/* ===============================================================
   Step 4 Radio Button Grid Styles
   註冊流程步驟四 - 單選按鈕網格樣式
   =============================================================== */

/* 網格容器 */
.radio-grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 12px;
}

/* 單選卡片 */
.radio-card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.2s ease;
}

/* 隱藏原生 radio input */
.radio-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

/* 自訂標籤樣式 */
.radio-card-label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px 16px;
    background: #fff;
    border: 2px solid #e0e7ff;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: #4b5563;
    text-align: center;
    transition: all 0.2s ease;
    min-height: 50px;
    user-select: none;
}

/* Hover 效果 */
.radio-card:hover .radio-card-label {
    border-color: #6366f1;
    background: #f0f4ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

/* 選中狀態 */
.radio-card input[type="radio"]:checked+.radio-card-label {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-color: #6366f1;
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

/* 選中狀態的 Checkmark icon */
.radio-card input[type="radio"]:checked+.radio-card-label::before {
    content: "✓";
    margin-right: 6px;
    font-size: 16px;
    font-weight: bold;
}

/* 焦點狀態（無障礙） */
.radio-card input[type="radio"]:focus+.radio-card-label {
    outline: 3px solid rgba(99, 102, 241, 0.4);
    outline-offset: 2px;
}

/* 禁用狀態 */
.radio-card input[type="radio"]:disabled+.radio-card-label {
    opacity: 0.5;
    cursor: not-allowed;
    background: #f3f4f6;
}

.radio-card input[type="radio"]:disabled:hover+.radio-card-label {
    transform: none;
    box-shadow: none;
}

/* ===============================================================
   響應式斷點
   =============================================================== */

/* 平板 (768px - 991px): 2列 */
@media (max-width: 991px) {
    .radio-grid-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .radio-card-label {
        padding: 12px 14px;
        font-size: 13px;
        min-height: 46px;
    }
}

/* 手機 (< 768px): 1列 */
@media (max-width: 767px) {
    .radio-grid-container {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .radio-card-label {
        padding: 14px 16px;
        font-size: 14px;
        min-height: 50px;
        justify-content: flex-start;
    }
}

/* 超小螢幕 (< 480px) */
@media (max-width: 479px) {
    .radio-grid-container {
        gap: 6px;
    }

    .radio-card-label {
        padding: 12px 14px;
        font-size: 13px;
        min-height: 44px;
    }
}

/* ===============================================================
   與現有 info-card 樣式整合
   =============================================================== */

/* 讓 radio-grid 與 info-card 內的其他元素間距一致 */
.info-card-content .radio-grid-container {
    margin-top: 8px;
    margin-bottom: 4px;
}

/* 錯誤訊息與 radio-grid 的間距 */
.info-card-content .radio-grid-container+.form-error {
    margin-top: 8px;
}

/* ===============================================================
   動畫效果
   =============================================================== */

/* 載入時淡入動畫 */
@keyframes fadeInGrid {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.radio-grid-container {
    animation: fadeInGrid 0.3s ease-out;
}

/* 卡片依序出現效果 */
.radio-card {
    animation: fadeInCard 0.3s ease-out backwards;
}

.radio-card:nth-child(1) {
    animation-delay: 0.05s;
}

.radio-card:nth-child(2) {
    animation-delay: 0.1s;
}

.radio-card:nth-child(3) {
    animation-delay: 0.15s;
}

.radio-card:nth-child(4) {
    animation-delay: 0.2s;
}

.radio-card:nth-child(5) {
    animation-delay: 0.25s;
}

.radio-card:nth-child(6) {
    animation-delay: 0.3s;
}

@keyframes fadeInCard {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===============================================================
   深色模式支援（可選）
   =============================================================== */

@media (prefers-color-scheme: dark) {
    .radio-card-label {
        background: #1f2937;
        border-color: #374151;
        color: #d1d5db;
    }

    .radio-card:hover .radio-card-label {
        background: #273447;
        border-color: #6366f1;
    }

    .radio-card input[type="radio"]:disabled+.radio-card-label {
        background: #111827;
    }
}