/* ============================================
   睿恒信息系统 - 网站样式
   设计理念：专业、现代、简洁
   配色方案：科技蓝 + 白底 + 点缀青色
   ============================================ */

/* ============ CSS 变量 ============ */
:root {
    /* 主色系 */
    --color-primary: #1a5cc4;
    --color-primary-dark: #134a9e;
    --color-primary-light: #2b7ff0;
    --color-accent: #4fd1c5;
    --color-accent-dark: #38b2ac;

    /* 中性色 */
    --color-text: #1a202c;
    --color-text-secondary: #4a5568;
    --color-text-light: #718096;
    --color-bg: #ffffff;
    --color-bg-alt: #f7fafc;
    --color-bg-dark: #1a202c;
    --color-border: #e2e8f0;

    /* 语义色 */
    --color-success: #38a169;
    --color-danger: #e53e3e;

    /* 尺寸 */
    --header-height: 72px;
    --container-max: 1200px;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* 过渡 */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.2s ease;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
}

/* ============ 重置 ============ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-primary-dark);
}

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ============ 布局容器 ============ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ 通用组件 ============ */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============ 按钮 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(26, 92, 196, 0.35);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
    color: #fff;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

/* ============ 头部导航 ============ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 24px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-icon {
    display: flex;
    align-items: center;
}

.logo-icon img {
    display: block;
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text strong {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-text);
}

.logo-text small {
    font-size: 12px;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
}

/* 导航列表 */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-list > li {
    position: relative;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(26, 92, 196, 0.06);
}

/* 下拉菜单 */
.has-dropdown > .nav-link::after {
    content: "";
    display: inline-block;
    margin-left: 6px;
    width: 6px;
    height: 6px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
}

.has-dropdown:hover > .nav-link::after {
    transform: rotate(225deg);
}

.dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    min-width: 200px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 100;
}

.has-dropdown:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown li a {
    display: block;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown li a:hover {
    background: rgba(26, 92, 196, 0.06);
    color: var(--color-primary);
}

/* 头部联系按钮 */
.header-contact {
    flex-shrink: 0;
}

.phone-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.phone-btn:hover {
    background: var(--color-primary);
    color: #fff;
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    z-index: 1100;
}

.menu-toggle span {
    width: 26px;
    height: 3px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ============ 移动端导航 ============ */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 1050;
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100dvh;
    background: #fff;
    padding: var(--header-height) 0 24px;
    transition: right var(--transition);
    z-index: 1060;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
}

.mobile-nav-list li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-list li a {
    display: block;
    padding: 16px 24px;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.mobile-nav-list li a:hover,
.mobile-nav-list li a.active {
    background: rgba(26, 92, 196, 0.06);
    color: var(--color-primary);
    padding-left: 28px;
}

.mobile-contact-btn {
    background: var(--color-primary);
    color: #fff !important;
    text-align: center;
    margin: 16px 24px;
    border-radius: var(--radius-sm);
    border: none !important;
}

/* ============ Hero 区域 ============ */
.hero {
    position: relative;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    /* 纯色兜底防止图片加载前闪白 */
    background: #0a2540;
    overflow: hidden;
    /* 固定为最底层，隔离内部伪元素的高 z-index，避免盖住按钮 */
    z-index: 0;
}

/* 三张主题背景图轮播：AI服务器 / 超融合虚拟化 / IT维保服务 */
.hero-slide {
    position: absolute;
    inset: 0;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    opacity: 0;
    /* 21s 完整循环：每张主导约 7s，交叉淡入淡出 + Ken Burns 缓慢推近 */
    animation: heroSlideShow 21s linear infinite;
    will-change: opacity, transform;
    z-index: 1;
}

.hero-slide-1 {
    background-image: url("/assets/images/hero-ai.jpg");
    animation-delay: 0s;
}

.hero-slide-2 {
    background-image: url("/assets/images/hero-hci.jpg");
    animation-delay: -7s;
}

.hero-slide-3 {
    background-image: url("/assets/images/hero-ops.jpg");
    animation-delay: -14s;
}

@keyframes heroSlideShow {
    0% {
        opacity: 0;
        transform: scale(1.04);
    }
    4.8% {
        opacity: 1;
    }
    30% {
        opacity: 1;
        transform: scale(1.12);
    }
    36% {
        opacity: 0;
        transform: scale(1.14);
    }
    100% {
        opacity: 0;
        transform: scale(1.14);
    }
}

.hero-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 2;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(79, 209, 197, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(43, 127, 240, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 60% 80%, rgba(99, 179, 237, 0.1) 0%, transparent 50%);
}

.hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 3;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    /* 左侧暗化保证标题白字可读 + 上下暗角增强层次 */
    background:
        linear-gradient(90deg, rgba(10, 37, 64, 0.55) 0%, rgba(10, 37, 64, 0.2) 50%, rgba(10, 37, 64, 0) 80%),
        linear-gradient(to bottom, rgba(10, 37, 64, 0.35) 0%, transparent 45%, rgba(10, 37, 64, 0.55) 100%);
    /* 遮罩只做视觉，不拦截鼠标事件，保证按钮可点 */
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-text {
    max-width: 680px;
    color: #fff;
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 24px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 36px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.6);
    animation: bounce 2s infinite;
    z-index: 3;
}

.scroll-indicator:hover {
    color: #fff;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

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

/* ============ 核心优势 ============ */
.advantages {
    padding: 80px 0;
    background: var(--color-bg);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    text-align: center;
    padding: 36px 24px;
    border-radius: var(--radius-md);
    background: var(--color-bg-alt);
    transition: all var(--transition);
    border: 1px solid transparent;
}

.advantage-card:hover {
    background: #fff;
    border-color: var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.adv-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(26, 92, 196, 0.08);
    color: var(--color-primary);
    margin-bottom: 20px;
    transition: all var(--transition);
}

.advantage-card:hover .adv-icon {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.05);
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.adv-tags {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-primary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============ 产品介绍 ============ */
.products {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: rgba(26, 92, 196, 0.2);
}

.product-img {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.product-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: transform var(--transition);
}

.product-card:hover .product-img-placeholder {
    transform: scale(1.08);
}

.server-bg { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.dell-bg { background: linear-gradient(135deg, #0a2540 0%, #1a5cc4 100%); }
.storage-bg { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }
.vdi-bg { background: linear-gradient(135deg, #fc466b 0%, #3f5efb 100%); }
.cloud-bg { background: linear-gradient(135deg, #0093E9 0%, #80D0C7 100%); }
.tencent-bg { background: linear-gradient(135deg, #006eff 0%, #00b8ff 100%); }

.product-body {
    padding: 24px;
}

.product-body h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
    line-height: 1.5;
}

.product-body p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: rgba(26, 92, 196, 0.08);
    border-radius: 20px;
}

.product-detail-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 12px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition-fast), color var(--transition-fast);
}

.product-detail-link:hover {
    color: var(--color-primary-dark);
    gap: 8px;
}

/* ============ 解决方案 ============ */
.solutions {
    padding: 80px 0;
    background: #fff;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-item {
    display: flex;
    gap: 20px;
    padding: 28px;
    border-radius: var(--radius-md);
    background: var(--color-bg-alt);
    transition: all var(--transition);
}

.solution-item:hover {
    background: #fff;
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.solution-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.solution-item:hover .solution-icon {
    background: var(--color-accent);
    transform: rotate(-5deg) scale(1.05);
}

.solution-content h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}

.solution-content p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============ 关于我们 ============ */
.about {
    padding: 80px 0;
    background: linear-gradient(135deg, #0a2540 0%, #134a9e 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.about::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 10% 50%, rgba(79, 209, 197, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 30%, rgba(43, 127, 240, 0.15) 0%, transparent 40%);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 32px 20px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: all var(--transition);
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-4px);
}

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 900;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-plus {
    font-size: 28px;
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.about-content .section-tag {
    color: var(--color-accent);
}

.about-content .section-title {
    color: #fff;
}

.about-text {
    font-size: 15px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 16px;
}

.about-text strong {
    color: var(--color-accent);
}

.about-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.about-tag {
    display: inline-block;
    padding: 6px 16px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    background: rgba(79, 209, 197, 0.15);
    border: 1px solid rgba(79, 209, 197, 0.3);
    border-radius: 20px;
}

/* ============ 服务中心 ============ */
.service {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: #fff;
    padding: 36px 24px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.service-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(26, 92, 196, 0.2);
}

.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============ 新闻资讯 ============ */
.news {
    padding: 80px 0;
    background: #fff;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    padding: 28px;
    border-radius: var(--radius-md);
    background: var(--color-bg-alt);
    transition: all var(--transition);
    border: 1px solid var(--color-border);
}

.news-card:hover {
    background: #fff;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(26, 92, 196, 0.15);
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.news-date {
    font-size: 13px;
    color: var(--color-text-light);
    font-weight: 500;
}

.news-category {
    display: inline-block;
    padding: 3px 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: rgba(26, 92, 196, 0.08);
    border-radius: 12px;
}

.news-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 12px;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
}

.news-link:hover {
    color: var(--color-primary-dark);
}

/* ============ 联系我们 ============ */
.contact {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

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

.contact-info .section-tag,
.contact-info .section-title,
.contact-info .section-desc {
    text-align: left;
}

.contact-info .section-desc {
    margin-left: 0;
    margin-bottom: 32px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-item-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

/* 留言表单 */
.contact-form-wrapper {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.contact-form h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--color-text);
}

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

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(26, 92, 196, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-note {
    margin-top: 16px;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

.form-note.success {
    color: var(--color-success);
}

.form-note.error {
    color: var(--color-danger);
}

/* ============ 页脚 ============ */
.site-footer {
    background: var(--color-bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo .logo-text strong {
    color: #fff;
    font-size: 18px;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a,
.footer-col ul li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

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

.footer-bottom a:hover {
    color: var(--color-accent);
}

/* ============ 浮动工具栏 ============ */
.float-tools {
    position: fixed;
    right: 20px;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 900;
}

.float-tool {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.float-tool:hover {
    background: var(--color-primary-dark);
    transform: scale(1.1);
}

.float-tool svg {
    flex-shrink: 0;
}

.float-label {
    position: absolute;
    right: 100%;
    margin-right: 12px;
    white-space: nowrap;
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 600;
    background: var(--color-text);
    color: #fff;
    border-radius: var(--radius-sm);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    pointer-events: none;
}

.float-tool:hover .float-label {
    opacity: 1;
    visibility: visible;
    transform: translateX(-4px);
}

#backToTop {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    background: var(--color-accent-dark);
}

#backToTop.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

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

/* ============ 响应式：平板 ============ */
@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

/* ============ 响应式：手机 ============ */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    /* 隐藏桌面导航 */
    .main-nav,
    .header-contact {
        display: none;
    }

    /* 显示汉堡菜单 */
    .menu-toggle {
        display: flex;
    }

    /* 通用间距调整 */
    .section-header {
        margin-bottom: 40px;
    }

    .container {
        padding: 0 16px;
    }

    /* Hero 调整 */
    .hero {
        min-height: 90dvh;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .scroll-indicator {
        display: none;
    }

    /* 优势区 */
    .advantages {
        padding: 48px 0;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .advantage-card {
        padding: 28px 20px;
    }

    /* 产品区 */
    .products {
        padding: 48px 0;
    }

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

    /* 解决方案 */
    .solutions {
        padding: 48px 0;
    }

    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .solution-item {
        padding: 20px;
    }

    /* 关于我们 */
    .about {
        padding: 48px 0;
    }

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

    .about-stats {
        gap: 16px;
    }

    .stat-item {
        padding: 24px 16px;
    }

    .stat-number {
        font-size: 32px;
    }

    /* 服务中心 */
    .service {
        padding: 48px 0;
    }

    .service-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    /* 新闻 */
    .news {
        padding: 48px 0;
    }

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

    /* 联系我们 */
    .contact {
        padding: 48px 0;
    }

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

    .contact-form-wrapper {
        padding: 24px;
    }

    /* 页脚 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        padding-bottom: 32px;
    }

    /* 浮动工具栏 */
    .float-tools {
        right: 12px;
        bottom: 24px;
    }

    .float-tool {
        width: 46px;
        height: 46px;
    }

    .float-label {
        display: none;
    }
}

/* ============ 小屏手机 ============ */
@media (max-width: 380px) {
    .hero-title {
        font-size: 26px;
    }

    .section-title {
        font-size: 24px;
    }
}

/* ============ 打印样式 ============ */
@media print {
    .site-header,
    .float-tools,
    .menu-toggle,
    .mobile-nav,
    .mobile-nav-overlay,
    .scroll-indicator {
        display: none !important;
    }

    .hero {
        min-height: auto;
        color: #000;
    }

    .hero-bg,
    .hero-overlay {
        display: none;
    }
}

/* ============ 无障碍：焦点样式 ============ */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ============ 无障碍：减少动画 ============ */
@media (prefers-reduced-motion: reduce) {
    /* 轮播动画禁用时默认显示第一张（AI服务器），避免三张全部隐形 */
    .hero-slide {
        animation: none;
    }

    .hero-slide-1 {
        opacity: 1;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}