/* ===================================
   比讯科技 - 高端企业网站样式表
   BIXUN TECHNOLOGY
   =================================== */

/* CSS 变量 */
:root {
    /* 主色调 - 科技蓝 */
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: #3385ff;
    
    /* 辅助色 */
    --accent: #00d4ff;
    --accent-purple: #7c3aed;
    --accent-pink: #ec4899;
    --accent-orange: #f97316;
    --accent-green: #10b981;
    
    /* 深色主题 */
    --dark-bg: #0a0a0f;
    --dark-card: #12121a;
    --dark-border: #1e1e2a;
    --dark-elevated: #1a1a24;
    
    /* 文字 */
    --text-white: #ffffff;
    --text-light: #e4e4e7;
    --text-muted: #a1a1aa;
    --text-dark: #18181b;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #0066ff 0%, #00d4ff 100%);
    --gradient-dark: linear-gradient(180deg, #0a0a0f 0%, #12121a 100%);
    --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #0f0f1a 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.3);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器 */
    --container-max: 1400px;
    --section-padding: 7rem;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--text-white);
    overflow-x: hidden;
}

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

ul { list-style: none; }
img { max-width: 100%; height: auto; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

::selection {
    background: var(--primary);
    color: var(--text-white);
}

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===================================
   预加载动画
   =================================== */
.preloader {
    position: fixed;
    inset: 0;
    background: var(--dark-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 50px;
    height: 50px;
    border: 3px solid var(--dark-border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===================================
   按钮样式
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius);
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 50px rgba(0, 102, 255, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block { width: 100%; }

/* ===================================
   导航栏
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition);
}

.header.scrolled {
    padding: 0.75rem 0;
    background: rgba(10, 10, 15, 0.95);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-white);
}

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

.logo-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-white);
    line-height: 1.2;
}

.logo-slogan {
    font-size: 0.625rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.nav-list {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    display: block;
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-light);
    border-radius: var(--radius);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-white);
    background: rgba(255, 255, 255, 0.05);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-phone {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    color: var(--primary-light);
    font-weight: 600;
    font-size: 0.9375rem;
}

.header-phone i {
    font-size: 1rem;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-white);
    transition: all var(--transition);
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    overflow: hidden;
}

.particle-canvas {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(0, 102, 255, 0.15) 0%, transparent 70%);
}

.hero .container {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100vh;
    padding-top: 6rem;
}

.hero-content {
    max-width: 800px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.hero-tag .tag-line {
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
}

.hero-tag span {
    font-size: 0.875rem;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-white);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 2.5rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.3; transform: translateX(-50%) translateY(10px); }
}

/* ===================================
   数据条
   =================================== */
.stats-bar {
    background: var(--dark-card);
    padding: 3rem 0;
    border-top: 1px solid var(--dark-border);
    border-bottom: 1px solid var(--dark-border);
}

.stats-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 0 1rem;
}

.stat-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-white);
    flex-shrink: 0;
}

.stat-info {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-white);
    line-height: 1;
}

.stat-unit {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===================================
   区块通用样式
   =================================== */
.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.section-tag-light {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-title-light {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--text-white);
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-desc {
    font-size: 1.0625rem;
    color: var(--text-muted);
    max-width: 600px;
}

.section-desc-light {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.6);
    max-width: 600px;
}

.section-header.center {
    text-align: center;
}

.section-header.center .section-desc,
.section-header.center .section-desc-light {
    margin: 0 auto;
}

/* ===================================
   关于我们
   =================================== */
.about {
    padding: var(--section-padding) 0;
    background: var(--text-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.about-media {
    position: relative;
}

.about-image-main {
    position: relative;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: var(--primary-light);
}

.image-placeholder.small {
    aspect-ratio: 16/9;
    font-size: 3rem;
}

.image-placeholder.large {
    aspect-ratio: 3/4;
    font-size: 8rem;
}

.experience-badge {
    position: absolute;
    bottom: -2rem;
    right: -2rem;
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.exp-num {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

.exp-text {
    font-size: 0.75rem;
    line-height: 1.4;
    margin-top: 0.25rem;
}

.about-image-sub {
    position: absolute;
    bottom: -3rem;
    left: -3rem;
    width: 50%;
    box-shadow: var(--shadow-xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.about-lead {
    font-size: 1.125rem;
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-text {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.about-features {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9375rem;
    color: var(--text-dark);
}

.about-feature i {
    color: var(--accent-green);
}

/* ===================================
   服务区块
   =================================== */
.services {
    padding: var(--section-padding) 0;
    background: var(--dark-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.service-card {
    position: relative;
    background: var(--gradient-card);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all var(--transition);
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.service-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-num {
    font-size: 3rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.05);
    line-height: 1;
    margin-bottom: 1rem;
}

.service-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-white);
    margin-bottom: 1.25rem;
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 0.75rem;
}

.service-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--primary-light);
    font-weight: 500;
}

.service-link:hover {
    color: var(--text-white);
    gap: 0.75rem;
}

/* ===================================
   解决方案
   =================================== */
.solutions {
    padding: var(--section-padding) 0;
    background: var(--text-white);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.solution-card {
    background: var(--text-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

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

.solution-image {
    height: 180px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--primary-light);
}

.solution-body {
    padding: 1.5rem;
}

.solution-body h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.solution-body p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.solution-body a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 500;
}

.solution-body a:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

/* ===================================
   为什么选择我们
   =================================== */
.why-us {
    padding: var(--section-padding) 0;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

.why-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.why-lead {
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 2rem;
}

.why-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.why-item {
    display: flex;
    gap: 1.25rem;
}

.why-icon {
    width: 52px;
    height: 52px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-white);
    flex-shrink: 0;
}

.why-text h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.why-text p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.why-visual {
    position: relative;
}

.why-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.why-cards {
    position: absolute;
    bottom: -2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1rem;
}

.why-card {
    background: var(--text-white);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.why-card-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.why-card-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===================================
   成功案例
   =================================== */
.cases {
    padding: var(--section-padding) 0;
    background: var(--dark-bg);
}

.cases-filter {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.625rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--text-white);
    background: var(--primary);
    border-color: var(--primary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.case-item {
    background: var(--dark-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

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

.case-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.case-image .image-placeholder {
    height: 100%;
    border-radius: 0;
}

.case-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 102, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition);
}

.case-item:hover .case-overlay {
    opacity: 1;
}

.case-view {
    width: 50px;
    height: 50px;
    background: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.25rem;
    transform: scale(0);
    transition: transform var(--transition);
}

.case-item:hover .case-view {
    transform: scale(1);
}

.case-info {
    padding: 1.5rem;
}

.case-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--primary-light);
    background: rgba(0, 102, 255, 0.1);
    border-radius: var(--radius-full);
    margin-bottom: 0.75rem;
}

.case-info h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.case-info p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===================================
   新闻动态
   =================================== */
.news {
    padding: var(--section-padding) 0;
    background: var(--text-white);
}

.news-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 1.5rem;
    margin-top: 3rem;
}

.news-card {
    background: var(--text-white);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

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

.news-image {
    position: relative;
    height: 200px;
}

.news-card.featured .news-image {
    height: 260px;
}

.news-image .image-placeholder {
    height: 100%;
    border-radius: 0;
}

.news-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.375rem 0.875rem;
    background: var(--accent-orange);
    color: var(--text-white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.news-body {
    padding: 1.5rem;
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.news-date,
.news-cat {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.news-date i {
    margin-right: 0.25rem;
}

.news-body h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.news-body p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 500;
}

.news-link:hover {
    color: var(--primary-dark);
    gap: 0.75rem;
}

/* ===================================
   合作伙伴
   =================================== */
.partners {
    padding: 5rem 0;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    overflow: hidden;
}

.partners-marquee {
    position: relative;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.partners-track {
    display: flex;
    gap: 3rem;
    animation: marquee 30s linear infinite;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.partner-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--text-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
    transition: all var(--transition);
}

.partner-logo:hover {
    color: var(--primary);
    box-shadow: var(--shadow);
}

.partner-logo i {
    font-size: 1.5rem;
}

/* ===================================
   联系我们
   =================================== */
.contact {
    padding: var(--section-padding) 0;
    background: var(--dark-bg);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    background: var(--dark-card);
    border-radius: var(--radius-xl);
    padding: 3rem;
    border: 1px solid var(--dark-border);
}

.contact-lead {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    color: var(--text-white);
    flex-shrink: 0;
}

.contact-detail h4 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.contact-detail p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-white);
}

.contact-form-panel {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.contact-form h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    color: var(--text-white);
    transition: all var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a1a1aa' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.form-group select option {
    background: var(--dark-card);
    color: var(--text-white);
}

/* ===================================
   页脚
   =================================== */
.footer {
    background: #050508;
    padding: 5rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1.2fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin: 1rem 0 1.5rem;
}

.footer-social {
    display: flex;
    gap: 0.75rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--dark-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--text-muted);
    transition: all var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-white);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 1.25rem;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

.footer-links a:hover {
    color: var(--text-white);
}

.footer-qr h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 1rem;
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    background: var(--text-white);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--dark-bg);
    margin-bottom: 0.75rem;
}

.footer-qr p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.footer-bottom {
    border-top: 1px solid var(--dark-border);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
}

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

/* ===================================
   悬浮工具栏
   =================================== */
.float-bar {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 999;
}

.float-item {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
}

.float-item:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.float-item.back-to-top {
    background: var(--dark-card);
    border: 1px solid var(--dark-border);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

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

/* ===================================
   响应式设计
   =================================== */
@media (max-width: 1200px) {
    .services-grid,
    .solutions-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .news-card.featured {
        grid-column: span 2;
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-brand {
        grid-column: span 3;
    }
}

@media (max-width: 992px) {
    :root {
        --section-padding: 5rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .stats-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid,
    .why-grid,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .about-media {
        order: -1;
    }
    
    .about-image-sub {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-brand {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--dark-bg);
        padding: 5rem 2rem 2rem;
        transform: translateX(100%);
        transition: transform var(--transition);
    }
    
    .nav.active {
        transform: translateX(0);
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-link {
        font-size: 1.25rem;
        padding: 1rem;
    }
    
    .menu-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .header-phone span {
        display: none;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-btns {
        flex-direction: column;
    }
    
    .stats-list {
        grid-template-columns: 1fr;
    }
    
    .stat-item {
        justify-content: center;
    }
    
    .services-grid,
    .solutions-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-card.featured {
        grid-column: span 1;
    }
    
    .cases-filter {
        flex-wrap: wrap;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        grid-column: span 1;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .qr-placeholder {
        margin: 0 auto 0.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 1.875rem;
    }
    
    .section-title,
    .section-title-light {
        font-size: 1.75rem;
    }
    
    .stat-num {
        font-size: 2rem;
    }
    
    .contact-wrapper {
        padding: 1.5rem;
    }
}