:root {
  --bg: #fff;
  --bg-header: #fff;
  --bg-section: #f5f5f5;
  --bg-card: #fff;
  --text: #111;
  --text-muted: #999;
  --border: #e0e0e0;
  --accent: #0055e5;
  --accent-subtle: #e8efff;
  --track: #ebebeb;
  --danger: #c82200;
  --skip-bg: #f0f0f0;
  --skip-border: #bbb;
  --skip-dot: #aaa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --bg-header: #0c0c0c;
    --bg-section: #161616;
    --bg-card: #1a1a1a;
    --text: #f0f0f0;
    --text-muted: #666;
    --border: #282828;
    --accent: #4d8bff;
    --accent-subtle: #0c1e3a;
    --track: #202020;
    --danger: #ff5c38;
    --skip-bg: #111;
    --skip-border: #333;
    --skip-dot: #444;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, ui-sans-serif, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

body {
  max-width: 640px;
  margin: 0 auto;
  padding-bottom: 72px;
}

/* ── Sticky header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  padding: 13px 16px 11px;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 9px;
}

.app-brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.app-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.app-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0;
}

.counter {
  font-size: 13px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.progress-track {
  height: 3px;
  background: var(--track);
  border-radius: 2px;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width 0.22s ease;
}

/* ── Sections ── */
.sections {
  padding: 14px 12px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

details.section {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-section);
  overflow: hidden;
}

details.section > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 14px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  min-height: 44px;
}

details.section > summary::-webkit-details-marker { display: none; }

.summary-inner {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 600;
}

.chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.15s;
}

details[open] > summary .chevron {
  transform: rotate(90deg);
}

.badge {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1px 8px;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.badge.done {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-subtle);
}

/* ── Card grid ── */
.items {
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 10px;
}

@media (min-width: 420px) {
  .items { grid-template-columns: repeat(4, 1fr); }
}

/* ── Individual card ── */
.item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 16px 6px 13px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  cursor: pointer;
  min-height: 96px;
  text-align: center;
  user-select: none;
  transition: background 0.13s, border-color 0.13s, opacity 0.13s;
  outline: none;
}

.item:focus-visible {
  box-shadow: 0 0 0 3px var(--accent);
}

.item-emoji {
  font-size: 2rem;
  line-height: 1;
  transition: opacity 0.13s, filter 0.13s;
  pointer-events: none;
}

.item-label {
  font-size: 11px;
  font-weight: 500;
  line-height: 1.3;
  color: var(--text);
  transition: color 0.13s, text-decoration 0.13s;
  pointer-events: none;
}

.item-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
  color: #fff;
  opacity: 0;
  transition: opacity 0.13s, background 0.13s;
  pointer-events: none;
  line-height: 1;
}

/* ── Checked state ── */
.item[data-state="checked"] {
  background: var(--accent-subtle);
  border-color: var(--accent);
}

.item[data-state="checked"] .item-emoji { opacity: 0.45; }
.item[data-state="checked"] .item-label { color: var(--text-muted); }
.item[data-state="checked"] .item-dot   { opacity: 1; background: var(--accent); }

/* ── Skipped state ── */
.item[data-state="skipped"] {
  background: var(--skip-bg);
  border-color: var(--skip-border);
  border-style: dashed;
}

.item[data-state="skipped"] .item-emoji {
  opacity: 0.2;
  filter: grayscale(1);
}

.item[data-state="skipped"] .item-label {
  color: var(--text-muted);
  text-decoration: line-through;
  text-decoration-color: var(--skip-border);
}

.item[data-state="skipped"] .item-dot { opacity: 1; background: var(--skip-dot); }

/* ── Footer ── */
.footer {
  display: flex;
  justify-content: center;
  padding: 28px 16px 0;
}

.reset-btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--danger);
  background: transparent;
  border: 1px solid var(--danger);
  border-radius: 8px;
  padding: 0 20px;
  height: 44px;
  cursor: pointer;
  opacity: 0.75;
  transition: opacity 0.1s;
}

.reset-btn:hover  { opacity: 1; }
.reset-btn:active { opacity: 0.5; }

/* ── Language toggle ── */
.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 3px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2px 8px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.4;
  font-family: inherit;
  transition: border-color 0.13s;
}

.lang-btn:hover { border-color: var(--accent); }

.lang-sep {
  font-size: 9px;
  color: var(--text-muted);
}

.lang-flag {
  opacity: 0.3;
  transition: opacity 0.13s;
}

.lang-flag.active { opacity: 1; }

/* ── Completion counter state ── */
.counter.ready {
  color: var(--accent);
  font-weight: 500;
}


/* ── Help button ── */
.help-btn {
  position: fixed;
  bottom: 24px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  transition: border-color 0.13s, color 0.13s;
}

.help-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Tutorial overlay ── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.overlay.hidden {
  display: none;
}

.tutorial {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px 20px;
  max-width: 300px;
  width: 100%;
}

.tutorial-title {
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
}

.tutorial-rows {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.tutorial-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Mini demo cards */
.demo-card {
  flex-shrink: 0;
  position: relative;
  width: 62px;
  height: 62px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.demo-card.demo-checked {
  background: var(--accent-subtle);
  border-color: var(--accent);
}

.demo-card.demo-skipped {
  background: var(--skip-bg);
  border-color: var(--skip-border);
  border-style: dashed;
}

.demo-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.demo-dot-check { background: var(--accent); }
.demo-dot-skip  { background: var(--skip-dot); }

.demo-emoji {
  font-size: 1.4rem;
  line-height: 1;
}

.demo-card.demo-checked .demo-emoji { opacity: 0.45; }
.demo-card.demo-skipped .demo-emoji { opacity: 0.2; filter: grayscale(1); }

.demo-lbl {
  font-size: 9px;
  font-weight: 500;
  color: var(--text);
}

.demo-card.demo-checked .demo-lbl { color: var(--text-muted); }
.demo-card.demo-skipped .demo-lbl {
  color: var(--text-muted);
  text-decoration: line-through;
  text-decoration-color: var(--skip-border);
}

.tutorial-row-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.row-action {
  font-size: 11px;
  color: var(--text-muted);
}

.row-result {
  font-size: 14px;
  font-weight: 600;
}

.tutorial-btn {
  display: block;
  width: 100%;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  height: 44px;
  cursor: pointer;
  transition: opacity 0.1s;
}

.tutorial-btn:hover  { opacity: 0.88; }
.tutorial-btn:active { opacity: 0.7; }