/* 
 * AaaS接口即服务计费平台 - 样式表
 * 包含全局样式、组件样式和响应式设计
 */

/* ===== 全局样式 ===== */
:root {
    /* 主色调 */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --primary-light: #e1f0fa;
    --primary-ultra-light: #f5faff;
    --secondary-color: #2ecc71;
    --secondary-dark: #27ae60;
    --secondary-light: #e8f8f0;
    
    /* 中性色 */
    --dark-color: #2c3e50;
    --text-color: #333333;
    --light-text: #7f8c8d;
    --light-bg: #f9f9f9;
    --white: #ffffff;
    
    /* 强调色 */
    --accent-color: #e74c3c;
    --accent-dark: #c0392b;
    --accent-light: #fdf1f0;
    
    /* 辅助色 */
    --purple-color: #9b59b6;
    --purple-light: #f4ebf9;
    --yellow-color: #f1c40f;
    --yellow-light: #fef9e7;
    --teal-color: #1abc9c;
    --teal-light: #e8f8f5;
    
    /* 字体 */
    --body-font: 'Helvetica Neue', Arial, sans-serif;
    --heading-font: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* 间距 */
    --section-padding: 80px 0;
    --container-padding: 0 15px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--body-font);
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--dark-color);
}

p {
    margin-bottom: 15px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 4px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
}

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

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

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

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

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
    transition: all 0.3s ease;
}

.header.scrolled {
    padding: 10px 0;
}

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

.logo h1 {
    font-size: 1.8rem;
    margin: 0;
    color: var(--black-color);
}

.nav ul {
    display: flex;
}

.nav ul li {
    margin-left: 30px;
}

.nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
    position: relative;
}

.nav ul li a:hover {
    color: var(--primary-color);
}

.nav ul li a:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav ul li a:hover:after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    margin-bottom: 5px;
    border-radius: 3px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle span:last-child {
    margin-bottom: 0;
}

/* ===== 主横幅 ===== */
.hero {
    padding-top: 150px;
    padding-bottom: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--yellow-color));
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
    opacity: 0.3;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero h2 {
    font-size: 3.5rem;
    color: var(--white);
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero .subtitle {
    font-size: 1.8rem;
    margin-bottom: 25px;
    font-weight: 300;
}

.hero .description {
    font-size: 1.2rem;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ===== 核心功能 ===== */
.features {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--primary-ultra-light), var(--secondary-light));
    position: relative;
    overflow: hidden;
}

.features:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M54.627 0l.83.828-1.415 1.415L51.8 0h2.827zM5.373 0l-.83.828L5.96 2.243 8.2 0H5.374zM48.97 0l3.657 3.657-1.414 1.414L46.143 0h2.828zM11.03 0L7.372 3.657 8.787 5.07 13.857 0H11.03zm32.284 0L49.8 6.485 48.384 7.9l-7.9-7.9h2.83zM16.686 0L10.2 6.485 11.616 7.9l7.9-7.9h-2.83zM22.343 0L13.857 8.485 15.272 9.9l9.9-9.9h-2.83zM32 0l-3.486 3.485 1.415 1.415L34.828.828 32 0zm-6.485 0L16.828 8.687l1.414 1.414 10.485-10.485L25.515 0zm12.97 0l8.485 8.485-1.414 1.415L34.828 0h2.83zM20.344 0L0 20.344l1.414 1.414L30.03 0h-9.686z' fill='%233498db' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.feature-item {
    background-color: var(--white);
    border-radius: 12px;
    padding: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.1);
    border: 1px solid rgba(52, 152, 219, 0.1);
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(52, 152, 219, 0.15);
    border-color: rgba(52, 152, 219, 0.2);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
    box-shadow: 0 10px 20px rgba(52, 152, 219, 0.2);
}

.feature-icon:before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    z-index: -1;
    opacity: 0.3;
}

.feature-icon i {
    font-size: 30px;
    color: var(--white);
}

.feature-content h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.feature-content p {
    color: var(--light-text);
}

/* ===== 商业价值 ===== */
.benefits {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--dark-color), var(--primary-dark));
    position: relative;
    color: var(--white);
    overflow: hidden;
}

.benefits:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M50 50c0-5.523 4.477-10 10-10s10 4.477 10 10-4.477 10-10 10c0 5.523-4.477 10-10 10s-10-4.477-10-10 4.477-10 10-10zM10 10c0-5.523 4.477-10 10-10s10 4.477 10 10-4.477 10-10 10c0 5.523-4.477 10-10 10S0 25.523 0 20s4.477-10 10-10zm10 8c4.418 0 8-3.582 8-8s-3.582-8-8-8-8 3.582-8 8 3.582 8 8 8zm40 40c4.418 0 8-3.582 8-8s-3.582-8-8-8-8 3.582-8 8 3.582 8 8 8z' /%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.benefits .section-title {
    color: var(--white);
    position: relative;
    z-index: 1;
}

.benefits .section-title:after {
    background-color: var(--secondary-color);
}

.benefits-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.benefit-item {
    text-align: center;
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
}

.benefit-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.15);
}

.benefit-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    position: relative;
}

.benefit-icon:before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    z-index: -1;
    opacity: 0.5;
}

.benefit-icon i {
    font-size: 35px;
    color: var(--white);
}

.benefit-item h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--white);
}

.benefit-item p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

/* ===== 解决方案演示 ===== */
.demo {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--teal-light), var(--primary-ultra-light));
    position: relative;
    overflow: hidden;
}

.demo:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3z' fill='%231abc9c' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
    opacity: 0.5;
}

.demo-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    padding-bottom: 10px;
    position: relative;
    z-index: 1;
}

.demo-tab {
    padding: 12px 25px;
    margin: 0 10px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    background: rgba(255, 255, 255, 0.7);
    color: var(--text-color);
    position: relative;
    transition: all 0.3s ease;
    border-radius: 30px;
    box-shadow: 0 5px 15px rgba(26, 188, 156, 0.1);
}

.demo-tab:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(26, 188, 156, 0.15);
}

.demo-tab.active {
    color: var(--white);
    background: linear-gradient(135deg, var(--teal-color), var(--primary-color));
    box-shadow: 0 8px 20px rgba(26, 188, 156, 0.2);
}

.demo-panes {
    position: relative;
    z-index: 1;
}

.demo-pane {
    display: none;
    opacity: 0;
    transition: all 0.5s ease;
    transform: translateY(20px);
}

.demo-pane.active {
    display: flex;
    opacity: 1;
    flex-wrap: wrap;
    transform: translateY(0);
}

.demo-image {
    flex: 1;
    min-width: 300px;
    padding: 20px;
}

.demo-img {
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    width: 100%;
    border: 5px solid var(--white);
    transition: all 0.3s ease;
}

.demo-pane.active:hover .demo-img {
    transform: scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.demo-description {
    flex: 1;
    min-width: 300px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.demo-description h3 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    background: linear-gradient(135deg, var(--teal-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.demo-description p {
    margin-bottom: 15px;
    font-size: 1.1rem;
    position: relative;
    padding-left: 25px;
}

.demo-description p:before {
    content: '•';
    position: absolute;
    left: 5px;
    top: 0;
    color: var(--teal-color);
    font-size: 1.5rem;
    line-height: 1;
}

/* ===== 实施流程 ===== */
.implementation {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--purple-light), var(--primary-ultra-light));
    position: relative;
    overflow: hidden;
}

.implementation:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='70' height='70' viewBox='0 0 70 70' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239b59b6' fill-opacity='0.05' fill-rule='evenodd'%3E%3Cpath d='M0 0h35v35H0V0zm5 5h25v25H5V5zm5 5h15v15H10V10zm5 5h5v5h-5v-5zM40 5h25v25H40V5zm5 5h15v15H45V10zm5 5h5v5h-5v-5zM70 35H35v35h35V35zm-5 5H40v25h25V40zm-5 5H45v15h15V45zm-5 5h-5v5h5v-5z'/%3E%3C/g%3E%3C/svg%3E");
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    z-index: 1;
}

.timeline:before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--purple-color));
    border-radius: 2px;
    box-shadow: 0 0 20px rgba(155, 89, 182, 0.3);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    perspective: 1000px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    border: 4px solid var(--white);
    z-index: 2;
    box-shadow: 0 0 15px rgba(155, 89, 182, 0.4);
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
    transform: translateX(-50%) scale(1.2);
    box-shadow: 0 0 20px rgba(155, 89, 182, 0.6);
}

.timeline-content {
    position: relative;
    width: calc(50% - 40px);
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(155, 89, 182, 0.1);
    backdrop-filter: blur(5px);
}

.timeline-item:hover .timeline-content {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: rgba(155, 89, 182, 0.2);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: auto;
    transform-origin: left center;
}

.timeline-item:nth-child(even) .timeline-content {
    transform-origin: right center;
}

.timeline-item:nth-child(odd) .timeline-content:before,
.timeline-item:nth-child(even) .timeline-content:before {
    content: '';
    position: absolute;
    top: 15px;
    width: 20px;
    height: 20px;
    background: inherit;
    border-radius: 2px;
    transform: rotate(45deg);
    z-index: -1;
    border: 1px solid rgba(155, 89, 182, 0.1);
}

.timeline-item:nth-child(odd) .timeline-content:before {
    left: -10px;
    border-right: none;
    border-top: none;
}

.timeline-item:nth-child(even) .timeline-content:before {
    right: -10px;
    border-left: none;
    border-bottom: none;
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.timeline-content p {
    color: var(--text-color);
    line-height: 1.8;
    position: relative;
    padding-left: 20px;
}

.timeline-content p:before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    background: var(--purple-color);
    border-radius: 50%;
}

/* ===== 成功案例 ===== */
.cases {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--yellow-light), var(--secondary-light));
    position: relative;
    overflow: hidden;
}

.cases:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f1c40f' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.case-item {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(241, 196, 15, 0.1);
    position: relative;
}

.case-item:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--yellow-color), var(--secondary-color));
}

.case-item:hover {
    transform: translateY(-15px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    border-color: rgba(241, 196, 15, 0.3);
}

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

.case-image:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30%;
    background: linear-gradient(to top, rgba(0,0,0,0.3), rgba(0,0,0,0));
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.case-item:hover .case-image img {
    transform: scale(1.1);
}

.case-content {
    padding: 30px;
    position: relative;
}

.case-content h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--yellow-color), var(--yellow-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.case-description {
    color: var(--text-color);
    margin-bottom: 20px;
    line-height: 1.7;
}

.case-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
    background: rgba(241, 196, 15, 0.05);
    padding: 15px 20px;
    border-radius: 8px;
    border: 1px solid rgba(241, 196, 15, 0.1);
}

.case-highlights li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
    color: var(--text-color);
}

.case-highlights li:last-child {
    margin-bottom: 0;
}

.case-highlights li:before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ===== 联系我们 ===== */
.contact {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--primary-ultra-light), var(--purple-light));
    position: relative;
    overflow: hidden;
}

.contact:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='84' height='48' viewBox='0 0 84 48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h12v6H0V0zm28 8h12v6H28V8zm14-8h12v6H42V0zm14 0h12v6H56V0zm0 8h12v6H56V8zM42 8h12v6H42V8zm0 16h12v6H42v-6zm14-8h12v6H56v-6zm14 0h12v6H70v-6zm0-16h12v6H70V0zM28 32h12v6H28v-6zM14 16h12v6H14v-6zM0 24h12v6H0v-6zm0 8h12v6H0v-6zm14 0h12v6H14v-6zm14 8h12v6H28v-6zm-14 0h12v6H14v-6zm28 0h12v6H42v-6zm14-8h12v6H56v-6zm0-8h12v6H56v-6zm14 8h12v6H70v-6zm0 8h12v6H70v-6zM14 24h12v6H14v-6zm14-8h12v6H28v-6zM14 8h12v6H14V8zM0 8h12v6H0V8z' fill='%233498db' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
}

.contact-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 30px;
    position: relative;
    z-index: 1;
}

.contact-info {
    flex: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.contact-card {
    flex: 1;
    min-width: 250px;
    background: rgba(255, 255, 255, 0.95);
    padding: 35px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(52, 152, 219, 0.1);
    backdrop-filter: blur(5px);
    position: relative;
    overflow: hidden;
}

.contact-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--purple-color));
}

.contact-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    border-color: rgba(52, 152, 219, 0.2);
}

.contact-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    box-shadow: 0 10px 20px rgba(52, 152, 219, 0.2);
    position: relative;
}

.contact-icon:before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    background: linear-gradient(45deg, var(--primary-color), var(--purple-color));
    border-radius: 50%;
    z-index: -1;
    opacity: 0.3;
}

.contact-icon i {
    font-size: 32px;
    color: var(--white);
}

.contact-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.contact-card p {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.contact-qrcode {
    flex: 1;
    min-width: 250px;
    background: rgba(255, 255, 255, 0.95);
    padding: 35px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(52, 152, 219, 0.1);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.contact-qrcode:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--purple-color));
}

.contact-qrcode:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    border-color: rgba(52, 152, 219, 0.2);
}

.contact-qrcode img {
    max-width: 200px;
    margin: 0 auto 20px;
    border: 5px solid var(--white);
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.contact-qrcode:hover img {
    transform: scale(1.05);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.contact-qrcode h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.contact-qrcode p {
    color: var(--text-color);
    font-size: 1.05rem;
}

/* ===== 页脚 ===== */
.footer {
    background: linear-gradient(135deg, var(--dark-color), #1a1a2e);
    color: var(--white);
    padding: 60px 0 20px;
    position: relative;
    overflow: hidden;
}

.footer:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.footer:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--teal-color), var(--purple-color), var(--yellow-color));
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.footer-info {
    flex: 1;
    min-width: 300px;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 12px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-logo {
    max-width: 150px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.footer-logo:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.2));
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    max-width: 300px;
    line-height: 1.8;
}

.footer-links {
    flex: 2;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.footer-links-column {
    min-width: 150px;
    margin-bottom: 30px;
    padding: 0 15px;
}

.footer-links-column h4 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
    display: inline-block;
}

.footer-links-column h4:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.footer-links-column ul li {
    margin-bottom: 12px;
    transition: all 0.3s ease;
}

.footer-links-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
    position: relative;
    padding-left: 0;
    display: inline-block;
}

.footer-links-column ul li a:before {
    content: '›';
    position: absolute;
    left: -15px;
    top: 0;
    opacity: 0;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.footer-links-column ul li a:hover {
    color: var(--primary-color);
    padding-left: 15px;
}

.footer-links-column ul li a:hover:before {
    opacity: 1;
    left: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
    position: relative;
}

.footer-bottom a:after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.footer-bottom a:hover:after {
    width: 100%;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .benefits-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .case-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .section-title {
        font-size: 2.2rem;
    }
    
    .hero h2 {
        font-size: 3rem;
    }
    
    .hero .subtitle {
        font-size: 1.6rem;
    }
    
    .timeline:before {
        left: 30px;
    }
    
    .timeline-dot {
        left: 30px;
    }
    
    .timeline-content {
        width: calc(100% - 80px);
        margin-left: 80px !important;
    }
    
    .timeline-item:nth-child(odd) .timeline-content:before,
    .timeline-item:nth-child(even) .timeline-content:before {
        left: -10px;
        right: auto;
    }
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .nav {
        width: 100%;
        margin-top: 15px;
        display: none;
    }
    
    .nav.active {
        display: block;
    }
    
    .nav ul {
        flex-direction: column;
    }
    
    .nav ul li {
        margin: 10px 0;
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
        position: absolute;
        top: 15px;
        right: 15px;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .hero h2 {
        font-size: 2.5rem;
    }
    
    .hero .subtitle {
        font-size: 1.4rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-container {
        grid-template-columns: 1fr;
    }
    
    .case-grid {
        grid-template-columns: 1fr;
    }
    
    .demo-pane.active {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .section-title {
        font-size: 2rem;
    }
    
    .hero h2 {
        font-size: 2.2rem;
    }
    
    .hero .subtitle {
        font-size: 1.2rem;
    }
    
    .contact-info {
        flex-direction: column;
    }
}

/* ===== 动画效果 ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}