:root {
  --color-bg-app: #F5F6FA;
  --color-bg-sidebar: #F0F2F7;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F7F8FC;
  --color-bg-hover: #F1F3FA;
  --color-bg-selected: #E8EAF6;
  --color-border: #CFD8DC;
  --color-border-strong: #B0BEC5;
  --color-text: #242424;
  --color-text-inverse: #FFFFFF;
  --color-primary: #5C6BC0;
  --color-primary-hover: #4F5FAE;
  --color-primary-active: #46539A;
  --color-primary-soft: #EEF0FA;
  --color-secondary: #ECEFF1;
  --chart-progress: #5C6BC0;
  --chart-secondary: #7B86C8;
  --chart-muted: #B0BEC5;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 20px;
  --font-size-xl: 28px;
  --radius-ui: 4px;
  --radius-pill: 999px;
  --shadow-focus: 0 0 0 3px rgba(92, 107, 192, .18);
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  background: var(--color-bg-app);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}
button, select { font: inherit; }
button { color: inherit; }
.skip-link { position: fixed; top: -80px; left: 12px; z-index: 100; background: var(--color-primary); color: white; padding: 8px 12px; }
.skip-link:focus { top: 12px; }
.shell { display: grid; grid-template-columns: 248px minmax(0, 1fr); min-height: 100vh; }
.sidebar { position: sticky; top: 0; height: 100vh; padding: 28px 20px 20px; background: var(--color-bg-sidebar); border-right: 1px solid var(--color-border); display: flex; flex-direction: column; }
.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 28px; font-size: var(--font-size-lg); font-weight: 700; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 28px; height: 28px; background: var(--color-primary); color: white; border-radius: var(--radius-ui); font-weight: 800; }
.nav { display: grid; gap: 6px; }
.nav-item { display: flex; gap: 10px; align-items: center; width: 100%; min-height: 40px; padding: 0 12px; border: 1px solid transparent; border-radius: var(--radius-ui); background: transparent; font-weight: 600; text-align: left; cursor: pointer; }
.nav-item span:last-child { white-space: nowrap; }
.nav-item:hover, .nav-item:focus-visible { background: var(--color-surface); border-color: var(--color-primary); outline: none; box-shadow: var(--shadow-focus); }
.nav-item.is-selected { background: var(--color-primary); color: var(--color-text-inverse); }
.sidebar-note { margin-top: auto; display: flex; gap: 10px; align-items: flex-start; padding-top: 16px; border-top: 1px solid var(--color-border); }
.sidebar-note strong, .sidebar-note small { display: block; }
.sidebar-note strong { font-size: var(--font-size-xs); }
.sidebar-note small { margin-top: 2px; font-size: 11px; opacity: .65; }
.status-dot { width: 8px; height: 8px; margin-top: 6px; flex: 0 0 auto; border-radius: var(--radius-pill); background: var(--color-primary); }
main { min-width: 0; padding: 36px 40px 64px; }
#app { max-width: 1180px; margin: 0 auto; }
.page-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 32px; }
.eyebrow { margin: 0 0 4px; font-size: var(--font-size-xs); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; opacity: .62; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 6px; font-size: var(--font-size-xl); line-height: 1.25; letter-spacing: -.02em; }
h2 { margin-bottom: 12px; font-size: var(--font-size-lg); line-height: 1.35; }
h3 { margin-bottom: 6px; font-size: var(--font-size-md); }
.muted { opacity: .64; }
.page-head p { margin-bottom: 0; }
.section { margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--color-border); }
.hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-ui); }
.hero-main { padding: 32px; }
.hero-side { display: grid; align-content: center; gap: 20px; padding: 32px; background: var(--color-surface-subtle); border-left: 1px solid var(--color-border); }
.score-label { margin-bottom: 4px; font-size: var(--font-size-xs); font-weight: 700; opacity: .62; }
.score { display: flex; align-items: baseline; gap: 6px; margin: 0 0 12px; font-size: 64px; line-height: 1; font-weight: 700; letter-spacing: -.05em; }
.score small { font-size: var(--font-size-md); letter-spacing: 0; opacity: .52; }
.delta { display: inline-flex; align-items: center; min-height: 28px; padding: 0 10px; border: 1px solid var(--color-border); border-radius: var(--radius-pill); background: var(--color-primary-soft); color: var(--color-primary-active); font-size: var(--font-size-xs); font-weight: 700; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button { min-height: 40px; padding: 0 16px; border: 1px solid transparent; border-radius: var(--radius-ui); font-size: 13px; font-weight: 700; cursor: pointer; transition: background .14s ease, border-color .14s ease; }
.button:hover, .button:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.button-primary { background: var(--color-primary); color: var(--color-text-inverse); }
.button-primary:hover { background: var(--color-primary-hover); }
.button-secondary { background: var(--color-secondary); border-color: var(--color-border-strong); }
.button-secondary:hover { background: var(--color-surface); border-color: var(--color-primary); }
.button-ghost { background: transparent; }
.button-ghost:hover { background: var(--color-bg-hover); }
.button:disabled { cursor: not-allowed; opacity: .38; box-shadow: none; }
.mode-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--color-border); background: var(--color-surface); }
.mode { min-height: 118px; padding: 20px; border: 0; border-right: 1px solid var(--color-border); background: var(--color-surface); text-align: left; cursor: pointer; }
.mode:last-child { border-right: 0; }
.mode:hover, .mode:focus-visible { position: relative; outline: 2px solid var(--color-primary); outline-offset: -2px; }
.mode strong, .mode span { display: block; }
.mode span { margin-top: 6px; font-size: var(--font-size-xs); opacity: .64; }
.history-list { border: 1px solid var(--color-border); background: var(--color-surface); }
.history-row { display: grid; grid-template-columns: 1fr 120px 100px 40px; align-items: center; gap: 16px; min-height: 58px; padding: 8px 16px; border-bottom: 1px solid var(--color-border); }
.history-row:last-child { border-bottom: 0; }
.history-row button { width: 36px; height: 36px; border: 0; background: transparent; color: var(--color-primary); cursor: pointer; }
.history-row button:hover { background: var(--color-bg-hover); }
.empty { padding: 28px; border: 1px solid var(--color-border); background: var(--color-surface); text-align: center; }
.test-shell { max-width: 840px; margin: 0 auto; }
.test-top { display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; margin-bottom: 28px; }
.progress-meta { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: var(--font-size-xs); font-weight: 700; }
.progress-track { height: 6px; background: var(--color-secondary); overflow: hidden; border-radius: var(--radius-pill); }
.progress-fill { height: 100%; background: var(--color-primary); transition: width .25s ease; }
.timer { min-width: 94px; padding-left: 16px; border-left: 1px solid var(--color-border); text-align: right; font-variant-numeric: tabular-nums; }
.timer small { display: block; font-size: 11px; opacity: .58; }
.question-panel { padding: 28px 0; border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.question-kind { display: inline-flex; min-height: 26px; align-items: center; padding: 0 9px; margin-bottom: 14px; border: 1px solid var(--color-border); border-radius: var(--radius-pill); color: var(--color-primary-active); font-size: var(--font-size-xs); font-weight: 700; }
.question-text { font-size: var(--font-size-md); font-weight: 600; }
.code-block { margin: 20px 0; padding: 18px 20px; overflow: auto; border: 1px solid var(--color-border); border-radius: var(--radius-ui); background: #242424; color: #F5F6FA; font: 13px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; tab-size: 2; }
.choices { display: grid; gap: 8px; margin: 20px 0 0; padding: 0; border: 0; min-width: 0; }
.choice { display: grid; grid-template-columns: 28px 1fr; align-items: center; min-height: 50px; padding: 8px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-ui); background: var(--color-surface); cursor: pointer; }
.choice:hover { border-color: var(--color-primary); }
.choice:has(input:focus-visible) { border-color: var(--color-primary); box-shadow: var(--shadow-focus); }
.choice:has(input:checked) { background: var(--color-primary); border-color: var(--color-primary); color: white; }
.choice input { width: 16px; height: 16px; margin: 0; accent-color: var(--color-primary); }
.question-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 20px; }
.feedback { margin-top: 18px; padding: 16px; border-left: 3px solid var(--color-primary); background: var(--color-primary-soft); }
.feedback strong { display: block; margin-bottom: 4px; }
.result-hero { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 24px; padding-bottom: 28px; border-bottom: 1px solid var(--color-border); }
.result-score { font-size: 72px; line-height: .95; font-weight: 700; letter-spacing: -.06em; }
.result-score span { font-size: var(--font-size-lg); letter-spacing: 0; opacity: .5; }
.result-meta { text-align: right; }
.chart-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; }
.bar-chart { display: grid; gap: 12px; }
.bar-row { display: grid; grid-template-columns: minmax(110px, 1fr) 2fr 48px; gap: 10px; align-items: center; font-size: var(--font-size-xs); }
.bar-track { height: 8px; background: var(--color-secondary); overflow: hidden; border-radius: var(--radius-pill); }
.bar-fill { height: 100%; background: var(--chart-progress); }
.bar-value { text-align: right; font-variant-numeric: tabular-nums; font-weight: 700; }
.trend-controls { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
select { min-height: 36px; padding: 0 34px 0 10px; border: 1px solid var(--color-border-strong); border-radius: var(--radius-ui); background: var(--color-surface); }
select:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--shadow-focus); }
.trend-chart { width: 100%; height: 190px; border: 1px solid var(--color-border); background: var(--color-surface); }
.trend-line { fill: none; stroke: var(--chart-progress); stroke-width: 3; }
.trend-grid { stroke: var(--color-border); stroke-width: 1; }
.trend-dot { fill: var(--color-surface); stroke: var(--chart-progress); stroke-width: 3; }
.analysis { max-width: 760px; padding-left: 18px; border-left: 3px solid var(--color-primary); }
.analysis p { margin-bottom: 12px; }
.analysis p:last-child { margin-bottom: 0; }
details { border-top: 1px solid var(--color-border); }
summary { padding: 16px 0; font-weight: 700; cursor: pointer; }
.data-table { width: 100%; border-collapse: collapse; background: var(--color-surface); border: 1px solid var(--color-border); }
.data-table th, .data-table td { padding: 10px 12px; border-bottom: 1px solid var(--color-border); text-align: left; font-size: var(--font-size-xs); }
.data-table th { background: var(--color-surface-subtle); }
.data-table td:last-child, .data-table th:last-child { text-align: right; }
.loading { display: grid; place-items: center; min-height: 50vh; }
.spinner { width: 28px; height: 28px; border: 3px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: spin .7s linear infinite; }
.toast { position: fixed; right: 20px; bottom: 20px; z-index: 20; max-width: 360px; padding: 12px 16px; background: #242424; color: white; border-radius: var(--radius-ui); opacity: 0; transform: translateY(8px); pointer-events: none; transition: .2s ease; }
.toast.is-visible { opacity: 1; transform: none; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation-duration: .01ms !important; } }
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; width: 100%; height: auto; padding: 14px 18px; flex-direction: row; align-items: center; gap: 18px; border-right: 0; border-bottom: 1px solid var(--color-border); }
  .brand { margin: 0; }
  .nav { display: flex; margin-left: auto; }
  .nav-item { width: auto; flex: 0 0 auto; }
  .sidebar-note { display: none; }
  main { padding: 28px 20px 48px; }
  .hero, .chart-grid { grid-template-columns: 1fr; }
  .hero-side { border-left: 0; border-top: 1px solid var(--color-border); }
}
@media (max-width: 560px) {
  .brand span:last-child, .nav-item span:first-child { display: none; }
  .sidebar { gap: 10px; }
  .nav-item { padding: 0 9px; font-size: var(--font-size-xs); }
  .page-head, .result-hero { align-items: flex-start; flex-direction: column; display: flex; }
  .mode-list { grid-template-columns: 1fr; }
  .mode { border-right: 0; border-bottom: 1px solid var(--color-border); }
  .mode:last-child { border-bottom: 0; }
  .history-row { grid-template-columns: 1fr 70px 36px; }
  .history-row .history-date { display: none; }
  .score { font-size: 54px; }
  .result-score { font-size: 60px; }
  .result-meta { text-align: left; }
  .bar-row { grid-template-columns: 110px 1fr 42px; }
}