/* ========================================
   商裕通智慧网 - 主样式表
   ShangYuTong Intelligence Website
   ======================================== */

/* --- CSS 变量 / 设计令牌 --- */
:root {
    /* 主色调 */
    --color-primary: #1a56db;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-primary-bg: #eff6ff;

    /* 辅助色 */
    --color-secondary: #7c3aed;
    --color-accent: #f59e0b;

    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* 功能色 */
    --color-green: #059669;
    --color-red: #dc2626;
    --color-orange: #ea580c;
    --color-cyan: #0891b2;
    --color-purple: #7c3aed;

    /* 排版 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;

    /* 间距 */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.1);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

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

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* --- Container --- */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   按钮系统
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(26, 86, 219, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    box-shadow: 0 4px 16px rgba(26, 86, 219, 0.4);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-gray-300);
}

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

.btn-white {
    background: var(--color-white);
    color: var(--color-primary);
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

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

.btn-outline-light {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 17px;
    border-radius: var(--radius-md);
}

.btn-block {
    width: 100%;
}

/* ========================================
   导航栏 Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

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

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

.logo-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    line-height: 1.3;
}

.logo-subtitle {
    font-size: 10px;
    color: var(--color-gray-400);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

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

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-600);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ========================================
   Hero 主视觉区域
   ======================================== */
.hero {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
}

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

.hero-gradient-1 {
    position: absolute;
    top: -30%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(26, 86, 219, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-gradient-2 {
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(26, 86, 219, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26, 86, 219, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 20px;
    background: var(--color-primary-bg);
    border: 1px solid #bfdbfe;
    border-radius: 50px;
    font-size: 14px;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 24px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    color: var(--color-gray-900);
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 20px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-title-highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--color-gray-500);
    line-height: 1.8;
    margin-bottom: 48px;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Hero 三大特色 */
.hero-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 32px 20px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--color-gray-100);
}

.hero-feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-bg);
}

.hero-feature-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-feature-text h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 8px;
}

.hero-feature-text p {
    font-size: 14px;
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* Hero CTA */
.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    padding-top: 40px;
    border-top: 1px solid var(--color-gray-200);
    animation: fadeInUp 0.6s ease-out 0.5s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--color-gray-400);
}

/* ========================================
   Section 通用标题
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 4px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-bg);
    border-radius: 50px;
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.section-title {
    font-size: 38px;
    font-weight: 800;
    color: var(--color-gray-900);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 17px;
    color: var(--color-gray-500);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ========================================
   解决方案 Solutions
   ======================================== */
.solutions {
    padding: var(--section-padding);
    background: var(--color-gray-50);
}

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

.solution-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--color-gray-100);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.solution-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--color-white);
}

.solution-card-icon.blue { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.solution-card-icon.green { background: linear-gradient(135deg, #10b981, #059669); }
.solution-card-icon.purple { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
.solution-card-icon.orange { background: linear-gradient(135deg, #f97316, #ea580c); }
.solution-card-icon.cyan { background: linear-gradient(135deg, #06b6d4, #0891b2); }
.solution-card-icon.red { background: linear-gradient(135deg, #ef4444, #dc2626); }

.solution-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 10px;
}

.solution-card p {
    font-size: 14px;
    color: var(--color-gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
    flex: 1;
}

.solution-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.solution-link:hover {
    gap: 8px;
}

/* ========================================
   核心功能 Features
   ======================================== */
.features {
    padding: var(--section-padding);
}

.features-showcase {
    max-width: 1000px;
    margin: 0 auto;
}

.features-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    justify-content: center;
    flex-wrap: wrap;
}

.feature-tab {
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-gray-500);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
}

.feature-tab:hover {
    color: var(--color-primary);
    border-color: #bfdbfe;
}

.feature-tab.active {
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
}

.feature-panel {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.feature-panel.active {
    display: block;
}

.feature-panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.feature-panel-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 16px;
}

.feature-panel-text p {
    font-size: 16px;
    color: var(--color-gray-500);
    line-height: 1.8;
    margin-bottom: 24px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.feature-list li::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
    background: var(--color-primary-bg);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231a56db' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: 12px;
    background-position: center;
    background-repeat: no-repeat;
}

/* Feature Mockup UI */
.feature-mockup {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.mockup-header {
    display: flex;
    gap: 8px;
    padding: 14px 18px;
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mockup-dot.red { background: #ef4444; }
.mockup-dot.yellow { background: #f59e0b; }
.mockup-dot.green { background: #10b981; }

.mockup-body {
    padding: 20px;
    display: flex;
    gap: 16px;
    min-height: 220px;
}

.mockup-sidebar {
    width: 50px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mockup-line {
    height: 8px;
    background: var(--color-gray-200);
    border-radius: 4px;
}

.mockup-line.short { width: 60%; }
.mockup-line.medium { width: 90%; }

.mockup-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mockup-card {
    padding: 16px;
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-sm);
}

.mockup-card-bar {
    height: 6px;
    background: var(--color-gray-200);
    border-radius: 3px;
    margin-bottom: 10px;
    width: 40%;
}

.mockup-card-bar.blue {
    background: #bfdbfe;
}

.mockup-card-line {
    height: 6px;
    background: var(--color-gray-100);
    border-radius: 3px;
    margin-bottom: 6px;
}

.mockup-card-line.short {
    width: 60%;
}

/* Marketing mockup */
.marketing-mockup {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    padding: 30px 20px;
}

.mkt-chart {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    height: 160px;
    flex: 1;
}

.mkt-bar {
    flex: 1;
    background: var(--color-gray-200);
    border-radius: 6px 6px 0 0;
    transition: var(--transition);
}

.mkt-bar.accent {
    background: linear-gradient(180deg, var(--color-primary-light), var(--color-primary));
}

/* Data mockup */
.data-mockup {
    padding: 30px 20px;
}

.data-line-chart {
    width: 100%;
    height: auto;
}

/* Chat mockup */
.chat-mockup {
    flex-direction: column;
    gap: 10px;
    padding: 20px;
}

.chat-bubble {
    max-width: 80%;
    padding: 10px 16px;
    border-radius: 16px;
    font-size: 13px;
    line-height: 1.5;
}

.chat-bubble.received {
    align-self: flex-start;
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border-bottom-left-radius: 4px;
}

.chat-bubble.sent {
    align-self: flex-end;
    background: var(--color-primary-bg);
    color: var(--color-gray-700);
    border-bottom-right-radius: 4px;
}

/* ========================================
   关于我们 About
   ======================================== */
.about {
    padding: var(--section-padding);
    background: var(--color-gray-50);
}

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

.about-image {
    position: relative;
}

.about-image-placeholder {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-100);
}

.about-illustration {
    width: 100%;
    aspect-ratio: 4/3;
}

.about-experience {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    padding: 20px 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

.about-exp-number {
    display: block;
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 4px;
}

.about-exp-label {
    font-size: 13px;
    opacity: 0.9;
}

.about-content .section-title {
    margin-bottom: 24px;
}

.about-text {
    font-size: 16px;
    color: var(--color-gray-500);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.value-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-700);
}

/* ========================================
   服务价格 Pricing
   ======================================== */
.pricing {
    padding: var(--section-padding);
}

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

.pricing-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
    transform: scale(1.03);
}

.pricing-card.featured:hover {
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    padding: 6px 24px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
}

.pricing-card-header {
    text-align: center;
    margin-bottom: 28px;
}

.pricing-card-header h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 6px;
}

.pricing-card-header p {
    font-size: 14px;
    color: var(--color-gray-400);
    margin-bottom: 20px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
}

.pricing-currency {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-gray-900);
}

.pricing-amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--color-gray-900);
    line-height: 1;
}

.pricing-period {
    font-size: 15px;
    color: var(--color-gray-400);
}

.pricing-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.pricing-features li {
    font-size: 14px;
    color: var(--color-gray-600);
    padding-left: 24px;
    position: relative;
}

.pricing-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: var(--color-primary-bg);
    border-radius: 50%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%231a56db' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-size: 10px;
    background-position: center;
    background-repeat: no-repeat;
}

/* ========================================
   CTA 区域
   ======================================== */
.cta {
    position: relative;
    padding: 100px 0;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.cta-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%);
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--color-white);
}

.cta-title {
    font-size: 38px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.cta-desc {
    font-size: 17px;
    opacity: 0.85;
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 40px;
}

.cta-contact-info {
    display: flex;
    justify-content: center;
    gap: 32px;
    opacity: 0.8;
}

.cta-contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

/* ========================================
   页脚 Footer
   ======================================== */
.footer {
    background: var(--color-gray-900);
    padding: 64px 0 0;
    color: var(--color-gray-400);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--color-gray-800);
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 16px;
}

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

.footer-links h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-gray-400);
    transition: var(--transition);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-beian {
    display: flex;
    gap: 16px;
}

.footer-beian a {
    color: var(--color-gray);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-beian a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 滚动淡入动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ========================================
   响应式设计 Responsive
   ======================================== */

/* 平板 (≤1024px) */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 40px;
    }

    .hero-features {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin-left: auto;
        margin-right: auto;
    }

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

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

    .feature-panel-image {
        order: -1;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-experience {
        right: 10px;
        bottom: -15px;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }

    .pricing-card.featured {
        transform: none;
    }

    .pricing-card.featured:hover {
        transform: translateY(-4px);
    }

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

    .hero-stats {
        gap: 40px;
    }

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

/* 手机 (≤768px) */
@media (max-width: 768px) {
    /* 导航 */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-white);
        padding: 100px 32px 32px;
        box-shadow: var(--shadow-xl);
        transition: var(--transition);
        z-index: 999;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .nav-link {
        font-size: 17px;
        padding: 10px 16px;
    }

    .header-actions {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    /* Hero */
    .hero {
        padding: 120px 0 60px;
    }

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

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

    .hero-desc br {
        display: none;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        gap: 24px;
        flex-direction: column;
    }

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

    /* Solutions */
    .solutions-grid {
        grid-template-columns: 1fr;
    }

    /* Features */
    .features-tabs {
        gap: 6px;
    }

    .feature-tab {
        padding: 8px 16px;
        font-size: 13px;
    }

    .feature-panel-text h3 {
        font-size: 22px;
    }

    /* About */
    .about-grid {
        gap: 32px;
    }

    .about-experience {
        position: static;
        margin-top: 16px;
        display: inline-block;
    }

    /* CTA */
    .cta-title {
        font-size: 28px;
    }

    .cta-actions {
        flex-direction: column;
        align-items: center;
    }

    .cta-contact-info {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-beian {
        flex-direction: column;
        align-items: center;
        gap: 4px;
    }

    .section-title {
        font-size: 26px;
    }
}

/* 小手机 (≤480px) */
@media (max-width: 480px) {
    .hero-badge {
        font-size: 12px;
        padding: 4px 14px;
    }

    .hero-title {
        font-size: 26px;
    }

    .btn-lg {
        padding: 12px 24px;
        font-size: 15px;
    }
}