/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
[hidden] { display: none !important; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic UI", "Yu Gothic", Meiryo, "Noto Sans JP", system-ui, sans-serif;
  background: #f6f8fb;
  color: #1f2937;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-soft: #dbeafe;
  --color-secondary: #64748b;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-muted: #6b7280;
  --color-warn: #b45309;
  --color-warn-bg: #fef3c7;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.08);
}

/* ===== Layout ===== */
#app {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.screen {
  display: none;
  flex: 1;
  min-height: 100vh;
  min-height: 100dvh;
  flex-direction: column;
}
.screen.is-active { display: flex; }

.screen-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.screen-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  flex: 1;
  text-align: center;
}
.spacer { width: 44px; }
.screen-footer {
  padding: 16px 18px calc(16px + env(safe-area-inset-bottom));
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  position: sticky;
  bottom: 0;
}

/* ===== Start screen ===== */
.start-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
  text-align: center;
  gap: 24px;
}
.app-title {
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.3;
  margin: 0;
  color: #0f172a;
  letter-spacing: 0.02em;
}
.app-subtitle {
  font-size: 16px;
  margin: 0;
  color: var(--color-muted);
}

/* ===== Buttons ===== */
.btn {
  appearance: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-weight: 600;
  padding: 12px 20px;
  font-size: 16px;
  transition: background 0.15s ease, transform 0.05s ease, box-shadow 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid #93c5fd; outline-offset: 2px; }

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:disabled {
  background: #cbd5e1;
  color: #f1f5f9;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.btn-secondary:hover { background: #bfdbfe; }

.btn-ghost {
  background: transparent;
  color: var(--color-secondary);
}
.btn-ghost:hover { background: #f1f5f9; }

.btn-large {
  width: 100%;
  padding: 18px 24px;
  font-size: 20px;
  border-radius: var(--radius-lg);
  min-height: 60px;
}

.btn-mini {
  padding: 6px 12px;
  font-size: 13px;
  background: #f1f5f9;
  color: #334155;
  border-radius: 999px;
}
.btn-mini:hover { background: #e2e8f0; }

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  font-size: 22px;
  border-radius: 12px;
}

.btn-icon-inline { font-size: 18px; }

/* ===== Setup screen ===== */
.setup-body {
  flex: 1;
  overflow-y: auto;
  padding: 18px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.setup-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 18px 18px 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.setup-section-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
  color: #0f172a;
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.hint { font-size: 12px; color: var(--color-muted); font-weight: 400; }

.cat-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

.checkbox-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chip-check {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: #f8fafc;
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
  font-size: 14px;
  transition: all 0.15s ease;
  flex: 1 1 auto;
  justify-content: center;
  min-height: 44px;
}
.chip-check small { font-size: 11px; color: var(--color-muted); margin-left: 4px; }
.chip-check input { position: absolute; opacity: 0; pointer-events: none; }
.chip-check:has(input:checked) {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 600;
}
.chip-check:has(input:checked) small { color: var(--color-primary); }

.cat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: #f8fafc;
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  cursor: pointer;
  user-select: none;
  font-size: 15px;
  transition: all 0.15s ease;
  min-height: 50px;
}
.cat-item input { width: 18px; height: 18px; accent-color: var(--color-primary); }
.cat-item .cat-label { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cat-item .cat-count { font-size: 12px; color: var(--color-muted); white-space: nowrap; }
.cat-item:has(input:checked) {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
}
.cat-item:has(input:checked) .cat-count { color: var(--color-primary); }
.cat-item .core-badge {
  font-size: 10px;
  background: #fde68a;
  color: #92400e;
  padding: 2px 6px;
  border-radius: 999px;
  font-weight: 700;
}

/* ===== Slider ===== */
.slider-row {
  display: flex;
  align-items: center;
  gap: 14px;
}
#count-slider {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: #e2e8f0;
  border-radius: 999px;
  outline: none;
}
#count-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 4px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
#count-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 4px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.slider-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  min-width: 40px;
  text-align: right;
}
.slider-unit { font-size: 14px; color: var(--color-muted); }

/* ===== Toggle ===== */
.toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  min-height: 44px;
}
.toggle input { position: absolute; opacity: 0; pointer-events: none; }
.toggle-track {
  width: 50px;
  height: 28px;
  background: #cbd5e1;
  border-radius: 999px;
  position: relative;
  transition: background 0.2s ease;
  flex-shrink: 0;
}
.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform 0.2s ease;
}
.toggle input:checked + .toggle-track { background: var(--color-primary); }
.toggle input:checked + .toggle-track .toggle-thumb { transform: translateX(22px); }
.toggle-label { font-size: 15px; }

/* ===== Setup summary ===== */
.setup-summary {
  background: #f1f5f9;
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.summary-line {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}
.summary-key { font-size: 14px; color: var(--color-muted); }
.summary-value { font-size: 22px; font-weight: 700; color: var(--color-primary); }
.summary-unit { font-size: 14px; color: var(--color-muted); }

.warning {
  background: var(--color-warn-bg);
  color: var(--color-warn);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
}

/* ===== Quiz screen ===== */
.progress {
  flex: 1;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  color: #0f172a;
}
.progress-sep { color: var(--color-muted); margin: 0 6px; }

.quiz-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.card-frame {
  background: white;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 460px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  padding: 16px;
}
.card-frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.answer-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 460px;
}
.answer-label {
  font-size: clamp(36px, 8vw, 52px);
  font-weight: 700;
  color: #0f172a;
  text-align: center;
  letter-spacing: 0.05em;
  background: white;
  border-radius: var(--radius-lg);
  padding: 18px 32px;
  box-shadow: var(--shadow-sm);
  min-width: 60%;
  border: 2px solid var(--color-primary-soft);
}
.answer-label.is-hint {
  color: var(--color-secondary);
  border-color: #fde68a;
  background: #fffbeb;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
  padding: 14px 20px;
}
.hint-char {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1em;
  padding: 2px 6px;
  border-radius: 8px;
  transition: background 0.15s ease, color 0.2s ease, transform 0.15s ease;
}
.hint-char.masked {
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.hint-char.masked:hover { background: rgba(180, 83, 9, 0.08); }
.hint-char.masked:active { background: rgba(180, 83, 9, 0.16); }
.hint-char.revealed { color: var(--color-warn); animation: hint-pop 0.3s ease; }
@keyframes hint-pop {
  0%   { transform: scale(1.25); }
  100% { transform: scale(1); }
}

.quiz-footer {
  display: flex;
  gap: 12px;
}
.quiz-footer .btn { flex: 1; }

/* ===== End screen ===== */
.end-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
  text-align: center;
  gap: 16px;
}
.end-emoji { font-size: 64px; }
.end-title {
  font-size: clamp(28px, 6vw, 40px);
  margin: 0;
  color: #0f172a;
}
.end-sub {
  font-size: 16px;
  color: var(--color-muted);
  margin: 0 0 16px;
}
.end-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 320px;
}

/* ===== Tablet & desktop ===== */
@media (min-width: 720px) {
  .setup-body { max-width: 720px; margin: 0 auto; width: 100%; align-self: center; }
  .screen-footer { padding-bottom: 20px; }
  .screen-footer > .btn-large {
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
  }
  .end-buttons .btn-large { max-width: 360px; margin-left: auto; margin-right: auto; display: flex; }
  .start-inner > .btn-large { max-width: 360px; margin-left: auto; margin-right: auto; }
  .quiz-footer {
    width: 100%;
    max-width: 460px;
    align-self: center;
    padding-left: 0;
    padding-right: 0;
  }
  .quiz-footer .btn { max-width: none; }
}

@media (min-width: 1024px) {
  .card-frame { max-width: 520px; }
  .answer-label { font-size: 56px; }
}