/* SPI3-H 勉強サイト – 紙ノート風 和モダン */

:root, [data-theme="light"] {
  /* paper / ink palette */
  --paper: #f6f1e7;
  --paper-2: #ede5d3;
  --paper-line: #d9cfb8;
  --ink: #1d1a16;
  --ink-2: #3d3830;
  --ink-soft: #6b6457;
  --ink-faint: #a59c89;
  --accent: #b8443a;        /* 朱 */
  --accent-soft: #d97a6b;
  --accent-bg: #f3d9d3;
  --indigo: #2f4858;        /* 藍墨 */
  --gold: #b8893a;
  --green: #4a6b3a;
  --correct-bg: #e6ecdb;
  --wrong-bg: #f3d9d3;
  --card-bg: #fdfaf2;
  --shadow-sm: 0 1px 2px rgba(29,26,22,0.08);
  --shadow-md: 0 4px 14px rgba(29,26,22,0.10);
  --shadow-lg: 0 12px 40px rgba(29,26,22,0.14);
  --radius: 6px;
  --radius-lg: 14px;
  --serif: 'Noto Serif JP', 'Hiragino Mincho ProN', serif;
  --sans: 'Zen Kaku Gothic New', 'Noto Sans JP', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}

[data-theme="dark"] {
  --paper: #16181c;
  --paper-2: #1f2228;
  --paper-line: #2d3138;
  --ink: #ece8df;
  --ink-2: #c9c3b6;
  --ink-soft: #8d8779;
  --ink-faint: #5a5648;
  --accent: #e07566;
  --accent-soft: #c9574a;
  --accent-bg: #3a2422;
  --indigo: #7a99af;
  --gold: #d4a456;
  --green: #8db367;
  --correct-bg: #243024;
  --wrong-bg: #3a2422;
  --card-bg: #1c1f24;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.45);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.55);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
}

body {
  /* very subtle paper grain */
  background-image:
    radial-gradient(rgba(120,100,60,0.04) 1px, transparent 1px),
    radial-gradient(rgba(120,100,60,0.03) 1px, transparent 1px);
  background-size: 28px 28px, 18px 18px;
  background-position: 0 0, 9px 9px;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}
[data-theme="dark"] body {
  background-image:
    radial-gradient(rgba(255,240,200,0.025) 1px, transparent 1px),
    radial-gradient(rgba(255,240,200,0.018) 1px, transparent 1px);
}

button { font-family: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.5; }

/* Force-white canvas — used for handwriting/calc so it stays a paper surface even in dark mode */
.paper-canvas {
  background:
    linear-gradient(to right, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(to bottom, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 32px 32px,
    #fdfaf2 !important;
}
.paper-canvas.kanji-paper {
  background:
    linear-gradient(to right, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 25% 25%,
    linear-gradient(to bottom, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 25% 25%,
    radial-gradient(circle, rgba(180,170,150,0.5) 1px, transparent 1.5px) center / 100% 100% no-repeat,
    #fdfaf2 !important;
  border: 2px solid #d9cfb8 !important;
}

/* ---------- THEME TOGGLE ---------- */
.theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  color: var(--ink-2);
  padding: 6px 12px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.theme-toggle:hover {
  border-color: var(--ink-faint);
  color: var(--ink);
}

/* ---------- LAYOUT ---------- */
.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px 80px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--paper-line);
  margin-bottom: 36px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.brand-mark {
  width: 38px; height: 38px;
  background: var(--ink);
  color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 20px;
  border-radius: 4px;
  align-self: center;
  letter-spacing: -0.02em;
}
.brand-mark .accent { color: var(--accent-soft); }
.brand-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  margin: 0;
}
.brand-sub {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.18em;
  font-family: var(--mono);
}

.topbar-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--paper-line);
  background: transparent;
  color: var(--ink-2);
  transition: all 0.15s ease;
  font-family: var(--sans);
}
.btn:hover:not(:disabled) {
  background: var(--paper-2);
  border-color: var(--ink-faint);
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover:not(:disabled) {
  background: var(--ink-2);
  border-color: var(--ink-2);
  color: var(--paper);
}
.btn-accent {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
.btn-accent:hover:not(:disabled) {
  background: #a13a31;
  color: var(--paper);
}
.btn-ghost { border-color: transparent; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 13px 22px; font-size: 16px; }

/* ---------- HOME ---------- */
.hero {
  padding: 28px 0 18px;
  border-bottom: 1px solid var(--paper-line);
  margin-bottom: 36px;
}
.hero-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.hero-title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 56px;
  line-height: 1.15;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
}
.hero-title .accent { color: var(--accent); }
.hero-lead {
  font-size: 17px;
  color: var(--ink-2);
  max-width: 620px;
  margin: 0;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 36px 0 44px;
}
.stat-card {
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
}
.stat-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.stat-value {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--ink);
}
.stat-value-sub { font-size: 14px; color: var(--ink-soft); margin-left: 4px; font-family: var(--sans); }
.stat-bar {
  margin-top: 10px;
  height: 4px;
  background: var(--paper-line);
  border-radius: 2px;
  overflow: hidden;
}
.stat-bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
}

.section-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 24px;
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.section-title .num {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.1em;
}
.section-sub {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 22px;
}

.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 50px;
}
.cat-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: 22px 22px 18px;
  text-align: left;
  color: var(--ink);
  transition: all 0.18s ease;
  position: relative;
  overflow: hidden;
  font-family: var(--sans);
  cursor: pointer;
}
.cat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--ink-faint);
}
.cat-card .cat-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 10px;
}
.cat-card .cat-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.3;
  margin-bottom: 6px;
}
.cat-card .cat-desc {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 18px;
  flex: 1;
}
.cat-card .cat-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
  border-top: 1px dashed var(--paper-line);
  padding-top: 12px;
}
.cat-card .cat-progress {
  display: flex;
  align-items: center;
  gap: 8px;
}
.cat-card .cat-progress-bar {
  width: 50px;
  height: 3px;
  background: var(--paper-line);
  border-radius: 2px;
  overflow: hidden;
}
.cat-card .cat-progress-fill {
  height: 100%;
  background: var(--accent);
}
.cat-card.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.cat-card.disabled:hover { transform: none; box-shadow: none; }

/* ---------- MODE PICKER (within category) ---------- */
.mode-row {
  display: flex;
  gap: 10px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}
.mode-btn {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--paper-line);
  background: var(--paper-2);
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 500;
  font-family: var(--sans);
}
.mode-btn:hover { border-color: var(--ink-faint); }
.mode-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ---------- QUIZ ---------- */
.quiz-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px 80px;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  border-bottom: 1px solid var(--paper-line);
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}
.quiz-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}
.quiz-cat {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
}
.quiz-cat .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-right: 10px;
}
.quiz-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
}
.quiz-progress-bar {
  width: 200px;
  height: 5px;
  background: var(--paper-line);
  border-radius: 3px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--ink);
  transition: width 0.25s ease;
}

.quiz-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.quiz-grid.with-canvas {
  grid-template-columns: 1.05fr 1fr;
}

.canvas-collapsible {
  margin-top: 18px;
  border: 1.5px solid var(--paper-line);
  border-radius: 8px;
  background: var(--paper);
  overflow: hidden;
  animation: slideDown 0.18s ease-out;
}
.canvas-collapsible-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--paper-2);
  border-bottom: 1px solid var(--paper-line);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}
.btn.btn-active {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 960px) {
  .quiz-grid.with-canvas { grid-template-columns: 1fr; }
}

.q-card {
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: 30px 32px;
  box-shadow: var(--shadow-sm);
}
.q-num-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 14px;
}
.q-prompt {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 24px;
}
.q-prompt ruby rt {
  font-size: 0.5em;
  color: var(--ink-soft);
  font-family: var(--sans);
  font-weight: 400;
  letter-spacing: 0;
}
.q-prompt.no-furigana ruby rt { display: none; }

.q-passage {
  background: var(--paper-2);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 2;
  white-space: pre-wrap;
}
.q-passage.no-furigana ruby rt { display: none; }

.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}
.choice {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  text-align: left;
  font-size: 15px;
  color: var(--ink);
  transition: all 0.12s ease;
  font-family: var(--sans);
  width: 100%;
}
.choice:hover:not(:disabled) {
  border-color: var(--ink-faint);
  background: var(--card-bg);
}
.choice.selected {
  border-color: var(--ink);
  background: var(--card-bg);
  box-shadow: 0 0 0 2px var(--ink) inset;
}
.choice.correct {
  border-color: var(--green);
  background: var(--correct-bg);
}
.choice.wrong {
  border-color: var(--accent);
  background: var(--wrong-bg);
}
.choice .ch-letter {
  width: 26px; height: 26px;
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
  flex-shrink: 0;
}
.choice.selected .ch-letter { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.choice.correct .ch-letter { background: var(--green); color: var(--paper); border-color: var(--green); }
.choice.wrong .ch-letter { background: var(--accent); color: var(--paper); border-color: var(--accent); }
.choice .ch-text ruby rt { font-size: 0.55em; color: var(--ink-soft); font-family: var(--sans); }
.choice.no-furigana .ch-text ruby rt { display: none; }

/* ---------- TOOLBAR ---------- */
.q-toolbar {
  display: flex;
  gap: 8px;
  margin-top: 22px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px dashed var(--paper-line);
}
.q-toolbar .toolbar-spacer { flex: 1; }

/* ---------- FURIGANA TOGGLE ---------- */
.furigana-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px;
  font-family: var(--mono);
  color: var(--ink-soft);
  letter-spacing: 0.05em;
}
.toggle-switch {
  width: 32px; height: 18px;
  background: var(--paper-line);
  border-radius: 9px;
  position: relative;
  cursor: pointer;
  border: none;
  padding: 0;
  transition: background 0.18s;
}
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 14px; height: 14px;
  background: var(--paper);
  border-radius: 50%;
  transition: transform 0.18s;
}
.toggle-switch.on { background: var(--ink); }
.toggle-switch.on::after { transform: translateX(14px); }

/* ---------- CANVAS PAD ---------- */
.canvas-pad {
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 20px;
  align-self: start;
  max-height: calc(100vh - 40px);
}
.canvas-pad-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--paper-line);
  background: var(--paper-2);
}
.canvas-pad-title {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
  text-transform: uppercase;
}
.canvas-tools {
  display: flex;
  align-items: center;
  gap: 6px;
}
.color-dot {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.color-dot.active {
  border-color: var(--ink);
  box-shadow: 0 0 0 1px var(--paper);
}
.canvas-wrap {
  flex: 1;
  background:
    linear-gradient(to right, rgba(180,170,150,0.12) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(to bottom, rgba(180,170,150,0.12) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--card-bg);
  position: relative;
  min-height: 480px;
}
[data-theme="dark"] .canvas-wrap {
  background:
    linear-gradient(to right, rgba(255,240,200,0.06) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(to bottom, rgba(255,240,200,0.06) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--card-bg);
}
.kanji-canvas-wrap {
  height: 320px !important;
  max-height: 320px !important;
  flex: none !important;
}
.kanji-canvas-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}
.canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}
.canvas-pad-footer {
  padding: 8px 16px;
  border-top: 1px solid var(--paper-line);
  font-size: 11px;
  color: var(--ink-faint);
  font-family: var(--mono);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ---------- EXPLANATION ---------- */
.explanation {
  margin-top: 24px;
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: 0;
  overflow: hidden;
}
.exp-tabs {
  display: flex;
  border-bottom: 1px solid var(--paper-line);
  background: var(--card-bg);
}
.exp-tab {
  flex: 1;
  padding: 12px 14px;
  background: none;
  border: none;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  position: relative;
}
.exp-tab.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
  background: var(--paper-2);
}
.exp-tab .exp-tab-jp { font-family: var(--serif); font-weight: 700; font-size: 15px; }
.exp-tab .exp-tab-tag {
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 2px;
  text-transform: uppercase;
}
.exp-body {
  padding: 22px 26px;
  font-size: 15px;
  line-height: 1.95;
}
.exp-body h4 {
  font-family: var(--serif);
  margin: 0 0 10px;
  font-size: 16px;
}
.exp-body p { margin: 0 0 12px; }
.exp-body p:last-child { margin-bottom: 0; }
.exp-body .formula {
  background: var(--card-bg);
  border: 1px dashed var(--paper-line);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 14px;
  margin: 10px 0;
  color: var(--ink-2);
}
.exp-body .step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 14px;
}
.exp-body .step-num {
  flex-shrink: 0;
  width: 26px; height: 26px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 13px;
}
.exp-body .trick-box {
  background: var(--accent-bg);
  border-left: 4px solid var(--accent);
  padding: 14px 18px;
  border-radius: var(--radius);
  margin: 12px 0;
}
.exp-body .trick-title {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
  font-size: 15px;
}

/* ---------- KANJI PRACTICE MODAL ---------- */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(29,26,22,0.45);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.18s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--paper);
  border-radius: var(--radius-lg);
  width: min(880px, 96vw);
  max-height: 92vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--paper-line);
}
.modal-title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 20px;
  margin: 0;
}
.modal-close {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--paper-line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--ink-2);
}
.modal-close:hover { background: var(--paper-2); }
.modal-body {
  padding: 22px;
  overflow-y: auto;
  flex: 1;
}

.kanji-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.kanji-chip {
  padding: 8px 14px;
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  font-family: var(--serif);
  font-size: 22px;
  cursor: pointer;
}
.kanji-chip.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.kanji-chip ruby rt { font-size: 0.4em; color: var(--ink-soft); font-family: var(--sans); }
.kanji-chip.active ruby rt { color: var(--paper-line); }

.kanji-practice-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 22px;
}
@media (max-width: 720px) {
  .kanji-practice-grid { grid-template-columns: 1fr; }
}
.kanji-stencil {
  background: #fdfaf2 !important;
  border: 1px solid #d9cfb8 !important;
  border-radius: var(--radius-lg);
  padding: 18px;
  text-align: center;
}
.kanji-big {
  font-family: var(--serif);
  font-weight: 900;
  color: #1d1a16 !important;
  font-size: 130px;
  line-height: 1;
  color: var(--ink);
  margin: 14px 0 8px;
}
.kanji-stencil .reading {
  font-size: 13px;
  color: #6b6457 !important;
  font-family: var(--mono);
  margin-bottom: 4px;
}
.kanji-stencil .reading-label {
  font-size: 10px;
  color: #a59c89 !important;
  font-family: var(--mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.kanji-stencil .meaning {
  font-size: 13px;
  color: #3d3830 !important;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--paper-line);
}

.kanji-canvas-wrap {
  background:
    linear-gradient(to right, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 25% 100%,
    linear-gradient(to bottom, rgba(180,170,150,0.18) 1px, transparent 1px) 0 0 / 100% 25%,
    radial-gradient(circle, rgba(180,170,150,0.5) 1px, transparent 1.5px) center / 100% 100% no-repeat,
    var(--card-bg);
  border: 2px solid var(--paper-line);
  border-radius: var(--radius);
  position: relative;
  min-height: 380px;
  overflow: hidden;
}
.kanji-canvas-wrap::before,
.kanji-canvas-wrap::after {
  content: '';
  position: absolute;
  background: rgba(180,170,150,0.4);
}
.kanji-canvas-wrap::before {
  /* diagonal */
  top: 0; left: 50%;
  width: 1px; height: 100%;
  background: linear-gradient(to bottom, transparent 0, rgba(180,170,150,0.4) 50%, transparent 100%);
}
.kanji-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 2;
  touch-action: none;
}

/* ---------- RESULT ---------- */
.result-shell {
  max-width: 880px;
  margin: 0 auto;
  padding: 60px 28px 80px;
  text-align: center;
}
.result-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.result-score {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 120px;
  line-height: 1;
  color: var(--ink);
  margin: 10px 0;
}
.result-score .total {
  font-size: 48px;
  color: var(--ink-faint);
  font-weight: 500;
}
.result-percent {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--accent);
  margin-bottom: 10px;
  letter-spacing: 0.1em;
}
.result-msg {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--ink-2);
  margin-bottom: 36px;
}

.review-list {
  text-align: left;
  margin-top: 36px;
}
.review-item {
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 14px;
}
.review-item.is-correct { border-left: 4px solid var(--green); }
.review-item.is-wrong { border-left: 4px solid var(--accent); }
.review-item .review-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
}
.review-item .review-status {
  color: var(--green);
  font-weight: 600;
}
.review-item.is-wrong .review-status { color: var(--accent); }
.review-item .review-q {
  font-family: var(--serif);
  font-size: 16px;
  margin-bottom: 10px;
  line-height: 1.7;
}
.review-item .review-ans {
  font-size: 13px;
  color: var(--ink-soft);
  font-family: var(--mono);
}

/* ---------- UTIL ---------- */
.text-center { text-align: center; }
.gap-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.divider { height: 1px; background: var(--paper-line); margin: 28px 0; }

@media (max-width: 720px) {
  .hero-title { font-size: 38px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: 1fr; }
  .quiz-grid.with-canvas { grid-template-columns: 1fr; }
  .canvas-pad { position: relative; max-height: 500px; }
}


/* ---------- CUSTOM QUIZ BANNER (HOME) ---------- */
.custom-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin: 28px 0 36px;
  padding: 22px 28px;
  background: linear-gradient(135deg, var(--indigo) 0%, #1f3340 100%);
  color: #f6f1e7;
  border: none;
  border-radius: var(--radius-lg);
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  box-shadow: var(--shadow-md);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}
.custom-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 90% 20%, rgba(255,210,140,0.16), transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(184,68,58,0.20), transparent 45%);
  pointer-events: none;
}
.custom-banner:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}
.custom-banner-left { position: relative; z-index: 1; }
.custom-banner-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: #e0c98c;
  margin-bottom: 6px;
}
.custom-banner-title {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}
.custom-banner-sub {
  font-size: 13px;
  color: rgba(246,241,231,0.75);
  letter-spacing: 0.04em;
}
.custom-banner-arrow {
  position: relative;
  z-index: 1;
  font-size: 36px;
  color: #f6f1e7;
  transition: transform 0.18s ease;
}
.custom-banner:hover .custom-banner-arrow { transform: translateX(6px); }

/* ---------- CUSTOM QUIZ BUILDER ---------- */
.cb-hero {
  margin: 18px 0 36px;
}
.cb-section {
  margin-bottom: 36px;
}
.cb-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.cb-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
@media (max-width: 760px) {
  .cb-list { grid-template-columns: 1fr; }
}
.cb-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  font-family: inherit;
  color: var(--ink);
}
.cb-row:hover {
  border-color: var(--ink-faint);
}
.cb-row.checked {
  border-color: var(--ink);
  background: var(--paper-2);
}
.cb-box {
  flex: none;
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--ink-faint);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: transparent;
  background: var(--card-bg);
  transition: all 0.15s ease;
}
.cb-box.checked {
  background: var(--ink);
  border-color: var(--ink);
  color: #f6f1e7;
}
.cb-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cb-name {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.cb-desc {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.5;
}
.cb-meta {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  font-family: var(--mono);
  font-size: 11px;
}
.cb-count {
  color: var(--ink-2);
  font-weight: 600;
}
.cb-rate {
  color: var(--ink-faint);
  font-size: 10px;
}
.cb-count-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}
@media (max-width: 540px) {
  .cb-count-row { grid-template-columns: 1fr; }
}
.cb-count-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 22px 18px;
  background: var(--card-bg);
  border: 1px solid var(--paper-line);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-family: inherit;
  color: var(--ink);
  transition: all 0.15s ease;
}
.cb-count-btn:hover:not(:disabled) {
  border-color: var(--ink-faint);
}
.cb-count-btn.active {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
  box-shadow: var(--shadow-sm);
}
.cb-count-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.cb-count-num {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
}
.cb-count-unit {
  font-size: 13px;
  margin-top: -4px;
}
.cb-count-time {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: 0.7;
  margin-top: 4px;
}
.cb-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  background: var(--paper-2);
  border: 1px dashed var(--paper-line);
  border-radius: var(--radius-lg);
  margin-top: 24px;
}
.cb-summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cb-summary-line {
  display: flex;
  gap: 14px;
  font-family: var(--mono);
  font-size: 13px;
}
.cb-summary-label {
  color: var(--ink-soft);
  min-width: 88px;
}
.cb-summary-val {
  color: var(--ink-2);
  font-weight: 600;
}
.cb-summary-val-strong {
  color: var(--accent);
  font-size: 15px;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
  letter-spacing: 0.05em;
}


/* ---------- DIAGRAMS ---------- */
.diagram-wrap {
  margin: 8px 0 22px;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.diagram-title {
  background: var(--paper-2);
  padding: 8px 14px;
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.12em;
  color: var(--ink-2);
  border-bottom: 1px solid var(--paper-line);
}
.diagram-svg-box {
  /* Always paper-light so SVG ink reads in dark mode */
  background:
    radial-gradient(rgba(120,100,60,0.05) 1px, transparent 1px) 0 0 / 18px 18px,
    #fdfaf2 !important;
  padding: 14px;
}
.diagram-svg {
  width: 100%;
  height: auto;
  display: block;
}


/* ============================================================
   APP HEADER (sticky top bar)
   ============================================================ */
.app-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--paper-line);
}
.app-header-inner {
  max-width: 1100px; margin: 0 auto;
  padding: 12px 28px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
}
.app-header-brand {
  display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none;
}
.app-logo-mark {
  font-family: var(--serif); font-weight: 900; font-size: 20px; line-height: 1;
  color: var(--paper); background: var(--ink);
  padding: 6px 9px; border-radius: 6px; letter-spacing: 0.04em;
}
.app-logo-name {
  font-family: var(--serif); font-weight: 700; font-size: 17px;
  color: var(--ink); letter-spacing: 0.05em;
}
.app-header-right {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: flex-end;
}
.free-meter {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 12px;
  background: var(--card-bg); border: 1px solid var(--paper-line); border-radius: 999px;
}
.free-meter-bar {
  width: 80px; height: 5px; background: var(--paper-2);
  border-radius: 999px; overflow: hidden;
}
.free-meter-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--gold) 70%, var(--accent));
  transition: width 0.3s ease;
}
.free-meter-text {
  font-family: var(--mono); font-size: 12px; color: var(--ink-soft); letter-spacing: 0.04em;
}
.free-meter-text strong { color: var(--ink); font-weight: 600; }
.premium-badge-bar {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  background: linear-gradient(135deg, var(--gold), #d9a04a);
  color: #1d1a16;
  border-radius: 999px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em;
  box-shadow: 0 2px 6px rgba(184,137,58,0.35);
}

/* User menu trigger + popup */
.user-menu-wrap { position: relative; }
.user-menu-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 4px 12px 4px 4px;
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 999px; cursor: pointer;
  transition: border-color 0.15s ease;
  font-family: var(--sans);
}
.user-menu-btn:hover { border-color: var(--ink-faint); }
.user-avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--indigo); color: var(--paper);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 700; font-size: 14px;
  flex-shrink: 0;
}
.user-avatar.premium {
  background: linear-gradient(135deg, var(--gold), var(--accent));
  box-shadow: 0 0 0 2px var(--gold);
}
.user-avatar.lg { width: 44px; height: 44px; font-size: 19px; }
.user-avatar.xl { width: 64px; height: 64px; font-size: 28px; }
.user-name-inline {
  font-size: 13px; color: var(--ink-2);
  max-width: 120px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.premium-pill {
  font-size: 9px; font-weight: 800; letter-spacing: 0.1em;
  background: var(--gold); color: var(--paper);
  padding: 2px 6px; border-radius: 4px;
}
.user-menu-pop {
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 240px;
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 10px; box-shadow: var(--shadow-lg);
  padding: 6px; z-index: 60;
}
.user-menu-pop hr { border: none; border-top: 1px solid var(--paper-line); margin: 6px 0; }
.user-menu-head {
  display: flex; gap: 12px; align-items: center;
  padding: 12px; border-bottom: 1px solid var(--paper-line);
  margin-bottom: 6px;
}
.user-menu-name { font-weight: 700; color: var(--ink); font-size: 14px; }
.user-menu-email { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); margin-top: 2px; }
.plan-badge {
  display: inline-block; margin-top: 4px;
  font-size: 10px; font-weight: 700; letter-spacing: 0.08em;
  padding: 2px 8px; border-radius: 999px;
}
.plan-badge.free { background: var(--paper-2); color: var(--ink-soft); }
.plan-badge.premium {
  background: linear-gradient(135deg, var(--gold), #d9a04a);
  color: #1d1a16;
}
.user-menu-item {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 9px 12px;
  background: none; border: none; text-align: left;
  font-size: 13px; color: var(--ink-2);
  border-radius: 6px; font-family: var(--sans); cursor: pointer;
}
.user-menu-item:hover { background: var(--paper-2); color: var(--ink); }
.user-menu-item.danger { color: var(--accent); }
.user-menu-item.highlight {
  background: var(--accent-bg); color: var(--accent); font-weight: 700;
}
.user-menu-item.highlight:hover { background: var(--accent); color: var(--paper); }

/* ============================================================
   HOME ACTION ROW
   ============================================================ */
.home-action-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
  margin: 30px 0 50px;
}
@media (max-width: 880px) { .home-action-row { grid-template-columns: repeat(2, 1fr); } }
.action-card {
  display: flex; flex-direction: column; gap: 6px; align-items: flex-start; text-align: left;
  padding: 18px 18px 16px;
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  font-family: var(--sans); color: var(--ink);
  position: relative; overflow: hidden;
}
.action-card:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--ink-faint);
}
.action-card.primary {
  background: var(--ink); color: var(--paper); border-color: var(--ink);
}
.action-card.primary .action-sub { color: rgba(246,241,231,0.65); }
.action-card.primary .action-icon { color: var(--accent-soft); }
.action-card.locked::after {
  content: ""; position: absolute; inset: 0;
  background: repeating-linear-gradient(135deg, transparent 0 6px, color-mix(in srgb, var(--paper-line) 40%, transparent) 6px 7px);
  pointer-events: none; opacity: 0.4;
}
.action-icon {
  font-size: 24px; line-height: 1; margin-bottom: 4px; color: var(--accent);
}
.action-name {
  font-family: var(--serif); font-weight: 700; font-size: 17px; letter-spacing: 0.02em;
}
.action-name .lock { font-size: 12px; margin-left: 4px; opacity: 0.7; }
.action-sub { font-size: 12px; color: var(--ink-soft); letter-spacing: 0.02em; }

/* ============================================================
   AUTH PAGE
   ============================================================ */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 40px 24px;
}
.auth-card {
  width: 100%; max-width: 460px;
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 16px; box-shadow: var(--shadow-md);
  padding: 36px 32px 28px;
}
.auth-brand {
  display: flex; align-items: center; gap: 12px; justify-content: center; margin-bottom: 20px;
}
.auth-logo {
  font-family: var(--serif); font-weight: 900; font-size: 26px;
  color: var(--paper); background: var(--ink);
  padding: 8px 12px; border-radius: 6px; letter-spacing: 0.04em;
  line-height: 1;
}
.auth-brand-jp { font-family: var(--serif); font-weight: 800; font-size: 22px; color: var(--ink); }
.auth-brand-sub { font-size: 11px; color: var(--ink-soft); margin-top: 2px; letter-spacing: 0.05em; }
.auth-tabs {
  display: flex; gap: 4px;
  background: var(--paper-2);
  padding: 4px; border-radius: 10px;
  margin-bottom: 20px;
}
.auth-tab {
  flex: 1; padding: 9px;
  background: none; border: none; border-radius: 7px;
  font-size: 13px; font-weight: 600;
  color: var(--ink-soft); cursor: pointer;
  font-family: var(--sans);
  transition: background 0.15s ease, color 0.15s ease;
}
.auth-tab.active {
  background: var(--card-bg); color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.oauth-buttons { display: grid; gap: 8px; margin-bottom: 16px; }
.oauth-btn {
  display: flex; align-items: center; gap: 12px;
  width: 100%; padding: 11px 14px;
  background: var(--card-bg); border: 1px solid var(--paper-line); border-radius: 8px;
  font-size: 14px; font-weight: 500; color: var(--ink);
  cursor: pointer; font-family: var(--sans);
  transition: border-color 0.15s, background 0.15s;
}
.oauth-btn:hover { border-color: var(--ink-faint); background: var(--paper-2); }
.oauth-btn svg { flex-shrink: 0; }
.oauth-btn.oauth-google { background: #fff; color: #3c4043; }
.oauth-btn.oauth-google:hover { background: #f8f9fa; }
.oauth-btn.oauth-line { background: #06c755; color: #fff; border-color: #06c755; }
.oauth-btn.oauth-line:hover { background: #05a647; }
.oauth-btn.oauth-apple { background: #000; color: #fff; border-color: #000; }
.oauth-btn.oauth-apple:hover { background: #1d1a16; }

.auth-divider {
  display: flex; align-items: center; gap: 12px;
  font-size: 11px; color: var(--ink-faint); letter-spacing: 0.1em;
  margin: 16px 0;
}
.auth-divider::before, .auth-divider::after {
  content: ""; flex: 1; height: 1px; background: var(--paper-line);
}
.auth-form .form-row { margin-bottom: 12px; }
.form-row label {
  display: block;
  font-size: 12px; color: var(--ink-soft);
  margin-bottom: 6px; letter-spacing: 0.05em;
}
.form-row input, .form-row textarea, .form-row select {
  width: 100%;
  padding: 10px 12px;
  background: var(--paper); border: 1px solid var(--paper-line);
  border-radius: 8px;
  font-size: 14px; font-family: var(--sans); color: var(--ink);
  transition: border-color 0.15s;
}
.form-row input:focus, .form-row textarea:focus { outline: none; border-color: var(--ink-soft); }
.form-row input:disabled { background: var(--paper-2); color: var(--ink-soft); cursor: not-allowed; }
.auth-error {
  font-size: 12px; color: var(--accent);
  margin: -4px 0 12px; padding: 8px 10px;
  background: var(--wrong-bg); border-radius: 6px;
}
.auth-submit {
  width: 100%; margin-top: 6px; padding: 12px;
  letter-spacing: 0.05em;
}
.auth-footer {
  text-align: center; font-size: 13px; color: var(--ink-soft); margin: 16px 0 6px;
}
.link-btn {
  background: none; border: none;
  color: var(--accent); font-weight: 600; cursor: pointer;
  text-decoration: underline; font-size: inherit; font-family: inherit;
}
.auth-skip {
  display: block; width: 100%;
  margin-top: 4px; padding: 10px;
  background: none; border: none;
  font-size: 12px; color: var(--ink-soft);
  text-decoration: underline; cursor: pointer;
  font-family: var(--sans);
}
.auth-skip:hover { color: var(--ink); }
.auth-disclaimer {
  font-size: 11px; color: var(--ink-faint);
  background: var(--paper-2);
  padding: 10px 12px; border-radius: 6px;
  margin-top: 18px; line-height: 1.6;
}

/* ============================================================
   PRICING PAGE
   ============================================================ */
.pricing-page {
  max-width: 1000px; margin: 0 auto;
  padding: 40px 28px 80px;
}
.pricing-head { text-align: center; margin-bottom: 36px; position: relative; }
.pricing-head .btn { position: absolute; left: 0; top: 0; }
.pricing-title {
  font-family: var(--serif); font-weight: 900;
  font-size: 36px; margin: 0 0 8px; letter-spacing: 0.02em;
}
.pricing-sub { color: var(--ink-soft); font-size: 14px; margin: 0; }
.pricing-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
@media (max-width: 760px) { .pricing-grid { grid-template-columns: 1fr; } }
.pricing-card {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 16px; padding: 28px 26px;
  position: relative;
}
.pricing-card.premium {
  border: 2px solid var(--accent);
  background: linear-gradient(180deg, var(--accent-bg) 0%, var(--card-bg) 30%);
}
.pricing-card.current::before {
  content: ""; position: absolute; inset: -1px;
  border: 2px solid var(--green); border-radius: 16px;
  pointer-events: none;
}
.pricing-current-tag {
  position: absolute; top: -12px; right: 24px;
  background: var(--green); color: var(--paper);
  padding: 4px 12px; border-radius: 999px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
}
.pricing-badge {
  position: absolute; top: -12px; left: 24px;
  background: var(--accent); color: var(--paper);
  padding: 4px 12px; border-radius: 999px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
}
.pricing-name {
  font-family: var(--serif); font-weight: 700; font-size: 20px;
  margin: 6px 0 6px;
}
.pricing-price { margin: 12px 0 4px; line-height: 1; }
.pricing-price .num {
  font-family: var(--serif); font-weight: 900; font-size: 42px;
  color: var(--ink);
}
.pricing-price .unit {
  font-size: 14px; font-weight: 500; color: var(--ink-soft); margin-left: 4px;
}
.pricing-tagline { font-size: 13px; color: var(--ink-soft); margin-bottom: 14px; }
.pricing-features {
  list-style: none; padding: 0; margin: 14px 0 22px;
}
.pricing-features li {
  padding: 5px 0; font-size: 13.5px; color: var(--ink-2); line-height: 1.7;
}
.pricing-features li.muted { color: var(--ink-faint); }
.pricing-features li strong { color: var(--accent); }
.btn-block { width: 100%; padding: 12px; justify-content: center; }
.pricing-note { font-size: 11px; color: var(--ink-faint); text-align: center; margin-top: 10px; }

.pricing-faq { margin-top: 50px; }
.pricing-faq h3 {
  font-family: var(--serif); font-weight: 700; font-size: 20px;
  margin: 0 0 18px;
}
.pricing-faq details {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 8px; margin-bottom: 8px; padding: 12px 16px;
}
.pricing-faq summary {
  cursor: pointer; font-weight: 600; font-size: 14px; color: var(--ink);
}
.pricing-faq p { color: var(--ink-soft); font-size: 13px; margin: 10px 0 0; line-height: 1.7; }

/* ============================================================
   CHECKOUT PAGE (Stripe風)
   ============================================================ */
.checkout-page {
  min-height: 100vh; background: var(--paper-2);
  display: flex; align-items: center; justify-content: center;
  padding: 40px 24px;
}
.checkout-card {
  width: 100%; max-width: 460px;
  background: var(--card-bg);
  border-radius: 14px; box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.checkout-head {
  padding: 18px 22px;
  border-bottom: 1px solid var(--paper-line);
  display: flex; align-items: center; justify-content: space-between;
  background: var(--paper);
}
.checkout-merchant { display: flex; align-items: center; gap: 10px; }
.checkout-logo {
  font-family: var(--serif); font-weight: 900; font-size: 14px;
  color: var(--paper); background: var(--ink);
  padding: 5px 8px; border-radius: 4px;
}
.checkout-amount {
  padding: 24px 24px 18px;
}
.checkout-amount-label {
  font-size: 12px; color: var(--ink-soft); letter-spacing: 0.05em;
}
.checkout-amount-value {
  font-family: var(--serif); font-weight: 900; font-size: 36px;
  color: var(--ink); line-height: 1.1;
}
.checkout-form { padding: 0 24px 24px; }
.checkout-secured {
  font-size: 11px; color: var(--ink-soft); text-align: center;
  margin-top: 14px; line-height: 1.6;
}
.checkout-processing {
  padding: 70px 30px; text-align: center;
  font-size: 14px; color: var(--ink-soft);
}
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--paper-line);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.checkout-done { padding: 50px 30px; text-align: center; }
.check-circle {
  width: 64px; height: 64px;
  background: var(--green); color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 18px;
  font-size: 30px; font-weight: 900;
}
.checkout-done-title {
  font-family: var(--serif); font-weight: 800; font-size: 20px;
  color: var(--ink); margin-bottom: 4px;
}

/* ============================================================
   ACCOUNT PAGE
   ============================================================ */
.account-page {
  max-width: 760px; margin: 0 auto;
  padding: 40px 28px 80px;
}
.account-head {
  margin-bottom: 24px;
  display: flex; align-items: center; gap: 14px;
}
.account-head h1 {
  font-family: var(--serif); font-weight: 800; font-size: 28px;
  margin: 0;
}
.account-section {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px; padding: 22px 24px;
  margin-bottom: 16px;
}
.account-section h3 {
  font-family: var(--serif); font-weight: 700; font-size: 17px;
  margin: 0 0 14px;
}
.account-profile {
  display: flex; gap: 18px; align-items: flex-start;
}
.subscription-card {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 18px;
  border-radius: 10px;
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
}
.subscription-card.premium {
  background: linear-gradient(135deg, var(--accent-bg), var(--card-bg));
  border-color: var(--accent);
}
.sub-plan-name {
  font-family: var(--serif); font-weight: 800; font-size: 17px; color: var(--ink);
}
.sub-plan-detail { font-size: 12px; color: var(--ink-soft); margin-top: 2px; }
.account-danger-zone { border: 1px solid var(--accent) !important; }
.account-danger-zone h3 { color: var(--accent); }

/* ============================================================
   UPGRADE MODAL + USER SWITCH MODAL
   ============================================================ */
.modal-box {
  background: var(--card-bg);
  border-radius: 14px;
  max-width: 460px; width: 100%;
  max-height: calc(100vh - 32px);
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
  margin: 16px;
  -webkit-overflow-scrolling: touch;
}
.modal-backdrop {
  /* allow inner scroll on short viewports */
  overflow-y: auto;
  padding: 0;
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--paper-line);
}
.modal-head h3 {
  font-family: var(--serif); font-weight: 700; font-size: 16px; margin: 0;
}
.upgrade-modal-body {
  padding: 28px 26px 24px;
  text-align: center;
}
.upgrade-modal-icon { font-size: 38px; margin-bottom: 10px; }
.upgrade-modal-body h2 {
  font-family: var(--serif); font-weight: 800; font-size: 22px;
  margin: 4px 0 8px;
}
.upgrade-modal-body p {
  font-size: 14px; color: var(--ink-soft);
  margin: 0 0 20px; line-height: 1.7;
}
.upgrade-modal-actions {
  display: flex; gap: 10px; flex-direction: column;
}
.upgrade-modal-actions .btn { padding: 12px; justify-content: center; }

.user-switch-row {
  display: flex; align-items: center; gap: 12px;
  width: 100%;
  padding: 10px 12px; margin-bottom: 6px;
  border: 1px solid var(--paper-line); border-radius: 8px;
  background: var(--paper); cursor: pointer; text-align: left;
  font-family: var(--sans);
}
.user-switch-row:hover { border-color: var(--ink-faint); background: var(--paper-2); }

/* ============================================================
   QUIZ EXP TAB LOCKED
   ============================================================ */
.exp-tab.locked { opacity: 0.65; }
.exp-tab.locked:hover { opacity: 0.85; }

/* ============================================================
   FEATURE PAGES (mock / weak / stats)
   ============================================================ */
.feature-shell {
  max-width: 1000px; margin: 0 auto;
  padding: 30px 28px 80px;
}
.feature-back {
  background: none; border: none;
  color: var(--ink-soft); font-size: 13px;
  cursor: pointer; margin-bottom: 16px; padding: 0;
  font-family: var(--sans);
}
.feature-back:hover { color: var(--ink); }
.feature-title {
  font-family: var(--serif); font-weight: 800; font-size: 28px;
  margin: 0 0 6px;
}
.feature-sub {
  color: var(--ink-soft); font-size: 14px; margin: 0 0 24px;
}


/* ============================================================
   MOCK EXAM
   ============================================================ */
.mock-exam { min-height: 100vh; background: var(--paper); }
.mock-bar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 24px;
  background: var(--ink); color: var(--paper);
  border-bottom: 2px solid var(--ink-2);
}
.mock-bar-left, .mock-bar-right { display: flex; align-items: center; gap: 12px; }
.mock-bar .btn { color: var(--paper); border-color: rgba(246,241,231,0.25); background: rgba(246,241,231,0.08); }
.mock-bar .btn:hover:not(:disabled) { background: rgba(246,241,231,0.16); border-color: rgba(246,241,231,0.4); color: var(--paper); }
.mock-tag {
  background: var(--accent); color: var(--paper);
  padding: 4px 10px; border-radius: 4px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.05em;
}
.mock-timer {
  font-family: var(--mono); font-weight: 700;
  font-size: 22px; letter-spacing: 0.05em;
  background: var(--paper); color: var(--ink);
  padding: 6px 16px; border-radius: 6px;
}
.mock-timer.warning { background: var(--accent); color: var(--paper); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: 0.7; } }
.mock-grid {
  display: grid; grid-template-columns: 1fr 280px; gap: 24px;
  max-width: 1200px; margin: 0 auto;
  padding: 24px;
}
@media (max-width: 880px) { .mock-grid { grid-template-columns: 1fr; } }
.mock-q-area .q-card {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px; padding: 24px 26px;
}
.mock-side {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px; padding: 18px; height: fit-content;
  position: sticky; top: 84px;
}
.mock-side h4 {
  font-family: var(--serif); font-weight: 700;
  font-size: 14px; margin: 0 0 12px;
}
.mock-grid-nav {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px;
  margin-bottom: 14px;
}
.mock-num {
  aspect-ratio: 1; padding: 0;
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  background: var(--paper-2); border: 1px solid var(--paper-line);
  border-radius: 4px; cursor: pointer;
  color: var(--ink-soft);
}
.mock-num.answered { background: var(--green); color: var(--paper); border-color: var(--green); }
.mock-num.current { box-shadow: 0 0 0 2px var(--accent); border-color: var(--accent); }
.mock-stats {
  font-size: 12px; color: var(--ink-soft);
  padding: 10px 0;
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  margin-bottom: 12px;
}
.toolbar-spacer { flex: 1; }

/* ============================================================
   WEAK ANALYSIS PAGE
   ============================================================ */
.weak-page, .stats-page {
  max-width: 980px; margin: 0 auto;
  padding: 30px 28px 80px;
}
.page-head {
  margin-bottom: 28px;
  display: flex; flex-direction: column; gap: 4px;
}
.page-head .btn { align-self: flex-start; margin-bottom: 6px; }
.page-head h1 {
  font-family: var(--serif); font-weight: 800;
  font-size: 28px; margin: 0;
}
.page-sub { color: var(--ink-soft); font-size: 14px; margin: 0; }
.weak-section {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 18px;
}
.weak-section.critical {
  border-color: var(--accent); background: linear-gradient(180deg, var(--accent-bg), var(--card-bg) 40%);
}
.weak-section.muted-section { opacity: 0.85; }
.weak-section h3 {
  font-family: var(--serif); font-weight: 700;
  font-size: 17px; margin: 0 0 14px;
}
.weak-list { display: flex; flex-direction: column; gap: 8px; }
.weak-row {
  display: grid;
  grid-template-columns: 1.2fr 1.6fr auto;
  gap: 16px; align-items: center;
  padding: 12px 14px;
  background: var(--paper); border: 1px solid var(--paper-line);
  border-radius: 8px;
}
@media (max-width: 720px) {
  .weak-row { grid-template-columns: 1fr; }
}
.weak-cat-name { font-weight: 700; color: var(--ink); font-size: 14px; }
.weak-cat-detail { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); margin-top: 2px; }
.weak-rate { display: flex; align-items: center; gap: 10px; }
.weak-rate-bar {
  flex: 1; height: 8px;
  background: var(--paper-2); border-radius: 999px; overflow: hidden;
}
.weak-rate-fill { height: 100%; transition: width 0.4s ease; }
.weak-rate-num { font-family: var(--mono); font-weight: 700; font-size: 13px; min-width: 36px; text-align: right; }
.weak-empty { color: var(--ink-soft); font-size: 13px; padding: 10px 0; }

/* ============================================================
   STATS DASHBOARD
   ============================================================ */
.stats-overview {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 12px; margin-bottom: 22px;
}
@media (max-width: 720px) { .stats-overview { grid-template-columns: repeat(2, 1fr); } }
.stat-card-big {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 10px; padding: 16px 18px;
}
.stat-card-num {
  font-family: var(--serif); font-weight: 900;
  font-size: 32px; color: var(--ink); line-height: 1.1;
}
.stat-card-label {
  font-size: 12px; color: var(--ink-soft); margin-top: 4px; letter-spacing: 0.05em;
}
.stats-section {
  background: var(--card-bg); border: 1px solid var(--paper-line);
  border-radius: 12px; padding: 22px 24px; margin-bottom: 18px;
}
.stats-section h3 {
  font-family: var(--serif); font-weight: 700; font-size: 16px;
  margin: 0 0 16px;
}

/* Recent sessions chart */
.recent-chart {
  display: flex; align-items: flex-end; gap: 10px;
  height: 180px;
  padding: 10px 4px 0;
  border-bottom: 1px solid var(--paper-line);
}
.recent-bar-wrap {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px;
  height: 100%;
}
.recent-bar {
  width: 100%; max-width: 40px;
  background: var(--accent); border-radius: 4px 4px 0 0;
  position: relative;
  transition: height 0.4s ease;
}
.recent-bar-num {
  position: absolute; top: -20px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 11px; font-weight: 700; color: var(--ink);
}
.recent-bar-label {
  font-family: var(--mono); font-size: 10px; color: var(--ink-soft);
}

/* Category bars */
.cat-bars { display: flex; flex-direction: column; gap: 8px; }
.cat-bar-row {
  display: grid; grid-template-columns: 130px 1fr 60px;
  align-items: center; gap: 12px;
}
.cat-bar-label {
  font-size: 13px; color: var(--ink-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.cat-bar-track {
  height: 24px; background: var(--paper-2);
  border-radius: 4px; overflow: hidden;
  position: relative;
}
.cat-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--gold) 80%, var(--accent));
  display: flex; align-items: center; justify-content: flex-end;
  padding-right: 8px;
  min-width: 30px;
  transition: width 0.4s ease;
}
.cat-bar-num { font-family: var(--mono); font-size: 11px; font-weight: 700; color: var(--paper); }
.cat-bar-count { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); text-align: right; }

/* ============================================================
   ACCOUNT (additions)
   ============================================================ */
.account-head { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; flex-wrap: wrap; }
.account-head .btn { flex-shrink: 0; }
.account-head h1 {
  font-family: var(--serif); font-weight: 800; font-size: 26px; margin: 0;
}
.account-section.danger-zone { border-color: var(--accent); }
.account-section.danger-zone h3 { color: var(--accent); }

/* ============================================================
   UPGRADE MODAL (additions for actual class names)
   ============================================================ */
.modal-close {
  position: absolute; top: 12px; right: 12px;
  background: none; border: none;
  width: 32px; height: 32px; border-radius: 50%;
  font-size: 16px; color: var(--ink-soft);
  cursor: pointer;
}
.modal-close:hover { background: var(--paper-2); color: var(--ink); }
.upgrade-modal {
  position: relative;
  padding: 36px 28px 24px;
  text-align: center;
}
.upgrade-icon { font-size: 44px; margin-bottom: 10px; }
.upgrade-title {
  font-family: var(--serif); font-weight: 800; font-size: 22px;
  margin: 4px 0 14px;
}
.upgrade-meter-row {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
}
.upgrade-meter {
  flex: 1; height: 8px;
  background: var(--paper-2); border-radius: 999px; overflow: hidden;
}
.upgrade-meter-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--gold), var(--accent));
}
.upgrade-meter-num {
  font-family: var(--mono); font-weight: 700; font-size: 13px;
  color: var(--accent);
}
.upgrade-desc {
  font-size: 13.5px; color: var(--ink-2);
  margin: 0 0 18px; line-height: 1.7;
}
.upgrade-features {
  list-style: none; padding: 0;
  margin: 0 0 18px;
  text-align: left;
  background: var(--paper-2);
  border-radius: 8px; padding: 14px 18px;
}
.upgrade-features li {
  padding: 4px 0; font-size: 13px; color: var(--ink-2);
}
.upgrade-trust {
  font-size: 11px; color: var(--ink-faint); margin-top: 10px;
}

/* ============================================================
   modal-backdrop (centering for any modal-box variant)
   ============================================================ */
/* Already defined earlier; ensure it flex-centers if not already */