:root {
  --bg: #fafaf9; --bg-card: #fff; --text: #1a1a2e;
  --text-muted: #6b7280; --border: #e5e5e5;
  --accent: #4a6fa5; --accent-light: #e8eef6;
  --red: #e74c3c; --green: #27ae60; --orange: #f39c12;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }

/* Nav */
nav { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; background: var(--bg-card); border-bottom: 1px solid var(--border); }
.logo { font-size: 22px; font-family: 'Noto Sans JP', sans-serif; font-weight: 700; text-decoration: none; color: var(--text); }
.logo span { font-family: 'Inter', sans-serif; font-weight: 400; font-size: 14px; color: var(--text-muted); margin-left: 6px; }
.nav-links { display: flex; gap: 8px; }
.nav-links a { text-decoration: none; color: var(--text-muted); padding: 6px 12px; border-radius: 6px; font-size: 14px; font-weight: 500; }
.nav-links a.active, .nav-links a:hover { color: var(--accent); background: var(--accent-light); }
.badge { background: var(--red); color: #fff; font-size: 11px; padding: 1px 6px; border-radius: 10px; margin-left: 4px; }

/* Main */
main { max-width: 960px; margin: 0 auto; padding: 32px 24px; }
h1 { font-size: 24px; margin-bottom: 24px; }
h2 { font-size: 18px; margin-bottom: 12px; color: var(--text); }
section { margin-bottom: 32px; }

/* Stats grid */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.stat-card.accent { border-color: var(--accent); }
.stat-value { font-size: 36px; font-weight: 700; font-family: 'Noto Sans JP', sans-serif; }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.stat-action { display: inline-block; margin-top: 8px; font-size: 13px; color: var(--accent); text-decoration: none; }

/* Tags */
.tag { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 4px; margin: 2px; }
.tag-pos { background: #e8e8e8; color: #555; }
.tag-jlpt { background: var(--accent); color: #fff; font-weight: 600; }
.tag-book { background: #f0eaff; color: #6b4fa5; }
.tag-error { background: #fde8e8; color: var(--red); }
.tag-row { display: flex; flex-wrap: wrap; gap: 4px; }

/* Book list */
.book-list { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.book-row { display: flex; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.book-row:last-child { border-bottom: none; }
.book-title { font-family: 'Noto Sans JP', sans-serif; }
.book-count { color: var(--text-muted); font-size: 13px; }

/* Warning */
.warning-box { background: #fef3c7; border: 1px solid #f59e0b; border-radius: 8px; padding: 12px 16px; font-size: 14px; }
.warning-box a { color: #b45309; }

/* Filters */
.filters { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.filters input, .filters select { padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; background: var(--bg-card); }
.filters input[type="search"] { flex: 1; min-width: 200px; }
.filters button, .btn { padding: 8px 16px; background: var(--accent); color: #fff; border: none; border-radius: 6px; font-size: 14px; cursor: pointer; text-decoration: none; display: inline-block; }
.filters button:hover, .btn:hover { opacity: 0.9; }

/* Word list */
.word-list { display: flex; flex-direction: column; gap: 12px; }
.word-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.word-header { display: flex; align-items: baseline; gap: 8px; margin-bottom: 4px; }
.word-main { font-size: 22px; font-family: 'Noto Sans JP', sans-serif; font-weight: 700; }
.word-reading { font-size: 14px; color: var(--text-muted); font-family: 'Noto Sans JP', sans-serif; }
.word-base { font-size: 13px; color: var(--text-muted); }
.word-pitch { margin: 4px 0; }
.word-meaning { margin: 8px 0; font-size: 15px; }
.word-context { font-family: 'Noto Sans JP', sans-serif; font-size: 14px; color: var(--text-muted); margin-bottom: 8px; padding: 8px; background: var(--bg); border-radius: 6px; }
.word-tags { display: flex; flex-wrap: wrap; gap: 4px; }

/* Pitch accent */
.pitch-diagram { display: inline-flex; align-items: flex-end; gap: 1px; font-family: 'Noto Sans JP', sans-serif; font-size: 18px; }
.pitch-diagram .mora { display: inline-block; padding: 4px 2px; border-top: 3px solid transparent; }
.pitch-diagram .mora.high { border-top-color: var(--red); }
.pitch-diagram .mora.drop { border-right: 3px solid var(--red); }
.pitch-diagram .pitch-type { font-size: 11px; color: var(--text-muted); margin-left: 6px; align-self: center; }

/* Review */
.review-count { color: var(--text-muted); margin-bottom: 20px; }
.review-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 32px; text-align: center; max-width: 600px; margin: 0 auto; }
.card-context { font-family: 'Noto Sans JP', sans-serif; font-size: 24px; line-height: 1.6; margin-bottom: 12px; }
.card-context mark { background: #ffe066; padding: 0 2px; border-radius: 2px; }
.card-book { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.btn-show { padding: 10px 28px; background: var(--accent); color: #fff; border: none; border-radius: 8px; font-size: 16px; cursor: pointer; }
.card-answer { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 20px; }
.card-word { font-family: 'Noto Sans JP', sans-serif; font-size: 32px; margin-bottom: 8px; }
.card-word rt { font-size: 0.5em; color: var(--text-muted); }
.card-pitch { margin: 8px 0; }
.card-meaning { font-size: 18px; margin: 12px 0; }
.card-tags { margin: 12px 0; }
.rating-buttons { display: flex; justify-content: center; gap: 12px; margin-top: 24px; }
.btn-rating { padding: 10px 20px; border: 2px solid var(--border); border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; background: var(--bg-card); min-width: 72px; }
.btn-rating.again { border-color: var(--red); color: var(--red); }
.btn-rating.hard { border-color: var(--orange); color: var(--orange); }
.btn-rating.good { border-color: var(--green); color: var(--green); }
.btn-rating.easy { border-color: var(--accent); color: var(--accent); }
.btn-rating:hover { opacity: 0.8; }
.done-msg { text-align: center; padding: 60px 20px; }
.done-icon { font-size: 48px; color: var(--green); margin-bottom: 16px; }
.done-msg h2 { color: var(--green); }
.done-msg p { color: var(--text-muted); margin-top: 8px; }

/* Settings */
.settings-grid { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; margin-bottom: 16px; }
.setting-row { display: flex; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.setting-row:last-child { border-bottom: none; }
.setting-label { font-weight: 500; }
.setting-value { color: var(--text-muted); }
.setting-value.ok { color: var(--green); }
.setting-value.warn { color: var(--orange); }
.api-info { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; font-size: 14px; line-height: 2; }
.api-info code { background: var(--bg); padding: 2px 6px; border-radius: 4px; font-size: 13px; }
.empty { color: var(--text-muted); text-align: center; padding: 40px; }

@media (max-width: 640px) {
  nav { flex-direction: column; gap: 8px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .rating-buttons { flex-wrap: wrap; }
  .filters { flex-direction: column; }
}