/* ============================================================
   JFT-Basic Practice — Modern Japanese Editorial
   ============================================================
   Aesthetic: sumi-ink dark + ai-iro (藍色, indigo) accent
              cool-tuned palette for long-session focus
   Display:   Shippori Mincho B1 — refined modern mincho
   Body:      Noto Sans JP — legible kana/kanji
   Numerals:  JetBrains Mono — tabular figures for timer/score
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Shippori+Mincho+B1:wght@400;500;700;800&family=Noto+Sans+JP:wght@300;400;500;700&family=JetBrains+Mono:wght@400;500;700&display=swap");

/* ---------- design tokens ---------- */
:root {
  /* sumi-ink palette, shifted cool (less warm undertone) */
  --ink-0: #0c1218;
  --ink-1: #131a23;
  --ink-2: #1a2230;
  --ink-3: #232c3c;
  --ink-4: #2e394d;
  --rule:  #2a3343;

  /* washi (text-on-dark) — cooler off-white */
  --paper-0: #eef2f5;
  --paper-1: #c8d0d9;
  --paper-2: #8590a0;
  --paper-3: #5b6677;

  /* one accent — ai-iro 藍色 (traditional Japanese indigo, calm and focused) */
  --shu:        #4a9bc8;   /* legacy name kept; value is now ai-iro */
  --shu-dim:    #2d7396;
  --shu-glow:   rgba(74, 155, 200, 0.20);

  /* secondary spectrum — section colors, mixed temperature for variety */
  --sec-1: #b9b264;   /* moegi muted yellow-green — Script & Vocabulary */
  --sec-2: #6ba4c4;   /* hanada blue — Conversation & Expression */
  --sec-3: #7fb1b5;   /* asagi pale teal — Listening (was warm pink) */
  --sec-4: #8aab6f;   /* matcha — Reading */

  /* semantic */
  --ok:    #8aab6f;
  --warn:  #d4a847;   /* warning kept warm — functional signal only */
  --bad:   #c25554;   /* fail muted clay — calmer than fiery red */

  /* spacing scale (8-pt grid) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  /* radii — kept tight, almost zero, with one playful exception */
  --r-0: 0;
  --r-1: 2px;
  --r-2: 6px;
  --r-pill: 999px;

  /* shadows */
  --sh-1: 0 1px 0 rgba(0,0,0,0.5), 0 4px 24px rgba(0,0,0,0.35);
  --sh-2: 0 1px 0 rgba(0,0,0,0.5), 0 12px 40px rgba(0,0,0,0.55);

  /* motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-fast: 120ms;
  --t-med:  280ms;
  --t-slow: 600ms;

  /* containers */
  --maxw: 1080px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--shu); color: var(--ink-0); }

/* ---------- base typography ---------- */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  font-family: "Noto Sans JP", system-ui, -apple-system, sans-serif;
  font-weight: 400;
  font-feature-settings: "palt" 1;     /* proportional kerning for kana */
  color: var(--paper-0);
  background: var(--ink-0);
  background-image:
    radial-gradient(1200px 600px at 80% -200px, rgba(74, 155, 200, 0.10), transparent 60%),
    radial-gradient(900px 700px at -200px 100%, rgba(138, 171, 111, 0.05), transparent 60%);
  background-attachment: fixed;
  letter-spacing: 0.005em;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
}

/* paper-grain noise layer — sets atmosphere without being noisy */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.045;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

h1, h2, h3, h4 {
  font-family: "Shippori Mincho B1", "Noto Serif JP", serif;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0;
}

h1 { font-size: clamp(1.6rem, 2.2vw + 1rem, 2.6rem); }
h2 { font-size: clamp(1.25rem, 0.8vw + 1rem, 1.7rem); font-weight: 500; }
h3 { font-size: 1.15rem; font-weight: 500; }

p { margin: 0 0 var(--s-3); }

.kana, .ja {
  font-family: "Shippori Mincho B1", "Noto Serif JP", serif;
}

.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }

.kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--paper-2);
}

.muted { color: var(--paper-2); }
.center { text-align: center; }

/* ============================================================
   LAYOUT — header + main
   ============================================================ */

main {
  flex: 1;
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-6) var(--s-5) var(--s-9);
}

.site-header {
  position: relative;
  z-index: 2;
  padding: var(--s-5) var(--s-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-5);
  flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
  background: rgba(12, 18, 24, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .brand {
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
}

.site-header .brand .mark {
  font-family: "Shippori Mincho B1", serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--shu);
  line-height: 1;
  letter-spacing: -0.02em;
}

.site-header .brand .title {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-header .brand .kana-sub {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--paper-2);
  text-transform: uppercase;
}

/* hero kanji — decorative anchor floating top-right of pages */
.hero-kanji {
  position: fixed;
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: clamp(20rem, 50vw, 42rem);
  line-height: 0.85;
  color: var(--ink-2);
  user-select: none;
  pointer-events: none;
  top: 50%;
  right: -8%;
  transform: translateY(-50%);
  z-index: 0;
  letter-spacing: -0.04em;
}

/* ============================================================
   LANDING PAGE
   ============================================================ */

.intro {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: var(--s-7) 0;
  margin-bottom: var(--s-7);
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--s-6);
  align-items: end;
}
@media (max-width: 720px) {
  .intro { grid-template-columns: 1fr; }
}

.intro .lead-kana {
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: clamp(3rem, 6vw, 5rem);
  line-height: 0.9;
  color: var(--paper-0);
}
.intro .lead-kana em {
  display: block;
  color: var(--shu);
  font-style: normal;
  font-size: 0.45em;
  font-weight: 500;
  margin-top: var(--s-3);
  letter-spacing: 0.08em;
}

.intro .lead-copy p {
  font-size: 1.05rem;
  color: var(--paper-1);
  max-width: 52ch;
}
.intro .lead-copy ul {
  list-style: none;
  padding: 0;
  margin: var(--s-4) 0 0;
  display: grid;
  gap: var(--s-2);
  font-size: 0.95rem;
  color: var(--paper-2);
}
.intro .lead-copy ul li::before {
  content: "—";
  color: var(--shu);
  margin-right: var(--s-2);
}

.step-label {
  display: flex;
  align-items: baseline;
  gap: var(--s-3);
  margin: var(--s-7) 0 var(--s-4);
}
.step-label .num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--shu);
}
.step-label .text {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.4rem;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--s-3);
}
.mode-card {
  position: relative;
  text-align: left;
  padding: var(--s-5);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  transition: transform var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
  overflow: hidden;
}
.mode-card::before {
  content: attr(data-kanji);
  position: absolute;
  right: -10px;
  top: -28px;
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: 6.5rem;
  color: var(--ink-3);
  line-height: 1;
  user-select: none;
  transition: color var(--t-med) var(--ease), transform var(--t-med) var(--ease);
  pointer-events: none;
}
.mode-card:hover {
  border-color: var(--paper-3);
  transform: translateY(-2px);
}
.mode-card:hover::before { color: var(--shu-dim); transform: translate(-4px, 4px); }
.mode-card.selected {
  border-color: var(--shu);
  background: linear-gradient(180deg, rgba(224,74,44,0.12), transparent 60%), var(--ink-1);
}
.mode-card.selected::before { color: var(--shu); }
.mode-card .num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--paper-3);
}
.mode-card .label {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.6rem;
  font-weight: 500;
  margin-top: var(--s-2);
  z-index: 1;
}
.mode-card .desc {
  font-size: 0.88rem;
  color: var(--paper-2);
  z-index: 1;
  position: relative;
}

.paper-picker {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--s-2);
}
.paper-card {
  position: relative;
  padding: var(--s-4) var(--s-4) var(--s-4) var(--s-5);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.paper-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--paper-3);
  transition: background var(--t-fast) var(--ease);
}
.paper-card:hover { border-color: var(--paper-3); }
.paper-card:hover::before { background: var(--shu-dim); }
.paper-card.selected {
  border-color: var(--shu);
  background: var(--ink-2);
}
.paper-card.selected::before { background: var(--shu); }
.paper-card .num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--paper-3);
}
.paper-card .name {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper-0);
}
.paper-card .meta {
  font-size: 0.8rem;
  color: var(--paper-2);
}

.action-bar {
  display: flex;
  gap: var(--s-3);
  margin-top: var(--s-7);
  justify-content: flex-end;
  flex-wrap: wrap;
  align-items: center;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  --bg: var(--shu);
  --fg: var(--paper-0);
  --bd: var(--shu);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-3) var(--s-5);
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--bd);
  border-radius: var(--r-1);
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease);
  position: relative;
}
.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 0 0 4px var(--shu-glow);
}
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.btn.secondary {
  --bg: transparent;
  --fg: var(--paper-0);
  --bd: var(--rule);
}
.btn.secondary:hover:not(:disabled) {
  --bd: var(--paper-1);
  background: var(--ink-2);
  box-shadow: none;
}
.btn.danger { --bg: var(--shu); --bd: var(--shu); }
.btn.ghost {
  --bg: transparent;
  --fg: var(--paper-2);
  --bd: transparent;
  padding: var(--s-2) var(--s-3);
}
.btn.ghost:hover:not(:disabled) { --fg: var(--paper-0); background: var(--ink-2); box-shadow: none; }

.btn .kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 6px;
  margin-left: var(--s-2);
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 3px;
  letter-spacing: 0.05em;
}

/* keyboard hint chip (standalone) */
.kbd-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  font-weight: 600;
  min-width: 22px;
  padding: 2px 6px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 3px;
  color: var(--paper-1);
  letter-spacing: 0.05em;
}

/* focus rings */
:focus-visible {
  outline: 2px solid var(--shu);
  outline-offset: 3px;
}

/* ============================================================
   EXAM TOOLBAR + TIMER
   ============================================================ */

.exam-toolbar {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--s-3) var(--s-5);
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: var(--s-4);
  align-items: center;
  background: rgba(14,14,16,0.92);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.exam-toolbar .title {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper-1);
}
.exam-toolbar .exit-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-3);
  font-size: 0.85rem;
  color: var(--paper-2);
  border-radius: var(--r-1);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.exam-toolbar .exit-link:hover { color: var(--paper-0); background: var(--ink-2); }

.timer {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--paper-0);
  padding: var(--s-2) var(--s-4);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  position: relative;
  transition: color var(--t-med) var(--ease), border-color var(--t-med) var(--ease), background var(--t-med) var(--ease);
}
.timer::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--r-1);
  pointer-events: none;
  opacity: 0;
  box-shadow: 0 0 0 4px var(--shu-glow);
  transition: opacity var(--t-med) var(--ease);
}
.timer.warning {
  color: var(--warn);
  border-color: var(--warn);
  background: rgba(212, 168, 71, 0.07);
}
.timer.danger {
  color: var(--shu);
  border-color: var(--shu);
  background: rgba(74, 155, 200, 0.10);
  animation: pulse 1.4s ease-in-out infinite;
}
.timer.danger::before { opacity: 1; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--shu-glow); }
  50%      { box-shadow: 0 0 0 8px transparent; }
}

/* ============================================================
   QUESTION GRID (NAV)
   ============================================================ */

.qgrid-wrap {
  margin: var(--s-5) 0 var(--s-6);
  padding: var(--s-4);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
}
.qgrid-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--s-3);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-3);
}
.qgrid-meta .legend {
  display: flex;
  gap: var(--s-3);
  font-size: 0.7rem;
}
.qgrid-meta .legend span { display: inline-flex; align-items: center; gap: 4px; }
.qgrid-meta .legend .dot {
  width: 8px; height: 8px; border-radius: 50%;
  display: inline-block;
  background: var(--paper-3);
}
.qgrid-meta .legend .dot.answered { background: var(--ok); }
.qgrid-meta .legend .dot.flagged  { background: var(--warn); }

.qgrid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 4px;
}
@media (max-width: 700px) {
  .qgrid { grid-template-columns: repeat(10, 1fr); }
}
.qgrid button {
  aspect-ratio: 1 / 1;
  background: var(--ink-3);
  border: 1px solid transparent;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--paper-2);
  padding: 0;
  position: relative;
  transition: transform var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}
.qgrid button:hover {
  background: var(--ink-4);
  color: var(--paper-0);
  transform: scale(1.08);
  z-index: 2;
}
.qgrid button.answered {
  background: rgba(138, 171, 111, 0.18);
  color: var(--ok);
}
.qgrid button.answered::after {
  content: "";
  position: absolute;
  bottom: 3px; left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 1px;
  background: var(--ok);
}
.qgrid button.flagged::before {
  content: "";
  position: absolute;
  top: 2px; right: 2px;
  width: 0; height: 0;
  border-left: 6px solid transparent;
  border-bottom: 6px solid var(--warn);
}
.qgrid button.current {
  background: var(--shu);
  color: var(--paper-0);
  z-index: 1;
}
.qgrid button.current::after {
  content: "";
  position: absolute;
  inset: -3px;
  border: 1px solid var(--shu);
  pointer-events: none;
}

/* ============================================================
   QUESTION CARD
   ============================================================ */

.question-card {
  position: relative;
  margin-top: var(--s-5);
  padding: var(--s-6) var(--s-6) var(--s-7);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
}
.question-card::before {
  /* subtle accent edge */
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--shu);
}

.q-header {
  display: flex;
  align-items: baseline;
  gap: var(--s-4);
  margin-bottom: var(--s-5);
  padding-bottom: var(--s-4);
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}
.q-header .q-number {
  font-family: "Shippori Mincho B1", serif;
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  color: var(--paper-0);
}
.q-header .q-number .total {
  font-size: 1rem;
  color: var(--paper-3);
  font-weight: 400;
  margin-left: var(--s-2);
}

.section-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 4px var(--s-3);
  border-radius: var(--r-pill);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.section-chip.script-vocab { color: var(--sec-1); }
.section-chip.convo-expr   { color: var(--sec-2); }
.section-chip.listening    { color: var(--sec-3); }
.section-chip.reading      { color: var(--sec-4); }
.section-chip .ja-label {
  font-family: "Shippori Mincho B1", serif;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  text-transform: none;
  margin-left: var(--s-1);
  color: inherit;
  opacity: 0.78;
}

.context-block {
  background: var(--ink-2);
  border-left: 3px solid var(--paper-3);
  padding: var(--s-4) var(--s-5);
  margin: var(--s-4) 0;
  white-space: pre-wrap;
  font-family: "Shippori Mincho B1", serif;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper-1);
  border-radius: 0 var(--r-1) var(--r-1) 0;
}

.audio-controls {
  display: flex;
  gap: var(--s-4);
  align-items: center;
  background: linear-gradient(135deg, var(--ink-2), var(--ink-1));
  border: 1px solid var(--rule);
  border-left: 3px solid var(--sec-3);
  padding: var(--s-4) var(--s-5);
  margin: var(--s-4) 0;
  border-radius: 0 var(--r-1) var(--r-1) 0;
}
.audio-controls .audio-label {
  font-size: 0.88rem;
  color: var(--paper-2);
  flex: 1;
  line-height: 1.4;
}
.audio-controls .audio-label strong { color: var(--paper-0); }

.prompt {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.35rem;
  line-height: 1.6;
  color: var(--paper-0);
  margin: var(--s-5) 0 var(--s-6);
  white-space: pre-wrap;
  letter-spacing: 0.01em;
}

/* ---------- options ---------- */
.options {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.option {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: var(--s-4);
  padding: var(--s-4) var(--s-5);
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
  position: relative;
  overflow: hidden;
  font-size: 1.02rem;
  line-height: 1.5;
}
.option:hover {
  border-color: var(--paper-3);
  background: var(--ink-3);
  transform: translateX(2px);
}
.option .letter {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.4rem;
  font-weight: 700;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  color: var(--paper-1);
  transition: all var(--t-fast) var(--ease);
}
.option .num-hint {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--paper-3);
  letter-spacing: 0.1em;
}
.option input[type="radio"] { display: none; }

.option.selected {
  border-color: var(--shu);
  background: linear-gradient(135deg, rgba(74, 155, 200, 0.14), var(--ink-2));
}
.option.selected .letter {
  background: var(--shu);
  border-color: var(--shu);
  color: var(--paper-0);
  transform: rotate(-2deg);
}

.option.correct {
  border-color: var(--ok);
  background: rgba(138, 171, 111, 0.08);
}
.option.correct .letter {
  background: var(--ok);
  border-color: var(--ok);
  color: var(--ink-0);
}
.option.incorrect {
  border-color: var(--shu-dim);
  background: rgba(74, 155, 200, 0.10);
}
.option.incorrect .letter {
  background: var(--shu-dim);
  border-color: var(--shu-dim);
  color: var(--paper-0);
}

.q-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--s-3);
  margin-top: var(--s-6);
  flex-wrap: wrap;
}
.q-nav .left, .q-nav .right { display: flex; gap: var(--s-2); flex-wrap: wrap; }

/* ============================================================
   MODAL
   ============================================================ */

.backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  animation: fadeIn var(--t-med) var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--ink-1);
  border: 1px solid var(--paper-3);
  padding: var(--s-6);
  max-width: 480px;
  width: calc(100% - 32px);
  box-shadow: var(--sh-2);
  position: relative;
  animation: rise var(--t-med) var(--ease);
}
@keyframes rise { from { transform: translateY(12px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.modal::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--shu);
}
.modal h3 {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.4rem;
  margin-bottom: var(--s-3);
}
.modal .actions {
  display: flex;
  gap: var(--s-3);
  justify-content: flex-end;
  margin-top: var(--s-5);
}

/* ============================================================
   RESULTS PAGE
   ============================================================ */

.score-card {
  margin: var(--s-6) 0;
  padding: var(--s-7);
  border: 1px solid var(--rule);
  background: var(--ink-1);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-7);
  align-items: center;
  position: relative;
  overflow: hidden;
}
.score-card::after {
  content: attr(data-kanji);
  position: absolute;
  right: -40px; top: -40px;
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: 18rem;
  line-height: 0.85;
  color: var(--ink-2);
  user-select: none;
  pointer-events: none;
}
.score-card.pass::after { color: rgba(138, 171, 111, 0.06); }
.score-card.fail::after { color: rgba(74, 155, 200, 0.06); }

@media (max-width: 720px) {
  .score-card { grid-template-columns: 1fr; padding: var(--s-5); }
}

.score-card .score-meta { z-index: 1; }
.score-card .kicker { margin-bottom: var(--s-3); }
.score-card .verdict {
  font-family: "Shippori Mincho B1", serif;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--s-2);
}
.score-card.pass .verdict { color: var(--ok); }
.score-card.fail .verdict { color: var(--shu); }

.score-card .score-meta-line {
  font-size: 0.88rem;
  color: var(--paper-2);
}

.score-card .score-block {
  text-align: right;
  z-index: 1;
}
.score-card .score-number {
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(5rem, 14vw, 9rem);
  line-height: 0.9;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
}
.score-card.pass .score-number { color: var(--ok); }
.score-card.fail .score-number { color: var(--shu); }
.score-card .score-out-of {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  color: var(--paper-2);
  letter-spacing: 0.1em;
}

.section-bars {
  display: grid;
  gap: var(--s-3);
  margin-top: var(--s-4);
}
.section-bar {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  gap: var(--s-4);
  align-items: center;
}
@media (max-width: 720px) {
  .section-bar { grid-template-columns: 1fr; gap: var(--s-1); }
}
.section-bar .label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.section-bar .label .en {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.05rem;
}
.section-bar .label .ja {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--paper-3);
}
.section-bar .bar-track {
  position: relative;
  height: 26px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.section-bar .bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent, var(--ok)), var(--accent, var(--ok)));
  transform-origin: left;
  animation: barIn 900ms var(--ease) both;
}
@keyframes barIn { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.section-bar[data-sec="script-vocab"] .bar-fill { background: var(--sec-1); }
.section-bar[data-sec="convo-expr"]   .bar-fill { background: var(--sec-2); }
.section-bar[data-sec="listening"]    .bar-fill { background: var(--sec-3); }
.section-bar[data-sec="reading"]      .bar-fill { background: var(--sec-4); }
.section-bar .pct {
  font-family: "JetBrains Mono", monospace;
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 50px;
  text-align: right;
}

.wrong-list {
  display: grid;
  gap: var(--s-4);
  margin-top: var(--s-4);
}
.wrong-item {
  border: 1px solid var(--rule);
  background: var(--ink-1);
  padding: var(--s-5);
  border-radius: var(--r-1);
  position: relative;
}
.wrong-item::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--shu-dim);
}
.wrong-item .qid {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--paper-3);
  text-transform: uppercase;
  margin-bottom: var(--s-2);
}
.wrong-item .prompt {
  margin: var(--s-3) 0;
  font-size: 1.05rem;
  font-family: "Shippori Mincho B1", serif;
}
.wrong-item .answers {
  display: flex;
  gap: var(--s-5);
  flex-wrap: wrap;
  margin: var(--s-3) 0;
  font-size: 0.92rem;
}
.wrong-item .answers .yours { color: var(--shu); }
.wrong-item .answers .correct { color: var(--ok); }
.wrong-item .explanation {
  margin-top: var(--s-3);
  padding-top: var(--s-3);
  border-top: 1px dashed var(--rule);
  font-size: 0.95rem;
  color: var(--paper-1);
  line-height: 1.7;
}
.wrong-item .ja-explanation {
  margin-top: var(--s-2);
  font-family: "Shippori Mincho B1", serif;
  color: var(--paper-2);
  font-size: 0.95rem;
}

/* ============================================================
   DRILL MODE (FLASHCARD)
   ============================================================ */

.drill-card {
  margin: var(--s-5) 0;
  padding: var(--s-7) var(--s-6);
  background: linear-gradient(180deg, var(--ink-2), var(--ink-1));
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  text-align: center;
  position: relative;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--s-3);
  animation: rise var(--t-med) var(--ease);
  overflow: hidden;
}
.drill-card[data-side="front"]::after {
  content: "前";
  position: absolute;
  right: var(--s-4); top: var(--s-3);
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--paper-3);
  letter-spacing: 0.04em;
}
.drill-card[data-side="back"]::after {
  content: "答";
  position: absolute;
  right: var(--s-4); top: var(--s-3);
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--shu);
  letter-spacing: 0.04em;
}

.drill-front {
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--paper-0);
  letter-spacing: -0.01em;
}
.drill-kanji {
  font-size: clamp(6rem, 14vw, 11rem);
  line-height: 1;
}
.drill-pattern {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 500;
}
.drill-reading {
  font-size: 1.4rem;
  color: var(--shu);
  letter-spacing: 0.04em;
}
.drill-meaning {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 1.05rem;
  color: var(--paper-1);
  margin-top: var(--s-2);
  max-width: 56ch;
  line-height: 1.55;
}
.drill-pos {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--paper-3);
}
.drill-sub {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-3);
  margin-top: var(--s-4);
}

/* ============================================================
   PRACTICE-MODE INLINE FEEDBACK
   ============================================================ */

.feedback-block {
  margin-top: var(--s-4);
  padding: var(--s-5);
  border: 1px solid var(--rule);
  position: relative;
  background: var(--ink-1);
  animation: rise var(--t-med) var(--ease);
}
.feedback-block::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--paper-3);
}
.feedback-block.correct::before  { background: var(--ok); }
.feedback-block.incorrect::before { background: var(--shu); }
.feedback-block .label {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--s-2);
  display: flex;
  align-items: center;
  gap: var(--s-2);
}
.feedback-block.correct .label   { color: var(--ok); }
.feedback-block.incorrect .label { color: var(--shu); }
.feedback-block .explanation {
  color: var(--paper-1);
  font-size: 0.95rem;
  line-height: 1.7;
}
.feedback-block .ja-explanation {
  color: var(--paper-2);
  font-family: "Shippori Mincho B1", serif;
  font-size: 0.95rem;
  margin-top: var(--s-2);
}

/* ============================================================
   HELP OVERLAY / KEYBOARD SHORTCUTS
   ============================================================ */

.help-toggle {
  position: fixed;
  bottom: var(--s-4);
  right: var(--s-4);
  z-index: 60;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  color: var(--paper-1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "JetBrains Mono", monospace;
  font-weight: 700;
  font-size: 1rem;
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.help-toggle:hover { background: var(--shu); color: var(--paper-0); transform: scale(1.08); }

.help-panel {
  position: fixed;
  bottom: calc(var(--s-4) + 52px);
  right: var(--s-4);
  z-index: 59;
  width: 320px;
  max-width: calc(100vw - 32px);
  background: var(--ink-1);
  border: 1px solid var(--paper-3);
  padding: var(--s-5);
  box-shadow: var(--sh-2);
  transform-origin: bottom right;
  transform: scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.help-panel.open {
  transform: scale(1);
  opacity: 1;
  pointer-events: auto;
}
.help-panel h4 {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: var(--s-3);
}
.help-panel .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  padding: var(--s-2) 0;
  border-bottom: 1px dashed var(--rule);
}
.help-panel .row:last-child { border-bottom: none; }
.help-panel .row .keys { display: flex; gap: var(--s-1); }

/* ============================================================
   TOAST
   ============================================================ */

.toast-host {
  position: fixed;
  bottom: var(--s-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: 70;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  pointer-events: none;
}
.toast {
  background: var(--ink-1);
  border: 1px solid var(--paper-3);
  border-left: 3px solid var(--shu);
  padding: var(--s-3) var(--s-5);
  font-size: 0.9rem;
  color: var(--paper-0);
  box-shadow: var(--sh-1);
  animation: toastIn var(--t-med) var(--ease), toastOut var(--t-med) var(--ease) 3.2s forwards;
  pointer-events: auto;
}
@keyframes toastIn  { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes toastOut { to { transform: translateY(20px); opacity: 0; } }

/* ============================================================
   ENTRANCE ANIMATIONS
   ============================================================ */

@keyframes stagger {
  from { transform: translateY(8px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}
.stagger > * {
  animation: stagger var(--t-med) var(--ease) both;
}
.stagger > *:nth-child(1) { animation-delay: 0.04s; }
.stagger > *:nth-child(2) { animation-delay: 0.08s; }
.stagger > *:nth-child(3) { animation-delay: 0.12s; }
.stagger > *:nth-child(4) { animation-delay: 0.16s; }
.stagger > *:nth-child(5) { animation-delay: 0.20s; }
.stagger > *:nth-child(6) { animation-delay: 0.24s; }
.stagger > *:nth-child(7) { animation-delay: 0.28s; }
.stagger > *:nth-child(8) { animation-delay: 0.32s; }

/* ============================================================
   FOOTER + LICENSE + ABOUT
   ============================================================ */

.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--s-9);
  padding: var(--s-5) var(--s-6);
  border-top: 1px solid var(--rule);
  background: rgba(12, 18, 24, 0.7);
  font-size: 0.82rem;
}
.site-footer .footer-row {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
  flex-wrap: wrap;
  color: var(--paper-2);
}
.site-footer a { color: var(--paper-1); transition: color var(--t-fast) var(--ease); }
.site-footer a:hover { color: var(--shu); }

.license-card {
  position: relative;
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  padding: var(--s-6);
  margin-bottom: var(--s-7);
}
.license-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--shu);
}
.license-card .license-line {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.15rem;
  margin-bottom: var(--s-3);
}
.license-card .license-line .ja-mark {
  color: var(--shu);
  font-weight: 700;
  margin-right: var(--s-1);
}
.license-card h3 {
  margin-top: var(--s-5);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-2);
  font-weight: 500;
}
.license-card ul {
  margin: var(--s-2) 0 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: var(--s-2);
  font-size: 0.95rem;
  color: var(--paper-1);
}
.license-card ul li {
  padding-left: var(--s-4);
  position: relative;
}
.license-card ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--shu);
}
.license-card p { color: var(--paper-1); margin: var(--s-3) 0 0; }

.ack-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--s-2);
  margin: 0 0 var(--s-7);
  color: var(--paper-1);
}
.ack-list li::before {
  content: "—";
  color: var(--shu);
  margin-right: var(--s-2);
}

/* ============================================================
   LOGIN PAGE
   ============================================================ */

.login-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  padding: var(--s-7) var(--s-5);
}

.login-card {
  position: relative;
  max-width: 420px;
  width: 100%;
  padding: var(--s-7) var(--s-6);
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  box-shadow: var(--sh-2);
  animation: rise var(--t-med) var(--ease);
}
.login-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--shu);
}

.login-title {
  font-family: "Shippori Mincho B1", serif;
  font-size: 1.8rem;
  font-weight: 700;
  margin: var(--s-3) 0 var(--s-2);
  letter-spacing: -0.01em;
}

.login-card .field {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
  margin: var(--s-4) 0;
}
.login-card .field span {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper-3);
}
.login-card input {
  background: var(--ink-0);
  border: 1px solid var(--rule);
  border-radius: var(--r-1);
  padding: var(--s-3) var(--s-4);
  font: inherit;
  font-size: 1rem;
  color: var(--paper-0);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.login-card input:focus {
  border-color: var(--shu);
  outline: none;
  background: var(--ink-2);
  box-shadow: 0 0 0 3px var(--shu-glow);
}

.login-error {
  margin: var(--s-3) 0;
  padding: var(--s-3) var(--s-4);
  background: rgba(194, 85, 84, 0.12);
  border: 1px solid var(--bad);
  border-radius: var(--r-1);
  color: var(--bad);
  font-size: 0.9rem;
}

.login-card .btn {
  width: 100%;
  justify-content: center;
  margin-top: var(--s-4);
}

/* ============================================================
   UTILITIES
   ============================================================ */
.hidden { display: none !important; }
.row { display: flex; gap: var(--s-3); align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.divider {
  height: 1px;
  background: var(--rule);
  margin: var(--s-5) 0;
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============================================================
   MOBILE TUNING
   ============================================================ */

@media (max-width: 720px) {
  .hero-kanji { display: none; }
  .score-card::after { font-size: 12rem; right: -20px; top: -20px; }
}

@media (max-width: 600px) {
  main { padding: var(--s-4); }
  .site-header { padding: var(--s-4); }
  .site-header .brand .mark { font-size: 1.5rem; }
  .question-card { padding: var(--s-4); }
  .q-header .q-number { font-size: 2rem; }
  .prompt { font-size: 1.1rem; }
  .option { grid-template-columns: auto 1fr; gap: var(--s-3); padding: var(--s-3) var(--s-4); }
  .option .num-hint { display: none; }
  .option .letter { font-size: 1.15rem; width: 30px; height: 30px; }
  .timer { font-size: 1.3rem; padding: var(--s-1) var(--s-3); }
  .exam-toolbar { grid-template-columns: 1fr auto auto; padding: var(--s-3); }
  .exam-toolbar .title { grid-column: 1 / -1; order: -1; font-size: 0.9rem; }
  .help-toggle { bottom: var(--s-3); right: var(--s-3); }
  .intro .lead-kana { font-size: 2.4rem; }
  .step-label .text { font-size: 1.1rem; }
  .mode-card::before { font-size: 4.5rem; }
  .qgrid-meta .legend { font-size: 0.6rem; gap: var(--s-2); flex-wrap: wrap; }
}