@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Noto+Sans+JP:wght@400;500;700&family=Outfit:wght@400;600;800&display=swap');

:root {
    --white: #ffffff;
    --black: #222222;
    --meisei: #7f3033;
    --meisei2: #f9f3f3;
    --meisei3: #faf5f5;
    --gray: #666666;
    --gray2: #aaaaaa;
    --gray3: #e2e2e2;
    --gray4: #fafafa;

    --bg: var(--meisei2);
    --panel-bg: var(--white);
    --text: var(--black);
    --text-gray: var(--gray);
    --primary: var(--meisei);
    --border: var(--gray3);
    --border-dark: #000000;

    --secondary: #6c5ce7;
    --accent: #f0c040;
    --success: #10b981;
    --danger: #f43f5e;

    --radius-lg: 32px;
    --radius-md: 20px;
    --radius-sm: 12px;
    --shadow: 0 4px 35px rgba(69, 27, 27, 0.08);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    padding: 24px 20px;
    line-height: 1.5;
    min-height: 100vh;
}

/* ── Header ──────────────────────────── */
.title-container {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

h1 {
    margin: 0;
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2.4rem, 7vw, 4rem);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: var(--primary);
    line-height: 1;
}

.subtitle {
    margin-top: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--text-gray);
    text-transform: uppercase;
    display: inline-block;
}

.nav-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background-color: var(--white);
    color: var(--text-gray);
    text-decoration: none;
    font-weight: 600;
    border: 1px solid var(--border);
    border-radius: 9999px;
    box-shadow: var(--shadow);
    transition: all 0.25s ease;
    font-size: 0.95rem;
}

.nav-link-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ── Container / Card ────────────────── */
.container {
    max-width: 800px;
    margin: 0 auto 30px;
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
}

p {
    margin: 0 0 10px;
    font-weight: 600;
    color: var(--text-gray);
    font-size: 0.95rem;
}

h3 {
    margin: 24px 0;
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--text);
    line-height: 1.6;
}

/* ── Form Elements ────────────────────── */
input[type="file"],
input[type="number"],
input[type="text"],
select {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--gray4);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    transition: all 0.2s ease;
    outline: none;
    color: var(--text);
}

input[type="file"],
input[type="number"],
input[type="text"]:not(.inline-input),
select {
    width: 100%;
}

input[type="text"]:focus,
select:focus {
    background: var(--white);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(127, 48, 51, 0.1);
}

input[type="file"]::file-selector-button {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    font-weight: 600;
    cursor: pointer;
    margin-right: 12px;
    transition: all 0.2s ease;
}

/* ── Checkbox grids ──────────────────── */
#format-checkboxes,
#unit-category-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 20px;
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

/* ── Badges ───────────────────────────── */
.badge {
    display: inline-block;
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 9999px;
    margin-right: 6px;
    margin-bottom: 10px;
}

.format-badge { background: var(--meisei3); color: var(--primary); border: 1px solid var(--border); }
.level-badge { background: #fffbe6; color: #92610a; border: 1px solid #f0d080; }
.unit-category-badge { background: #fce8f3; color: #7c2d52; border: 1px solid #f0a8d0; }
.item-id-badge { background: var(--gray4); color: var(--text-gray); border: 1px solid var(--border); }

/* ── Buttons ──────────────────────────── */
button {
    appearance: none;
    cursor: pointer;
    border: none;
    border-radius: 9999px;
    padding: 14px 32px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    background-color: var(--primary);
    color: white;
    margin-top: 12px;
    box-shadow: var(--shadow);
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(127, 48, 51, 0.2);
}

button:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
}

button.is-playing {
    background-color: var(--accent) !important;
    color: #222 !important;
    animation: pulse 1.5s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: translateY(-2px) scale(1); }
    50% { transform: translateY(-2px) scale(1.02); }
}

.secondary-btn {
    background-color: var(--white);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: none;
}

.secondary-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: none;
}

/* ── Quiz UI ─────────────────────────── */
#progress {
    font-weight: 600;
    color: var(--text-gray);
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    margin-bottom: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.option-label:hover {
    background-color: var(--meisei3);
    border-color: var(--primary);
}

.option-label:has(input[type="radio"]:checked) {
    background-color: var(--meisei3);
    border-color: var(--primary);
    color: var(--primary);
}

.option-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.inline-input {
    width: auto;
    min-width: 80px;
    display: inline-block;
    margin: 0 4px;
    padding: 6px 14px;
    text-align: center;
    border-radius: var(--radius-sm);
    vertical-align: middle;
    font-size: 1.1rem;
}

/* ── Result Messages ─────────────────── */
.result-message {
    margin-top: 20px;
}

.result-correct, .result-incorrect {
    font-size: 1.1rem;
    font-weight: 700;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 14px;
}

.result-correct { background-color: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }
.result-incorrect { background-color: #ffe4e6; color: #9f1239; border: 1px solid #fca5a5; }

.result-sentence {
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 18px;
    margin-top: 12px;
    font-size: 1rem;
    font-weight: 600;
}

.highlight-answer {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
}

.diff-err {
    color: var(--danger);
    text-decoration: underline wavy;
    font-weight: 700;
    background-color: #fff0f2;
    padding: 0 2px;
    border-radius: 4px;
}

.your-answer-label {
    color: var(--text-gray);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ── Explanation ─────────────────────── */
.explanation {
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    margin: 24px 0;
}

.play-audio-btn {
    padding: 8px 18px;
    font-size: 0.85rem;
    border-radius: 9999px;
    margin-right: 6px;
    margin-top: 6px;
    background-color: var(--white);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: none;
}

.play-audio-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ── Result Screen ───────────────────── */
.result-screen {
    text-align: center;
    padding: 10px;
}

.result-title {
    font-size: clamp(1.6rem, 5vw, 2.2rem);
    font-weight: 800;
    margin-bottom: 28px;
    color: var(--primary);
    font-family: 'Outfit', sans-serif;
}

.result-card {
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 24px;
}

.result-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-gray);
    margin-bottom: 6px;
}

.result-accuracy {
    font-size: clamp(2.8rem, 9vw, 4rem);
    font-weight: 800;
    color: var(--primary);
    margin: 8px 0;
    font-family: 'Outfit', sans-serif;
}

.result-detail {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-gray);
}

.rank-section {
    margin-bottom: 28px;
}

.rank-badge {
    display: inline-block;
    font-size: clamp(3.5rem, 10vw, 5rem);
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    color: #fff;
    border-radius: var(--radius-md);
    padding: 14px 40px;
    margin: 12px 0;
}

.rank-s { background-color: #c0392b; }
.rank-a { background-color: #2980b9; }
.rank-b { background-color: #16a085; }
.rank-c { background-color: #d35400; }
.rank-d { background-color: #8e44ad; }
.rank-e { background-color: #2c3e50; }

.rank-comment {
    font-size: clamp(1.1rem, 3.5vw, 1.5rem);
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.4;
}

.result-footer {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-gray);
    margin-bottom: 36px;
}

.start-over-btn {
    font-size: 1.2rem;
    padding: 18px 56px;
}

/* ── Indicators ──────────────────────── */
#loaded-file-indicator {
    background: var(--gray4);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    color: var(--success);
    font-weight: 600;
    font-size: 0.9rem;
}

#setup-error {
    background: #ffe4e6;
    color: #9f1239;
    padding: 10px 14px;
    border: 1px solid #fca5a5;
    border-radius: var(--radius-sm);
    margin-top: 10px;
    font-weight: 600;
    font-size: 0.9rem;
}

.option-box {
    width: fit-content;
    max-width: 100%;
}

/* ── Mobile ───────────────────────────── */
@media (max-width: 600px) {
    body { padding: 12px; overflow-x: hidden; }
    .container { padding: 20px; border-radius: 24px; }
    h1 { font-size: 2rem; }
    button { width: 100%; margin-bottom: 10px; }

    input[type="file"],
    input[type="number"],
    input[type="text"],
    select {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        font-size: 0.95rem;
    }

    .option-box { width: 100%; }

    .badge {
        font-size: 0.72rem;
        padding: 5px 10px;
        margin-right: 4px;
    }

    .play-audio-btn {
        width: auto;
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .option-label {
        padding: 12px 14px;
        font-size: 0.92rem;
    }

    .inline-input {
        min-width: 60px;
        font-size: 0.95rem;
        padding: 4px 10px;
    }

    .explanation { padding: 14px; margin: 16px 0; }
    .result-card { padding: 18px; }
    .start-over-btn { font-size: 1rem; padding: 14px 36px; }
}