/* ============================================
   Reset & Base Styles
   ============================================ */

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

:root {
    /* Color Palette - 基於 CI 配色（根據 logo 調整） */
    /* 
     * 配色說明：
     * 1. 請查看 logo 圖片（LINE_ALBUM_logo 去背圖_231025_7.jpg）的主要顏色
     * 2. 使用顏色選擇工具（如 Photoshop、Figma、或線上工具）提取 logo 的主色
     * 3. 將主色填入 --primary-blue，並依此衍生其他色階
     * 
     * 目前使用專業醫療生技常見配色：
     * - 深藍色系：專業、信賴、穩重（適合 B2B）
     * - 青藍色：科技感、創新
     * - 橘色：溫暖、親和（作為強調色）
     */
    --primary-blue: #1E4D7A;        /* 深藍色 - 專業穩重（主要 CI 色，請根據 logo 調整） */
    --primary-blue-dark: #0F3D5C;   /* 更深藍色（主色 -20% 亮度） */
    --primary-blue-light: #4A7BA7;  /* 淺藍色（主色 +30% 亮度） */
    --accent-teal: #2D7A8B;         /* 青藍色 - 科技感（輔助色） */
    --accent-orange: #E67E22;       /* 橘色 - 溫暖信賴（強調色） */
    --text-dark: #1A1A1A;
    --text-gray: #4A5568;
    --text-light: #718096;
    --bg-light: #F7FAFC;
    --bg-white: #FFFFFF;
    --bg-section: #EDF2F7;
    --border-light: #E2E8F0;
    
    /* Typography */
    --font-chinese: 'Microsoft JhengHei', 'PingFang TC', -apple-system, sans-serif;
    --font-english: -apple-system, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-chinese);
    color: var(--text-dark);
    line-height: 1.6;
    font-size: 1rem;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Top Navigation
   ============================================ */

.top-nav {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.top-nav .container {
    max-width: 1400px;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo {
    max-height: 60px;
    width: auto;
    transition: var(--transition);
}

.nav-logo-link:hover .logo {
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95em;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
    border-radius: 2px;
}

/* ============================================
   Header & Hero
   ============================================ */

.header {
    background: var(--primary-blue);
    color: var(--bg-white);
    position: relative;
    overflow: hidden;
    margin-top: 0;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('image/laboratory.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.4;
}

.header::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* 使用全站主色深藍色遮罩 */
    background: linear-gradient(135deg, rgba(30, 77, 122, 0.65) 0%, rgba(15, 61, 92, 0.7) 100%);
    z-index: 1;
}

.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 2;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-title {
    font-size: 3em;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    font-family: var(--font-chinese);
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: 1.3em;
    opacity: 0.95;
    font-weight: 400;
    letter-spacing: 0.02em;
    font-family: var(--font-english);
}

/* ============================================
   Sections
   ============================================ */

.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5em;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.2em;
    color: var(--text-gray);
    font-weight: 400;
    line-height: 1.6;
}

.section-hint {
    font-size: 1em;
    color: var(--primary-blue);
    margin-top: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.section-hint i {
    font-size: 1.1em;
}

/* ============================================
   關於二氧化氯 Section
   ============================================ */

.about-clo2 {
    background-color: var(--bg-section);
}

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

.text-content {
    margin-bottom: var(--spacing-xl);
}

.text-block {
    margin-bottom: var(--spacing-lg);
}

.text-block.english {
    border-left: 4px solid var(--primary-blue);
    padding-left: var(--spacing-md);
}

.text-title {
    font-size: 1.5em;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.text-paragraph {
    font-size: 1.1em;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
}

.certification-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.cert-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.cert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.cert-icon {
    font-size: 3em;
    margin-bottom: var(--spacing-sm);
}

.cert-title {
    font-size: 1.2em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.cert-desc {
    color: var(--text-gray);
    font-size: 0.95em;
}

/* ============================================
   產品資訊 Section
   ============================================ */

.product-info {
    background-color: var(--bg-white);
}

.product-images {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.product-image-item {
    background: var(--bg-light);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    aspect-ratio: 1 / 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.product-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
    display: block;
}

.info-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.info-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    font-size: 2.5em;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.info-title {
    font-size: 1.3em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.info-list {
    list-style: none;
    padding: 0;
}

.info-list li {
    padding: var(--spacing-xs) 0;
    color: var(--text-gray);
    padding-left: var(--spacing-md);
    position: relative;
}

.info-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: bold;
}

.specs-table-wrapper {
    margin-top: var(--spacing-xl);
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 12px;
}

.table-title {
    font-size: 1.5em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
}

.specs-table thead {
    background: var(--primary-blue);
    color: var(--bg-white);
}

.specs-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 1.1em;
}

.specs-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-gray);
}

.specs-table tbody tr:last-child td {
    border-bottom: none;
}

.specs-table tbody tr:hover {
    background-color: var(--bg-light);
}

/* ============================================
   應用範圍 Section
   ============================================ */

.applications {
    background-color: var(--bg-white);
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.applications-grid-3x2 {
    grid-template-columns: repeat(3, 1fr);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.app-item {
    text-align: center;
    transition: var(--transition);
}

.app-item:hover {
    transform: translateY(-5px);
}

.app-icon-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 3px solid var(--accent-teal);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
    background: var(--bg-white);
    transition: var(--transition);
}

.app-item:hover .app-icon-circle {
    background: var(--accent-teal);
    color: var(--bg-white);
}

.app-icon-circle i {
    font-size: 2.5em;
    color: var(--accent-teal);
    transition: var(--transition);
}

.app-item:hover .app-icon-circle i {
    color: var(--bg-white);
}

.app-title {
    font-size: 1em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    font-family: var(--font-english);
}

.app-desc {
    font-size: 0.9em;
    color: var(--text-gray);
}

.usage-steps {
    margin-top: var(--spacing-xl);
}

.steps-title {
    font-size: 2em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.steps-grid-custom {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.steps-grid-custom .step-card:nth-child(n+4) {
    grid-column: span 1;
}

.steps-grid-custom .step-card:nth-child(4) {
    grid-column: 1 / 2;
}

.steps-grid-custom .step-card:nth-child(5) {
    grid-column: 2 / 3;
    justify-self: center;
    max-width: 400px;
}

.step-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-blue);
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary-blue);
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    font-weight: bold;
    margin-bottom: var(--spacing-sm);
}

.step-title {
    font-size: 1.2em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.step-desc {
    color: var(--text-gray);
    line-height: 1.6;
}

/* ============================================
   檢驗報告 Section
   ============================================ */

.safety-reports {
    background-color: var(--bg-white);
}

.safety-content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.section-sub-heading {
    font-size: 1.5em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.table-section {
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 12px;
}

.safety-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-white);
    border-radius: 8px;
    overflow: hidden;
}

.safety-table thead {
    background: var(--primary-blue);
    color: var(--bg-white);
}

.safety-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 1em;
}

.safety-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-gray);
    line-height: 1.6;
}

.safety-table tbody tr:last-child td {
    border-bottom: none;
}

.safety-table tbody tr:hover {
    background-color: var(--bg-light);
}

.features-section {
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 12px;
}

.feature-item {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    align-items: flex-start;
}

.feature-item .feature-icon {
    font-size: 2em;
    flex-shrink: 0;
}

.feature-content {
    flex: 1;
}

.feature-content p {
    color: var(--text-gray);
    line-height: 1.6;
    margin: 0;
}

.highlight {
    color: var(--primary-blue);
    font-weight: 600;
}

.note {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--primary-blue);
    margin-top: var(--spacing-md);
    font-size: 0.95em;
    color: var(--text-gray);
    line-height: 1.6;
}

.safety-image-section {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.image-hint {
    color: var(--primary-blue);
    font-size: 0.95em;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-weight: 500;
}

.image-hint i {
    font-size: 1.1em;
}

.report-image-item {
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.report-image-item.clickable-image {
    cursor: pointer;
}

.report-image-item.clickable-image:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.report-image-item.clickable-image:hover .report-image {
    opacity: 0.9;
}

.report-image-item .report-image {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    transition: var(--transition);
}

/* Image Modal/Lightbox */
.image-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.image-modal.active {
    display: flex;
    opacity: 1;
}

.image-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    cursor: pointer;
}

.image-modal-content {
    position: relative;
    z-index: 10001;
    max-width: 95%;
    max-height: 95vh;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.image-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: var(--bg-white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    transition: var(--transition);
    z-index: 10002;
}

.image-modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.8);
    transform: rotate(90deg);
}

.modal-image {
    max-width: 100%;
    max-height: 95vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.efficacy-reports {
    background-color: var(--bg-section);
}

.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.report-item {
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
    border: 1px solid var(--border-light);
}

.report-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.report-image-wrapper {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

.report-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.report-link {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--primary-blue);
    padding: var(--spacing-md);
    transition: var(--transition);
    background: var(--bg-light);
}

.pdf-link {
    cursor: pointer;
}

.report-link:hover,
.pdf-link:hover {
    background: var(--primary-blue);
    color: var(--bg-white);
}

.report-icon {
    font-size: 4em;
    margin-bottom: var(--spacing-sm);
}

.report-label {
    text-align: center;
    font-weight: 600;
    font-size: 1em;
    margin: var(--spacing-sm) var(--spacing-md) var(--spacing-xs);
    color: inherit;
}

.report-hint {
    text-align: center;
    font-size: 0.85em;
    margin-top: var(--spacing-xs);
    opacity: 0.7;
    color: inherit;
}

.report-link .report-label,
.pdf-link .report-label {
    color: var(--text-dark);
}

.report-link:hover .report-label,
.pdf-link:hover .report-label,
.report-link:hover .report-hint,
.pdf-link:hover .report-hint {
    color: var(--bg-white);
}

/* PDF Modal/Lightbox */
.pdf-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10001;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.pdf-modal.active {
    display: flex;
    opacity: 1;
}

.pdf-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    cursor: pointer;
}

.pdf-modal-content {
    position: relative;
    z-index: 10002;
    width: 95%;
    max-width: 1200px;
    height: 90vh;
    max-height: 900px;
    background: var(--bg-white);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    animation: modalFadeIn 0.3s ease;
    overflow: hidden;
}

.pdf-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--primary-blue);
    color: var(--bg-white);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.pdf-modal-title {
    font-size: 1.3em;
    font-weight: 600;
    margin: 0;
    color: var(--bg-white);
}

.pdf-modal-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.pdf-download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    color: var(--bg-white);
    text-decoration: none;
    border-radius: 6px;
    transition: var(--transition);
    font-size: 0.95em;
}

.pdf-download-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.pdf-modal-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--bg-white);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2em;
    transition: var(--transition);
}

.pdf-modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.pdf-modal-body {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #525252;
}

.pdf-iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

.pdf-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--bg-white);
    z-index: 1;
}

.pdf-loading i {
    font-size: 3em;
    margin-bottom: var(--spacing-sm);
}

.pdf-loading p {
    font-size: 1.1em;
    margin: 0;
}

/* ============================================
   產品特色 Section
   ============================================ */

.features {
    background-color: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue-light);
}

.feature-icon {
    font-size: 3em;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 1.3em;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.feature-desc {
    color: var(--text-gray);
    font-size: 0.95em;
    line-height: 1.6;
}

/* ============================================
   CTA Section
   ============================================ */

.cta {
    background: var(--primary-blue);
    color: var(--bg-white);
    text-align: center;
    padding: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('image/laboratory2.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.4;
}

.cta::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* 使用全站主色深藍色遮罩 */
    background: linear-gradient(135deg, rgba(30, 77, 122, 0.65) 0%, rgba(15, 61, 92, 0.7) 100%);
    z-index: 1;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.cta-title {
    font-size: 2.5em;
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.cta-subtitle {
    font-size: 1.3em;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1em;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--bg-white);
    color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid var(--bg-white);
}

.btn-secondary:hover {
    background: var(--bg-white);
    color: var(--primary-blue);
    transform: translateY(-3px);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--text-dark);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.footer-col {
    display: flex;
    flex-direction: column;
}

.footer-title {
    font-size: 1.3em;
    margin-bottom: var(--spacing-md);
    color: var(--bg-white);
    font-weight: 600;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

.footer-text i {
    margin-right: var(--spacing-xs);
    color: var(--primary-blue-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}

/* ============================================
   Animation Classes
   ============================================ */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet */
@media (max-width: 1199px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2.5em;
    }
    
    .hero-subtitle {
        font-size: 1.1em;
    }
    
    .section-title {
        font-size: 2em;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
}

/* Tablet */
@media (max-width: 1024px) {
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.9em;
        padding: var(--spacing-xs);
    }
    
    .safety-content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .applications-grid-3x2 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .steps-grid-custom {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .steps-grid-custom .step-card:nth-child(5) {
        grid-column: 3 / 4;
    }
}

/* Mobile */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--border-light);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
        font-size: 1em;
        width: 100%;
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .logo {
        max-height: 50px;
    }
    
    .hero {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2em;
    }
    
    .hero-subtitle {
        font-size: 1em;
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
    
    .section-title {
        font-size: 1.8em;
    }
    
    .section-subtitle {
        font-size: 1em;
    }
    
    .certification-grid,
    .info-cards-grid,
    .applications-grid,
    .applications-grid-3x2,
    .features-grid,
    .steps-grid,
    .steps-grid-custom {
        grid-template-columns: 1fr;
    }
    
    .steps-grid-custom .step-card:nth-child(5) {
        grid-column: 1;
        max-width: 100%;
    }
    
    .app-icon-circle {
        width: 100px;
        height: 100px;
    }
    
    .app-icon-circle i {
        font-size: 2em;
    }
    
    .cta-title {
        font-size: 1.8em;
    }
    
    .cta-subtitle {
        font-size: 1.1em;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .text-block.english {
        border-left: 2px solid var(--primary-blue);
        padding-left: var(--spacing-sm);
    }
    
    .safety-content-wrapper {
        grid-template-columns: 1fr;
    }
    
    .image-modal-close {
        top: 10px;
        right: 10px;
        background: rgba(0, 0, 0, 0.7);
    }
    
    .image-modal-content {
        max-width: 100%;
        max-height: 100vh;
        padding: 40px 20px 20px;
    }
    
    .pdf-modal-content {
        width: 100%;
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
    }
    
    .pdf-modal-header {
        padding: var(--spacing-sm);
    }
    
    .pdf-modal-title {
        font-size: 1.1em;
    }
    
    .pdf-download-btn {
        padding: var(--spacing-xs);
        font-size: 0.85em;
    }
    
    .pdf-modal-close {
        width: 32px;
        height: 32px;
        font-size: 1em;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6em;
    }
    
    .section-title {
        font-size: 1.5em;
    }
    
    .specs-table {
        font-size: 0.9em;
    }
    
    .specs-table th,
    .specs-table td {
        padding: var(--spacing-sm);
    }
    
    .product-images {
        grid-template-columns: 1fr;
    }
    
    .reports-grid {
        grid-template-columns: 1fr;
    }
}