/* --- トップページのコンテナ --- */
#index-container {
    text-align: center;
    background: transparent;
    box-shadow: none;
    padding: var(--spacing-xl) var(--spacing-md);
}

body {
    background-color: #F8F9FA;
}

.index-title {
    margin-top: 0;
    font-size: var(--font-size-3xl);
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
}

.index-title-highlight {
    display: inline-block;
    padding: 4px 10px;
    margin-bottom: 6px;
    border-radius: var(--radius-full);
    background: rgba(37, 99, 235, 0.08);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.08em;
}

.index-lead {
    margin-bottom: var(--spacing-2xl);
    color: var(--color-text-sub);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

/* フォームカード */
.index-form-card {
    background: #FFFFFF;
    padding: var(--spacing-2xl);
    border-radius: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    text-align: left;
    max-width: 100%;
    margin: 0 auto;
}

#quick-diagnosis-form {
    background: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    text-align: left;
}

#quick-diagnosis-form .index-form-group {
    margin-bottom: var(--spacing-xl);
}

.index-question-label {
    font-weight: 600;
    display: block;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-main);
    font-size: var(--font-size-base);
}

/* セグメントコントロール（性別選択） */
.index-segment-control {
    display: inline-flex;
    background: #F3F4F6;
    border-radius: 16px;
    padding: 4px;
    gap: 0;
    width: 100%;
    max-width: 400px;
    position: relative;
}

.index-segment-option {
    flex: 1;
    cursor: pointer;
    position: relative;
    z-index: 1;
}

.index-segment-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.index-segment-text {
    display: block;
    padding: 14px 20px;
    text-align: center;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: #6B7280;
    border-radius: 12px;
    transition: all 0.2s ease;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.index-segment-option input[type="radio"]:checked + .index-segment-text {
    background: var(--color-primary);
    color: #FFFFFF;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.index-segment-option:hover .index-segment-text {
    color: var(--color-text-main);
}

.index-segment-option input[type="radio"]:checked:hover + .index-segment-text {
    color: #FFFFFF;
    background: var(--color-primary-dark);
}

/* モダンなSelect Box */
.index-select-wrapper {
    position: relative;
    width: 100%;
}

.index-select-modern {
    width: 100%;
    padding: 16px 48px 16px 20px;
    font-size: var(--font-size-base);
    border-radius: 16px;
    border: 2px solid var(--color-border);
    background-color: #FFFFFF;
    color: var(--color-text-main);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 44px;
    font-weight: 500;
}

.index-select-modern:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.index-select-modern:hover {
    border-color: var(--color-primary-light);
}

.index-select-arrow {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--color-text-sub);
    transition: transform 0.2s ease;
}

.index-select-wrapper:focus-within .index-select-arrow {
    transform: translateY(-50%) rotate(180deg);
}

/* 気分選択カード（グリッド） */
.index-mood-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.index-mood-card {
    position: relative;
    border: 2px solid var(--color-border);
    padding: var(--spacing-lg);
    border-radius: 20px;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s ease;
    background: #FFFFFF;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 140px;
}

.index-mood-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.index-mood-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
    transition: transform 0.3s ease;
}

.index-mood-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.index-mood-main {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--color-text-main);
    margin: 0;
}

.index-mood-sub {
    font-size: var(--font-size-xs);
    color: var(--color-text-sub);
    margin: 0;
}

.index-mood-card:hover {
    border-color: var(--color-primary-light);
    background-color: rgba(37, 99, 235, 0.02);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.index-mood-card:hover .index-mood-icon {
    transform: scale(1.1);
}

.index-mood-card input[type="radio"]:checked ~ .index-mood-icon,
.index-mood-card.is-active .index-mood-icon {
    transform: scale(1.15);
}

.index-mood-card input[type="radio"]:checked,
.index-mood-card.is-active {
    border-color: var(--color-primary);
    background-color: rgba(37, 99, 235, 0.06);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.index-mood-card input[type="radio"]:checked ~ .index-mood-content .index-mood-main,
.index-mood-card.is-active .index-mood-content .index-mood-main {
    color: var(--color-primary);
    font-weight: 700;
}

/* CTAボタン */
.index-submit-button {
    margin-top: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border: none;
    border-radius: 16px;
    padding: 18px 24px;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: #FFFFFF;
    width: 100%;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
    min-height: 56px;
    letter-spacing: 0.02em;
}

.index-submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, #1e3a8a 100%);
}

.index-submit-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.index-submit-button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* --- 計算フォーム (#pfc-form) --- */
#pfc-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px 20px;
    text-align: left;
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    margin-top: 30px;
}
.form-group-full { grid-column: 1 / -1; }

/* 任意バッジ */
.optional-badge {
    font-size: 0.7em;
    background-color: #6c757d;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 5px;
    vertical-align: middle;
}
.form-group-optional input { background-color: #fcfcfc; }

/* --- 診断フォーム (diagnosis.php) --- */
#diagnosis-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.diagnosis-question {
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 0 20px 20px;
    background: #fdfdfd;
    text-align: left;
}

.diagnosis-question h3 {
    font-size: 1.2em;
    color: var(--color-primary);
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.diagnosis-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.diagnosis-options label {
    display: block;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
    background: #fff;
    transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
}

.diagnosis-options label:hover {
    background-color: #f9f9f9;
}

.diagnosis-options input[type="radio"] {
    display: none;
}

.diagnosis-options input[type="radio"]:checked + label {
    border-color: var(--color-primary);
    background-color: #f7fbff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.option-text {
    display: block;
    font-weight: 600;
    font-size: 1em;
    color: #333;
}

.option-pfc {
    display: block;
    font-size: 0.8em;
    color: #555;
    margin-top: 5px;
}

.diagnosis-button {
    padding: 15px;
    font-size: 1.2em;
}

#diagnosis-error {
    color: #d9534f;
    font-weight: bold;
    text-align: center;
    display: none;
}

/* もっと見るボタン */
.see-more-category-link {
    display: block;
    margin: 10px auto 25px;
    padding: 10px;
    background-color: #f8f9fa;
    color: var(--color-primary);
    border: 1px solid #ddd;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
}

/* スマホ対応 */
@media (max-width: 600px) {
    #pfc-form, .diagnosis-options { grid-template-columns: 1fr; }
    .diagnosis-question { padding: 0 15px 15px; }
    
    .index-form-card {
        padding: var(--spacing-xl) var(--spacing-lg);
        border-radius: 20px;
    }
    
    .index-mood-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .index-mood-card {
        min-height: 120px;
        padding: var(--spacing-md);
    }
    
    .index-mood-icon {
        font-size: 2rem;
    }
    
    .index-segment-control {
        max-width: 100%;
    }
    
    .index-segment-text {
        padding: 12px 16px;
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 480px) {
    .index-form-card {
        padding: var(--spacing-lg) var(--spacing-md);
        border-radius: 16px;
    }
    
    #quick-diagnosis-form .index-form-group {
        margin-bottom: var(--spacing-lg);
    }
    
    .index-mood-card {
        min-height: 110px;
    }
}