/* 基础重置和变量 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066ff;
    --primary-dark: #0052cc;
    --secondary-color: #64748b;
    --accent-color: #00d4ff;
    --tech-blue: #1a73e8;
    --tech-cyan: #00bcd4;
    --tech-purple: #6366f1;
    --neon-green: #00ff88;
    --neon-blue: #00b4ff;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-bg: #f8fafc;
    --white: #ffffff;
    --dark: #0a0e1a;
    --tech-dark: #1a1d29;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --gradient-primary: linear-gradient(135deg, #0066ff 0%, #00d4ff 100%);
    --gradient-secondary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-accent: linear-gradient(135deg, #00bcd4 0%, #00ff88 100%);
    --gradient-tech: linear-gradient(135deg, #1a73e8 0%, #4285f4 50%, #00d4ff 100%);
    --gradient-dark: linear-gradient(135deg, #0a0e1a 0%, #1a1d29 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-neon: 0 0 20px rgba(0, 212, 255, 0.3), 0 0 40px rgba(0, 212, 255, 0.2);
    --shadow-glow: 0 0 30px rgba(26, 115, 232, 0.4);
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    overflow-x: hidden;
    background: var(--white);
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(0, 212, 255, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(26, 115, 232, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.01) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: 0 2px 20px rgba(0, 212, 255, 0.1);
}

.navbar::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--gradient-tech);
    opacity: 0.3;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    margin: 3px 0;
    transition: var(--transition);
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(26, 115, 232, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        linear-gradient(45deg, transparent 30%, rgba(0, 255, 136, 0.05) 50%, transparent 70%);
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 98px,
            rgba(0, 212, 255, 0.03) 100px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 98px,
            rgba(0, 212, 255, 0.03) 100px
        );
    animation: grid-move 20s linear infinite;
}

@keyframes grid-move {
    0% { transform: translate(0, 0); }
    100% { transform: translate(100px, 100px); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.1);
}

.hero .container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding-top: 70px;
}

.hero-content {
    color: white;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    display: block;
    font-size: 1.5rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

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

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

/* 仪表板预览 */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.dashboard-preview {
    width: 100%;
    max-width: 500px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(0, 212, 255, 0.3);
    overflow: hidden;
    box-shadow: var(--shadow-neon), var(--shadow-xl);
    position: relative;
}

.dashboard-preview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(0, 212, 255, 0.1) 0%, 
        transparent 20%, 
        transparent 80%, 
        rgba(0, 255, 136, 0.1) 100%
    );
    border-radius: var(--border-radius-lg);
    animation: dashboard-glow 3s ease-in-out infinite alternate;
}

@keyframes dashboard-glow {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

.dashboard-header {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-dots {
    display: flex;
    gap: 0.5rem;
}

.header-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.header-dots span:first-child {
    background: #ff5f56;
}

.header-dots span:nth-child(2) {
    background: #ffbd2e;
}

.header-dots span:last-child {
    background: #27ca3f;
}

.dashboard-content {
    padding: 2rem;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.dashboard-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    color: white;
    transition: var(--transition);
}

.dashboard-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
}

.dashboard-card i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

/* 通用区域样式 */
section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* 问题区域 */
.problems {
    background: var(--gray-50);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.problem-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-tech);
    transform: scaleX(0);
    transition: var(--transition);
}

.problem-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
    border-color: var(--tech-blue);
}

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

.problem-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-tech);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-neon);
    position: relative;
}

.problem-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-tech);
    opacity: 0;
    animation: pulse-icon 2s ease-in-out infinite;
}

@keyframes pulse-icon {
    0% { transform: scale(1); opacity: 0; }
    50% { transform: scale(1.2); opacity: 0.3; }
    100% { transform: scale(1.4); opacity: 0; }
}

.problem-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.problem-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.problem-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* 功能区域 */
.features {
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: stretch;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
    border-color: var(--tech-cyan);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-neon);
    position: relative;
}

.feature-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius);
    background: var(--gradient-accent);
    opacity: 0;
    animation: pulse-feature 3s ease-in-out infinite;
}

@keyframes pulse-feature {
    0% { transform: scale(1); opacity: 0; }
    50% { transform: scale(1.1); opacity: 0.2; }
    100% { transform: scale(1.2); opacity: 0; }
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--white);
    z-index: 1;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.feature-card ul {
    list-style: none;
    flex-grow: 1;
}

.feature-card li {
    padding: 0.75rem 0;
    color: var(--gray-600);
    border-bottom: 1px solid var(--gray-100);
    position: relative;
    padding-left: 1.5rem;
    transition: var(--transition);
}

.feature-card li:before {
    content: '▶';
    color: var(--tech-blue);
    position: absolute;
    left: 0;
    font-size: 0.8rem;
    transition: var(--transition);
}

.feature-card li:hover {
    color: var(--tech-blue);
    padding-left: 2rem;
}

.feature-card li:hover:before {
    color: var(--neon-green);
    transform: scale(1.2);
}

.feature-card li:last-child {
    border-bottom: none;
}

/* 定价区域 */
.pricing {
    background: var(--gray-50);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
    border: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-5px);
}

.featured-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-bottom-left-radius: var(--border-radius);
}

.pricing-header {
    padding: 2rem;
    text-align: center;
    background: var(--gradient-primary);
    color: var(--white);
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.currency {
    font-size: 1.25rem;
    font-weight: 500;
}

.amount {
    font-size: 3rem;
    font-weight: 700;
}

.period {
    font-size: 1rem;
    opacity: 0.8;
}

.pricing-features {
    padding: 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.pricing-features ul {
    list-style: none;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.pricing-features li {
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
    transition: var(--transition);
}

.pricing-features li:hover {
    color: var(--tech-blue);
    padding-left: 0.5rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i {
    color: var(--neon-green);
    font-size: 1rem;
    transition: var(--transition);
}

.pricing-features li:hover i {
    transform: scale(1.2);
}

.feature-note,
.service-note {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: auto;
    padding-top: 1rem;
    font-style: italic;
}

.pricing-footer {
    padding: 0 2rem 2rem;
    margin-top: auto;
}

.pricing-footer .btn {
    width: 100%;
    justify-content: center;
    background: var(--gradient-tech);
    color: var(--white);
    border: none;
    box-shadow: var(--shadow-neon);
}

.pricing-footer .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
}

/* 政策说明 */
.pricing-policy {
    margin: 4rem 0;
    text-align: center;
}

.pricing-policy h3 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 2rem;
}

.policy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.policy-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
}

.policy-item i {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.policy-item p {
    color: var(--gray-700);
    text-align: center;
    line-height: 1.6;
}

/* 技术规格 */
.tech-specs {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    margin-top: 3rem;
}

.tech-specs h3 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 2rem;
    text-align: center;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.spec-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.spec-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.spec-item p {
    color: var(--gray-600);
}

.specs-note {
    text-align: center;
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* 合作伙伴 */
.partners {
    background: var(--white);
    padding: 3rem 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    align-items: center;
}

.partner-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.partner-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    transform: scaleX(0);
    transition: var(--transition);
}

.partner-card.mobile::before {
    background: linear-gradient(90deg, #0073E6, #4A90E2);
}

.partner-card.unicom::before {
    background: linear-gradient(90deg, #FF0000, #FF6B6B);
}

.partner-card.telecom::before {
    background: linear-gradient(90deg, #009639, #4CAF50);
}

.partner-card.broadcast::before {
    background: linear-gradient(90deg, #6633FF, #8B5CF6);
}

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

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

.partner-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-neon);
    transition: var(--transition);
}

.partner-card.mobile .partner-icon {
    background: linear-gradient(135deg, #0073E6, #4A90E2);
}

.partner-card.unicom .partner-icon {
    background: linear-gradient(135deg, #FF0000, #FF6B6B);
}

.partner-card.telecom .partner-icon {
    background: linear-gradient(135deg, #009639, #4CAF50);
}

.partner-card.broadcast .partner-icon {
    background: linear-gradient(135deg, #6633FF, #8B5CF6);
}

.partner-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.partner-card:hover .partner-icon {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

.partner-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    text-align: center;
}

.partner-card p {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-align: center;
    font-style: italic;
}

/* 关于我们 */
.about {
    background: var(--gradient-primary);
    color: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text .section-header h2,
.about-text .section-header p {
    color: var(--white);
    text-align: left;
}

.vision-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

.contact-info {
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(10px);
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--white);
}

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

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

.contact-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
    width: 30px;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.25rem;
}

.contact-item p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

/* 页脚 */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 3rem 0 1rem;
}

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

.footer-logo h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.footer-logo p {
    color: var(--gray-400);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--white);
}

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

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 1rem;
    text-align: center;
    color: var(--gray-400);
}

/* 响应式设计 */
@media (max-width: 1024px) and (min-width: 769px) {
    .problems-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1rem 0;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .section-header h2 {
        font-size: 2rem;
    }

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

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

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

    .pricing-card.featured:hover {
        transform: translateY(-5px);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-text .section-header h2,
    .about-text .section-header p {
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .partners-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .policy-grid,
    .specs-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 1rem;
    }

    section {
        padding: 3rem 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .highlight {
        font-size: 1.2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .section-header p {
        font-size: 1rem;
    }

    .problem-card,
    .feature-card {
        padding: 1.5rem;
    }

    .pricing-header {
        padding: 1.5rem;
    }

    .pricing-features {
        padding: 1.5rem;
    }

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

    .contact-info {
        padding: 1.5rem;
    }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-left {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 焦点状态 */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 选择文本颜色 */
::selection {
    background: var(--primary-color);
    color: var(--white);
}