-width:52px;text-align:center;letter-spacing:.05em}
.read-title-text{flex:1;text-align:center;font-size:15px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#111}

.read-viewport{flex:1;overflow:hidden;padding:20px 20px 0;position:relative}
.read-text{font-size:clamp(52px,16vw,82px);font-weight:700;line-height:1.35;word-break:break-word;overflow-wrap:break-word;hyphens:auto;color:#111;transition:transform .32s cubic-bezier(.4,0,.2,1);will-change:transform}

.next-line-btn{position:absolute;bottom:max(24px,calc(env(safe-area-inset-bottom) + 12px));right:20px;width:64px;height:64px;border-radius:50%;background:var(--accent);color:white;font-size:26px;border:none;box-shadow:0 4px 20px rgba(43,108,176,.38);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:opacity .2s}
.next-line-btn:disabled{opacity:.3;cursor:default}

/* ── Dyktando ── */
.blank-progress{font-size:14px;font-weight:600;color:var(--muted);white-space:nowrap;flex-shrink:0}

.dyk-body{flex:1;display:flex;flex-direction:column;overflow:hidden}
.dyk-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}
.dyk-text{padding:20px;font-size:40px;line-height:1.8}

/* inline blank spans */
.dyk-blank{display:inline;font-weight:700}
.dyk-blank--pending{color:#dc2626;border-bottom:2px solid #dc2626}
.dyk-blank--active{color:#dc2626;background:#fee2e2;border-radius:4px;padding:0 2px;animation:dyk-pulse 1s ease-in-out infinite}
.dyk-blank--ok{color:#16a34a;font-weight:700}
.dyk-blank--err{font-weight:700}
.dyk-blank--err s{color:#dc2626;text-decoration:line-through}
.dyk-blank--err sup{color:#16a34a;font-size:.6em;font-weight:700;margin-left:1px}
@keyframes dyk-pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* choice buttons */
.dyk-choices{flex-shrink:0;display:flex;gap:12px;padding:12px 16px;padding-bottom:max(12px,env(safe-area-inset-bottom));background:white;border-top:2px solid #e6e9ef}
.dyk-choices.hidden{display:none}
.choice-btn{flex:1;padding:18px 8px;border-radius:14px;border:2px solid var(--accent);background:white;font-size:24px;font-weight:700;cursor:pointer;color:var(--accent);font-family:inherit;transition:background .12s,color .12s}
.choice-btn:hover,.choice-btn:active{background:var(--accent);color:white}

/* summary */
.dyk-summary{padding:20px}
.dyk-summary-text{font-size:40px;line-height:1.8;margin-bottom:20px}
.summary-score{font-size:18px;font-weight:700;text-align:center;color:#111;margin:0 0 20px}
.dyk-summary-back{display:block;width:100%;margin-bottom:32px}
.dyk-word--ok{color:#16a34a;font-weight:700}
.dyk-word--err{color:#dc2626;font-weight:700}