/* ==========================================
   四川天府高驰信息技术有限公司 - 企业官网样式表
   党建红 + 藏区元素风格
   ========================================== */

/* CSS Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 党建红主色调 */
    --primary-color: #c41230;
    --primary-dark: #a01027;
    --primary-light: #ffe6e9;
    --primary-hover: #e01535;
    
    /* 金色辅助色（国企庄重） */
    --gold-color: #d4a84b;
    --gold-light: #f5e6c8;
    
    /* 藏区元素色 */
    --tibet-blue: #1e5c8b;
    --tibet-green: #2d8a6e;
    --tibet-sky: #5ba3c9;
    
    /* 文本色 */
    --text-dark: #333333;
    --text-gray: #666666;
    --text-light: #999999;
    
    /* 背景色 */
    --bg-white: #ffffff;
    --bg-light: #fff9f9;
    --bg-cream: #faf8f5;
    
    /* 渐变背景 */
    --bg-gradient: linear-gradient(135deg, #c41230 0%, #e01535 50%, #c41230 100%);
    --gold-gradient: linear-gradient(135deg, #d4a84b 0%, #f5d78e 50%, #d4a84b 100%);
    
    /* 阴影 */
    --shadow-light: 0 2px 10px rgba(196, 18, 48, 0.1);
    --shadow-medium: 0 5px 20px rgba(196, 18, 48, 0.15);
    --shadow-heavy: 0 10px 40px rgba(196, 18, 48, 0.2);
    
    /* 圆角 */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    
    /* 过渡 */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ==========================================
   Header & Navigation
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 1);
    box-shadow: var(--shadow-medium);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--bg-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 18px;
    position: relative;
}

.logo-icon::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border: 2px solid var(--gold-color);
    border-radius: calc(var(--border-radius) + 2px);
    opacity: 0.5;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.logo-text span {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-gray);
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-list {
    display: flex;
    gap: 32px;
}

.nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--bg-gradient);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

.nav-btn {
    background: var(--bg-gradient);
    color: white;
    padding: 10px 24px;
    border-radius: 25px;
    font-weight: 500;
    font-size: 14px;
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '★';
    position: absolute;
    left: 10px;
    color: var(--gold-color);
    font-size: 10px;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==========================================
   Hero Banner / Carousel
   ========================================== */
.hero {
    position: relative;
    margin-top: 80px;
    height: 600px;
    overflow: hidden;
}

.banner-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

/* 藏区元素渐变背景 */
.banner-slide-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(196, 18, 48, 0.9) 0%, rgba(196, 18, 48, 0.7) 50%, rgba(30, 92, 139, 0.6) 100%);
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 140px 20px;
    color: white;
}

.banner-tag {
    display: inline-block;
    background: rgba(212, 168, 75, 0.3);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 20px;
    border: 1px solid rgba(212, 168, 75, 0.5);
}

.banner-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
    max-width: 700px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-subtitle {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 30px;
    max-width: 600px;
}

.banner-btn {
    display: inline-block;
    background: var(--gold-gradient);
    color: var(--primary-dark);
    padding: 14px 36px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.banner-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Banner Navigation */
.banner-nav {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.banner-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition);
}

.banner-dot.active {
    background: var(--gold-color);
    transform: scale(1.2);
}

.banner-arrows {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 10;
}

.banner-arrow {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 20px;
    border: 2px solid rgba(212, 168, 75, 0.5);
}

.banner-arrow:hover {
    background: rgba(196, 18, 48, 0.8);
}

/* ==========================================
   Section Common Styles
   ========================================== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary-color);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
    border: 1px solid rgba(196, 18, 48, 0.2);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--bg-gradient);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 20px auto 0;
}

.bg-light {
    background: var(--bg-light);
}

.bg-cream {
    background: var(--bg-cream);
}

/* ==========================================
   About Section
   ========================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
}

.about-image-main {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, #c41230 0%, #1e5c8b 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 80px;
    position: relative;
}

.about-image-main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L60 30L30 60L0 30Z' fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.1'/%3E%3C/svg%3E");
    opacity: 0.3;
}

.about-stats {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    gap: 20px;
}

.about-stat {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-medium);
    border-top: 3px solid var(--primary-color);
}

.about-stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.about-stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

.about-text h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--text-dark);
    position: relative;
    padding-left: 20px;
}

.about-text h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 4px;
    background: var(--bg-gradient);
    border-radius: 2px;
}

.about-text p {
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 30px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
    font-size: 15px;
}

.about-feature-icon {
    width: 24px;
    height: 24px;
    background: var(--gold-gradient);
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

/* ==========================================
   Products Section
   ========================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.product-card {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.product-image {
    height: 200px;
    background: linear-gradient(135deg, #c41230 0%, #1e5c8b 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 60px;
    position: relative;
}

.product-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gold-gradient);
}

.product-content {
    padding: 30px;
}

.product-tag {
    display: inline-block;
    background: var(--gold-light);
    color: var(--primary-dark);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 12px;
    border: 1px solid rgba(212, 168, 75, 0.3);
}

.product-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.product-desc {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 15px;
}

.product-link:hover {
    gap: 12px;
}

/* ==========================================
   Advantages Section
   ========================================== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-card {
    text-align: center;
    padding: 40px 30px;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-bottom-color: var(--primary-color);
}

.advantage-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 36px;
    position: relative;
}

.advantage-icon::after {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 2px solid var(--gold-color);
    border-radius: 50%;
    opacity: 0.5;
}

.advantage-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.advantage-desc {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
}

/* ==========================================
   Honors Section
   ========================================== */
.honors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.honor-card {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 2px solid var(--primary-light);
}

.honor-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.honor-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: var(--gold-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-dark);
    font-size: 28px;
}

.honor-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

/* ==========================================
   News Section
   ========================================== */
.news-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

.news-main {
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.news-main:hover {
    box-shadow: var(--shadow-medium);
}

.news-main-image {
    height: 280px;
    background: linear-gradient(135deg, #c41230 0%, #1e5c8b 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 60px;
    position: relative;
}

.news-main-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M50 0L100 50L50 100L0 50Z' fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.1'/%3E%3C/svg%3E");
}

.news-main-content {
    padding: 30px;
}

.news-main-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.news-main-desc {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    color: var(--text-light);
    font-size: 14px;
}

.news-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border-left: 3px solid var(--gold-color);
}

.news-item:hover {
    box-shadow: var(--shadow-medium);
}

.news-item-image {
    width: 100px;
    height: 80px;
    background: linear-gradient(135deg, #c41230 0%, #1e5c8b 100%);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    flex-shrink: 0;
}

.news-item-content {
    flex: 1;
}

.news-item-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-dark);
    line-height: 1.4;
}

.news-item-date {
    color: var(--text-light);
    font-size: 13px;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    padding: 40px;
    background: var(--bg-gradient);
    border-radius: var(--border-radius-lg);
    color: white;
    position: relative;
    overflow: hidden;
}

.contact-info::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(212, 168, 75, 0.2) 0%, transparent 70%);
}

.contact-info h3 {
    font-size: 28px;
    margin-bottom: 30px;
    position: relative;
}

.contact-info h3::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--gold-color);
    border-radius: 2px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    position: relative;
}

.contact-item-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
    border: 1px solid rgba(212, 168, 75, 0.3);
}

.contact-item-content h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.contact-item-content p {
    opacity: 0.9;
    font-size: 15px;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
    border-top: 4px solid var(--primary-color);
}

.form-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 30px;
    color: var(--text-dark);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-label::before {
    content: '★ ';
    color: var(--primary-color);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 15px;
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(196, 18, 48, 0.1);
}

.form-textarea {
    height: 120px;
    resize: vertical;
}

.form-btn {
    width: 100%;
    padding: 16px;
    background: var(--bg-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.form-btn::before {
    content: '★';
    position: absolute;
    left: 20px;
    color: var(--gold-color);
}

.form-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: linear-gradient(135deg, #1a1a2e 0%, #2d1f1f 100%);
    color: white;
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(196, 18, 48, 0.3);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo-icon {
    width: 45px;
    height: 45px;
    background: var(--bg-gradient);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 18px;
    position: relative;
}

.footer-logo-icon::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border: 2px solid var(--gold-color);
    border-radius: calc(var(--border-radius) + 2px);
    opacity: 0.5;
}

.footer-logo-text {
    font-size: 20px;
    font-weight: 700;
    color: white;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    line-height: 1.7;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--gold-color);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--gold-color);
    padding-left: 5px;
}

.footer-contact-item {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
}

.footer-contact-icon {
    color: var(--gold-color);
}

.footer-bottom {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal a:hover {
    color: var(--gold-color);
}

/* ==========================================
   Back to Top
   ========================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--bg-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    z-index: 999;
    border: 2px solid var(--gold-color);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .hero {
        height: 500px;
    }
    
    .banner-title {
        font-size: 36px;
    }
    
    .banner-subtitle {
        font-size: 18px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header .container {
        height: 70px;
    }
    
    .nav-list {
        display: none;
    }
    
    .nav-btn {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        margin-top: 70px;
        height: 450px;
    }
    
    .banner-content {
        padding: 100px 20px;
    }
    
    .banner-title {
        font-size: 28px;
    }
    
    .banner-subtitle {
        font-size: 16px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .honors-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-wrap: wrap;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 24px;
    }
    
    .banner-btn {
        padding: 12px 28px;
        font-size: 14px;
    }
    
    .honors-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info,
    .contact-form {
        padding: 30px 20px;
    }
}