/* ========================================
   北京精诚博源科技有限公司官网
   大疆风格 - 蓝白科技 · 高大上字体设计 · 贝塞尔曲线动效
   ======================================== */

/* CSS变量 */
:root {
    --color-primary: #0066ff;
    --color-secondary: #00a1ff;
    --color-accent: #0055cc;
    --color-dark: #ffffff;
    --color-darker: #f8fafc;
    --color-dark-light: #ffffff;
    --color-gray: #f1f5f9;
    --color-gray-light: #e2e8f0;
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --font-heading: "Inter", -apple-system, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    --font-body: "Inter", -apple-system, "SF Pro Text", "Microsoft YaHei", sans-serif;
    --transition-fast: 0.3s;
    --transition-normal: 0.5s;
    --transition-slow: 0.8s;
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-in-out-circ: cubic-bezier(0.85, 0, 0.15, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-dark);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========================================
   导航栏 - 极简高大上
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 24px 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: padding 0.4s var(--ease-out-expo);
}

.navbar.scrolled {
    padding: 16px 0;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo-text {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-text);
    font-family: var(--font-heading);
}

.logo-mark {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 8px;
    position: relative;
}

.logo-mark::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 3px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 48px;
}

.nav-menu a {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: var(--color-text-secondary);
    transition: all 0.3s var(--ease-out-expo);
    position: relative;
}

.nav-menu a::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.4s var(--ease-out-expo);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-text);
}

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

.contact-btn {
    padding: 12px 28px;
    background: var(--color-text);
    color: white !important;
    border-radius: 8px;
    font-weight: 600 !important;
    transition: all 0.4s var(--ease-out-expo) !important;
}

.contact-btn:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
}

.contact-btn::after {
    display: none !important;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s var(--ease-out-expo);
}

/* ========================================
   Hero 首屏 - 大气磅礴
   ======================================== */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(180deg, #ffffff 0%, var(--color-darker) 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-line {
    position: absolute;
    width: 1px;
    height: 100%;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 102, 255, 0.2) 50%, transparent 100%);
    animation: lineMove 20s linear infinite;
}

.hero-line:nth-child(1) { left: 20%; animation-delay: 0s; }
.hero-line:nth-child(2) { left: 50%; animation-delay: -7s; }
.hero-line:nth-child(3) { left: 80%; animation-delay: -14s; }

@keyframes lineMove {
    0% { transform: translateY(-100%); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(100%); opacity: 0; }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    transform: perspective(500px) rotateX(60deg);
    transform-origin: center top;
    animation: gridFloat 10s ease-in-out infinite;
}

@keyframes gridFloat {
    0%, 100% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    50% { transform: perspective(500px) rotateX(60deg) translateY(20px); }
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 0 20px;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--color-primary);
    padding: 8px 20px;
    background: rgba(0, 102, 255, 0.05);
    border-radius: 100px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.2s forwards;
}

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

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -3px;
    margin-bottom: 32px;
    font-family: var(--font-heading);
}

.hero-title .line1 {
    display: block;
    color: var(--color-text);
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.4s forwards;
}

.hero-title .line2 {
    display: block;
    color: var(--color-primary);
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.6s forwards;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 56px;
    font-weight: 400;
    letter-spacing: 0.5px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.8s forwards;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s var(--ease-out-expo) 1s forwards;
}

.btn-primary {
    padding: 18px 48px;
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    font-size: 14px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.4s var(--ease-out-expo);
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    background: var(--color-accent);
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(0, 102, 255, 0.3);
}

.btn-secondary {
    padding: 18px 48px;
    background: transparent;
    color: var(--color-text);
    font-weight: 600;
    font-size: 14px;
    border: 1px solid var(--color-gray-light);
    border-radius: 12px;
    transition: all 0.4s var(--ease-out-expo);
    letter-spacing: 0.5px;
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.scroll-indicator {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--color-text-muted);
    font-size: 10px;
    letter-spacing: 3px;
    font-weight: 500;
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out-expo) 1.2s forwards;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 1.5px solid var(--color-gray-light);
    border-radius: 12px;
    position: relative;
}

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

@keyframes scrollWheel {
    0%, 100% { 
        opacity: 1;
        top: 8px;
    }
    50% { 
        opacity: 0.3;
        top: 18px;
    }
}

/* ========================================
   通用Section样式 - 大气留白
   ======================================== */
.section {
    padding: 140px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 100px;
}

.section-tag {
    font-size: 11px;
    letter-spacing: 4px;
    color: var(--color-primary);
    display: block;
    margin-bottom: 24px;
    font-weight: 600;
}

.section-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -2px;
    color: var(--color-text);
    font-family: var(--font-heading);
}

.section-desc {
    font-size: 17px;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

[data-animate] {
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   关于我们 - 大字体设计
   ======================================== */
.about-section {
    background: var(--color-darker);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 120px;
}

.about-card {
    background: var(--color-dark-light);
    padding: 48px 36px;
    border-radius: 20px;
    text-align: left;
    border: 1px solid var(--color-gray-light);
    transition: all 0.5s var(--ease-out-expo);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 48px rgba(0, 102, 255, 0.08);
    border-color: transparent;
}

.card-num {
    font-size: 64px;
    font-weight: 800;
    color: var(--color-gray-light);
    line-height: 1;
    margin-bottom: 32px;
    font-family: var(--font-heading);
    transition: color 0.4s var(--ease-out-expo);
}

.about-card:hover .card-num {
    color: var(--color-primary);
}

.about-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.about-card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 48px;
    text-align: center;
    padding-top: 80px;
    border-top: 1px solid var(--color-gray-light);
}

.stat-item {
    position: relative;
}

.stat-number {
    font-size: 56px;
    font-weight: 800;
    color: var(--color-primary);
    display: block;
    font-family: var(--font-heading);
    letter-spacing: -2px;
}

.stat-number::after {
    content: "+";
    font-size: 36px;
    margin-left: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 12px;
    display: block;
    letter-spacing: 0.5px;
}

/* ========================================
   解决方案
   ======================================== */
.services-section {
    background: var(--color-dark);
}

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

.service-card {
    background: var(--color-dark-light);
    padding: 56px 48px;
    border-radius: 20px;
    border: 1px solid var(--color-gray-light);
    position: relative;
    overflow: hidden;
    transition: all 0.5s var(--ease-out-expo);
}

.service-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s var(--ease-out-expo);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 48px rgba(0, 102, 255, 0.06);
}

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

.service-num {
    display: block;
    font-size: 72px;
    font-weight: 800;
    color: var(--color-gray-light);
    line-height: 1;
    margin-bottom: 40px;
    font-family: var(--font-heading);
    transition: color 0.4s var(--ease-out-expo);
}

.service-card:hover .service-num {
    color: var(--color-primary);
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

.service-card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.service-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(0, 102, 255, 0.06);
    color: var(--color-primary);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
}

/* ========================================
   产品中心
   ======================================== */
.products-section {
    background: var(--color-darker);
}

.products-showcase {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
}

.product-main {
    background: var(--color-dark-light);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid var(--color-gray-light);
}

.product-image {
    height: 320px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e0efff 100%);
    position: relative;
    overflow: hidden;
}

.product-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
}

.product-lines {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
}

.product-lines span {
    width: 120px;
    height: 8px;
    background: linear-gradient(90deg, var(--color-primary), transparent);
    border-radius: 4px;
    opacity: 0.3;
}

.product-lines span:nth-child(2) {
    width: 80px;
}

.product-lines span:nth-child(3) {
    width: 40px;
}

.product-info {
    padding: 56px;
}

.product-tag {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-primary);
    color: white;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.product-info h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: -1px;
}

.product-info > p {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.product-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 40px;
}

.product-features li {
    font-size: 14px;
    color: var(--color-text-secondary);
    padding-left: 20px;
    position: relative;
}

.product-features li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
}

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

.product-item {
    display: flex;
    gap: 24px;
    align-items: center;
    background: var(--color-dark-light);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--color-gray-light);
    transition: all 0.4s var(--ease-out-expo);
    cursor: pointer;
}

.product-item:hover {
    border-color: var(--color-primary);
    transform: translateX(12px);
}

.product-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-gray-light);
    font-family: var(--font-heading);
    transition: color 0.4s var(--ease-out-expo);
}

.product-item:hover .product-num {
    color: var(--color-primary);
}

.product-item-info h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text);
}

.product-item-info p {
    font-size: 14px;
    color: var(--color-text-muted);
}

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

.featured-cases {
    display: grid;
    gap: 32px;
    margin-bottom: 80px;
}

.featured-case {
    background: linear-gradient(135deg, #f8faff 0%, #f0f5ff 100%);
    border-radius: 24px;
    padding: 64px;
    border: 1px solid var(--color-gray-light);
    position: relative;
    overflow: hidden;
    transition: all 0.5s var(--ease-out-expo);
}

.featured-case::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.featured-case:hover {
    transform: translateY(-8px);
    box-shadow: 0 32px 64px rgba(0, 102, 255, 0.08);
}

.featured-case-welfare {
    background: linear-gradient(135deg, #f8ffff 0%, #f0fff8 100%);
}

.featured-content {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 80px;
    align-items: center;
}

.featured-tag {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-primary);
    color: white;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.featured-info h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
    letter-spacing: -1px;
}

.featured-desc {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.featured-tags {
    display: flex;
    gap: 12px;
}

.featured-tags span {
    padding: 10px 24px;
    background: white;
    border-radius: 100px;
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.featured-stats {
    display: flex;
    gap: 24px;
}

.f-stat {
    flex: 1;
    text-align: center;
    padding: 32px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.f-stat-num {
    display: block;
    font-size: 40px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-family: var(--font-heading);
}

.f-stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* 更多案例 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.case-card {
    position: relative;
    min-height: 320px;
    border-radius: 20px;
    overflow: hidden;
    cursor: pointer;
    background: var(--color-dark-light);
    border: 1px solid var(--color-gray-light);
    transition: all 0.5s var(--ease-out-expo);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 48px rgba(0, 102, 255, 0.08);
}

.case-large {
    grid-column: span 2;
}

.case-num {
    position: absolute;
    top: 32px;
    left: 32px;
    font-size: 56px;
    font-weight: 800;
    color: var(--color-gray-light);
    font-family: var(--font-heading);
    transition: color 0.4s var(--ease-out-expo);
}

.case-card:hover .case-num {
    color: var(--color-primary);
}

.case-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 40px;
}

.case-industry {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-primary);
    color: white;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.case-card:nth-child(even) .case-industry {
    background: var(--color-secondary);
}

.case-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
}

.case-large .case-content h3 {
    font-size: 28px;
}

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

/* ========================================
   新闻动态
   ======================================== */
.news-section {
    background: var(--color-darker);
}

.news-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
}

.news-main {
    background: var(--color-dark-light);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--color-gray-light);
}

.news-image {
    height: 260px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-date-badge {
    position: absolute;
    bottom: 24px;
    left: 24px;
    background: white;
    padding: 20px 28px;
    border-radius: 12px;
    text-align: center;
}

.news-date-badge .day {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    font-family: var(--font-heading);
}

.news-date-badge .month {
    display: block;
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: 8px;
    letter-spacing: 1px;
}

.news-content {
    padding: 48px;
}

.news-category {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-gray);
    border-radius: 6px;
    font-size: 12px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 16px;
}

.news-content h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--color-text);
}

.news-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.news-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.news-item {
    display: flex;
    gap: 32px;
    background: var(--color-dark-light);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--color-gray-light);
    transition: all 0.4s var(--ease-out-expo);
    cursor: pointer;
}

.news-item:hover {
    border-color: var(--color-primary);
}

.news-date {
    font-size: 14px;
    color: var(--color-text-muted);
    flex-shrink: 0;
    width: 100px;
}

.news-item-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.news-item-content p {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* ========================================
   合作伙伴
   ======================================== */
.partners-section {
    background: var(--color-dark);
    padding: 100px 0;
}

.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.partner-logo {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 24px 56px;
    border: 1px solid var(--color-gray-light);
    border-radius: 12px;
    background: white;
    transition: all 0.4s var(--ease-out-expo);
    cursor: pointer;
}

.partner-logo:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 102, 255, 0.08);
}

/* ========================================
   联系我们
   ======================================== */
.contact-section {
    background: var(--color-darker);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 100px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.contact-item {
    display: flex;
    gap: 24px;
}

.contact-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--color-primary);
    margin-bottom: 8px;
    width: 80px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.contact-item p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.contact-form {
    background: var(--color-dark-light);
    padding: 64px;
    border-radius: 24px;
    border: 1px solid var(--color-gray-light);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 20px 24px;
    background: var(--color-gray);
    border: 1px solid var(--color-gray-light);
    border-radius: 12px;
    color: var(--color-text);
    font-size: 15px;
    transition: all 0.3s var(--ease-out-expo);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: white;
}

.contact-form textarea {
    resize: none;
    margin-bottom: 0;
}

.contact-form input {
    margin-bottom: 24px;
}

.btn-submit {
    width: 100%;
    border: none;
    margin-top: 24px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-text);
    padding: 100px 0 48px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 100px;
    margin-bottom: 80px;
}

.footer-brand .logo {
    margin-bottom: 24px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 28px;
    letter-spacing: 1px;
    color: white;
}

.footer-col a {
    display: block;
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    transition: color 0.3s var(--ease-out-expo);
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1200px) {
    .about-grid,
    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .case-large {
        grid-column: span 2;
    }
    
    .featured-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .featured-stats {
        justify-content: center;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .products-showcase {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .case-large {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 100px 0;
    }
    
    .section-header {
        margin-bottom: 60px;
    }
    
    .container {
        padding: 0 24px;
    }
    
    .about-grid,
    .why-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .case-large {
        grid-column: span 1;
    }
    
    .featured-case {
        padding: 40px;
    }
    
    .featured-stats {
        flex-direction: column;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 40px;
    }
    
    .product-info {
        padding: 40px;
    }
}

@media (max-width: 480px) {
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 40px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}