:root {
    --primary: #1c3450;
    --primary-dark: #10202f;
    --accent: #b83227;
    --accent-dark: #8f2419;
    --correct: #10b981;
    --correct-dark: #059669;
    --wrong: #ef4444;
    --wrong-dark: #dc2626;
    --bg: #f4f5f7;
    --ink: #1f2937;
    --ink-soft: #5c6b78;
    --card-line: #dde1e6;
}

* { box-sizing: border-box; }

html, body {
    background: var(--bg);
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    color: var(--ink);
}

.app-shell {
    max-width: 560px;
    margin: 0 auto;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
}

/* ---------- header ---------- */
.app-header {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 20;
}
.app-header h1 {
    font-size: 1.02rem;
    font-weight: bold;
    margin: 0;
    flex: 1;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    user-select: none;
}
.app-header h1:active { opacity: 0.8; }
.header-icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.18);
    color: #fff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    text-decoration: none;
    font-size: 0.95rem;
}
.header-icon-btn:hover { background: rgba(255,255,255,0.3); color: #fff; }
.header-spacer { background: transparent !important; pointer-events: none; }

#mainArea { flex: 1; padding: 20px 16px 8px; }

/* ---------- start screen ---------- */
.hero-copy { text-align: center; margin-bottom: 18px; }
.lead-sub { font-size: 1.1rem; font-weight: bold; margin-bottom: 6px; }
.lead-sub strong { color: var(--primary); }
.lead-desc { font-size: 0.85rem; color: var(--ink-soft); margin: 0; }

.stat-mini-row { display: flex; gap: 8px; margin-bottom: 18px; }
.stat-mini {
    flex: 1;
    background: #fff;
    border: 1px solid var(--card-line);
    border-radius: 14px;
    padding: 10px 6px;
    text-align: center;
}
.stat-mini-value { display: block; font-size: 1.3rem; font-weight: 800; color: var(--primary); line-height: 1.2; }
.stat-mini-label { font-size: 0.68rem; color: var(--ink-soft); }

.option-card {
    background: #fff;
    border: 1px solid var(--card-line);
    border-radius: 18px;
    padding: 18px;
    margin-bottom: 20px;
}
.option-title { font-size: 0.9rem; font-weight: 700; margin: 0 0 10px; color: var(--ink); }
.option-card .option-title:not(:first-child) { margin-top: 18px; }

.chip-group { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
    flex: 1;
    min-width: 84px;
    padding: 10px 8px;
    border-radius: 999px;
    border: 1.5px solid var(--card-line);
    background: #fff;
    color: var(--ink-soft);
    font-weight: 700;
    font-size: 0.82rem;
    transition: all .15s;
}
.chip.active { background: linear-gradient(135deg, var(--primary), var(--accent)); border-color: transparent; color: #fff; }
.mode-desc { font-size: 0.74rem; color: var(--ink-soft); margin: 8px 2px 0; line-height: 1.5; min-height: 1.1em; }

.opt-toggle {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--card-line);
}
.opt-toggle-label { font-size: 0.86rem; font-weight: 700; color: var(--ink); display: flex; flex-direction: column; }
.opt-toggle-sub { font-size: 0.7rem; font-weight: 500; color: var(--ink-soft); margin-top: 3px; }

.switch { position: relative; display: inline-block; width: 48px; height: 28px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider { position: absolute; inset: 0; cursor: pointer; background: #d3dbe2; border-radius: 999px; transition: .2s; }
.switch-slider::before {
    content: ''; position: absolute; height: 22px; width: 22px; left: 3px; top: 3px;
    background: #fff; border-radius: 50%; transition: .2s; box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.switch input:checked + .switch-slider { background: linear-gradient(135deg, var(--primary), var(--accent)); }
.switch input:checked + .switch-slider::before { transform: translateX(20px); }

.btn-start {
    display: block; width: 100%; padding: 16px; border: none; border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
    font-size: 1.1rem; font-weight: 800; box-shadow: 0 8px 20px rgba(28, 52, 80, 0.28);
}
.btn-start:active { transform: scale(0.98); }

.storage-note { font-size: 0.72rem; color: var(--ink-soft); text-align: center; margin: 14px 4px 0; line-height: 1.5; }

/* ---------- quiz screen ---------- */
.quiz-topbar { margin-bottom: 16px; }
.quiz-progress { height: 8px; border-radius: 999px; background: #dde1e6; }
.quiz-progress .progress-bar { background: linear-gradient(135deg, var(--primary), var(--accent)); transition: width .3s ease; }
.quiz-topbar-nums {
    display: flex; align-items: center; justify-content: space-between; margin-top: 8px;
    font-size: 0.85rem; color: var(--ink-soft); font-weight: 700;
}
.score-badge { color: var(--primary); }
.combo-badge { background: #fff1e0; color: #c2410c; padding: 2px 10px; border-radius: 999px; font-size: 0.8rem; }

.quiz-card {
    position: relative;
    background: #fff;
    border-radius: 22px;
    box-shadow: 0 6px 24px rgba(28, 52, 80, 0.12);
    padding: 20px 18px 22px;
    margin-bottom: 16px;
}
.quiz-format-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--primary);
    background: #eef2f7;
    border-radius: 999px;
    padding: 3px 12px;
    margin-bottom: 10px;
}
.quiz-lead { font-size: 0.9rem; line-height: 1.65; color: var(--ink); margin-bottom: 14px; }

/* ---------- タイマー(資料読み取り、弱め) ---------- */
.timer-bar-wrap { margin-bottom: 14px; }
.timer-bar-track { height: 5px; border-radius: 999px; background: #e7eaee; overflow: hidden; }
.timer-bar-fill { height: 100%; width: 100%; background: linear-gradient(135deg, var(--primary), var(--accent)); transition: width 1s linear; }
.timer-note { font-size: 0.72rem; color: var(--ink-soft); text-align: center; margin-top: 6px; }

/* ---------- 資料表示(table/bar/pie/law) ---------- */
.resource-display { margin-bottom: 16px; }
.res-title { font-size: 0.85rem; font-weight: 800; color: var(--ink); margin-bottom: 8px; }
.res-table-wrap { overflow-x: auto; border: 1px solid var(--card-line); border-radius: 12px; }
.res-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; white-space: nowrap; }
.res-table th, .res-table td { padding: 8px 12px; text-align: right; border-bottom: 1px solid var(--card-line); }
.res-table th:first-child, .res-table td:first-child { text-align: left; }
.res-table th { background: #eef2f7; color: var(--primary); font-weight: 800; }
.res-table tr:last-child td { border-bottom: none; }
.res-source { font-size: 0.68rem; color: var(--ink-soft); margin-top: 6px; text-align: right; }

.res-bar-list { display: flex; flex-direction: column; gap: 8px; }
.res-bar-row { display: flex; align-items: center; gap: 8px; }
.res-bar-cat { flex: 0 0 30%; font-size: 0.78rem; font-weight: 700; color: var(--ink); text-align: right; }
.res-bar-track { flex: 1; height: 20px; background: #eef2f7; border-radius: 6px; overflow: hidden; }
.res-bar-fill { height: 100%; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 6px; }
.res-bar-val { flex: 0 0 44px; font-size: 0.78rem; font-weight: 800; color: var(--primary); }

.res-pie-wrap { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; justify-content: center; }
.res-pie-chart { width: 130px; height: 130px; border-radius: 50%; flex-shrink: 0; }
.res-pie-legend { display: flex; flex-direction: column; gap: 6px; font-size: 0.78rem; }
.res-pie-legend-item { display: flex; align-items: center; gap: 6px; }
.res-pie-swatch { width: 12px; height: 12px; border-radius: 3px; flex-shrink: 0; }

.res-law-box {
    background: #f7f4ef;
    border-left: 3px solid var(--accent);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--ink);
}
.res-law-box .res-law-title { font-weight: 800; color: var(--accent-dark); margin-bottom: 6px; font-size: 0.8rem; }

/* ---------- 選択肢(単一選択 / 資料読み取り・4択) ---------- */
.choice-list { display: flex; flex-direction: column; gap: 10px; }
.choice-btn {
    width: 100%; padding: 13px 16px; border: 1.5px solid var(--card-line); border-radius: 14px;
    background: #fff; color: var(--ink); font-weight: 700; font-size: 0.9rem; text-align: left;
}
.choice-btn:active { transform: scale(0.99); }
.choice-btn:not(:disabled):hover { border-color: var(--primary); background: #f7f9fb; }
.choice-btn.choice-correct { border-color: var(--correct); background: #e9fbf4; color: var(--correct-dark); }
.choice-btn.choice-wrong { border-color: var(--wrong); background: #fdeceb; color: var(--wrong-dark); }

/* ---------- 正誤組み合わせ型 ---------- */
.seigo-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px; }
.seigo-item { border: 1.5px solid var(--card-line); border-radius: 14px; padding: 12px 14px; }
.seigo-item-text { font-size: 0.86rem; line-height: 1.55; margin-bottom: 10px; }
.seigo-item-text .seigo-key { font-weight: 800; color: var(--primary); margin-right: 4px; }
.seigo-toggle-row { display: flex; gap: 8px; }
.seigo-toggle-btn {
    flex: 1; padding: 9px; border-radius: 10px; border: 1.5px solid var(--card-line);
    background: #fff; color: var(--ink-soft); font-weight: 800; font-size: 0.85rem;
}
.seigo-toggle-btn.active-o { background: #e9fbf4; border-color: var(--correct); color: var(--correct-dark); }
.seigo-toggle-btn.active-x { background: #fdeceb; border-color: var(--wrong); color: var(--wrong-dark); }
.seigo-item.graded { opacity: 1; }
.seigo-item.graded .seigo-toggle-btn { pointer-events: none; }
.seigo-item.item-correct { border-color: var(--correct); }
.seigo-item.item-wrong { border-color: var(--wrong); }

/* ---------- 会話文空欄補充型 ---------- */
.dialogue-display { margin-bottom: 12px; }
.dialogue-line { display: flex; gap: 8px; margin-bottom: 10px; align-items: flex-start; }
.dialogue-speaker {
    flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%; background: #eef2f7; color: var(--primary);
    font-weight: 800; font-size: 0.78rem; display: flex; align-items: center; justify-content: center; margin-top: 2px;
}
.dialogue-text { font-size: 0.88rem; line-height: 1.7; color: var(--ink); flex: 1; }
.blank-slot {
    display: inline-block; min-width: 3.2em; padding: 1px 8px; margin: 0 2px; border-radius: 8px;
    border: 1.5px dashed var(--accent); background: #fdf4f2; color: var(--accent-dark); font-weight: 800;
    text-align: center; cursor: pointer;
}
.blank-slot.filled { border-style: solid; background: #eef2f7; color: var(--primary); border-color: var(--primary); }
.blank-slot.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.blank-slot.correct { border-color: var(--correct); background: #e9fbf4; color: var(--correct-dark); }
.blank-slot.wrong { border-color: var(--wrong); background: #fdeceb; color: var(--wrong-dark); }

.blank-panel { background: #f7f9fb; border-radius: 14px; padding: 12px 14px; margin-bottom: 14px; animation: fadeIn .2s ease; }
.blank-panel-title { font-size: 0.78rem; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.blank-panel-choices { display: flex; flex-direction: column; gap: 8px; }
.blank-choice-btn {
    width: 100%; padding: 10px 14px; border: 1.5px solid var(--card-line); border-radius: 10px;
    background: #fff; color: var(--ink); font-weight: 700; font-size: 0.86rem; text-align: left;
}
.blank-choice-btn:active { transform: scale(0.99); }

/* ---------- 分類・複数選択型 ---------- */
.bunrui-prompt { font-size: 0.88rem; font-weight: 700; color: var(--ink); margin-bottom: 12px; line-height: 1.6; }
.bunrui-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.bunrui-option {
    display: flex; align-items: center; gap: 10px; padding: 12px 14px;
    border: 1.5px solid var(--card-line); border-radius: 12px; background: #fff; font-size: 0.86rem;
}
.bunrui-option input[type="checkbox"] { width: 20px; height: 20px; flex-shrink: 0; accent-color: var(--primary); }
.bunrui-option.opt-correct { border-color: var(--correct); background: #e9fbf4; }
.bunrui-option.opt-wrong { border-color: var(--wrong); background: #fdeceb; }

/* ---------- 4択一問一答 ---------- */
.tango-question { font-size: 0.92rem; font-weight: 700; color: var(--ink); margin-bottom: 14px; line-height: 1.65; }

/* ---------- 解答するボタン ---------- */
.btn-submit {
    display: block; width: 100%; padding: 13px; border: none; border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-weight: 800; font-size: 0.95rem;
}
.btn-submit:disabled { opacity: 0.4; }

/* ---------- 解説ブロック(常時展開・主役) ---------- */
.explanation-block { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--card-line); animation: fadeIn .25s ease; }
.explanation-header { font-size: 0.95rem; font-weight: 800; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.explanation-header.is-correct { color: var(--correct-dark); }
.explanation-header.is-wrong { color: var(--wrong-dark); }
.explanation-body { display: flex; flex-direction: column; gap: 8px; }
.expl-row {
    border-radius: 12px; padding: 10px 12px; font-size: 0.82rem; line-height: 1.6;
    border: 1.5px solid var(--card-line); background: #fafbfc;
}
.expl-row.row-correct { border-color: var(--correct); background: #f0fbf6; }
.expl-row.row-wrong { border-color: var(--wrong); background: #fdf2f1; }
.expl-row.row-selected { box-shadow: 0 0 0 2px rgba(28, 52, 80, 0.25) inset; }
.expl-row-head { font-weight: 800; margin-bottom: 4px; display: flex; align-items: center; gap: 6px; }
.expl-row-head .expl-mark { flex-shrink: 0; }
.expl-row.row-correct .expl-mark { color: var(--correct-dark); }
.expl-row.row-wrong .expl-mark { color: var(--wrong-dark); }
.expl-row-text { color: var(--ink); }
.expl-row-reason { color: var(--ink-soft); margin-top: 4px; }
.expl-selected-tag { font-size: 0.68rem; font-weight: 800; color: var(--primary); background: #eef2f7; border-radius: 999px; padding: 1px 8px; margin-left: 4px; }

.btn-next {
    display: block; width: 100%; padding: 14px; border: none; border-radius: 16px;
    background: var(--ink); color: #fff; font-weight: 800; font-size: 1rem;
}

/* ---------- result screen ---------- */
.result-card { background: #fff; border-radius: 22px; box-shadow: 0 6px 24px rgba(28, 52, 80, 0.12); padding: 30px 20px; text-align: center; margin-bottom: 20px; }
.result-rank {
    width: 84px; height: 84px; line-height: 84px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
    font-size: 2.4rem; font-weight: 900; margin: 0 auto 12px;
}
.result-new-best { display: inline-block; background: #fff7e0; color: #b45309; font-weight: 700; font-size: 0.8rem; padding: 4px 14px; border-radius: 999px; margin-bottom: 10px; }
.result-score { font-size: 2.6rem; font-weight: 900; color: var(--ink); }
.result-score-unit { font-size: 1.1rem; font-weight: 700; color: var(--ink-soft); margin-left: 4px; }
.result-stats-row { display: flex; margin-top: 20px; border-top: 1px solid var(--card-line); padding-top: 18px; }
.result-stat { flex: 1; }
.result-stat-value { display: block; font-size: 1.25rem; font-weight: 800; color: var(--primary); }
.result-stat-label { font-size: 0.72rem; color: var(--ink-soft); }

.result-unit-breakdown { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--card-line); text-align: left; }
.result-unit-title { font-size: 0.8rem; font-weight: 800; color: var(--ink-soft); margin-bottom: 10px; }
.result-unit-list { display: flex; flex-direction: column; gap: 8px; }

.btn-secondary-wide {
    display: block; width: 100%; padding: 13px; margin-top: 10px;
    border: 1.5px solid var(--card-line); border-radius: 14px; background: #fff; color: var(--ink-soft); font-weight: 700;
}

/* ---------- footer ---------- */
.app-footer { text-align: center; font-size: 0.72rem; color: var(--ink-soft); padding: 22px 16px 28px; }
.app-footer a { color: var(--primary); text-decoration: none; }

/* ---------- メニュー（左ドロワー） ---------- */
.menu-overlay { position: fixed; inset: 0; background: rgba(16, 32, 47, 0.5); z-index: 60; display: flex; justify-content: flex-start; }
.menu-drawer {
    width: 80%; max-width: 320px; background: #fff; height: 100%;
    display: flex; flex-direction: column; padding: 8px 0;
    box-shadow: 4px 0 24px rgba(0,0,0,.15); animation: drawerIn .2s ease;
}
@keyframes drawerIn { from { transform: translateX(-30px); opacity: .6; } to { transform: translateX(0); opacity: 1; } }
.menu-drawer-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px; border-bottom: 1px solid var(--card-line); font-weight: 800; color: var(--primary);
}
.menu-drawer-head .header-icon-btn { background: #eef2f7; color: var(--ink); }
.menu-item {
    display: flex; align-items: center; gap: 14px; width: 100%;
    padding: 16px 20px; border: none; background: #fff; text-align: left;
    font-size: 0.98rem; font-weight: 700; color: var(--ink); text-decoration: none;
    border-bottom: 1px solid #f1f2f4;
}
.menu-item:active { background: #f7f8fa; }
.menu-ico { width: 22px; text-align: center; color: var(--primary); }

/* ---------- モーダル共通 ---------- */
.modal-overlay { position: fixed; inset: 0; background: rgba(16, 32, 47, 0.55); display: flex; align-items: flex-end; justify-content: center; z-index: 50; }
.modal-box { background: var(--bg); width: 100%; max-width: 560px; max-height: 88vh; border-radius: 22px 22px 0 0; display: flex; flex-direction: column; animation: slideUp .22s ease; }
@keyframes slideUp { from { transform: translateY(30px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.modal-header-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid var(--card-line); flex-shrink: 0; }
.modal-header-row h2 { font-size: 1.05rem; font-weight: 800; margin: 0; }
.modal-header-row .header-icon-btn { background: #eef2f7; color: var(--ink); }
.modal-body { padding: 16px 18px 26px; overflow-y: auto; }
.modal-subtitle { font-size: 0.9rem; font-weight: 800; margin: 20px 0 10px; }

.breakdown-list { display: flex; flex-direction: column; gap: 8px; }
.breakdown-item { background: #fff; border: 1px solid var(--card-line); border-radius: 12px; padding: 10px 12px; }
.breakdown-item-row { display: flex; justify-content: space-between; font-size: 0.84rem; font-weight: 700; margin-bottom: 6px; }
.breakdown-bar-track { height: 8px; border-radius: 999px; background: #eef2f7; overflow: hidden; }
.breakdown-bar-fill { height: 100%; background: linear-gradient(135deg, var(--primary), var(--accent)); }

.weak-list, .session-list { display: flex; flex-direction: column; gap: 8px; }
.weak-item, .session-item {
    background: #fff; border: 1px solid var(--card-line); border-radius: 12px; padding: 10px 12px;
    display: flex; align-items: center; justify-content: space-between; font-size: 0.85rem;
}
.weak-item .w-text { font-weight: 700; font-size: 0.8rem; max-width: 72%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.weak-item .w-rate { color: var(--wrong-dark); font-weight: 800; font-size: 0.8rem; }
.session-item .s-date { color: var(--ink-soft); font-size: 0.78rem; }
.session-item .s-score { font-weight: 800; color: var(--primary); }
.empty-note { color: var(--ink-soft); font-size: 0.82rem; text-align: center; padding: 14px 0; }

.btn-reset {
    display: block; width: 100%; padding: 12px; margin-top: 22px; border: none; border-radius: 14px;
    background: #fef2f2; color: var(--wrong-dark); font-weight: 700; font-size: 0.88rem;
}

/* ---------- このアプリについて ---------- */
.about-body { font-size: 0.88rem; line-height: 1.7; color: var(--ink); }
.about-lead { text-align: center; margin-bottom: 18px; }
.about-appname { font-size: 1.15rem; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.about-lead p { font-size: 0.82rem; color: var(--ink-soft); margin: 0; text-align: left; }
.about-h { font-size: 0.9rem; font-weight: 800; color: var(--ink); margin: 20px 0 8px; padding-left: 10px; border-left: 3px solid var(--primary); }
.about-p { margin: 0 0 6px; font-size: 0.84rem; }
.about-p a, .about-lead a { color: var(--primary); font-weight: 700; text-decoration: none; }
.about-credit { margin: 4px 0 6px; padding-left: 4px; list-style: none; }
.about-credit li { font-size: 0.84rem; font-weight: 700; padding: 4px 0 4px 22px; position: relative; }
.about-credit li::before {
    content: '\f0a1'; font-family: 'Font Awesome 6 Free'; font-weight: 900;
    position: absolute; left: 0; color: var(--accent); font-size: 0.72rem; top: 6px;
}
.about-note { font-size: 0.76rem; color: var(--ink-soft); margin: 6px 0 0; }
.about-foot { text-align: center; font-size: 0.74rem; color: var(--ink-soft); margin-top: 22px; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.screen { animation: fadeIn .2s ease; }