:root {
    /* 顏色主題調整為環保綠色系 */
    --primary-color: #1abc9c; /* 主色：綠松石色 (Turquoise) */
    --primary-dark: #16a085;
    --secondary-color: #ecf0f1; /* 背景淺灰 */
    --secondary-dark: #c7c9c9;
    --border-color: #dcdde1;
    --danger-color: #e74c3c;
    --font-color: #34495e; /* 深灰藍色文字 */
    --card-bg: #ffffff;
    --tip-color: #f39c12;
}

body {
    font-family: 'Noto Sans TC', sans-serif;
    background-color: var(--secondary-color);
    padding: 30px 15px;
    line-height: 1.6;
    color: var(--font-color);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08); /* 更柔和的陰影 */
}

h1 {
    text-align: center;
    font-size: 2em;
    color: var(--primary-dark);
    border-bottom: 4px solid var(--primary-color);
    padding-bottom: 15px;
    margin-bottom: 40px;
    font-weight: 700;
}

.section-header {
    display: flex;
    align-items: center;
    margin-top: 35px;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

    .section-header h2 {
        margin: 0;
        font-size: 1.5em;
        font-weight: 700;
        color: var(--primary-dark);
    }

    .section-header span {
        font-size: 1.8em;
        margin-right: 15px;
    }

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--font-color);
    font-size: 1.05em;
}

input[type="text"],
input[type="email"],
input[type="file"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-sizing: border-box;
    background-color: #fcfcfc;
    transition: border-color 0.3s, box-shadow 0.3s;
}

    input[type="text"]:focus,
    input[type="email"]:focus {
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(26, 188, 156, 0.2);
        outline: none;
    }

/* 檔案上傳特殊樣式 */
.file-upload-group input[type="file"] {
    border: 2px dashed var(--border-color);
    padding: 20px 15px;
    background-color: #f8f9fb;
    color: var(--font-color);
}

    .file-upload-group input[type="file"]:focus {
        border-color: var(--primary-dark);
        box-shadow: none;
    }

/* 簽名版樣式 (已調整高度) */
#signatureCanvas {
    background-color: #ffffff; /* 確保背景是白色 */
    cursor: crosshair;
    width: 100%; /* 確保 RWD */
    height: 300px; /* 放大簽名區域 */
}


.dual-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 768px) {
    .dual-group {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* 切結聲明樣式 */
.declaration {
    border: 1px solid #f39c12; /* 暖色邊框 */
    padding: 20px;
    margin-top: 30px;
    border-radius: 8px;
    background-color: #fffaf0; /* 淺黃背景 */
    color: #c0392b;
    font-size: 0.95em;
}

    .declaration ol {
        padding-left: 20px;
    }

.declaration-check {
    margin-top: 25px;
    display: flex;
    align-items: flex-start;
    font-weight: 700;
    color: var(--danger-color);
}

    .declaration-check input[type="checkbox"] {
        width: 20px;
        height: 20px;
        margin-right: 12px;
        flex-shrink: 0; /* 防止 checkbox 被文字擠壓 */
        cursor: pointer;
    }

/* 驗證錯誤訊息 */
.error-message {
    color: var(--danger-color);
    font-size: 0.85em;
    margin-top: 5px;
    display: none;
    padding-left: 5px;
    font-weight: 500;
}

.is-invalid {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2) !important; /* 強調紅框 */
    outline: none;
}
/* 針對 Canvas 區塊的錯誤樣式 */
.form-group > div.is-invalid {
    border: 2px solid var(--danger-color) !important;
    box-shadow: 0 0 0 1px var(--danger-color) !important;
}

/* 送出按鈕 */
button[type="submit"] {
    display: block;
    width: 100%;
    padding: 15px;
    margin-top: 40px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.2em;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

    button[type="submit"]:hover {
        background-color: var(--primary-dark);
    }

    button[type="submit"]:active {
        transform: scale(0.99);
    }

.clearbutton {
    display: block;
    width: 100%;
    padding: 15px;
    margin-top: 40px;
    background-color: #ADADAD;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.2em;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

    .clearbutton:hover {
        background-color: #5B5B5B;
    }

.clearbutton:active {
    transform: scale(0.99);
}

.triple-group {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}

.declaration-header {
    font-size: 1.1em;
    font-weight: 700;
    color: #c0392b;
    border-bottom: 1px solid #f39c12;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.declaration-check-item {
    margin-top: 15px;
    display: flex;
    align-items: flex-start;
    font-weight: 500;
    color: var(--font-color);
}

.declaration-check-item input[type="checkbox"] {
        width: 20px;
        height: 20px;
        margin-right: 12px;
        flex-shrink: 0;
        cursor: pointer;
    }

.label-text-wrapper {
    display: inline-block;
}

.tip-container {
    display: inline-block;
    position: relative;
    margin-left: 10px;
    font-size: 1.1em;
    color: var(--tip-color);
    line-height: 1;
}

.tip-icon {
    cursor: pointer;
}

.tooltip-text {
    visibility: hidden;
    width: 220px;
    background-color: #555;
    color: #fff;
    text-align: left;
    border-radius: 6px;
    padding: 8px 10px;
    position: absolute;
    z-index: 100;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85em;
    font-weight: 400;
    line-height: 1.4;
    white-space: normal;
}

    /* Tooltip arrow */
    .tooltip-text::after {
        content: "";
        position: absolute;
        top: 100%;
        left: 50%;
        margin-left: -5px;
        border-width: 5px;
        border-style: solid;
        border-color: #555 transparent transparent transparent;
    }

.tip-container:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}