/* CSS 变量 */
:root {
    --color-primary: #2E8B57;
    --color-secondary: #1E3A8A;
    --color-accent: #F59E0B;
    --color-text-primary: #111827;
    --color-text-secondary: #374151;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;
    --color-bg-light: #F9FAFB;
    --color-bg-lighter: #F3F4F6;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Montserrat', sans-serif;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-text-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-primary);
    font-size: 24px;
}

.nav-logo span {
    font-size: 12px;
    color: var(--color-text-muted);
    display: block;
    margin-top: -5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* 下拉菜单样式 */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 200px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    list-style: none;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: #374151;
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: 0;
}

.dropdown-menu a:hover {
    background: var(--color-bg-lighter);
    color: var(--color-primary);
    padding-left: 25px;
}

.dropdown-menu a::after {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #111827;
    margin: 3px 0;
    transition: 0.3s;
}

.card-link {
    cursor: pointer;
}

.card-link:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
}

/* 英雄区 */
.hero-section {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="%232E8B57" opacity="0.3"><animate attributeName="opacity" values="0.3;0.8;0.3" dur="3s" repeatCount="indefinite"/></circle><circle cx="80" cy="30" r="1" fill="%231E3A8A" opacity="0.4"><animate attributeName="opacity" values="0.4;0.9;0.4" dur="4s" repeatCount="indefinite"/></circle><circle cx="60" cy="70" r="1" fill="%23F59E0B" opacity="0.3"><animate attributeName="opacity" values="0.3;0.7;0.3" dur="5s" repeatCount="indefinite"/></circle></svg>') repeat;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.hero-gradient {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(45deg, transparent 0%, rgba(46, 139, 87, 0.1) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text {
    animation: slideInLeft 1s ease-out;
}

.hero-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #2E8B57 0%, #1E3A8A 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: #F59E0B;
    margin-bottom: 15px;
}

.hero-description {
    font-size: 1.1rem;
    color: #6B7280;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn-primary, .btn-secondary {
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, #2E8B57 0%, #1E3A8A 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(46, 139, 87, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #2E8B57;
    border: 2px solid #2E8B57;
}

.btn-secondary:hover {
    background: #2E8B57;
    color: white;
    transform: translateY(-2px);
}

.hero-images {
    animation: slideInRight 1s ease-out;
}

.hero-image-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    position: relative;
}

.hero-image-item {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    aspect-ratio: 1;
    transition: transform 0.3s ease;
}

.hero-image-item:first-child {
    grid-column: 1 / -1;
    aspect-ratio: 2/1;
}

.hero-image-item:hover {
    transform: scale(1.05);
}

.hero-image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
    padding: 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.hero-image-item:hover .image-overlay {
    transform: translateY(0);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: #6B7280;
    z-index: 2;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid #2E8B57;
    border-bottom: 2px solid #2E8B57;
    transform: rotate(45deg);
    margin: 0 auto 10px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) rotate(45deg); }
    40% { transform: translateY(-10px) rotate(45deg); }
    60% { transform: translateY(-5px) rotate(45deg); }
}

/* 动画 */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 章节通用样式 */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 20px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #2E8B57 0%, #1E3A8A 100%);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #6B7280;
}

/* 岩棉的旅程 */
.journey-section {
    padding: 100px 0;
    background: #f9fafb;
}

.journey-step {
    margin-bottom: 100px;
}

.step-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.journey-step.reverse .step-content {
    direction: rtl;
}

.journey-step.reverse .step-text {
    direction: ltr;
}

.step-text h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2rem;
    font-weight: 600;
    color: #111827;
    margin-bottom: 20px;
}

.step-text p {
    font-size: 1.1rem;
    color: #6B7280;
    margin-bottom: 30px;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: #374151;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #2E8B57;
    font-weight: bold;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.grid-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.grid-image:hover {
    transform: scale(1.05);
}

.performance-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #2E8B57;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: #6B7280;
}

/* 应用领域 */
.applications-section {
    padding: 100px 0;
    background: white;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.application-card {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.application-card:hover {
    transform: translateY(-10px);
}

.card-header h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #111827;
    margin-bottom: 10px;
}

.card-header p {
    color: #6B7280;
    margin-bottom: 20px;
}

.card-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.card-image {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: 10px;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.feature-tag {
    background: linear-gradient(135deg, #2E8B57 0%, #1E3A8A 100%);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* 绿色承诺 */
.commitment-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.commitment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.commitment-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.commitment-card:hover {
    transform: translateY(-10px);
}

.card-icon {
    margin-bottom: 20px;
}

.icon-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2E8B57 0%, #1E3A8A 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto;
}

.commitment-card h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #111827;
    margin-bottom: 15px;
}

.commitment-card p {
    color: #6B7280;
    margin-bottom: 20px;
}

.cert-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.cert-image {
    width: 100%;
    height: 80px;
    object-fit: cover;
    border-radius: 10px;
}

/* 联系我们 */
.contact-section {
    padding: 100px 0;
    background: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.info-icon {
    font-size: 1.5rem;
    margin-right: 15px;
    margin-top: 5px;
}

.info-text h4 {
    font-weight: 600;
    color: #111827;
    margin-bottom: 5px;
}

.info-text p {
    color: #6B7280;
    margin-bottom: 5px;
}

.contact-image-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.contact-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 15px;
}

/* 页脚 */
.footer {
    background: #111827;
    color: white;
    padding: 40px 0;
}

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

.footer-logo h3 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    margin-bottom: 10px;
}

.footer-logo p {
    color: #9CA3AF;
}

.footer-info {
    text-align: right;
}

.footer-info p {
    color: #9CA3AF;
    margin-bottom: 5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .step-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .journey-step.reverse .step-content {
        direction: ltr;
    }

    .performance-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .applications-grid {
        grid-template-columns: 1fr;
    }

    .commitment-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer-info {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .image-grid {
        grid-template-columns: 1fr;
    }

    .card-images {
        grid-template-columns: 1fr;
    }

    .cert-images {
        grid-template-columns: 1fr;
    }

    .contact-image-grid {
        grid-template-columns: 1fr;
    }
}