/* ===== SVG 图标 ===== */
.icon-sprite {
    display: none;
}

.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    vertical-align: -0.125em;
}

/* ===== 全局样式 ===== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* ===== 容器 ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 40px;
    }
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-mark {
    height: 34px;
    width: auto;
    display: block;
    flex-shrink: 0;
}

.nav-logo .logo-text {
    background: linear-gradient(135deg, #1d4ed8 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}

@media (max-width: 480px) {
    .logo-mark {
        height: 28px;
    }

    .nav-logo {
        font-size: 17px;
    }
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
    align-items: center;
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    border-radius: 8px;
    transition: all var(--transition-fast);
    font-size: 15px;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

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

.nav-link.contact-btn {
    background: var(--primary-color);
    color: white;
    margin-left: 8px;
}

.nav-link.contact-btn:hover {
    background: var(--primary-dark);
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: all var(--transition-base);
}

/* ===== 移动端导航 ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        gap: 0;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
    }

    .nav-link.contact-btn {
        margin-left: 0;
        margin-top: 8px;
    }

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

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
}

/* ===== 英雄区 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 0 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.05;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-weight: 600;
}

.hero-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    gap: 60px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-light);
    font-size: 12px;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-light);
    border-bottom: 2px solid var(--text-light);
    transform: rotate(45deg);
    margin: 8px auto 0;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* 响应式英雄区 */
@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

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

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-description {
        font-size: 14px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 36px;
    }
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

/* ===== 章节通用样式 ===== */
.section {
    padding: 80px 0;
}

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

.section-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
}

.subsection-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.subsection-title .icon {
    width: 28px;
    height: 28px;
    stroke: var(--primary-color);
    stroke-width: 2.2;
}

/* 响应式章节 */
@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .section-subtitle {
        font-size: 16px;
    }

    .subsection-title {
        font-size: 20px;
    }
}

/* ===== 选品系统专区 ===== */
.xuanping-section {
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
}

.xuanping-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 400px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    z-index: 0;
}

.xuanping-section .container {
    position: relative;
    z-index: 1;
}

.section-badge {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.xuanping-hero {
    margin-bottom: 60px;
}

.xuanping-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    align-items: center;
}

.xuanping-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.xuanping-stat {
    background: white;
    padding: 24px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    transition: all var(--transition-base);
}

.xuanping-stat:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.xuanping-stat-value {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.xuanping-stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.xuanping-preview {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.xuanping-preview img {
    width: 100%;
    height: auto;
    display: block;
}

.xuanping-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.xuanping-feature-card {
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.xuanping-feature-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.xuanping-feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 16px;
    margin-bottom: 20px;
}

.xuanping-feature-icon .icon {
    width: 32px;
    height: 32px;
    stroke: white;
    stroke-width: 2.2;
}

.xuanping-feature-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.xuanping-feature-card > p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.xuanping-feature-list {
    list-style: none;
}

.xuanping-feature-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 0;
}

.xuanping-feature-list li .icon {
    width: 14px;
    height: 14px;
    stroke: var(--primary-color);
    stroke-width: 2.5;
    flex-shrink: 0;
}

.xuanping-workflow {
    background: white;
    padding: 50px;
    border-radius: 20px;
    margin-bottom: 50px;
    box-shadow: var(--shadow-lg);
}

.xuanping-workflow h3 {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-primary);
}

.xuanping-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.xuanping-step {
    flex: 0 0 180px;
    text-align: center;
}

.xuanping-step-number {
    display: inline-block;
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    line-height: 32px;
    margin-bottom: 16px;
}

.xuanping-step-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 18px;
    margin: 0 auto 16px;
}

.xuanping-step-icon .icon {
    width: 36px;
    height: 36px;
    stroke: var(--primary-color);
    stroke-width: 2;
}

.xuanping-step h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.xuanping-step p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.xuanping-step-arrow {
    flex: 0 0 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.xuanping-step-arrow .icon {
    width: 24px;
    height: 24px;
    stroke: var(--text-light);
    stroke-width: 2;
}

.xuanping-tech {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.xuanping-tech-item {
    display: flex;
    gap: 16px;
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
}

.xuanping-tech-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 12px;
    flex-shrink: 0;
}

.xuanping-tech-icon .icon {
    width: 28px;
    height: 28px;
    stroke: var(--primary-color);
    stroke-width: 2;
}

.xuanping-tech-content h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

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

.xuanping-cta {
    text-align: center;
    background: var(--gradient-primary);
    color: white;
    padding: 50px;
    border-radius: 20px;
}

.xuanping-cta h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
}

.xuanping-cta p {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.xuanping-cta .btn {
    background: white;
    color: var(--primary-color);
}

.xuanping-cta .btn:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

/* 响应式选品系统 */
@media (max-width: 992px) {
    .xuanping-content {
        grid-template-columns: 1fr;
    }

    .xuanping-stats {
        max-width: 500px;
        margin: 0 auto;
    }

    .xuanping-steps {
        flex-direction: column;
    }

    .xuanping-step-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .xuanping-workflow {
        padding: 30px 20px;
    }

    .xuanping-workflow h3 {
        font-size: 24px;
    }

    .xuanping-features {
        grid-template-columns: 1fr;
    }

    .xuanping-cta {
        padding: 40px 24px;
    }

    .xuanping-cta h3 {
        font-size: 24px;
    }
}

/* ===== AI产品中心 ===== */
.products-section {
    background: var(--bg-secondary);
}

.featured-products {
    margin-bottom: 80px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.product-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-card.featured {
    border-top: 4px solid var(--primary-color);
}

.product-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 16px;
    margin-bottom: 20px;
    flex-shrink: 0;
}

.product-icon .icon {
    width: 36px;
    height: 36px;
    stroke: white;
    stroke-width: 2.2;
}

.product-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

.product-features {
    list-style: none;
    margin-bottom: 20px;
    flex-grow: 1;
}

.product-features li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.product-features li .icon {
    width: 16px;
    height: 16px;
    stroke: var(--primary-color);
    stroke-width: 2.5;
    flex-shrink: 0;
}

.product-image {
    margin: 20px 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.product-image img {
    width: 100%;
    height: auto;
    display: block;
}

.general-products {
    margin-bottom: 60px;
}

.products-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.custom-service {
    margin-top: 60px;
}

.custom-card {
    background: var(--gradient-primary);
    color: white;
    padding: 50px;
    border-radius: 16px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.custom-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    margin: 0 auto 20px;
}

.custom-icon .icon {
    width: 40px;
    height: 40px;
    stroke: white;
    stroke-width: 2.2;
}

.custom-card h3 {
    font-size: 28px;
    margin-bottom: 16px;
}

.custom-card p {
    font-size: 16px;
    margin-bottom: 24px;
    opacity: 0.9;
}

.custom-card ul {
    list-style: none;
    text-align: left;
    max-width: 400px;
    margin: 24px auto;
}

.custom-card li {
    padding: 10px 0;
    padding-left: 24px;
    position: relative;
}

.custom-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 响应式产品 */
@media (max-width: 768px) {
    .products-grid,
    .products-row {
        grid-template-columns: 1fr;
    }

    .custom-card {
        padding: 30px 20px;
    }

    .custom-card h3 {
        font-size: 22px;
    }
}

/* ===== 解决方案 ===== */
.solutions-section {
    background: white;
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.solution-main {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 16px;
}

.solution-main h3 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.solution-tagline {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.solution-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.solution-feature {
    display: flex;
    gap: 16px;
    background: white;
    padding: 24px;
    border-radius: 12px;
}

.feature-icon-box {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 12px;
    flex-shrink: 0;
}

.feature-icon-box .icon {
    width: 28px;
    height: 28px;
    stroke: white;
    stroke-width: 2.2;
}

.feature-content h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

.solution-modules {
    margin-top: 40px;
}

.solution-modules h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
}

.module-item {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.module-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.module-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 10px;
    margin-bottom: 8px;
}

.module-icon .icon {
    width: 24px;
    height: 24px;
    stroke: white;
    stroke-width: 2.2;
}

.module-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.solution-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.benefit-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.benefit-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.benefit-card ul {
    list-style: none;
}

.benefit-card li {
    padding: 8px 0;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    position: relative;
}

.benefit-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.cta-box {
    text-align: center;
    padding: 50px;
    background: var(--bg-secondary);
    border-radius: 16px;
}

.cta-box p {
    font-size: 20px;
    margin-bottom: 24px;
    color: var(--text-secondary);
}

/* 响应式解决方案 */
@media (max-width: 768px) {
    .solution-main {
        padding: 24px;
    }

    .solution-main h3 {
        font-size: 24px;
    }

    .solution-tagline {
        font-size: 16px;
    }

    .solution-features {
        grid-template-columns: 1fr;
    }

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

    .solution-benefits {
        grid-template-columns: 1fr;
    }

    .cta-box {
        padding: 30px 20px;
    }

    .cta-box p {
        font-size: 16px;
    }
}

/* ===== 服务章节 ===== */
.services-section {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.service-card {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 20px;
    margin: 0 auto 20px;
}

.service-icon .icon {
    width: 40px;
    height: 40px;
    stroke: white;
    stroke-width: 2.2;
}

.service-card h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

.service-note {
    background: #fff7ed;
    border-left: 4px solid #f97316;
    padding: 20px 30px;
    border-radius: 8px;
}

.service-note p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.service-note .icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    stroke: #f97316;
    stroke-width: 2.2;
    margin-right: 6px;
    vertical-align: -0.2em;
}

/* 响应式服务 */
@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 优势章节 ===== */
.advantages-section {
    background: white;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.advantage-card {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 16px;
    position: relative;
    transition: all var(--transition-base);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.advantage-number {
    font-size: 72px;
    font-weight: 800;
    color: var(--primary-color);
    opacity: 0.1;
    position: absolute;
    top: 20px;
    right: 20px;
    line-height: 1;
}

.advantage-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.advantage-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.advantage-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary-color);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.advantage-badge .icon {
    width: 14px;
    height: 14px;
    stroke: white;
    stroke-width: 2.5;
}

/* 响应式优势 */
@media (max-width: 768px) {
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 案例章节 ===== */
.cases-section {
    background: var(--bg-secondary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.case-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.case-header {
    display: flex;
    gap: 16px;
    padding: 30px;
    background: var(--gradient-primary);
    color: white;
}

.case-logo {
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.case-logo .icon {
    width: 32px;
    height: 32px;
    stroke: var(--primary-color);
    stroke-width: 2;
}

.case-info h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
}

.case-info p {
    font-size: 14px;
    opacity: 0.9;
}

.case-content {
    padding: 30px;
}

.case-challenge,
.case-solution {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.case-results {
    display: flex;
    gap: 20px;
    margin-top: 24px;
    flex-wrap: wrap;
}

.case-result {
    flex: 1;
    min-width: 100px;
    text-align: center;
}

.result-value {
    display: block;
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 6px;
}

.result-label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
}

.case-cta {
    text-align: center;
    padding: 40px;
}

.case-cta p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* 响应式案例 */
@media (max-width: 768px) {
    .cases-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 关于我们 ===== */
.about-section {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-main h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

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

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.value-item {
    text-align: center;
}

.value-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 16px;
    margin: 0 auto 16px;
}

.value-icon .icon {
    width: 32px;
    height: 32px;
    stroke: white;
    stroke-width: 2.2;
}

.value-item h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.stat-card {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
}

.stat-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 14px;
    margin: 0 auto 12px;
}

.stat-icon .icon {
    width: 28px;
    height: 28px;
    stroke: white;
    stroke-width: 2.2;
}

.stat-value {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
}

/* 响应式关于 */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 576px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 14px;
    flex-shrink: 0;
}

.contact-icon .icon {
    width: 28px;
    height: 28px;
    stroke: white;
    stroke-width: 2.2;
}

.contact-details h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-details p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 24px;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: all var(--transition-fast);
}

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

.form-group textarea {
    resize: vertical;
}

.form-note {
    text-align: center;
    font-size: 12px;
    color: var(--text-light);
    margin-top: 16px;
}

/* 响应式联系 */
@media (max-width: 992px) {
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form {
        padding: 30px 20px;
    }
}

/* ===== 页脚 ===== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-logo .logo-mark {
    height: 38px;
}

.footer-slogan {
    font-size: 14px;
    opacity: 0.8;
    line-height: 1.6;
}

.footer-company {
    font-size: 13px;
    opacity: 0.5;
    margin-top: 10px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-column li .icon {
    width: 16px;
    height: 16px;
    stroke: rgba(255, 255, 255, 0.7);
    stroke-width: 2;
    flex-shrink: 0;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.6;
}

/* 响应式页脚 */
@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ===== 工具类 ===== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

/* ===== 加载动画 ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== 打印样式 ===== */
@media print {
    .navbar,
    .hero-buttons,
    .back-to-top,
    .contact-form {
        display: none;
    }
}