:root {
    --bg-base: #f8fbff;
    --color-primary: #6366f1;
    --color-secondary: #8b5cf6;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --font-main: 'Inter', sans-serif;
    --radius-xl: 32px;
    --shadow-premium: 0 20px 50px rgba(99, 102, 241, 0.1);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

#app {
    max-width: 600px; /* PCでの広がりすぎを防止 */
    margin: 0 auto;
    padding: 80px 24px 160px;
}

.brand-title {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: -3px;
    margin-bottom: 20px;
    line-height: 1;
}

/* プレミアム・ステップ・カード */
.card-ui {
    background: #ffffff;
    border-radius: var(--radius-xl);
    padding: 48px 32px;
    margin-bottom: 32px;
    box-shadow: var(--shadow-premium);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* 弾むようなアニメーション */
}

.section-title {
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--color-primary);
    letter-spacing: 3px;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title::after {
    content: "";
    height: 1px;
    flex: 1;
    background: linear-gradient(to right, var(--color-primary), transparent);
    opacity: 0.2;
}

/* 選択肢: アイコン付きで楽しく */
.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.option-card {
    background: #f1f5f9;
    border-radius: 20px;
    padding: 24px 32px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 1.1rem;
    border: 2px solid transparent;
}

.option-card:hover {
    background: #e2e8f0;
    transform: translateX(5px);
}

.option-card.selected {
    background: #ffffff;
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.1);
}

.option-card.selected::after {
    content: "●"; /* 小さな光の点 */
    color: var(--color-primary);
    font-size: 0.6rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.3; }
    100% { opacity: 1; }
}

/* スライダー: 復活 & 強化 */
.slider-container {
    margin-bottom: 40px;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 12px;
    color: var(--text-muted);
}

.range-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 10px;
    outline: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    border: 6px solid #ffffff;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

/* アクションボタン: PCでの見え方を修正 */
.sticky-action {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 48px);
    max-width: 400px; /* PCでの幅を制限 */
    z-index: 1000;
}

.btn-primary {
    width: 100%;
    background: var(--color-primary);
    color: #ffffff;
    border: none;
    padding: 24px;
    border-radius: 24px;
    font-size: 1.2rem;
    font-weight: 900;
    cursor: pointer;
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
    transition: 0.4s;
}

.btn-primary:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 30px 60px rgba(99, 102, 241, 0.3);
}

/* 結果画面: プレミアムな一覧 */
.result-card {
    background: #ffffff;
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-premium);
    transition: 0.3s;
}

.product-name {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: 16px;
    line-height: 1.1;
}

.ethical-reason {
    font-size: 1rem;
    color: var(--text-muted);
    border-left: 4px solid var(--color-success);
    padding-left: 20px;
}