* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* hidden属性を確実に効かせる（display上書き対策） */
[hidden] { display: none !important; }

:root {
    --bg: #fdf8f0;
    --primary: #1b3a6b;
    --primary-dark: #102244;
    --accent: #c0392b;
    --success: #27ae60;
    --border-color: #3d2b1f;
    --cell-bg: #fffef8;
    --card-bg: #ffffff;
    --text: #1a1a1a;
    --text-muted: #888;
    --shadow-sm: 0 2px 8px rgba(0,0,0,.10);
    --shadow-md: 0 4px 16px rgba(0,0,0,.14);
    --shadow-lg: 0 8px 32px rgba(0,0,0,.18);
    --radius: 12px;
}

body {
    background: var(--bg);
    font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
                 "Meiryo", "Yu Gothic UI", sans-serif;
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.app {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 16px 48px;
}

/* ── Header ───────────────────────── */
.header {
    background: linear-gradient(135deg, #1b3a6b 0%, #2c5f8a 100%);
    color: white;
    margin: 0 -16px 28px;
    padding: 40px 32px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '志';
    position: absolute;
    font-size: 240px;
    font-weight: 900;
    color: rgba(255,255,255,.04);
    right: -20px;
    top: -50px;
    line-height: 1;
    pointer-events: none;
    user-select: none;
}

.header-inner {
    position: relative;
    z-index: 1;
}

.title {
    font-size: clamp(2rem, 6vw, 3.2rem);
    font-weight: 900;
    letter-spacing: .08em;
    margin-bottom: 12px;
    text-shadow: 0 2px 8px rgba(0,0,0,.25);
}

.subtitle {
    font-size: 1rem;
    opacity: .92;
    margin-bottom: 16px;
}

.target-word {
    font-size: 1.25em;
    font-weight: 900;
    color: #ffd54f;
    text-shadow: 0 1px 4px rgba(0,0,0,.3);
}

.rules {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.rule-item {
    background: rgba(255,255,255,.15);
    border-radius: 20px;
    padding: 4px 12px;
    font-size: .82rem;
    opacity: .95;
}

.rule-sep {
    opacity: .35;
    font-size: .8rem;
}

/* ── Settings ─────────────────────── */
.settings-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 20px 24px;
    margin-bottom: 24px;
}

.settings-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}

.size-selector {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 180px;
}

.settings-label {
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
    font-size: .95rem;
}

.select {
    flex: 1;
    padding: 9px 32px 9px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: .95rem;
    font-family: inherit;
    background: white;
    color: var(--text);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23666'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    transition: border-color .2s;
}

.select:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ── Buttons ──────────────────────── */
.btn {
    padding: 9px 18px;
    border: none;
    border-radius: 8px;
    font-size: .95rem;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: all .18s ease;
    white-space: nowrap;
    letter-spacing: .02em;
}

.btn:disabled {
    opacity: .35;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 6px rgba(27,58,107,.3);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(27,58,107,.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: #e8f0fb;
    color: var(--primary);
    border: 2px solid #c5d8f5;
}

.btn-secondary:hover:not(:disabled) {
    background: #d5e5fa;
    transform: translateY(-1px);
}

.btn-ghost {
    background: #f5f5f5;
    color: #555;
    border: 2px solid #e0e0e0;
}

.btn-ghost:hover:not(:disabled) {
    background: #ececec;
}

.btn-large {
    padding: 12px 36px;
    font-size: 1.05rem;
    border-radius: 10px;
}

.btn-x {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 12px 24px;
    background: #000;
    color: #fff;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: background .18s, transform .18s;
    letter-spacing: .02em;
}

.btn-x:hover {
    background: #222;
    transform: translateY(-1px);
}

/* ── Game Section ─────────────────── */
.game-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

/* ── Board ────────────────────────── */
.board-outer {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    display: flex;
    justify-content: center;
    padding: 4px;
}

.board-wrapper {
    position: relative;
    display: inline-flex;
}

.board {
    display: grid;
    gap: 1px;
    background: var(--border-color);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    user-select: none;
}

.cell {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--cell-bg);
    font-weight: 700;
    color: var(--text);
    cursor: pointer;
    position: relative;
}

/* 選択中（pending） */
.cell.pending {
    background: #e3f2fd;
    outline: 2.5px solid #1e88e5;
    outline-offset: -2px;
    z-index: 1;
}

/* 発見済み（JS側で --found-color をセット） */
.cell.found::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--found-color, #1e88e5);
    opacity: .25;
    pointer-events: none;
}

/* 見逃し（回答完了後にグレー表示） */
.cell.missed::before {
    content: '';
    position: absolute;
    inset: 0;
    background-color: #888;
    opacity: .18;
    pointer-events: none;
}

/* フラッシュアニメーション */
@keyframes flash-error {
    0%, 100% { background-color: var(--cell-bg); }
    30%, 70%  { background-color: #ffcdd2; }
}
@keyframes flash-duplicate {
    0%, 100% { background-color: var(--cell-bg); }
    30%, 70%  { background-color: #ffe0b2; }
}
.cell.flash-error     { animation: flash-error 0.5s ease; }
.cell.flash-duplicate { animation: flash-duplicate 0.5s ease; }

.svg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10;
    overflow: visible;
}

/* ── Answer Section ───────────────── */
.answer-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 24px 28px;
    width: 100%;
    max-width: 480px;
    text-align: center;
}

.answer-prompt {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.answer-hint {
    font-size: .85rem;
    color: #777;
    margin-bottom: 16px;
}

/* ゲーム HUD（発見数・タイマー） */
.game-hud {
    display: flex;
    justify-content: center;
    gap: 36px;
    margin-bottom: 16px;
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.hud-label {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.hud-value {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.hud-value--timer {
    color: var(--accent);
}

.answer-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.answer-input {
    width: 80px;
    padding: 10px 8px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1.4rem;
    font-family: inherit;
    font-weight: 700;
    text-align: center;
    color: var(--text);
    transition: border-color .2s, box-shadow .2s;
    -moz-appearance: textfield;
}

.answer-input::-webkit-outer-spin-button,
.answer-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.answer-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(27,58,107,.15);
}

.answer-input:disabled {
    background: #f5f5f5;
    color: #999;
}

.unit {
    font-size: 1.1rem;
    font-weight: 700;
    color: #555;
}

.error-msg {
    margin-top: 12px;
    color: var(--accent);
    font-size: .9rem;
    font-weight: 600;
    background: rgba(192,57,43,.08);
    border-radius: 6px;
    padding: 8px 12px;
    display: inline-block;
}

/* ── Result Section ───────────────── */
.result-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 28px 24px;
    width: 100%;
    max-width: 480px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    animation: fadeInUp .3s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* HUD スタイル（ゲームHUDテクニック参照） */
.result-stats {
    display: flex;
    justify-content: center;
    align-items: stretch;
    width: 100%;
    border: 1px solid #eee;
    border-radius: 10px;
    overflow: hidden;
}

.stat {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-divider {
    width: 1px;
    background: #eee;
}

.verdict {
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: .1em;
    line-height: 1.2;
}

.verdict.correct { color: var(--success); }
.verdict.wrong   { color: var(--accent); }

.result-message {
    font-size: .95rem;
    color: #555;
    line-height: 1.65;
    max-width: 360px;
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    align-items: center;
}

/* ── ランキング登録（結果画面内） ──── */
.ranking-register {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    text-align: center;
    width: 100%;
}

.ranking-register-title {
    font-size: .9rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.ranking-input-row {
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

.ranking-name-input {
    padding: 9px 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    width: 180px;
    transition: border-color .2s;
}

.ranking-name-input:focus {
    outline: none;
    border-color: var(--primary);
}

.ranking-name-input:disabled {
    background: #f5f5f5;
    color: #999;
}

.rank-result {
    margin-top: 12px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.6;
}

.rank-result.rank-top {
    color: #e65100;
    font-size: 1.1rem;
}

/* ── ランキングセクション（タブ切り替え） ── */
.ranking-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: 24px;
}

.ranking-section-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 24px;
    background: var(--primary);
    color: white;
}

.ranking-back-btn {
    color: white !important;
    border-color: rgba(255,255,255,.35) !important;
    background: rgba(255,255,255,.12) !important;
    flex-shrink: 0;
}

.ranking-back-btn:hover {
    background: rgba(255,255,255,.22) !important;
}

.ranking-section-title {
    font-size: 1.15rem;
    font-weight: 900;
    color: white;
}

.ranking-size-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 24px;
    border-bottom: 1px solid #f0f0f0;
    flex-wrap: wrap;
}

.ranking-size-row .select {
    flex: 1;
    min-width: 140px;
}

.ranking-table-area {
    padding: 16px 24px 24px;
}

.ranking-loading {
    text-align: center;
    color: #aaa;
    padding: 24px 0;
    font-size: .9rem;
}

.ranking-empty {
    text-align: center;
    color: #aaa;
    padding: 32px 0;
    font-size: .9rem;
}

.ranking-error {
    text-align: center;
    color: var(--accent);
    padding: 16px;
    font-size: .9rem;
    background: rgba(192,57,43,.06);
    border-radius: 8px;
}

.ranking-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .9rem;
}

.ranking-table th {
    text-align: left;
    padding: 8px 10px;
    border-bottom: 2px solid #eee;
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
}

.ranking-table td {
    padding: 10px 10px;
    border-bottom: 1px solid #f5f5f5;
    vertical-align: middle;
}

.ranking-table tr:last-child td {
    border-bottom: none;
}

.ranking-table tr.my-record td {
    background: rgba(27,58,107,.05);
    font-weight: 700;
}

.rank-num {
    font-weight: 800;
    color: var(--text-muted);
    font-size: .95rem;
    width: 36px;
    text-align: center;
}

.rank-num.rank-1 { color: #f9a825; font-size: 1.1rem; }
.rank-num.rank-2 { color: #9e9e9e; }
.rank-num.rank-3 { color: #a1887f; }

.rank-time {
    font-weight: 800;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.rank-date {
    color: #bbb;
    font-size: .82rem;
}

/* ── Footer ───────────────────────── */
.footer {
    text-align: center;
    padding: 32px 0 16px;
    color: #bbb;
    font-size: .78rem;
    border-top: 1px solid #e8e0d4;
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-logo-link {
    display: inline-block;
    opacity: .65;
    transition: opacity .2s;
}

.footer-logo-link:hover {
    opacity: 1;
}

.footer-logo {
    height: 26px;
    width: auto;
    display: block;
}

.footer-city-link {
    color: #999;
    font-size: .78rem;
    text-decoration: none;
    border-bottom: 1px dotted #ccc;
    transition: color .2s;
}

.footer-city-link:hover {
    color: var(--primary);
}

/* ── Responsive ───────────────────── */
@media (max-width: 480px) {
    .header {
        padding: 28px 20px;
        margin: 0 -16px 20px;
    }

    .settings-section {
        padding: 16px;
    }

    .settings-inner {
        flex-direction: column;
        align-items: stretch;
    }

    .size-selector {
        min-width: 0;
    }

    .btn-group {
        justify-content: center;
    }

    .answer-section,
    .result-section {
        padding: 20px 16px;
    }

    .stat-value {
        font-size: 1.5rem;
    }
}