/* ==================== 赛博水墨 - 科技与传统的融合 ==================== */
:root {
    /* 传统石青色系 - 中国画颜料色 */
    --cyber-blue: #156082;
    --cyber-cyan: #2b7a9b;
    --cyber-purple: #4a7c8e;
    --cyber-pink: #3d6b7d;
    --neon-glow: #2b7a9b;
    
    /* 传统墨色系统 */
    --ink-black: #1a1f35;
    --ink-deep: #252b42;
    --ink-gray: #374151;
    --ink-medium: #4b5563;
    --smoke-white: #e5e7eb;
    --rice-paper: #f3f4f6;
    
    /* 主色调 - 赛博水墨融合 */
    --primary: var(--cyber-cyan);
    --primary-dark: #0891b2;
    --primary-glow: rgba(0, 195, 255, 0.5);
    --secondary: var(--cyber-purple);
    --accent: var(--cyber-pink);
    
    /* 传统渐变 - 石青色 */
    --gradient-cyber: linear-gradient(135deg, #156082 0%, #2b7a9b 100%);
    --gradient-neon: linear-gradient(90deg, #156082 0%, #2b7a9b 50%, #3d6b7d 100%);
    --gradient-hologram: linear-gradient(135deg, rgba(43,122,155,0.12) 0%, rgba(74,124,142,0.12) 100%);
    --gradient-ink-smoke: radial-gradient(circle, rgba(43,122,155,0.08) 0%, transparent 70%);
    
    /* 背景色 - 宣纸质感 */
    --bg-primary: linear-gradient(135deg, #f5f3ed 0%, #ebe8df 50%, #f5f3ed 100%);
    --bg-secondary: #ebe8df;
    --bg-card: rgba(255, 255, 255, 0.6);
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    /* 文字颜色 - 墨色与霓虹 */
    --text-primary: #1a1f35;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    --text-neon: var(--cyber-cyan);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* 动画 */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 石青光晕 - 优雅内敛 */
    --shadow-neon: 0 0 20px rgba(43, 122, 155, 0.4), 0 0 40px rgba(43, 122, 155, 0.2);
    --shadow-neon-strong: 0 0 30px rgba(43, 122, 155, 0.6), 0 0 60px rgba(43, 122, 155, 0.4);
    --shadow-purple: 0 0 20px rgba(61, 107, 125, 0.4), 0 0 40px rgba(61, 107, 125, 0.2);
    --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.15);

    /* ==================== 布局与尺寸 ==================== */
    --header-height: 70px;
    --product-card-height: 550px; /* <--- 卡片高度变量 */
    --max-width: 1400px;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Orbitron', 'STKaiti', 'KaiTi', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    background: #f5f3ed;
    background-image: 
        linear-gradient(135deg, #f5f3ed 0%, #ebe8df 50%, #f5f3ed 100%),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0, 0, 0, 0.015) 2px, rgba(0, 0, 0, 0.015) 4px),
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(0, 0, 0, 0.015) 2px, rgba(0, 0, 0, 0.015) 4px);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.8;
    position: relative;
}

/* 石青水墨烟雾背景 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(43, 122, 155, 0.06) 0%, transparent 35%),
        radial-gradient(circle at 80% 70%, rgba(61, 107, 125, 0.05) 0%, transparent 35%),
        radial-gradient(circle at 50% 50%, rgba(43, 122, 155, 0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
    animation: ink-flow 20s ease-in-out infinite;
    mix-blend-mode: multiply;
    opacity: 0.7;
}

@keyframes ink-flow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(5%, 5%) scale(1.1); }
    66% { transform: translate(-5%, 3%) scale(0.95); }
}

/* 纸张纹理 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
    opacity: 0.5;
}

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

/* ==================== 粒子背景 - 赛博光点效果 ==================== */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.6;
    filter: blur(0.5px);
}

/* ==================== 导航栏 - 宣纸质感 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(245, 243, 237, 0.9);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 2px solid rgba(43, 122, 155, 0.4);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08), 0 0 20px rgba(43, 122, 155, 0.15);
    transition: all var(--transition-normal);
}

.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--cyber-cyan) 20%, 
        var(--cyber-blue) 50%, 
        var(--cyber-cyan) 80%, 
        transparent 100%
    );
    opacity: 0.6;
    animation: border-flow 3s linear infinite;
}

@keyframes border-flow {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.navbar.scrolled {
    background: rgba(245, 243, 237, 0.98);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12), var(--shadow-neon);
    border-bottom-color: rgba(43, 122, 155, 0.5);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.6rem 2rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    padding: 0.3rem 0;
}

.logo-img {
    height: 55px;
    max-width: 320px;
    width: auto;
    object-fit: contain;
    transition: all var(--transition-normal);
    filter: drop-shadow(0 0 15px rgba(43, 122, 155, 0.6)) 
            drop-shadow(0 0 30px rgba(43, 122, 155, 0.4))
            contrast(1.2) brightness(1.1);
    cursor: pointer;
    animation: logo-pulse 3s ease-in-out infinite;
}

@keyframes logo-pulse {
    0%, 100% {
        filter: drop-shadow(0 0 15px rgba(43, 122, 155, 0.6)) 
                drop-shadow(0 0 30px rgba(43, 122, 155, 0.4))
                contrast(1.2) brightness(1.1);
    }
    50% {
        filter: drop-shadow(0 0 25px rgba(43, 122, 155, 0.8)) 
                drop-shadow(0 0 50px rgba(43, 122, 155, 0.6))
                contrast(1.3) brightness(1.2);
    }
}

.logo-img:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 35px rgba(43, 122, 155, 1)) 
            drop-shadow(0 0 70px rgba(61, 107, 125, 0.8))
            contrast(1.4) brightness(1.3);
    animation: none;
}

.logo-text {
    color: var(--text-primary);
}

.logo-glow {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s ease-in-out infinite;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    justify-content: flex-end;
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    transition: all var(--transition-normal);
    padding: 0.8rem 1.5rem;
    font-size: 1.05rem;
    display: inline-block;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-family: 'Orbitron', sans-serif;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0.3rem;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-cyber);
    box-shadow: var(--shadow-neon);
    transition: width var(--transition-normal);
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-hologram);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: 4px;
    z-index: -1;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-neon);
    text-shadow: 0 0 10px rgba(0, 217, 255, 0.8), 0 0 20px rgba(0, 217, 255, 0.5);
    transform: translateY(-2px);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 70%;
}

.nav-link:hover::after,
.nav-link.active::after {
    opacity: 1;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 30px;
    height: 3px;
    background: var(--ink-black);
    border-radius: 0;
    transition: all var(--transition-normal);
}

/* ==================== Hero Section ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: var(--spacing-lg) var(--spacing-md);
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1000px;
    height: 1000px;
    background: radial-gradient(circle, 
        rgba(0, 217, 255, 0.15) 0%, 
        rgba(176, 38, 255, 0.1) 40%, 
        transparent 70%
    );
    animation: cyber-pulse 4s ease-in-out infinite;
    filter: blur(60px);
}

@keyframes cyber-pulse {
    0%, 100% {
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.2) rotate(180deg);
    }
}

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

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.title-line {
    opacity: 0;
    transform: translateY(30px);
    animation: slideUp 0.8s ease forwards;
}

.title-line:nth-child(1) {
    animation-delay: 0.1s;
}

.title-line:nth-child(2) {
    animation-delay: 0.3s;
}

.title-line:nth-child(3) {
    animation-delay: 0.5s;
}

@keyframes slideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gradient-text {
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
    font-weight: 900;
    filter: drop-shadow(0 0 20px rgba(0, 217, 255, 0.8)) 
            drop-shadow(0 0 40px rgba(176, 38, 255, 0.6));
    animation: gradient-shift 3s ease-in-out infinite, text-glitch 5s steps(2, start) infinite;
}

@keyframes gradient-shift {
    0%, 100% {
        filter: drop-shadow(0 0 20px rgba(0, 217, 255, 0.8)) 
                drop-shadow(0 0 40px rgba(176, 38, 255, 0.6));
    }
    50% {
        filter: drop-shadow(0 0 30px rgba(176, 38, 255, 0.8)) 
                drop-shadow(0 0 50px rgba(0, 217, 255, 0.6));
    }
}

@keyframes text-glitch {
    0%, 90%, 100% {
        transform: translate(0);
    }
    92% {
        transform: translate(-2px, 2px);
    }
    94% {
        transform: translate(2px, -2px);
    }
    96% {
        transform: translate(-2px, -2px);
    }
}

.gradient-text::after {
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background: var(--gradient-neon);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: blur(30px);
    opacity: 0.8;
    animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    animation: fadeIn 1s ease 0.8s forwards;
    font-weight: 400;
    letter-spacing: 0.5px;
}

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

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeIn 1s ease 1s forwards;
}

/* ==================== 按钮样式 - 霓虹按钮 ==================== */
.btn {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: 2px solid;
    border-radius: 0;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn span {
    position: relative;
    z-index: 2;
}

.btn-primary {
    background: rgba(43, 122, 155, 0.1);
    color: var(--cyber-cyan);
    border-color: var(--cyber-cyan);
    box-shadow: var(--shadow-neon), inset 0 0 20px rgba(43, 122, 155, 0.08);
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-cyber);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-neon-strong), inset 0 0 40px rgba(43, 122, 155, 0.2);
    color: #fff;
    background: var(--gradient-cyber);
    text-shadow: 0 0 10px rgba(43, 122, 155, 0.8);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(0, 217, 255, 0.6) 0%, transparent 70%);
    border-radius: 50%;
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover .btn-glow {
    width: 300px;
    height: 300px;
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--text-secondary);
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.btn-secondary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-hologram);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.btn-secondary:hover {
    border-color: var(--cyber-cyan);
    color: var(--cyber-cyan);
    box-shadow: var(--shadow-neon);
    text-shadow: 0 0 10px rgba(43, 122, 155, 0.6);
    transform: translateY(-3px);
}

.btn-secondary:hover::before {
    opacity: 1;
}

/* ==================== 滚动指示器 ==================== */
.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    animation: fadeIn 1s ease 1.5s forwards, bounce 2s ease-in-out 2s infinite;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.scroll-indicator:hover {
    transform: translateX(-50%) scale(1.1);
}

.scroll-indicator:hover .mouse {
    border-color: var(--primary-light);
}

.scroll-indicator:hover .wheel {
    background: var(--primary-light);
}

.scroll-indicator:hover .arrow span {
    border-color: var(--primary-light);
    animation: arrow-move-fast 0.8s ease-in-out infinite;
}

@keyframes arrow-move-fast {
    0%, 100% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
}

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

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--text-secondary);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 10px;
    background: var(--text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(15px);
    }
}

.arrow {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.arrow span {
    width: 12px;
    height: 12px;
    border-bottom: 2px solid var(--text-secondary);
    border-right: 2px solid var(--text-secondary);
    transform: rotate(45deg);
    animation: arrow-move 1.5s ease-in-out infinite;
}

.arrow span:nth-child(2) {
    animation-delay: 0.15s;
}

.arrow span:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes arrow-move {
    0%, 100% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
}

/* ==================== 产品部分 ==================== */
.products {
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    font-family: 'Orbitron', 'Microsoft YaHei', sans-serif;
    text-transform: uppercase;
    letter-spacing: 4px;
}

.title-decorator {
    width: 60px;
    height: 3px;
    background: var(--gradient-cyber);
    box-shadow: var(--shadow-neon);
    position: relative;
    overflow: hidden;
}

.title-decorator::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
    animation: decorator-shine 2s linear infinite;
}

@keyframes decorator-shine {
    0% { left: -100%; }
    100% { left: 100%; }
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2.5rem;
    margin-top: var(--spacing-lg);
}

/* ==================== 极简产品卡片 ==================== */
.product-card-clean {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(30px);
    border-radius: 24px;
    padding: 3.5rem 2.5rem;
    border: 1px solid rgba(43, 122, 155, 0.12);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.product-card-clean:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(43, 122, 155, 0.15);
    border-color: rgba(43, 122, 155, 0.25);
}

.product-card-clean.featured {
    border: 2px solid rgba(212, 175, 55, 0.25);
    background: linear-gradient(135deg, rgba(255,255,255,0.98) 0%, rgba(255,250,240,0.98) 100%);
}

.product-card-clean.featured:hover {
    box-shadow: 0 25px 70px rgba(212, 175, 55, 0.2);
    border-color: rgba(212, 175, 55, 0.4);
}

/* 产品图标区域 */
.product-icon-large {
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: center;
}

.icon-circle {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(43, 122, 155, 0.08) 0%, rgba(43, 122, 155, 0.12) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.4s ease;
}

.product-card-clean:hover .icon-circle {
    background: linear-gradient(135deg, rgba(43, 122, 155, 0.12) 0%, rgba(43, 122, 155, 0.18) 100%);
    box-shadow: 0 10px 40px rgba(43, 122, 155, 0.2);
}

.icon-circle.premium {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1) 0%, rgba(244, 228, 166, 0.15) 100%);
}

.product-card-clean.featured:hover .icon-circle.premium {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.15) 0%, rgba(244, 228, 166, 0.2) 100%);
    box-shadow: 0 10px 40px rgba(212, 175, 55, 0.25);
}

/* 产品主图 */
.product-main-img {
    max-width: 120px;
    height: auto;
    filter: drop-shadow(0 8px 20px rgba(43, 122, 155, 0.25));
    animation: float-soft 4s ease-in-out infinite;
}

@keyframes float-soft {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* 简化的USB图标 */
.usb-simple-icon {
    position: relative;
    width: 90px;
    height: 90px;
}

.usb-body {
    width: 70px;
    height: 45px;
    background: linear-gradient(135deg, #156082 0%, #2b7a9b 100%);
    border-radius: 10px;
    position: absolute;
    bottom: 10px;
    left: 10px;
    box-shadow: 0 8px 25px rgba(43, 122, 155, 0.35);
}

.usb-port {
    width: 28px;
    height: 18px;
    background: linear-gradient(180deg, #2b7a9b 0%, #1a5f7e 100%);
    border-radius: 5px;
    position: absolute;
    top: 5px;
    left: 31px;
    box-shadow: 0 4px 12px rgba(43, 122, 155, 0.3);
}

.usb-contact {
    width: 14px;
    height: 6px;
    background: #d4af37;
    position: absolute;
    top: 0;
    left: 38px;
    border-radius: 2px 2px 0 0;
}

.usb-body::after {
    content: '';
    width: 8px;
    height: 8px;
    background: #00d9ff;
    border-radius: 50%;
    position: absolute;
    top: 12px;
    left: 12px;
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.9);
    animation: pulse-led 2s ease-in-out infinite;
}

@keyframes pulse-led {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

/* 简化的双头图标 */
.dual-simple-icon {
    position: relative;
    width: 100px;
    height: 90px;
}

.dual-main {
    width: 50px;
    height: 35px;
    background: linear-gradient(135deg, #156082 0%, #3d6b7d 100%);
    border-radius: 8px;
    position: absolute;
    top: 30px;
    left: 25px;
    box-shadow: 0 8px 25px rgba(43, 122, 155, 0.35);
}

.dual-port {
    width: 18px;
    height: 14px;
    background: linear-gradient(180deg, #2b7a9b 0%, #1a5f7e 100%);
    border-radius: 4px;
    position: absolute;
    top: 10px;
    box-shadow: 0 4px 12px rgba(43, 122, 155, 0.3);
}

.dual-port.left {
    left: 8px;
}

.dual-port.right {
    right: 8px;
}

.dual-port::before {
    content: '';
    width: 9px;
    height: 4px;
    background: #d4af37;
    position: absolute;
    top: -4px;
    left: 4.5px;
    border-radius: 2px 2px 0 0;
}

.dual-indicator {
    width: 6px;
    height: 6px;
    background: #00d9ff;
    border-radius: 50%;
    position: absolute;
    top: 45px;
    box-shadow: 0 0 18px rgba(0, 217, 255, 0.9);
}

.dual-indicator.left {
    left: 32px;
    animation: pulse-led 1.8s ease-in-out infinite;
}

.dual-indicator.right {
    right: 32px;
    animation: pulse-led 1.8s ease-in-out infinite 0.9s;
}

.dual-main::after {
    content: '×2';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.9);
    font-family: 'Orbitron', sans-serif;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* 产品名称 */
.product-name {
    font-size: 2rem;
    font-weight: 700;
    color: #156082;
    margin: 0 0 1.5rem 0;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    letter-spacing: 0.02em;
}

/* 产品描述 */
.product-description {
    font-size: 0.95rem;
    line-height: 1.8;
    color: #4b5563;
    margin: 0;
    max-width: 90%;
    margin-left: auto;
    margin-right: auto;
}

.product-card-modern::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #156082, #2b7a9b, #3d6b7d);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card-modern:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(43, 122, 155, 0.2);
    border-color: rgba(43, 122, 155, 0.3);
}

.product-card-modern:hover::before {
    opacity: 1;
}

/* 旗舰款特殊样式 */
.product-card-modern.featured {
    background: linear-gradient(135deg, rgba(255,255,255,0.98) 0%, rgba(244,228,166,0.1) 100%);
    border: 2px solid rgba(212, 175, 55, 0.3);
}

.product-card-modern.featured::before {
    background: linear-gradient(90deg, #d4af37, #f4e4a6, #d4af37);
}

.product-card-modern.featured:hover {
    box-shadow: 0 25px 70px rgba(212, 175, 55, 0.25);
    border-color: rgba(212, 175, 55, 0.5);
}

/* 旗舰角标 */
.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #d4af37, #f4e4a6);
    color: #1a1f35;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
    animation: badge-pulse 2s ease-in-out infinite;
}

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

/* 产品头部 */
.product-header {
    text-align: left;
    margin-bottom: 2rem;
}

.product-label {
    display: inline-block;
    background: rgba(43, 122, 155, 0.1);
    color: #2b7a9b;
    padding: 0.35rem 0.8rem;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
}

.product-label.premium {
    background: linear-gradient(135deg, rgba(212,175,55,0.2), rgba(244,228,166,0.2));
    color: #b8941e;
}

.product-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0.5rem 0;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
}

.product-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* 产品视觉区域 */
.product-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 180px;
    margin: 2rem 0;
    position: relative;
}

.product-img {
    max-width: 160px;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(43, 122, 155, 0.3));
    animation: float-gentle 4s ease-in-out infinite;
}

@keyframes float-gentle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* USB设备图标 - 纯CSS */
.usb-device-icon {
    position: relative;
    width: 120px;
    height: 100px;
}

.device-body {
    width: 80px;
    height: 50px;
    background: linear-gradient(135deg, #156082 0%, #2b7a9b 100%);
    border-radius: 8px;
    position: absolute;
    bottom: 0;
    left: 20px;
    box-shadow: 0 10px 30px rgba(43, 122, 155, 0.3);
}

.device-connector {
    width: 30px;
    height: 20px;
    background: #2b7a9b;
    border-radius: 4px;
    position: absolute;
    top: 0;
    left: 45px;
    box-shadow: 0 5px 15px rgba(43, 122, 155, 0.2);
}

.device-connector::before {
    content: '';
    width: 14px;
    height: 5px;
    background: #c9b382;
    position: absolute;
    top: -5px;
    left: 8px;
    border-radius: 2px;
}

.device-led {
    width: 8px;
    height: 8px;
    background: #00d9ff;
    border-radius: 50%;
    position: absolute;
    bottom: 15px;
    left: 30px;
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.8);
    animation: led-blink 2s ease-in-out infinite;
}

@keyframes led-blink {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* 双头设备图标 */
.dual-device-icon {
    position: relative;
    width: 140px;
    height: 100px;
}

.dual-device-body {
    width: 60px;
    height: 40px;
    background: linear-gradient(135deg, #156082 0%, #3d6b7d 100%);
    border-radius: 6px;
    position: absolute;
    top: 30px;
    left: 40px;
    box-shadow: 0 10px 30px rgba(43, 122, 155, 0.3);
}

.dual-connector {
    width: 20px;
    height: 15px;
    background: #2b7a9b;
    border-radius: 3px;
    position: absolute;
    top: 15px;
    box-shadow: 0 5px 15px rgba(43, 122, 155, 0.2);
}

.dual-connector.left {
    left: 15px;
}

.dual-connector.right {
    right: 15px;
}

.dual-connector::before {
    content: '';
    width: 10px;
    height: 4px;
    background: #c9b382;
    position: absolute;
    top: -4px;
    left: 5px;
    border-radius: 2px;
}

.dual-led {
    width: 6px;
    height: 6px;
    background: #00d9ff;
    border-radius: 50%;
    position: absolute;
    top: 45px;
    box-shadow: 0 0 15px rgba(0, 217, 255, 0.8);
}

.dual-led.left {
    left: 50px;
    animation: led-blink 1.5s ease-in-out infinite;
}

.dual-led.right {
    right: 50px;
    animation: led-blink 1.5s ease-in-out infinite 0.75s;
}

.dual-label {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.2rem;
    font-weight: 700;
    color: #156082;
    font-family: 'Orbitron', sans-serif;
}

/* 规格列表 */
.product-specs-list {
    margin: 2rem 0;
    border-top: 1px solid rgba(43, 122, 155, 0.1);
    padding-top: 1.5rem;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(43, 122, 155, 0.08);
}

.spec-row:last-child {
    border-bottom: none;
}

.spec-key {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.spec-val {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
}

.spec-row.highlight .spec-val {
    color: #2b7a9b;
    text-shadow: 0 0 10px rgba(43, 122, 155, 0.2);
}

/* 产品标签 */
.product-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.product-tags .tag {
    flex: 1;
    min-width: fit-content;
    padding: 0.5rem 0.8rem;
    background: rgba(43, 122, 155, 0.08);
    border: 1px solid rgba(43, 122, 155, 0.2);
    border-radius: 8px;
    font-size: 0.75rem;
    color: #2b7a9b;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
}

.product-tags .tag:hover {
    background: rgba(43, 122, 155, 0.15);
    border-color: rgba(43, 122, 155, 0.4);
    transform: translateY(-2px);
}

/* 产品按钮 */
.product-btn {
    width: 100%;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, #156082 0%, #2b7a9b 100%);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(43, 122, 155, 0.3);
}

.product-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(43, 122, 155, 0.4);
}

.product-btn svg {
    transition: transform 0.3s ease;
}

.product-btn:hover svg {
    transform: translateX(4px);
}

.product-btn.premium {
    background: linear-gradient(135deg, #d4af37 0%, #f4e4a6 50%, #d4af37 100%);
    color: #1a1f35;
    box-shadow: 0 4px 20px rgba(212, 175, 55, 0.4);
}

.product-btn.premium:hover {
    box-shadow: 0 8px 30px rgba(212, 175, 55, 0.5);
}

.product-card {
    perspective: 1000px;
    height: var(--product-card-height); /* 使用变量控制高度 */
    position: relative;
    transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
    transform-origin: center center;
}

.product-card:hover .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex; /* 改为 Flexbox 布局 */
    flex-direction: column; /* 垂直排列 */
    justify-content: flex-start; /* 从顶部开始排列 */
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(12px) saturate(150%);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--shi-qing-border);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
    text-align: center;
    overflow: hidden;
}

.card-content {
    flex-grow: 1; /* 占据所有可用空间 */
    display: flex;
    flex-direction: column;
    justify-content: center; /* 垂直居中 */
}

.card-front::before,
.card-back::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-neon);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.product-card:hover .card-front::before,
.product-card:hover .card-back::before {
    opacity: 0.3;
    animation: border-rotate 4s linear infinite;
}

@keyframes border-rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.card-back {
    transform: rotateY(180deg);
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(43, 122, 155, 0.5);
}

.card-image {
    margin-bottom: var(--spacing-md);
    min-height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* SVG图标样式 */
.product-svg-icon {
    width: 140px;
    height: 140px;
    filter: drop-shadow(0 0 20px rgba(43, 122, 155, 0.4));
    animation: float 3s ease-in-out infinite;
    transition: all 0.3s ease;
}

.product-card:hover .product-svg-icon {
    filter: drop-shadow(0 0 30px rgba(43, 122, 155, 0.6));
    transform: scale(1.05);
}

/* 产品角标 */
.product-badge {
    position: absolute;
    top: -10px;
    right: -10px;
    padding: 0.4rem 1rem;
    background: linear-gradient(135deg, #156082 0%, #2b7a9b 100%);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(43, 122, 155, 0.4);
    z-index: 10;
    letter-spacing: 0.05em;
}

.product-badge.featured {
    background: linear-gradient(135deg, #d4af37 0%, #f4e4a6 50%, #d4af37 100%);
    color: #1a1f35;
    box-shadow: 0 4px 20px rgba(212, 175, 55, 0.5);
    animation: badge-glow 2s ease-in-out infinite;
}

@keyframes badge-glow {
    0%, 100% {
        box-shadow: 0 4px 20px rgba(212, 175, 55, 0.5);
    }
    50% {
        box-shadow: 0 4px 30px rgba(212, 175, 55, 0.8);
    }
}

.product-icon {
    font-size: 5rem;
    filter: drop-shadow(0 0 30px rgba(0, 217, 255, 0.8)) 
            drop-shadow(0 0 50px rgba(0, 217, 255, 0.5));
    animation: float 3s ease-in-out infinite, icon-glow 2s ease-in-out infinite;
}

.product-image {
    max-width: 180px;
    max-height: 180px;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 0 20px rgba(43, 122, 155, 0.6)) 
            drop-shadow(0 0 40px rgba(43, 122, 155, 0.4));
    animation: float 3s ease-in-out infinite, image-glow 2s ease-in-out infinite;
    display: block;
    margin: 0 auto;
}

.product-card:hover .product-image {
    filter: drop-shadow(0 0 30px rgba(43, 122, 155, 0.8)) 
            drop-shadow(0 0 60px rgba(43, 122, 155, 0.6));
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-12px);
    }
}

@keyframes image-glow {
    0%, 100% {
        filter: drop-shadow(0 0 10px rgba(43, 122, 155, 0.2)) 
                drop-shadow(0 0 20px rgba(43, 122, 155, 0.1));
    }
    50% {
        filter: drop-shadow(0 0 25px rgba(43, 122, 155, 0.5)) 
                drop-shadow(0 0 50px rgba(43, 122, 155, 0.3));
    }
}

@keyframes icon-glow {
    0%, 100% {
        filter: drop-shadow(0 0 30px rgba(0, 217, 255, 0.8)) 
                drop-shadow(0 0 50px rgba(0, 217, 255, 0.5));
    }
    50% {
        filter: drop-shadow(0 0 50px rgba(176, 38, 255, 0.8)) 
                drop-shadow(0 0 70px rgba(176, 38, 255, 0.5));
    }
}

.card-front h3 {
    font-size: 1.8rem; /* 适当调整字体大小 */
    margin-top: 0;
    margin-bottom: 0.5rem; /* 调整间距 */
    color: var(--text-primary);
    font-weight: 700;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    text-shadow: var(--shadow-text-neon);
    letter-spacing: 0.05em;
}

.card-subtitle {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 规格简介容器 */
.card-specs-brief {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
    padding: 1rem;
    background: rgba(43, 122, 155, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(43, 122, 155, 0.2);
}

.spec-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}

.spec-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.spec-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
}

.spec-value.highlight {
    color: #2b7a9b;
    text-shadow: 0 0 10px rgba(43, 122, 155, 0.3);
}

/* 旗舰款特殊样式 */
.product-card.featured .card-front {
    border: 2px solid rgba(212, 175, 55, 0.3);
    box-shadow: 0 10px 40px rgba(212, 175, 55, 0.2), 
                0 0 0 1px rgba(212, 175, 55, 0.1);
}

.product-card.featured:hover .card-front {
    border-color: rgba(212, 175, 55, 0.5);
    box-shadow: 0 15px 50px rgba(212, 175, 55, 0.3), 
                0 0 0 2px rgba(212, 175, 55, 0.2);
}

.card-features {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 100%;
    margin-top: auto; /* 关键：将此容器推到卡片底部 */
}

.feature-tag {
    flex: 1;
    padding: 0.6rem 0.8rem;
    background: var(--shi-qing-bg);
    border: 2px solid rgba(43, 122, 155, 0.8);
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--text-accent);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-normal);
    box-sizing: border-box;
    white-space: nowrap;
    box-shadow: 0 0 10px rgba(43, 122, 155, 0.3), inset 0 0 10px rgba(43, 122, 155, 0.1);
    min-width: 0; /* 允许flex收缩 */
}

.feature-tag:hover {
    background: rgba(43, 122, 155, 0.15);
    border-color: rgba(43, 122, 155, 1); /* 悬停时边框更加明显 */
    box-shadow: 0 0 25px rgba(43, 122, 155, 0.6), inset 0 0 15px rgba(43, 122, 155, 0.2); /* 增强光晕效果 */
    transform: translateY(-2px);
}

.specs {
    list-style: none;
    text-align: left;
    margin: var(--spacing-md) 0;
    flex: 1;
}

.specs li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 1.1rem;
    position: relative;
    padding-left: 1.5rem;
}

.specs li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--cyber-cyan);
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 217, 255, 0.8);
}

.btn-card {
    padding: 0.8rem 2rem;
    background: var(--gradient-primary);
    border: none;
    border-radius: 25px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* ==================== 特性部分 ==================== */
.features {
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    border-radius: 0;
    border: 2px solid rgba(0, 195, 255, 0.4);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 0 20px rgba(0, 195, 255, 0.25);
    text-align: center;
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    min-height: 420px;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(
        from 0deg,
        transparent,
        rgba(0, 217, 255, 0.1),
        transparent 30%
    );
    animation: feature-rotate 4s linear infinite;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

@keyframes feature-rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.feature-item:hover::before {
    opacity: 1;
}

.feature-item[data-aos="fade-up"] {
    animation: fadeUpAnim 0.8s ease forwards;
}

@keyframes fadeUpAnim {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-item:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 195, 255, 0.7);
    box-shadow: var(--shadow-neon-strong), var(--shadow-dark);
}

.feature-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    filter: drop-shadow(0 0 20px rgba(0, 217, 255, 0.6)) 
            drop-shadow(0 0 40px rgba(0, 217, 255, 0.4));
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--cyber-cyan);
    font-family: 'Orbitron', 'Microsoft YaHei', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    position: relative;
    z-index: 1;
    margin-bottom: 0;
    flex-grow: 1;
    display: flex;
    align-items: center;
    text-align: center;
}

/* 特性卡片下载按钮 */
.feature-download-btn {
    display: inline-block;
    padding: 0.75rem 1.8rem;
    background: linear-gradient(135deg, #00c3ff 0%, #0088cc 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 195, 255, 0.3);
    margin-top: 1.5rem;
    flex-shrink: 0;
}

.feature-download-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.feature-download-btn:hover::before {
    width: 300px;
    height: 300px;
}

.feature-download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(0, 195, 255, 0.5);
}

/* ==================== 统计数据 ==================== */
.stats {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-cyber);
    box-shadow: var(--shadow-neon);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    position: relative;
}

.stat-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-hologram);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 10px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stat-item:hover::before {
    opacity: 1;
}

.stat-number {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    color: var(--cyber-cyan);
    margin-bottom: var(--spacing-sm);
    font-family: 'Orbitron', sans-serif;
    text-shadow: var(--shadow-neon);
    position: relative;
    z-index: 1;
}

.stat-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    position: relative;
    z-index: 1;
}

/* ==================== SDK部分 ==================== */
.sdk-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid rgba(43, 122, 155, 0.15);
}

.sdk-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #156082;
    text-align: center;
    margin-bottom: 1rem;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
}

.sdk-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== 开发文档 ==================== */
.docs {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
}

.docs-intro {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.doc-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    border: 2px solid rgba(168, 85, 247, 0.5);
    border-radius: 0;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
    position: relative;
    overflow: hidden;
}

.doc-card::before {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: conic-gradient(
        from 0deg,
        transparent,
        rgba(176, 38, 255, 0.15),
        transparent 20%
    );
    animation: doc-shine 5s linear infinite;
}

@keyframes doc-shine {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.doc-card[data-aos="fade-up"] {
    animation: fadeUpAnim 0.8s ease forwards;
}

.doc-card:hover {
    transform: translateY(-10px);
    border-color: rgba(168, 85, 247, 0.8);
    box-shadow: var(--shadow-purple), var(--shadow-dark);
}

.doc-icon {
    margin-bottom: var(--spacing-md);
}

.language-logo {
    font-size: 4rem;
    text-align: center;
    filter: drop-shadow(0 5px 15px rgba(99, 102, 241, 0.3));
}

.doc-card h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    text-align: center;
}

.doc-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.doc-features {
    background: rgba(99, 102, 241, 0.1);
    border-radius: 10px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.doc-feature-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.feature-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.feature-value {
    color: var(--primary-light);
    font-weight: 600;
}

.doc-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    align-items: center;
}

.btn-doc {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 12px;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    letter-spacing: 0.5px;
}

.btn-doc-primary {
    background: var(--gradient-cyber);
    color: white;
    box-shadow: 0 4px 15px rgba(43, 122, 155, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-doc-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-doc-primary:hover::before {
    width: 300px;
    height: 300px;
}

.btn-doc-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(43, 122, 155, 0.5);
}

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

.btn-doc-secondary:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* 快速开始 */
.quick-start {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.quick-start h3 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.quick-start-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.step-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

.step-content h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--primary-light);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 联系我们 ==================== */
.contact {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
}

/* QQ群卡片 */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.contact-card {
    position: relative;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(245, 250, 255, 0.95) 100%);
    backdrop-filter: blur(30px);
    border-radius: 24px;
    padding: 2.5rem 2rem;
    text-align: center;
    border: 2px solid rgba(43, 122, 155, 0.15);
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.08),
        0 0 0 1px rgba(255, 255, 255, 0.8) inset;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 20px 50px rgba(43, 122, 155, 0.15),
        0 0 0 1px rgba(255, 255, 255, 1) inset;
    border-color: rgba(43, 122, 155, 0.3);
}

.contact-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #2b7a9b 0%, #156082 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.4s ease;
    box-shadow: 
        0 8px 25px rgba(43, 122, 155, 0.3),
        0 0 0 8px rgba(43, 122, 155, 0.08);
}

.contact-card:hover .contact-icon {
    transform: scale(1.1) rotateY(360deg);
    box-shadow: 
        0 12px 35px rgba(43, 122, 155, 0.4),
        0 0 0 10px rgba(43, 122, 155, 0.12);
}

.qq-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: linear-gradient(135deg, rgba(43, 122, 155, 0.4), rgba(21, 96, 130, 0.4));
    border-radius: 50%;
    opacity: 0;
    transition: all 0.5s ease;
    z-index: -1;
}

.qq-group-card:hover .qq-icon {
    transform: scale(1.1) rotateZ(360deg);
    box-shadow: 
        0 15px 50px rgba(43, 122, 155, 0.5),
        0 0 0 15px rgba(43, 122, 155, 0.12);
}

.qq-group-card:hover .qq-icon::before {
    opacity: 1;
    width: 140%;
    height: 140%;
}

.contact-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #156082;
    margin: 0 0 1.5rem 0;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    letter-spacing: 0.05em;
}

.contact-desc {
    color: #6b7280;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.qq-number-box {
    background: linear-gradient(135deg, rgba(43, 122, 155, 0.06) 0%, rgba(43, 122, 155, 0.12) 100%);
    border: 2px solid rgba(43, 122, 155, 0.2);
    border-radius: 16px;
    padding: 1.2rem 1.5rem;
    margin: 1.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.qq-number-box:hover {
    background: linear-gradient(135deg, rgba(43, 122, 155, 0.1) 0%, rgba(43, 122, 155, 0.16) 100%);
    border-color: rgba(43, 122, 155, 0.3);
}

.qq-number {
    font-size: 1.4rem;
    font-weight: 800;
    color: #2b7a9b;
    font-family: 'Orbitron', monospace;
    letter-spacing: 0.05em;
    text-shadow: 0 2px 10px rgba(43, 122, 155, 0.15);
    user-select: all;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    background: linear-gradient(135deg, #2b7a9b 0%, #156082 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(43, 122, 155, 0.3);
    position: relative;
    overflow: hidden;
}

.copy-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transition: width 0.5s ease, height 0.5s ease;
}

.copy-btn:hover::before {
    width: 200px;
    height: 300px;
}

.qq-copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(43, 122, 155, 0.5);
}

.qq-copy-btn:active {
    transform: translateY(0);
}

.qq-copy-btn svg {
    position: relative;
    z-index: 1;
}

.qq-copy-btn span {
    position: relative;
    z-index: 1;
}

.contact-tags {
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.contact-tag {
    padding: 0.5rem 1rem;
    background: rgba(43, 122, 155, 0.08);
    border: 1.5px solid rgba(43, 122, 155, 0.2);
    border-radius: 50px;
    font-size: 0.8rem;
    color: #156082;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.contact-tag:hover {
    background: rgba(43, 122, 155, 0.15);
    border-color: rgba(43, 122, 155, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(43, 122, 155, 0.2);
}

/* 淘宝购买按钮 */
.contact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.9rem 2rem;
    background: linear-gradient(135deg, #FF6A00 0%, #FF8C00 100%);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 700;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 
        0 4px 15px rgba(255, 106, 0, 0.35),
        0 0 0 0 rgba(255, 106, 0, 0.4);
    position: relative;
    overflow: hidden;
    margin-top: 1rem;
}

.contact-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    transition: width 0.5s ease, height 0.5s ease;
}

.contact-btn:hover::before {
    width: 300px;
    height: 300px;
}

.contact-btn:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 8px 25px rgba(255, 106, 0, 0.5),
        0 0 0 6px rgba(255, 106, 0, 0.15);
}

.contact-btn:active {
    transform: translateY(-1px);
}

.contact-btn svg {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.contact-btn:hover svg:last-child {
    transform: translate(2px, -2px);
}

.contact-btn span {
    position: relative;
    z-index: 1;
    letter-spacing: 0.05em;
}

@media (max-width: 768px) {
    .contact-cards {
        grid-template-columns: 1fr;
    }
    
    .feature-item {
        min-height: auto;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    border-radius: 0;
    border: 2px solid rgba(0, 195, 255, 0.4);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-normal);
}

.info-item:hover {
    transform: translateX(10px);
    border-color: rgba(0, 195, 255, 0.7);
    box-shadow: var(--shadow-neon);
}

.info-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--gradient-cyber);
    border-radius: 0;
    flex-shrink: 0;
    box-shadow: var(--shadow-neon);
}

.info-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
    color: var(--primary-light);
}

.info-item p {
    color: var(--text-secondary);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(0, 195, 255, 0.4);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-normal);
    font-family: 'Noto Sans SC', sans-serif;
}

.form-input:focus {
    outline: none;
    border-color: var(--cyber-cyan);
    box-shadow: var(--shadow-neon), inset 0 0 20px rgba(0, 195, 255, 0.15);
}

.form-input::placeholder {
    color: var(--text-muted);
}

textarea.form-input {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

/* ==================== Footer ==================== */
.footer {
    background: var(--bg-primary);
    padding: 2rem var(--spacing-md);
    border-top: 2px solid rgba(43, 122, 155, 0.1);
}

.footer-simple {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-simple p {
    margin: 0;
    padding: 0.5rem 0;
}

.footer-simple a {
    color: #00c3ff;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
}

.footer-simple a:hover {
    color: #0088cc;
    text-decoration: underline;
}

/* ==================== 产品卡片 3D 效果 (仅大屏) ==================== */
@media (min-width: 969px) {
    .products-grid {
        /* 强制 3 列布局以实现 3D 效果 */
        grid-template-columns: repeat(3, 1fr);
        /* 创建统一的 3D 视觉空间 */
        perspective: 2500px;
        /* 为旋转的卡片留出空间 */
        padding: 0 var(--spacing-md);
    }

    .product-card {
        z-index: 1;
    }

    .product-card:nth-child(1) {
        transform: translateX(-9%) rotateY(16deg) scale(0.9);
    }
    
    .product-card:nth-child(2) {
        /* 突出中间卡片 */
        transform: scale(1.05);
        z-index: 10;
    }

    .product-card:nth-child(3) {
        transform: translateX(9%) rotateY(-16deg) scale(0.9);
    }

    .product-card:hover {
        /* 鼠标悬停时，将卡片拉近并摆正 */
        transform: scale(1.1) rotateY(0);
        z-index: 20;
        box-shadow: var(--shadow-card-hover);
    }

    /* 当鼠标在整个网格上时，让未悬停的卡片稍微退后 */
    .products-grid:hover .product-card:not(:hover) {
        transform: scale(0.88);
        opacity: 0.8;
    }

    /* 恢复未悬停卡片的3D位置 */
    .products-grid:hover .product-card:not(:hover):nth-child(1) {
        transform: translateX(-9%) rotateY(16deg) scale(0.88);
    }

    .products-grid:hover .product-card:not(:hover):nth-child(3) {
        transform: translateX(9%) rotateY(-16deg) scale(0.88);
    }
}


/* ==================== 响应式设计 ==================== */
@media (max-width: 968px) {
    .nav-container {
        grid-template-columns: 1fr auto;
        gap: 1rem;
        padding: 0.8rem 1.5rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: rgba(245, 245, 240, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        padding: 2rem;
        gap: 0;
        transition: left var(--transition-normal);
        border-top: 2px solid var(--ink-gray);
        box-shadow: 0 8px 16px rgba(26, 26, 26, 0.15);
    }
    
    .nav-menu li:not(:last-child)::after {
        display: none;
    }
    
    .nav-link {
        width: 100%;
        text-align: left;
        padding: 1.2rem 1.5rem;
        border-bottom: 2px solid var(--ink-gray);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .docs-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-start-steps {
        grid-template-columns: 1fr;
    }
    
    .contact-content,
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==================== 动画效果 ==================== */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

/* 滚动触发动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 加载动画 */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.loading {
    animation: shimmer 2s infinite;
    background: linear-gradient(to right, var(--bg-card) 4%, rgba(255, 255, 255, 0.1) 25%, var(--bg-card) 36%);
    background-size: 1000px 100%;
}