:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --accent: #2f5597;
  --accent-fg: #ffffff;
  --border: #d8d8d8;
  --card: #f7f8fa;
  --correct: #1b8a3b;
  --wrong: #c0392b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #eaeaea;
    --muted: #9a9a9a;
    --accent: #6c93d6;
    --accent-fg: #0d1117;
    --border: #333640;
    --card: #1c1f26;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 1.3rem;
  margin: 0;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
}

.module-tabs {
  display: flex;
  gap: 8px;
}

.module-tab {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
}

.module-tab.active {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

.controls label {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
  color: var(--muted);
  gap: 4px;
}

select, button {
  font: inherit;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
}

button {
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
  cursor: pointer;
  font-weight: 600;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

.hint { color: var(--muted); }

.question {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

.progress {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.question .sentence {
  font-size: 1.25rem;
  margin: 0 0 14px;
  line-height: 2.4;
}

ruby rt {
  font-size: 0.6em;
  color: var(--muted);
  user-select: none;
}

#app.furigana-off ruby rt {
  visibility: hidden;
}

.next-btn {
  margin-top: 4px;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1.9;
}

.option:hover:not(:disabled) { border-color: var(--accent); }
.option.selected { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 15%, var(--bg)); }
.option.correct { border-color: var(--correct); color: var(--correct); font-weight: 600; }
.option.wrong { border-color: var(--wrong); color: var(--wrong); font-weight: 600; }

.input-row {
  display: flex;
  gap: 8px;
}

.input-row input {
  flex: 1;
  font: inherit;
  font-size: 1.05rem;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
}

.feedback {
  margin-top: 10px;
  font-size: 0.95rem;
}

.feedback.correct { color: var(--correct); }
.feedback.wrong { color: var(--wrong); }

.meaning {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.summary {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

/* --- login screen --- */

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-screen[hidden] {
  display: none;
}

.login-card {
  max-width: 360px;
  width: 100%;
  text-align: center;
}

.login-card h1 {
  margin: 0 0 8px;
}

.google-btn {
  display: block;
  margin: 20px 0;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  text-decoration: none;
  font-weight: 600;
}

.admin-login {
  text-align: left;
  color: var(--muted);
  font-size: 0.85rem;
}

.admin-login summary {
  cursor: pointer;
  margin-bottom: 10px;
}

.admin-login form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.admin-login input {
  font: inherit;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
}

.login-error {
  color: var(--wrong);
  font-size: 0.85rem;
  margin-top: 8px;
}

/* --- user box --- */

.user-box {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

#user-name {
  font-size: 0.85rem;
  color: var(--muted);
}

.danger-btn {
  background: var(--bg);
  color: var(--wrong);
  border: 1px solid var(--wrong);
}

/* --- progress summary bar --- */

.progress-summary-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  max-width: 720px;
  margin: 0 auto;
}

.progress-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--muted);
}

.progress-pill-label {
  font-weight: 600;
  color: var(--fg);
}

.progress-pill-bar {
  width: 60px;
  height: 6px;
  border-radius: 3px;
  background: var(--card);
  border: 1px solid var(--border);
  overflow: hidden;
  display: inline-block;
}

.progress-pill-fill {
  display: block;
  height: 100%;
  background: var(--accent);
}

/* --- overview list --- */

.overview-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.overview-item {
  display: grid;
  grid-template-columns: 14px 1fr 1fr 2fr;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 0.85rem;
}

.overview-reading {
  color: var(--muted);
}

.overview-meaning {
  color: var(--muted);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--muted);
  opacity: 0.5;
}

.overview-item.status-correct .status-dot { background: var(--correct); opacity: 1; }
.overview-item.status-wrong .status-dot { background: var(--wrong); opacity: 1; }