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

    --bg-color: var(--meisei2);
    --card-bg: var(--white);
    --text-primary: var(--black);
    --text-secondary: var(--gray);
    --accent-color: var(--meisei);
    --border-color: var(--gray3);
    --success-color: #10b981;
    --active-row-bg: #fdf2f2;

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

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

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 32px 20px;
}

.container {
    width: 100%;
    max-width: 900px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
}

/* ── Header ──────────────────────────── */
header {
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    transition: all 0.25s ease;
}

.back-link:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

h1 {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: 0.02em;
}

/* ── Controls Bar ────────────────────── */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--gray4);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.voice-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

#voice-select {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-family: inherit;
    font-weight: 600;
    max-width: 200px;
    outline: none;
    transition: all 0.2s;
}

#voice-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(127, 48, 51, 0.1);
}

.speed-controls {
    display: flex;
    align-items: center;
    gap: 6px;
}

.label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-right: 4px;
}

/* ── Buttons ──────────────────────────── */
button {
    cursor: pointer;
    border: none;
    border-radius: 9999px;
    padding: 8px 18px;
    font-weight: 600;
    font-family: inherit;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-speed {
    background: var(--white);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
}

.btn-speed.active {
    background: var(--accent-color);
    color: var(--white);
    border-color: var(--accent-color);
}

.btn-speed:hover:not(.active) {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.global-actions {
    display: flex;
    gap: 8px;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--white);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(127, 48, 51, 0.2);
}

.btn-primary:disabled,
.btn-secondary:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--white);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* ── File Upload ─────────────────────── */
.file-input-wrapper {
    margin-bottom: 24px;
    display: flex;
    justify-content: flex-start;
}

input[type="file"] {
    display: none;
}

.custom-file-upload {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    cursor: pointer;
    background: var(--white);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.25s ease;
}

.custom-file-upload:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* ── Content List ────────────────────── */
.content-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 520px;
    overflow-y: auto;
    padding-right: 4px;
}

.content-list::-webkit-scrollbar { width: 6px; }
.content-list::-webkit-scrollbar-track { background: transparent; }
.content-list::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 10px; }

.row-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: var(--gray4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all 0.25s ease;
    cursor: pointer;
    gap: 12px;
}

.row-item:hover {
    background: var(--meisei3);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.row-item.playing {
    background: var(--active-row-bg);
    border-color: var(--accent-color);
    border-left: 3px solid var(--accent-color);
}

.row-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.row-text {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.row-translation {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
    transition: all 0.2s;
}

.row-translation.hidden {
    display: none;
}

.row-actions {
    flex-shrink: 0;
    display: flex;
    gap: 6px;
}

.btn-play-small {
    background: var(--meisei3);
    color: var(--accent-color);
    padding: 6px 14px;
    border-radius: 9999px;
    font-size: 0.82rem;
    border: 1px solid var(--border-color);
}

.btn-play-small:hover {
    background: var(--accent-color);
    color: var(--white);
    border-color: var(--accent-color);
}

.btn-translate-small {
    background: var(--white);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 9999px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

.btn-translate-small:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
    font-weight: 600;
}

/* ── Mobile ───────────────────────────── */
@media (max-width: 640px) {
    body { padding: 12px; }
    .container { padding: 20px; border-radius: 24px; }
    h1 { font-size: 1.8rem; }

    .controls-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 14px;
    }

    .voice-controls { flex-wrap: wrap; width: 100%; }

    #voice-select {
        max-width: 100%;
        width: 100%;
        min-width: 0;
        font-size: 0.8rem;
    }

    .speed-controls { width: 100%; flex-wrap: wrap; }
    .btn-speed { padding: 5px 12px; font-size: 0.78rem; }

    .global-actions { width: 100%; flex-wrap: wrap; }
    .global-actions .btn-primary,
    .global-actions .btn-secondary {
        flex: 1 1 0;
        min-width: 0;
        padding: 8px 6px;
        font-size: 0.78rem;
        justify-content: center;
    }

    .custom-file-upload { font-size: 0.88rem; padding: 9px 18px; }
    .content-list { max-height: 60vh; }
    .row-item { padding: 12px 14px; border-radius: 16px; }
    .row-text { font-size: 0.92rem; }
    .row-translation { font-size: 0.78rem; }
    .btn-play-small { padding: 5px 10px; font-size: 0.75rem; }
    .empty-state { padding: 32px 12px; font-size: 0.9rem; }
}

@media (max-width: 400px) {
    h1 { font-size: 1.5rem; }
    .controls-bar { padding: 10px; gap: 10px; }
    .label { font-size: 0.72rem; margin-right: 2px; }
    .btn-speed { padding: 4px 10px; font-size: 0.72rem; }
    .global-actions .btn-primary,
    .global-actions .btn-secondary { font-size: 0.72rem; padding: 7px 4px; }
    .row-item { padding: 10px 12px; }
    .row-text { font-size: 0.84rem; }
}