* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #6a8d73; 
    --primary-light: #8aa597;
    --primary-dark: #4a6d53;
    --accent: #c9d5b9; 
    --dark: #3a4a42; 
    --light: #f8faf7; 
    --earth: #a67c52; 
    --water: #5d7a8d; 
    --gold: #d4af37; 
    --gray: #e9ecef;
    --transition: all 0.4s ease;
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --panel-max-height: 80vh; 
}
body {
    background: linear-gradient(135deg, #f0f5ed 0%, #e6ebe2 100%);
    color: var(--dark);
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    position: relative;
    overflow-x: hidden; 
}
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 10% 20%, rgba(106, 141, 115, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(93, 122, 141, 0.03) 0%, transparent 40%);
    z-index: -2;
}
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
/* �������� */
.section-header {
    text-align: center;
    margin: 2rem 0 1.5rem;
    position: relative;
    flex-shrink: 0; 
}
.section-header h1 {
    font-size: 2.8rem;
    color: var(--dark);
    margin-bottom: 1rem;
    font-weight: 700;
    position: relative;
    display: inline-block;
}
.section-header h1::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--gold));
    border-radius: 2px;
}
.section-header p {
    color: var(--dark);
    opacity: 0.85;
    font-size: 1.2rem;
    max-width: 800px;
    margin: 1rem auto 0;
    line-height: 1.7;
}

.products-showcase {
    display: flex;
    height: var(--panel-max-height); 
    margin: 1rem 0 2rem;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden; 
    flex-shrink: 0; 
}

.series-nav {
    flex: 0 0 300px; 
    background: linear-gradient(180deg, var(--light) 0%, #f0f5ed 100%);
    border-right: 1px solid rgba(106, 141, 115, 0.15);
    position: relative;
    display: flex;
    flex-direction: column;
    max-height: var(--panel-max-height); 
    overflow: hidden; 
}

.nav-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(106, 141, 115, 0.2);
    background: rgba(255, 255, 255, 0.9);
    z-index: 10;
    position: sticky;
    top: 0;
}
.nav-header h2 {
    font-size: 1.6rem;
    color: var(--dark);
    font-weight: 600;
}

.nav-items-container {
    flex: 1;
    overflow-y: auto;
    padding: 0 0 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}
.nav-items-container::-webkit-scrollbar {
    width: 6px;
}
.nav-items-container::-webkit-scrollbar-track {
    background: transparent;
}
.nav-items-container::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: 10px;
}
.nav-items {
    padding: 0 1.5rem;
}
.nav-item {
    display: flex;
    align-items: center;
    padding: 1.2rem 1.2rem;
    margin-bottom: 0.8rem;
    background: white;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}
.nav-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: var(--transition);
}
.nav-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}
.nav-item:hover::before,
.nav-item.active::before {
    transform: scaleY(1);
}
.nav-item.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 5px 15px rgba(106, 141, 115, 0.3);
}
.nav-item.active .nav-icon,
.nav-item.active .nav-title {
    color: white;
}
.nav-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--dark);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    font-size: 1.1rem;
    transition: var(--transition);
}
.nav-item:hover .nav-icon {
    background: var(--primary-light);
    transform: scale(1.1);
}
.nav-item.active .nav-icon {
    background: white;
}
.nav-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--dark);
    transition: var(--transition);
}
.nav-badge {
    margin-left: auto;
    background: var(--primary-light);
    color: white;
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-weight: 500;
}
.nav-item.active .nav-badge {
    background: rgba(255, 255, 255, 0.3);
}

.series-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-height: var(--panel-max-height);
    position: relative;
}

.series-content-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 0; 
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}
.series-content-scroll::-webkit-scrollbar {
    width: 8px;
}
.series-content-scroll::-webkit-scrollbar-track {
    background: var(--light);
    border-radius: 4px;
}
.series-content-scroll::-webkit-scrollbar-thumb {
    background-color: var(--primary);
    border-radius: 4px;
}

.content-header-container {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid rgba(106, 141, 115, 0.08);
}
.content-header {
    margin-bottom: 2rem;
}
.content-title {
    font-size: 2.4rem;
    color: var(--dark);
    margin-bottom: 0.8rem;
    font-weight: 700;
}
.content-subtitle {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 1.2rem;
    font-weight: 500;
    position: relative;
    padding-left: 15px;
}
.content-subtitle::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 70%;
    background: var(--gold);
    border-radius: 3px;
}
.content-description {
    color: #555;
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    max-width: 800px;
}

.highlights-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 0 2rem;
}
.highlight-card {
    background: white;
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(106, 141, 115, 0.1);
}
.highlight-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}
.highlight-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.3rem;
}
.highlight-title {
    font-size: 1.3rem;
    margin-bottom: 0.7rem;
    color: var(--dark);
    font-weight: 600;
}
.highlight-text {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

.specs-container {
    background: linear-gradient(135deg, var(--light) 0%, #edf3e9 100%);
    border-radius: var(--border-radius-md);
    padding: 1.8rem;
    margin: 2rem 0;
    border: 1px solid rgba(106, 141, 115, 0.15);
    padding: 1.8rem 2rem;
    margin: 2rem 0 2rem 2rem;
    width: calc(100% - 2rem);
}
.specs-title {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
}
.specs-title i {
    margin-right: 10px;
    color: var(--primary);
}
.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.2rem;
}
.spec-item {
    text-align: center;
}
.spec-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.4rem;
}
.spec-label {
    color: #666;
    font-size: 0.9rem;
}

.application-section {
    margin: 2.5rem 0;
    padding: 0 2rem;
}
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.8rem;
    margin-top: 1.2rem;
}
.application-card {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}
.application-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}
.application-img {
    height: 160px;
    background-size: cover;
    background-position: center;
    position: relative;
}
.application-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(58, 74, 66, 0.9) 0%, transparent 100%);
    padding: 0.9rem 1.2rem;
    color: white;
}
.application-title {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
}
.application-desc {
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.4;
}
.application-content {
    padding: 1.2rem;
    background: white;
    flex-grow: 1;
}
.application-content p {
    color: #555;
    line-height: 1.6;
    font-size: 0.95rem;
}

.cta-section {
    margin: 2.5rem 0;
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(106, 141, 115, 0.08) 0%, rgba(93, 122, 141, 0.08) 100%);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(106, 141, 115, 0.15);
    margin: 2.5rem 2rem 2.5rem 0;
    width: calc(100% - 2rem);
}
.cta-title {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
    color: var(--dark);
}
.cta-text {
    color: #666;
    margin-bottom: 1.8rem;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
    font-size: 1rem;
}
.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(106, 141, 115, 0.4);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(106, 141, 115, 0.5);
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

@media (max-width: 1200px) {
    .products-showcase {
        flex-direction: column;
        height: auto;
        max-height: 90vh;
    }
    .series-nav {
        flex: 0 0 200px;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid rgba(106, 141, 115, 0.15);
    }
    .nav-items {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.8rem;
        padding: 0 1rem;
    }
    .nav-item {
        padding: 0.8rem;
        margin-bottom: 0;
    }
    .series-content {
        max-height: calc(90vh - 200px); 
    }
    .content-title {
        font-size: 2rem;
    }
    .highlights-section,
    .application-section,
    .specs-container,
    .cta-section {
        padding: 0 1rem;
    }
    .specs-container,
    .cta-section {
        margin-right: 1rem;
        width: calc(100% - 1rem);
    }
}
@media (max-width: 768px) {
    .section-header h1 {
        font-size: 2.2rem;
    }
    .content-title {
        font-size: 1.8rem;
    }
    .content-subtitle {
        font-size: 1rem;
    }
    .specs-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    .spec-value {
        font-size: 1.5rem;
    }
    .cta-section {
        padding: 1.5rem;
    }
    .cta-title {
        font-size: 1.5rem;
    }
    .btn {
        width: 100%;
        max-width: 220px;
    }
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    .products-showcase {
        max-height: 95vh;
    }
    .series-nav {
        flex: 0 0 160px;
    }
}
@media (max-width: 480px) {
    .section-header h1 {
        font-size: 1.8rem;
    }
    .section-header p {
        font-size: 0.95rem;
    }
    .products-showcase {
        border-radius: var(--border-radius-md);
        max-height: 92vh;
    }
    .nav-header h2 {
        font-size: 1.4rem;
    }
    .nav-items {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 0.5rem;
        padding: 0 0.5rem;
    }
    .nav-item {
        padding: 0.6rem;
    }
    .nav-icon {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
        margin-right: 5px;
    }
    .nav-title {
        font-size: 0.8rem;
    }
    .nav-badge {
        font-size: 0.65rem;
        padding: 0.1rem 0.4rem;
    }
    .content-title {
        font-size: 1.6rem;
    }
    .highlights-section,
    .applications-grid {
        grid-template-columns: 1fr;
    }
    .application-img {
        height: 140px;
    }
    .highlights-section,
    .application-section,
    .specs-container,
    .cta-section {
        padding: 0 0.75rem;
    }
    .specs-container,
    .cta-section {
        margin-right: 0.75rem;
        width: calc(100% - 0.75rem);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.animate-fade {
    animation: fadeInUp 0.5s ease forwards;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin: 1.2rem 0;
}
.feature-tag {
    background: var(--accent);
    color: var(--dark);
    padding: 0.25rem 0.8rem;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
}
.content-title span {
    color: var(--primary);
}

.contact-popup p {
    margin: 10px 0;
    font-weight: bold;
}
.close-btn {
    margin-top: 15px;
    padding: 5px 15px;
    background: #f0f0f0;
    border: none;
    cursor: point

}