:root {
    --primary-color: #8c6239;
    --primary-hover: #815a33;
    --gray-text: #666;
    --light-gray: #f8f8f8;
    --border-color: #ccc;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft JhengHei", sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: #fafafa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

/* 1.2 主頁面寬度容器 */
.container {
    max-width: 900px;
    margin: 0 auto;
    background: #ffffff;
    padding: 20px;
}

/* 1.3 頂部標題與說明文字 */
.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 24px;
    font-weight: bold;
    color: #222;
    margin-bottom: 2px;
    letter-spacing: 1px;
}

.header .subtitle {
    font-size: 30px;
    font-style:inherit;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
}

.header .notice {
    font-size: 13px;
    color: var(--gray-text);
    max-width: 750px;
    margin: 0 auto 10px auto;
    text-align: left;
    word-break: break-all;
}

.header .highlight {
    color: var(--primary-color);
    font-weight: bold;
}

.header .cs-link {
    color: #4a90e2;
    text-decoration: underline;
    cursor: pointer;
}

.header .tutorial-link {
    font-size: 13px;
    color: var(--gray-text);
    text-align: left;
    max-width: 750px;
    margin: 0 auto;
    display: flex;
    align-items: center;
}

.header .tutorial-link .icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    margin-right: 5px;
    font-size: 10px;
}

.header .tutorial-link a {
    color: var(--primary-color);
    text-decoration: underline;
    font-weight: bold;
}


/* 2.1 步驟區塊基本標題 */
.step-container {
    margin-bottom: 35px;
}

.step-title {
    font-size: 18px;
    font-weight: bold;
    color: #222;
    margin-bottom: 15px;
}


.form-bg {
    background-color: var(--light-gray);
    padding: 25px;
    border-radius: 4px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: #444;
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 2px;
    background-color: #ffffff;
    outline: none;
    transition: border-color 0.2s;
}

.form-control:focus {
    border-color: var(--primary-color);
}



.options-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
}


.option-card {
    display: flex;
    align-items: center;
    border: 1px solid #eee;
    border-radius: 8px; 
    padding: 10px 15px; 
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: #ffffff;
    position: relative;
    max-width: 280px;  
    width: 100%;
}

.option-card:hover {
    border-color: var(--border-color);
}


.option-card.selected {
    border-color: var(--primary-color);
    background-color: #fffefb;
    box-shadow: 0 2px 8px rgba(230, 31, 98, 0.08);
}


.option-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.option-media {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    flex-shrink: 0;
    overflow: hidden; 
}

.option-media img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
}

.option-info {
    display: flex;
    flex-direction: column;
}

.option-label {
    font-size: 15px;
    font-weight: bold;
    color: #333;
    letter-spacing: 0.5px;
}


/* 3.1 計算與重算按鈕群組 */
.btn-group {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    margin-bottom: 15px;
}

.btn {
    padding: 12px 24px;
    font-size: 14px;
    font-weight: bold;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.2s;
}

/* 計算按鈕：桃粉色 */
.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
}

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

/* 清除重算按鈕：灰色 */
.btn-secondary {
    background-color: #9b9b9b;
    color: #ffffff;
}

.btn-secondary:hover {
    background-color: #828282;
}

/* 3.2 底部貼心提醒 */
.footer-tips {
    font-size: 12px;
    color: var(--gray-text);
    line-height: 1.8;
}

/* 3.3 彈出尺寸結果視窗背景遮罩 (Modal Overlay) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

/* 當視窗被觸發啟用時 */
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 3.4 彈出視窗白底卡片本體 */
.modal-content {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    max-width: 450px;
    width: 90%;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: relative;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

/* 視窗彈出時的由上往下平滑動畫 */
.modal-overlay.active .modal-content {
    transform: translateY(0);
}

/* 右上角關閉按鈕 [X] */
.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 20px;
    color: #999;
    cursor: pointer;
    border: none;
    background: none;
}

.modal-close:hover {
    color: #333;
}

/* 3.5 彈出視窗內部的文字與大尺寸數字 */
.result-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #222;
}

.result-size {
    font-size: 36px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.result-desc {
    font-size: 14px;
    color: #555;
    margin-bottom: 20px;
}