:root {
    --primary-color: #6d5240;      /* 大地咖啡色 */
    --primary-hover: #543d2e;
    --bg-color: #fcfbf9;         /* 暖白背景 */
    --card-bg: #ffffff;
    --text-main: #4a4a4a;
    --text-light: #8a817c;
    --border-color: #e5e0d8;
    --accent-color: #b58d67;     /* 淺棕色點綴 */
    --error-color: #d9534f;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Noto Sans TC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 2rem 1rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

/* 陰影與卡片設計 */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    margin-bottom: 2rem;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 2rem 0;
}

/* 網格系統 */
.row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.col-2 { flex: 1 1 calc(50% - 0.75rem); }
.col-3 { flex: 1 1 calc(33.333% - 1rem); }
.col-4 { flex: 1 1 calc(33.333% - 1rem); /* 讓下方三等分 */ }

/* 表單元素 */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1rem;
}

label i {
    margin-right: 0.5rem;
    color: var(--accent-color);
}

.required {
    color: var(--error-color);
    margin-left: 2px;
}

input[type="text"],
input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-main);
    background-color: #fff;
    transition: var(--transition);
    font-family: inherit;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(181, 141, 103, 0.1);
}

input::placeholder {
    color: #ccc;
}

/* 數字輸入特製 */
.number-inputs {
    display: flex;
    gap: 1rem;
}

.number-input-wrapper {
    flex: 1;
}

.input-desc {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-light);
}

/* 核取方塊卡片樣式 */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.checkbox-card {
    display: block;
    cursor: pointer;
    margin: 0;
}

.addon-checkbox {
    display: none;
}

.checkbox-content {
    display: flex;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition);
    background: #fff;
}

.checkbox-card:hover .checkbox-content {
    border-color: var(--accent-color);
    background-color: rgba(181, 141, 103, 0.02);
}

.addon-checkbox:checked + .checkbox-content {
    border-color: var(--primary-color);
    background-color: rgba(109, 82, 64, 0.05);
}

.custom-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.addon-checkbox:checked + .checkbox-content .custom-checkbox {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.addon-checkbox:checked + .checkbox-content .custom-checkbox::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: white;
    font-size: 0.7rem;
}

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

.addon-name {
    font-weight: 500;
    color: var(--text-main);
}

.addon-price {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 2px;
}

/* 結果區塊 */
.result-section {
    position: relative;
}

.total-box {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 3rem 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(109, 82, 64, 0.2);
}

.total-label {
    font-size: 1.1rem;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.total-amount {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    font-family: serif; /* 增加質感 */
}

.disclaimer {
    font-size: 0.85rem;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.summary-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.summary-header {
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
}

.summary-header i {
    margin-right: 0.5rem;
}

textarea {
    width: 100%;
    height: 250px;
    padding: 1.5rem;
    border: none;
    background-color: #faf9f7;
    border-radius: 8px;
    resize: vertical;
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-main);
    border-left: 4px solid var(--accent-color);
}

textarea:focus {
    outline: none;
}

.copy-btn {
    display: block;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1.2rem;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.copy-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.copy-btn:active {
    transform: translateY(0);
}

.copy-btn.copied {
    background-color: #4CAF50;
}

/* 響應式微調 */
@media (max-width: 768px) {
    .col-3, .col-2, .col-4 {
        flex: 1 1 100%;
    }
    .total-amount {
        font-size: 3rem;
    }
    .card, .total-box, .summary-box {
        padding: 1.5rem;
    }
}