/* CSS Variables */
:root {
    --container-max: 1280px;
    --container-max-xl: 1400px;
    --space-hero-top: clamp(72px, 8vh, 112px);
    --space-hero-bottom: clamp(48px, 7vh, 80px);
}

/* 重置样式和基本设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: 24px;
}

@media (min-width: 768px) {
    .container {
        padding-inline: 32px;
    }
}

@media (min-width: 1280px) {
    .container {
        max-width: var(--container-max-xl);
        padding-inline: 40px;
    }
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 72px;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(140%) blur(8px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

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

.header .nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.header .nav a {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    transition: color 0.2s ease;
}

.header .nav a:hover {
    color: #1f2937;
}

.brand {
    font-size: 20px;
    font-weight: 700;
    color: #111827;
    text-decoration: none;
}

.lang-switch {
    position: relative;
    z-index: 2;
    margin-left: 16px;
}

.lang-dropdown {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 4px 8px;
    font-size: 14px;
    cursor: pointer;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-en {
    display: block;
    font-size: 0.8rem;
    margin-top: -5px;
    opacity: 0.8;
}

.language-switcher {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    gap: 5px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 25px;
    padding: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

/* 顶部语言下拉样式 */
.lang-select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    padding: 8px 36px 8px 12px;
    border-radius: 20px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background:
        rgba(255, 255, 255, 0.95)
        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="%23666" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>')
        no-repeat right 12px center / 12px;
    font-size: 0.9rem;
    font-weight: 500;
    color: #333;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-select:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.lang-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #666;
}

.lang-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.lang-btn:hover:not(.active) {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: #667eea;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: #333;
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* Hero Section */
.hero-split {
    background:
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 60%, rgba(118, 75, 162, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(19, 118, 255, 0.06) 0%, transparent 50%),
        linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 25%, #e8f0ff 50%, #f5f7fa 75%, #f3f3f3 100%);
    background-attachment: fixed;
    padding: clamp(40px, 7vh, 72px) 0;
    position: relative;
    overflow: hidden;
}

.hero-split::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: float-slow 20s ease-in-out infinite;
}

.hero-split::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.12) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: float-slow 25s ease-in-out infinite reverse;
}

@keyframes float-slow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-grid {
    display: grid;
    align-items: center;
    gap: 32px;
    grid-template-columns: 1.15fr 1.35fr;
    position: relative;
    z-index: 1;
}

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }
}

.hero-copy {
    position: relative;
    z-index: 2;
}

.hero-copy h1 {
    font-size: clamp(36px, 6vw, 64px);
    line-height: 1.05;
    letter-spacing: .2px;
    margin: 0 0 12px;
    color: #111827;
    text-shadow: 0 2px 4px rgba(102, 126, 234, 0.1);
}

.hero-sub {
    font-size: 18px;
    color: #4b5563;
    margin: 0 0 20px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1376ff 0%, #0f5dd6 100%);
    color: #fff;
    padding: 12px 22px;
    border-radius: 999px;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 6px 20px rgba(19, 118, 255, .35), 0 2px 8px rgba(19, 118, 255, .15);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0f5dd6 0%, #0a4aa8 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(19, 118, 255, .45), 0 4px 12px rgba(19, 118, 255, .2);
}

.hero-badges {
    display: flex;
    gap: 20px;
    margin-top: 18px;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    gap: 10px;
    align-items: center;
    color: #374151;
}

.badge .ico {
    width: 18px;
    height: 18px;
    border: 2px solid #374151;
    border-radius: 4px;
    display: inline-block;
}

.hero-visual {
    position: relative;
}

.hero-visual img {
    width: 100%;
    max-width: 820px;
    height: auto;
    object-fit: contain;
    display: block;
    margin-left: auto;
}

/* 产品特性标签 */
.feature-tag {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: #333;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all 0.3s ease;
    transform: scale(0.95);
    opacity: 0.9;
}

.feature-tag:hover {
    transform: scale(1.05);
    opacity: 1;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 1);
    color: #1376ff;
}

/* 特性标签位置 */
.tag-1 {
    top: 20%;
    left: 10%;
}

.tag-2 {
    top: 12%;
    right: 15%;
}

.tag-3 {
    bottom: 20%;
    left: 15%;
}

/* 移动端特性标签优化 */
@media (max-width: 768px) {
    .feature-tag {
        font-size: 12px;
        padding: 8px 12px;
    }
    
    .tag-1 {
        top: 15%;
        left: 5%;
    }
    
    .tag-2 {
        top: 8%;
        right: 5%;
    }
    
    .tag-3 {
        bottom: 15%;
        left: 8%;
    }
}

/* Technical Specifications */
.specs {
    padding: 64px 0 80px;
    background: linear-gradient(180deg, #ffffff, #f7f7fb);
}

.specs-grid {
    display: grid;
    gap: 32px;
    grid-template-columns: 1.1fr 1.2fr;
    align-items: start;
}

@media (max-width: 1024px) {
    .specs-grid {
        grid-template-columns: 1fr;
    }
}

.specs-media img,
.specs-video {
    width: 100%;
    height: auto;
    object-fit: cover;
    border-radius: 16px;
    box-shadow: 0 12px 30px rgba(17, 24, 39, .12);
}

.specs-video {
    max-height: 400px;
}

.specs-table .section-title {
    margin: 0 0 6px;
}

.section-sub {
    margin: 0 0 18px;
    color: #6b7280;
}

.specs-list {
    margin: 0;
}

.specs-list .row {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(0, 0, 0, .06);
}

.specs-list dt {
    font-weight: 600;
    color: #111827;
}

.specs-list dd {
    margin: 0;
    color: #374151;
}



.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(900px 500px at 20% 15%, rgba(255, 255, 255, 0.08), transparent 60%),
        radial-gradient(700px 400px at 80% 25%, rgba(255, 255, 255, 0.06), transparent 60%),
        radial-gradient(600px 400px at 20% 80%, rgba(255, 255, 255, 0.05), transparent 60%),
        linear-gradient(135deg, #0b1020 0%, #1b2240 45%, #3b1d63 100%);
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: white;
    z-index: 10;
    max-width: 800px;
    padding: 0 2rem;
    position: relative;
}

/* 玻璃卡片效果与英雄英文版排版 */
.hero-content {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

/* 极简产品图布局（Zcamp风格） */
.hero-content.minimal {
    background: transparent;
    border: none;
    box-shadow: none;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-visual { position: relative; display: inline-block; padding-top: clamp(48px, 12vh, 120px); padding-bottom: clamp(16px, 4vh, 56px); margin-bottom: clamp(24px, 6vh, 48px); }

.product-image {
    display: block;
    max-width: min(980px, 88vw);
    max-height: clamp(360px, 58vh, 700px);
    width: auto;
    height: auto;
    margin: 0 auto;
    filter: drop-shadow(0 50px 80px rgba(0,0,0,0.35)) drop-shadow(0 10px 20px rgba(0,0,0,0.25));
}

.visual-overlay {
    position: absolute;
    left: 50%;
    top: clamp(-6px, 1.5vh, 20px);
    transform: translateX(-50%);
    text-align: center;
    width: 100%;
    pointer-events: none;
}

.visual-title {
    font-size: clamp(2.1rem, 5.2vw, 3.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.04;
    color: #ffffff;
    text-shadow: 0 8px 32px rgba(0,0,0,0.35), 0 2px 8px rgba(0,0,0,0.25);
    margin-bottom: 0.8rem;
}

.visual-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.3rem);
    font-weight: 300;
    color: rgba(255,255,255,0.9);
    margin-bottom: 2.2rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.35);
}

.hero-stats {
    margin-top: clamp(2.2rem, 6vh, 4rem);
    display: grid;
    grid-template-columns: repeat(3, minmax(240px, 1fr));
    gap: clamp(1.2rem, 2.6vw, 1.8rem);
    color: rgba(255,255,255,0.92);
    font-size: clamp(1rem, 1.6vw, 1.15rem);
    max-width: min(1040px, 92vw);
    margin-left: auto;
    margin-right: auto;
    align-items: stretch;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 1rem 1.2rem;
    border-radius: 14px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.18);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 18px 40px rgba(0,0,0,0.25);
}

.stat-icon { opacity: 0.9; font-size: 1.1em; }

.stat-sep { opacity: 0.5; margin: 0 6px; }

.hero-headline {
    font-size: clamp(2.4rem, 6.2vw, 4.8rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.08;
    margin-bottom: 1.1rem;
    background: linear-gradient(135deg, #ffffff 0%, #c7d2fe 40%, #e9d5ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 6px 30px rgba(102, 126, 234, 0.25);
}

.hero-subheadline {
    font-size: clamp(1rem, 2.3vw, 1.4rem);
    font-weight: 300;
    color: rgba(255, 255, 255, 0.92);
    margin: 0 auto 1.8rem auto;
    max-width: 950px;
}

.hero-bullets {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.2rem;
}

.bullet-sep { opacity: 0.5; }

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.hero-cta a { text-decoration: none; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 999px;
    font-size: 1.05rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 12px 30px rgba(102, 126, 234, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.floating-shape {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 100px;
    height: 100px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 80px;
    height: 80px;
    bottom: 30%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1s ease-out;
}

.hero-title-en {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-title-el {
    font-size: 2rem;
    font-weight: 500;
    margin-bottom: 2rem;
    opacity: 0.8;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    line-height: 1.8;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.4);
    animation: fadeInUp 1s ease-out 0.8s both;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.6);
}

.cta-button i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.scroll-line {
    width: 2px;
    height: 50px;
    background: rgba(255, 255, 255, 0.6);
    position: relative;
    animation: scrollIndicator 2s infinite;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: white;
    animation: scrollMove 2s infinite;
}

@keyframes scrollIndicator {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes scrollMove {
    0% { top: 0; opacity: 1; }
    100% { top: 30px; opacity: 0; }
}

@keyframes slideDown {
    0% {
        opacity: 0;
        transform: translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 通用区段样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 特色功能区域 */
.features-section {
    padding: 120px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
}

/* Section Styles */
.section-title {
    text-align: center;
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 800;
    margin: 0 0 6px;
    color: #5a58ff;
}

.section-sub {
    text-align: center;
    opacity: .65;
    margin: 0 0 28px;
}

/* Effects Section */
.effects {
    padding: 56px 0;
}

.effects-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .effects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .effects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.fx-card {
    background: #fff;
    border-radius: 24px;
    padding: 18px;
    box-shadow: 0 10px 30px rgba(18, 28, 45, .08);
    transition: transform .25s ease, box-shadow .25s ease;
}

.fx-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(18, 28, 45, .12);
}

.fx-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 4/3;
    object-fit: cover;
    border-radius: 18px;
    display: block;
    margin-bottom: 14px;
}

.fx-card h3 {
    margin: 0;
    font-size: 18px;
    color: #111827;
    font-weight: 600;
}

/* Key Advantages Section */
.advantages {
    padding: 56px 0;
}

.adv-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: 1fr;
}

@media (min-width: 768px) {
    .adv-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .adv-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.adv-card {
    background: #fff;
    border-radius: 20px;
    padding: 22px;
    box-shadow: 0 10px 30px rgba(16, 24, 40, .06);
    transition: transform .2s ease, box-shadow .2s ease;
}

.adv-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 16px 36px rgba(16, 24, 40, .1);
}

.adv-card i {
    display: inline-block;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #756bff, #5a58ff);
    margin-bottom: 12px;
}

.adv-card h3 {
    margin: 0 0 6px;
    font-size: 18px;
    font-weight: 700;
    color: #111827;
}

.adv-card p {
    margin: 0;
    color: #4b5563;
    line-height: 1.6;
}

/* Models slider */
.models-slider {
    position: relative;
    margin-top: 2rem;
}

.models-track {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(300px, 1fr);
    gap: 1.5rem;
    overflow: hidden;
    scroll-behavior: smooth;
}

.models-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    cursor: pointer;
    z-index: 2;
}

.models-nav.prev { left: -10px; }
.models-nav.next { right: -10px; }

.model-card {
    background: #fff;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    min-height: 420px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.model-card img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: contain;
}
.model-meta { color: #556; font-size: 0.95rem; margin-bottom: 8px; }
.model-highlights { margin-left: 1rem; color: #444; }
.model-highlights li { margin-bottom: 6px; }

@media (max-width: 768px) {
    .models-track { grid-auto-columns: 85%; }
    .models-nav.prev { left: 4px; }
    .models-nav.next { right: 4px; }
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(180deg, transparent 0%, #f8fafc 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(102, 126, 234, 0.2);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-card h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.8;
}

/* 技术规格区域 */
.specs-section {
    padding: 100px 0;
    background: white;
}

.specs-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.specs-image {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.specs-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.specs-image:hover img {
    transform: scale(1.05);
}

.specs-image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(102, 126, 234, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
}

.specs-image:hover .specs-image-overlay {
    opacity: 1;
}

.play-button {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #667eea;
    cursor: pointer;
    transition: all 0.3s ease;
}

.play-button:hover {
    transform: scale(1.1);
}

.specs-details .section-title {
    text-align: left;
    margin-bottom: 1rem;
}

.specs-details .section-subtitle {
    text-align: left;
    margin-bottom: 3rem;
}

.specs-list {
    display: grid;
    gap: 1.5rem;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.spec-item:hover {
    padding-left: 10px;
    border-color: #667eea;
}

.spec-label {
    font-weight: 600;
    color: #333;
}

.spec-value {
    font-weight: 500;
    color: #667eea;
}

/* 联系区域 */
.contact-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.contact-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

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

.contact-info .section-title,
.contact-info .section-subtitle {
    color: white;
    text-align: left;
}

.contact-info .section-title {
    background: white;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-details {
    margin-top: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    color: white;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.contact-item h4 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.contact-item p {
    opacity: 0.9;
}

/* 联系表单 */
.contact-form {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-group {
    position: relative;
    margin-bottom: 2rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: white;
    background: rgba(255, 255, 255, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.form-group label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
    pointer-events: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -0.5rem;
    left: 0.5rem;
    font-size: 0.8rem;
    background: rgba(102, 126, 234, 0.8);
    padding: 0.2rem 0.5rem;
    border-radius: 5px;
    color: white;
}

.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: white;
    color: #667eea;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* 页脚 */
.footer {
    background: #1a202c;
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(102, 126, 234, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: translateY(-3px);
}

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

.footer-section ul li {
    margin-bottom: 0.8rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: #667eea;
    padding-left: 5px;
}

.footer-language-switcher {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-lang-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.footer-lang-btn:hover {
    border-color: #667eea;
    color: #667eea;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    opacity: 0.8;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.6);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .specs-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0.8rem 1rem;
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        position: relative;
    }
    
    .logo {
        order: 1;
        flex: 1;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .logo-en {
        font-size: 0.7rem;
    }
    
    .language-switcher {
        position: relative;
        top: auto;
        right: auto;
        transform: none;
        order: 2;
        margin-left: auto;
        margin-right: 1rem;
    }
    
    .mobile-menu-btn {
        display: flex;
        order: 3;
        cursor: pointer;
        z-index: 1001;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 1.5rem;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
        border-radius: 0 0 15px 15px;
        z-index: 1000;
        order: 4;
        width: 100%;
        gap: 1rem;
        animation: slideDown 0.3s ease-out;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        padding: 0.8rem 0;
        border-bottom: 1px solid rgba(102, 126, 234, 0.1);
        text-align: center;
        font-size: 1rem;
    }
    
    .nav-links a:last-child {
        border-bottom: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-title-en {
        font-size: 1.8rem;
    }
    
    .hero-title-el {
        font-size: 1.4rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    .hero-headline { font-size: 2rem; }
    .hero-subheadline { font-size: 1rem; }
    .hero-bullets { font-size: 0.95rem; gap: 0.4rem 0.7rem; margin-bottom: 1.2rem; }
    .hero-stats { grid-template-columns: 1fr; gap: 0.8rem; }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .specs-image img {
        height: 300px;
    }
    
    .contact-form {
        padding: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .nav-container {
        padding: 0.5rem 0.8rem;
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .logo-en {
        font-size: 0.6rem;
    }
    
    .language-switcher {
        position: relative !important;
        top: auto !important;
        right: auto !important;
        transform: none !important;
        gap: 2px;
        padding: 3px;
        margin-left: auto;
        margin-right: 0.5rem;
        order: 2;
    }
    
    .lang-btn {
        padding: 4px 8px;
        font-size: 0.7rem;
        min-width: 32px;
    }
    
    .mobile-menu-btn {
        margin-left: 0.5rem;
    }
    
    .mobile-menu-btn span {
        width: 20px;
        height: 2px;
    }
    
    .nav-links {
        padding: 1rem;
        gap: 0.8rem;
    }
    
    .nav-links a {
        padding: 0.6rem 0;
        font-size: 0.9rem;
    }
    
    .hero-section { min-height: 100vh; padding: 0 1rem; }
    
    .hero-title {
        font-size: 1.8rem;
        margin-bottom: 0.3rem;
    }
    
    .hero-title-en {
        font-size: 1.2rem;
        margin-bottom: 0.3rem;
    }
    
    .hero-title-el {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
        margin-bottom: 2rem;
        line-height: 1.6;
    }
    
    .cta-button { padding: 12px 30px; font-size: 1rem; }

    .hero-headline { font-size: 1.6rem; margin-bottom: 0.6rem; }
    .hero-subheadline { font-size: 0.95rem; margin-bottom: 1rem; }
    .hero-bullets { font-size: 0.9rem; margin-bottom: 1rem; }
    .hero-cta .btn { padding: 12px 22px; font-size: 0.95rem; }
    .hero-stats { grid-template-columns: 1fr; gap: 0.7rem; }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 0.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
    
    .features-section,
    .specs-section,
    .contact-section {
        padding: 60px 0;
    }
    
    .features-grid {
        gap: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .feature-card h3 {
        font-size: 1.2rem;
        margin-bottom: 0.8rem;
    }
    
    .feature-card p {
        font-size: 0.9rem;
    }
    
    .specs-content {
        gap: 2rem;
    }
    
    .specs-image img {
        height: 250px;
    }
    
    .specs-list {
        gap: 1rem;
    }
    
    .spec-item {
        padding: 0.8rem 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }
    
    .spec-label {
        font-size: 0.9rem;
    }
    
    .spec-value {
        font-size: 0.9rem;
    }
    
    .contact-content {
        gap: 2rem;
    }
    
    .contact-item {
        margin-bottom: 1.5rem;
    }
    
    .contact-item i {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .contact-item h4 {
        font-size: 0.9rem;
    }
    
    .contact-item p {
        font-size: 0.9rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
    
    .form-group {
        margin-bottom: 1.5rem;
    }
    
    .form-group input,
    .form-group textarea {
        padding: 0.8rem;
        font-size: 0.9rem;
    }
    
    .form-group label {
        font-size: 0.8rem;
    }
    
    .submit-btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
    
    .footer-content {
        gap: 1.5rem;
    }
    
    .footer-section h3,
    .footer-section h4 {
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    
    .footer-section p,
    .footer-section ul li {
        font-size: 0.9rem;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    .floating-shape {
        display: none; /* 小屏幕隐藏装饰元素 */
    }
}

/* AOS动画链接 */
@import url('https://unpkg.com/aos@2.3.1/dist/aos.css');

/* 自定义AOS动画 */
[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos="fade-right"] {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-aos="fade-right"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

[data-aos="fade-left"] {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

[data-aos="fade-left"].aos-animate {
    opacity: 1;
    transform: translateX(0);
}

/* 加载动画 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 1;
    visibility: visible;
    transition: all 0.5s ease;
}

.loading.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-left: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 平滑滚动增强 */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* 高对比度支持 */
@media (prefers-contrast: high) {
    .navbar {
        background: rgba(255, 255, 255, 1);
        border-bottom: 2px solid #000;
    }
    
    .feature-card {
        border: 2px solid #000;
    }
}

/* 触摸设备优化 */
.touch-device .feature-card,
.touch-device .cta-button,
.touch-device .submit-btn,
.touch-device .lang-btn {
    transition: transform 0.1s ease;
}

.touch-device .feature-card:active,
.touch-device .cta-button:active,
.touch-device .submit-btn:active,
.touch-device .lang-btn:active {
    transform: scale(0.98);
}

/* 横屏移动端优化 */
.landscape-mobile .hero-section {
    height: 100vh;
    padding: 1rem;
}

.landscape-mobile .hero-title {
    font-size: 1.5rem;
}

.landscape-mobile .hero-title-en {
    font-size: 1rem;
}

.landscape-mobile .hero-title-el {
    font-size: 0.9rem;
}

.landscape-mobile .hero-subtitle {
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.landscape-mobile .section-title {
    font-size: 1.5rem;
}

/* 移动端菜单改进 */
@media (max-width: 768px) {
    .nav-links.active {
        animation: slideDown 0.3s ease-out forwards;
    }
    
    /* 防止菜单打开时页面滚动 */
    body.menu-open {
        overflow: hidden;
        position: fixed;
        width: 100%;
    }
}

/* 移动端滚动优化 */
@media (max-width: 768px) {
    .hero-section,
    .features-section,
    .specs-section,
    .contact-section {
        scroll-margin-top: 80px;
    }
    
    /* 优化滚动性能 */
    .feature-card,
    .spec-item,
    .contact-item {
        will-change: transform;
        transform: translateZ(0);
    }
}

/* 小屏幕专用优化 */
@media (max-width: 375px) {
    .container {
        padding: 0 10px;
    }
    
    .nav-container {
        padding: 0.5rem;
    }
    
    .hero-content {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 1.6rem;
    }
    
    .hero-subtitle {
        font-size: 0.8rem;
    }
    
    .cta-button {
        padding: 10px 25px;
        font-size: 0.9rem;
    }
    
    .language-switcher {
        margin-right: 0.3rem;
    }
    
    .lang-btn {
        padding: 3px 6px;
        font-size: 0.65rem;
        min-width: 28px;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
    }
    
    body {
        background: #1a202c;
        color: #e2e8f0;
    }
    
    .navbar {
        background: rgba(26, 32, 44, 0.95);
    }
    
    .features-section {
        background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
    }
    
    .feature-card {
        background: #2d3748;
        color: #e2e8f0;
    }
    
    .specs-section {
        background: #1a202c;
    }
}