/* Paid app additions on top of ../styles.css */
.app-top { position: sticky; top: 0; z-index: 4; background: var(--bg); }
.app-nav { display: flex; gap: 4px; }
.app-nav button { background: none; border: 0; font: 600 15px/1 inherit; color: var(--muted); padding: 12px 10px; border-radius: 10px; cursor: pointer; min-height: 44px; }
.app-nav button.is-on { color: var(--primary); background: var(--primary-weak); }
body[data-view="loading"] .app-nav, body[data-view="signin"] .app-nav, body[data-view="paywall"] .app-nav,
body[data-view="player"] .app-nav { display: none; }
body[data-view="player"] .footer { display: none; }
.app-top + .view .quiz-head { top: 72px; }

.h-md { font-size: clamp(24px, 5vw, 32px); font-weight: 800; margin: 0 0 .4em; }
.center-card { text-align: center; padding: 48px 16px; }
.stack { display: grid; gap: 10px; }
.stack-row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.or { display: flex; align-items: center; gap: 10px; color: var(--muted); margin: 14px 0; font-size: 14px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.error { color: var(--bad); font-weight: 600; }
.tiny-link { min-height: 0; padding: 0; font-size: 13px; font-weight: 600; }
.mt { margin-top: 20px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }

.dash-hello { padding: 16px 0 0; }
.dash-hello .muted { margin: 0; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat { margin: 12px 0 0; padding: 16px; }
.stat-label { margin: 0; font-size: 13px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.stat-value { margin: 4px 0 2px; font-size: 30px; font-weight: 800; }
.action-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.action { text-align: left; border: 1.5px solid var(--border); background: var(--surface); color: var(--text); border-radius: 14px; padding: 14px; font: inherit; cursor: pointer; display: grid; gap: 2px; min-height: 72px; }
.action:hover { border-color: var(--primary); }
.action span { color: var(--muted); font-size: 14px; }
.form-list { display: grid; gap: 10px; }
.form-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
.form-row p { margin: 0; }

.field-set { border: 0; padding: 0; margin: 0 0 18px; }
.field-set legend { font-weight: 700; margin-bottom: 8px; }
.topic-sec { margin-bottom: 10px; }
.topic-sec > label { display: flex; align-items: center; gap: 8px; font-weight: 700; min-height: 40px; }
.topic-subs { display: flex; flex-wrap: wrap; gap: 8px; padding-left: 4px; }
.chip-check { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; font-size: 14px; cursor: pointer; min-height: 40px; background: var(--surface); }
.chip-check input { accent-color: var(--primary); }
.chip-check .n { color: var(--muted); font-size: 12px; }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 6px; background: var(--surface-2); padding: 4px; border-radius: 12px; }
.seg button { border: 0; background: transparent; color: var(--text); font: 650 15px/1.2 inherit; padding: 10px 8px; border-radius: 9px; cursor: pointer; min-height: 44px; }
.seg button small { display: block; font-weight: 500; font-size: 12px; color: var(--muted); }
.seg button.is-on { background: var(--surface); box-shadow: var(--shadow); color: var(--primary); }

.quiz-right { display: inline-flex; align-items: center; gap: 10px; }
.timer { font-weight: 800; font-variant-numeric: tabular-nums; padding: 2px 10px; border-radius: 999px; background: var(--surface-2); }
.timer.low { background: var(--bad-weak); color: var(--bad); }

@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .stats .stat:first-child { grid-column: 1 / -1; }
  .app-nav button { padding: 10px 8px; font-size: 14px; }
  .form-row { flex-direction: column; align-items: stretch; }
}

.start-card { border: 2px solid var(--primary); }
.stack-row.left { justify-content: flex-start; }
.action:disabled { opacity: .55; cursor: default; }
.action:disabled:hover { border-color: var(--border); }
.flash { margin: 12px 0 0; padding: 12px 14px; border-radius: 12px; background: var(--primary-weak); color: var(--text); font-weight: 650; }
@media (max-width: 520px) { .r-actions { flex-direction: column; align-items: stretch; } }