/* ===================================
   光子云手机 - 专业科技风设计
   参考VMOS Cloud风格，商业化科技感
   =================================== */

:root {
    /* 主色调 - 专业蓝科技风 */
    --primary-blue: #0066FF;
    --secondary-blue: #0052CC;
    --light-blue: #E6F0FF;
    --dark-blue: #0F172A;
    --navy: #1E293B;

    /* 中性色 */
    --white: #FFFFFF;
    --off-white: #F8FAFC;
    --light-gray: #E2E8F0;
    --gray: #94A3B8;
    --dark-gray: #64748B;
    --text-dark: #1E293B;
    --text-light: #64748B;

    /* 功能色 */
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;

    /* 间距系统 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;
    --spacing-5xl: 128px;

    /* 字体大小 */
    --font-xs: 12px;
    --font-sm: 14px;
    --font-base: 16px;
    --font-lg: 18px;
    --font-xl: 20px;
    --font-2xl: 24px;
    --font-3xl: 32px;
    --font-3-5xl: 40px;
    --font-4xl: 48px;
    --font-4-5xl: 56px;
    --font-5xl: 64px;
    --font-6xl: 80px;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 102, 255, 0.10), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 102, 255, 0.12), 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px rgba(0, 102, 255, 0.15), 0 4px 6px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 20px 25px rgba(0, 102, 255, 0.20), 0 10px 10px rgba(0, 0, 0, 0.12);

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 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', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: var(--font-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 14px 32px;
    font-size: var(--font-base);
    font-weight: 600;
    letter-spacing: 0.3px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    text-transform: none;
    white-space: nowrap;
    border-radius: var(--radius-md);
}

.btn:active {
    transform: scale(0.98);
}

/* 主要按钮 - 蓝色 */
.btn-primary {
    background: var(--primary-blue);
    color: var(--white) !important;
    border: 2px solid var(--primary-blue);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.25);
}

.btn-primary:hover {
    background: var(--secondary-blue);
    color: var(--white) !important;
    border-color: var(--secondary-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.35);
}

/* 次要按钮 - 白色背景 */
.btn-secondary {
    background: var(--white);
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white) !important;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.25);
}

/* 轮廓按钮 */
.btn-outline {
    background: transparent;
    color: var(--primary-blue) !important;
    border: 2px solid var(--primary-blue);
}

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--white) !important;
    border-color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.25);
}

/* ==================== 区块样式 ==================== */
.section {
    padding: var(--spacing-5xl) 0;
    position: relative;
}

.section-alt {
    background-color: var(--off-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
    position: relative;
}

.section-title {
    font-size: var(--font-5xl);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -1px;
    line-height: 1.1;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-blue);
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-xl);
    color: var(--text-light);
    max-width: 600px;
    margin: var(--spacing-xl) auto 0;
    line-height: 1.7;
}

/* ==================== 导航栏 ==================== */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--light-gray);
    transition: all var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    height: 72px;
}

.nav-brand a {
    font-size: var(--font-2xl);
    font-weight: 800;
    color: var(--primary-blue);
    text-decoration: none;
    letter-spacing: -0.5px;
    transition: color var(--transition-fast);
}

.nav-brand a:hover {
    color: var(--secondary-blue);
}

.nav-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-menu li a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-base);
    padding: 8px 12px;
    transition: all var(--transition-fast);
    position: relative;
    letter-spacing: 0.3px;
}

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

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.nav-menu li a:hover::after {
    width: 80%;
}

/* 导航栏按钮 */
.nav-menu .btn-primary {
    margin-left: var(--spacing-lg);
    padding: 12px 28px;
    font-size: var(--font-base);
    font-weight: 700;
    background: var(--primary-blue);
    color: var(--white) !important;
    border: 2px solid var(--primary-blue);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.25);
}

.nav-menu .btn-primary:hover {
    background: var(--secondary-blue);
    color: var(--white) !important;
    border-color: var(--secondary-blue);
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.35);
}

/* 语言切换器 */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: var(--spacing-md);
    padding: 6px 12px;
    background: var(--off-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--light-gray);
}

.lang-switcher::after {
    display: none;
}

.lang-switcher .lang-btn {
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: var(--font-sm);
    font-weight: 600;
    padding: 2px 4px;
    transition: all var(--transition-fast);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    text-decoration: none;
}

.lang-switcher .lang-btn:hover {
    color: var(--primary-blue);
}

.lang-switcher .lang-btn.active {
    color: var(--primary-blue);
    font-weight: 700;
}

.lang-divider {
    color: var(--gray);
    font-size: var(--font-sm);
    font-weight: 400;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 10px;
    background: var(--off-white);
    border-radius: var(--radius-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary-blue);
    transition: all var(--transition-normal);
}

/* ==================== 主视觉区域 ==================== */
.hero {
    position: relative;
    padding: var(--spacing-5xl) 0 var(--spacing-4xl);
    background: var(--white);
    color: var(--text-dark);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 45%;
    height: 100%;
    background: var(--light-blue);
    clip-path: polygon(15% 0%, 100% 0%, 100% 100%, 0% 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: var(--font-4-5xl);
    font-weight: 900;
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -1px;
}

.hero-title-accent {
    font-size: var(--font-6xl);
    color: var(--primary-blue);
    position: relative;
    display: inline-block;
    letter-spacing: -2px;
}

.hero-title-link {
    color: var(--text-dark);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.hero-title-link:hover {
    color: var(--primary-blue);
}

.hero-subtitle {
    font-size: var(--font-lg);
    color: var(--text-light);
    margin-bottom: var(--spacing-3xl);
    line-height: 1.8;
    max-width: 500px;
}

.hero-badges {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-3xl);
}

.hero-badge {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--white);
    border: 2px solid var(--light-gray);
    min-width: auto;
    transition: all var(--transition-normal);
    border-radius: var(--radius-md);
}

.hero-badge:hover {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.badge-number {
    font-size: var(--font-lg);
    font-weight: 900;
    color: var(--primary-blue);
    line-height: 1;
}

.hero-badge:hover .badge-number {
    color: var(--white);
}

.badge-text {
    font-size: var(--font-xs);
    color: var(--text-light);
    margin-top: 0;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.hero-badge:hover .badge-text {
    color: var(--white);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-visual {
    display: flex;
    justify-content: center;
    animation: fadeIn 1s ease, slideInRight 1s ease;
    position: relative;
}

.hero-visual::before {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--primary-blue);
    border-radius: 50%;
    top: 15%;
    right: 8%;
    animation: sparkle 3s ease-in-out infinite;
    opacity: 0;
    box-shadow: 0 0 15px rgba(0, 102, 255, 1);
}

.hero-visual::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: #00F5FF;
    border-radius: 50%;
    bottom: 15%;
    left: 12%;
    animation: sparkle 4s ease-in-out infinite 2s;
    opacity: 0;
    box-shadow: 0 0 15px rgba(0, 245, 255, 1);
}

@keyframes sparkle {
    0%, 100% {
        opacity: 0;
        transform: scale(0);
    }
    50% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes floatDot {
    0%, 100% {
        transform: translateY(0px) scale(1);
        opacity: 0.4;
    }
    50% {
        transform: translateY(-30px) scale(1.2);
        opacity: 0.8;
    }
}

.hero-visual-card {
    position: relative;
    width: 100%;
    max-width: 800px;
    animation: floatImage 4s ease-in-out infinite;
}

.hero-visual-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    background: conic-gradient(from 0deg, transparent, rgba(0, 102, 255, 0.1), transparent 30%);
    transform: translate(-50%, -50%);
    animation: rotateCone 10s linear infinite;
    z-index: -1;
    border-radius: 50%;
}

.hero-visual-card::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 130%;
    height: 130%;
    background: conic-gradient(from 180deg, transparent, rgba(0, 245, 255, 0.08), transparent 30%);
    transform: translate(-50%, -50%);
    animation: rotateCone 8s linear infinite reverse;
    z-index: -1;
    border-radius: 50%;
}

@keyframes floatImage {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-15px);
    }
}

@keyframes rotateCone {
    0% {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.visual-image {
    position: relative;
    background: transparent;
    padding: 0;
    box-shadow: 0 25px 80px rgba(0, 102, 255, 0.35);
    transition: all var(--transition-slow);
    border: none;
    border-radius: var(--radius-xl);
    overflow: visible;
    animation: glowPulse 5s ease-in-out infinite;
}

.visual-image::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--primary-blue), transparent, #00F5FF, transparent, var(--primary-blue));
    background-size: 400% 400%;
    border-radius: var(--radius-xl);
    z-index: -1;
    animation: gradientBorder 6s ease infinite;
    opacity: 0.6;
}

.visual-image::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 110%;
    height: 110%;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.08) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    animation: breathe 3s ease-in-out infinite;
    z-index: -1;
}

.visual-image:hover {
    transform: scale(1.03);
    box-shadow: 0 35px 100px rgba(0, 102, 255, 0.5);
}

@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 25px 80px rgba(0, 102, 255, 0.35);
    }
    50% {
        box-shadow: 0 30px 100px rgba(0, 102, 255, 0.45);
    }
}

@keyframes gradientBorder {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes breathe {
    0%, 100% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.05);
    }
}

.hero-product-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
    transition: transform var(--transition-normal);
}

.phone-mockup {
    width: 100%;
    height: 500px;
    background: var(--off-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
    border: 2px solid var(--light-gray);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.screen-content {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.screen-header {
    padding: var(--spacing-lg);
    background: var(--primary-blue);
    color: var(--white);
    font-weight: 700;
    font-size: var(--font-lg);
    position: relative;
}

.screen-header::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--white);
    opacity: 0.5;
}

.screen-body {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.screen-item {
    height: 48px;
    background: var(--off-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--light-gray);
    animation: pulse 2s ease-in-out infinite;
}

.screen-item:nth-child(1) { animation-delay: 0s; }
.screen-item:nth-child(2) { animation-delay: 0.3s; }
.screen-item:nth-child(3) { animation-delay: 0.6s; }

.floating-badge {
    position: absolute;
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 700;
    font-size: var(--font-base);
    box-shadow: var(--shadow-lg);
    animation: float 3s ease-in-out infinite;
    white-space: nowrap;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.floating-badge-1 {
    top: 40px;
    right: -30px;
    animation-delay: 0s;
}

.floating-badge-2 {
    top: 50%;
    right: -60px;
    transform: translateY(-50%);
    animation-delay: 1s;
}

.floating-badge-3 {
    bottom: 40px;
    right: -30px;
    animation-delay: 2s;
}

/* ==================== 产品介绍 ==================== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.product-card {
    background: var(--white);
    padding: var(--spacing-3xl);
    border: 2px solid var(--light-gray);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    border-radius: var(--radius-xl);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-blue);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

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

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

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-2xl);
    background: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    transition: all var(--transition-normal);
    border-radius: var(--radius-xl);
}

.product-card:hover .card-icon {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1);
}

.card-icon svg {
    width: 40px;
    height: 40px;
}

.product-card h3 {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.product-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: var(--font-base);
}

/* ==================== 价格方案 ==================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--light-gray);
    padding: var(--spacing-3xl);
    transition: all var(--transition-normal);
    position: relative;
    border-radius: var(--radius-xl);
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-blue);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

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

.pricing-card.featured {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
    z-index: 1;
}

.pricing-card.featured::before {
    transform: scaleX(1);
}

.pricing-card.featured:hover {
    transform: translateY(-8px) scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--primary-blue);
    color: var(--white);
    padding: 6px 16px;
    font-size: var(--font-sm);
    font-weight: 700;
    box-shadow: var(--shadow-md);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-md);
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.pricing-header h3 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: var(--spacing-lg);
}

.currency {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--primary-blue);
}

.amount {
    font-size: var(--font-5xl);
    font-weight: 900;
    color: var(--primary-blue);
    line-height: 1;
}

.period {
    font-size: var(--font-base);
    color: var(--text-light);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-3xl);
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-light);
    font-size: var(--font-base);
    line-height: 1.6;
}

.pricing-features li:before {
    content: "✓";
    color: var(--primary-blue);
    margin-right: var(--spacing-sm);
    font-weight: 700;
}

.pricing-card .btn {
    width: 100%;
    font-size: var(--font-base);
    padding: 14px 24px;
}

/* ==================== 功能介绍 ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-3xl);
    background: var(--white);
    border: 2px solid var(--light-gray);
    transition: all var(--transition-normal);
    position: relative;
    border-radius: var(--radius-xl);
    text-align: left;
}

.feature-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-blue);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

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

.feature-item:hover::before {
    transform: scaleY(1);
}

.feature-icon {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    background: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    transition: all var(--transition-normal);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-sm);
}

.feature-item:hover .feature-icon {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1);
}

.feature-icon svg {
    width: 36px;
    height: 36px;
    stroke-width: 2;
}

.feature-item h3 {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: var(--font-base);
    margin: 0;
}

/* ==================== 核心优势 ==================== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
}

.advantage-item {
    position: relative;
    padding: var(--spacing-3xl);
    background: var(--white);
    border: 2px solid var(--light-gray);
    transition: all var(--transition-normal);
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background: var(--primary-blue);
    opacity: 0.05;
    clip-path: polygon(100% 0%, 0% 0%, 100% 100%);
    transition: opacity var(--transition-normal);
}

.advantage-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.advantage-item:hover::before {
    opacity: 0.1;
}

.advantage-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 72px;
    font-weight: 900;
    color: var(--light-gray);
    line-height: 1;
    transition: all var(--transition-normal);
}

.advantage-item:hover .advantage-number {
    color: var(--primary-blue);
    opacity: 0.15;
}

.advantage-item h3 {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    position: relative;
    line-height: 1.4;
}

.advantage-item p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: var(--font-base);
}

/* ==================== 应用场景 ==================== */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.scenario-card {
    background: var(--white);
    padding: var(--spacing-3xl);
    border: 2px solid var(--light-gray);
    transition: all var(--transition-normal);
    position: relative;
    border-radius: var(--radius-xl);
}

.scenario-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-blue);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.scenario-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.scenario-card:hover::after {
    transform: scaleX(1);
}

.scenario-icon {
    width: 64px;
    height: 64px;
    background: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-2xl);
    transition: all var(--transition-normal);
    border-radius: var(--radius-xl);
}

.scenario-card:hover .scenario-icon {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1) rotate(5deg);
}

.scenario-icon svg {
    width: 32px;
    height: 32px;
}

.scenario-card h3 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
}

.scenario-card p {
    color: var(--text-light);
    line-height: 1.7;
    font-size: var(--font-base);
}

/* ==================== 下载区域 ==================== */
.download-content {
    display: flex;
    justify-content: center;
}

.download-platforms {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
    max-width: 900px;
}

.platform-card {
    background: var(--white);
    padding: var(--spacing-3xl);
    border: 2px solid var(--light-gray);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    border-radius: var(--radius-xl);
}

.platform-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--primary-blue);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.platform-card:hover::before {
    opacity: 0.05;
}

.platform-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-2xl);
    background: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-blue);
    transition: all var(--transition-normal);
    border-radius: var(--radius-xl);
}

.platform-card:hover .platform-icon {
    background: var(--primary-blue);
    color: var(--white);
    transform: scale(1.1);
}

.platform-icon svg {
    width: 40px;
    height: 40px;
}

.platform-card h3 {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.platform-card > p {
    color: var(--text-light);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-base);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.download-btn {
    width: 100%;
    margin-top: var(--spacing-sm);
    font-size: var(--font-base);
}

/* ==================== 客户案例 ==================== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
}

.testimonial-card {
    background: var(--white);
    padding: var(--spacing-3xl);
    border: 2px solid var(--light-gray);
    position: relative;
    transition: all var(--transition-normal);
    border-radius: var(--radius-xl);
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    font-size: 80px;
    font-weight: 900;
    color: var(--primary-blue);
    line-height: 1;
    opacity: 0.2;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.testimonial-content {
    margin-bottom: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.testimonial-content p {
    color: var(--text-dark);
    line-height: 1.9;
    font-style: italic;
    font-size: var(--font-base);
}

.testimonial-author {
    border-top: 2px solid var(--light-gray);
    padding-top: var(--spacing-xl);
}

.author-info h4 {
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.author-info span {
    color: var(--text-light);
    font-size: var(--font-sm);
    font-weight: 500;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--dark-blue);
    color: var(--white);
    padding: var(--spacing-5xl) 0 var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-blue);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
    position: relative;
    z-index: 1;
}

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

.footer-brand h3 {
    font-size: var(--font-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.5px;
    color: var(--white);
}

.footer-brand p {
    color: var(--gray);
    line-height: 1.8;
    max-width: 100%;
    font-size: var(--font-base);
}

.footer-column h4 {
    font-size: var(--font-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
    letter-spacing: 0.3px;
}

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

.footer-column ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-column ul li a {
    color: var(--gray);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    display: inline-block;
    font-size: var(--font-base);
}

.footer-column ul li a:hover {
    color: var(--primary-blue);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-2xl);
    text-align: center;
}

.footer-bottom p {
    color: var(--gray);
    font-size: var(--font-base);
}

.footer-bottom a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ==================== 动画 ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-badges {
        justify-content: center;
        flex-wrap: wrap;
    }

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

    .hero-visual {
        margin-top: var(--spacing-3xl);
    }

    .hero-visual-card {
        max-width: 650px;
    }

    .visual-image {
        box-shadow: 0 15px 50px rgba(0, 102, 255, 0.25);
    }

    .hero-title {
        font-size: var(--font-3-5xl);
    }

    .hero-title-accent {
        font-size: var(--font-5xl);
    }

    .section-title {
        font-size: var(--font-4xl);
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .lang-switcher {
        margin-left: var(--spacing-sm);
        padding: 4px 8px;
    }

    .lang-btn {
        font-size: var(--font-xs);
        padding: 2px 3px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: var(--font-2xl);
    }

    .hero-title-accent {
        font-size: var(--font-4xl);
    }

    .hero-visual-card {
        max-width: 550px;
    }

    .visual-image {
        box-shadow: 0 15px 50px rgba(0, 102, 255, 0.25);
    }

    .section-title {
        font-size: var(--font-3xl);
    }

    .section {
        padding: var(--spacing-4xl) 0;
    }

    .download-platforms {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-visual-card {
        max-width: 100%;
    }

    .hero-visual-card::before,
    .hero-visual-card::after {
        display: none;
    }

    .visual-image {
        box-shadow: 0 15px 50px rgba(0, 102, 255, 0.25);
    }

    .visual-image::before,
    .visual-image::after {
        display: none;
    }

    .hero-visual::before,
    .hero-visual::after {
        display: none;
    }

    .hero-title {
        font-size: var(--font-xl);
    }

    .hero-title-accent {
        font-size: var(--font-3xl);
    }

    .section-title {
        font-size: var(--font-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-lg);
    }

    .hero-badges {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-badge {
        min-width: 90px;
        padding: var(--spacing-md);
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}