/* 基础变量 - 浅色模式（默认） */
:root {
    --primary: #f8f9fa;
    --secondary: #ffffff;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: rgba(37, 99, 235, 0.2);
    --gradient-gold: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #2563eb 100%);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --particle-color: 37, 99, 235;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --nav-border: rgba(0, 0, 0, 0.1);
}

/* 深色模式变量 */
body.dark-mode {
    --primary: #0a0a0a;
    --secondary: #1a1a1a;
    --accent: #c9a962;
    --accent-light: #e8d5a3;
    --text: #f5f5f5;
    --text-muted: #888;
    --border: rgba(201, 169, 98, 0.2);
    --gradient-gold: linear-gradient(135deg, #c9a962 0%, #e8d5a3 50%, #c9a962 100%);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    --card-bg: #1a1a1a;
    --particle-color: 201, 169, 98;
    --nav-bg: rgba(10, 10, 10, 0.95);
    --nav-border: rgba(255, 255, 255, 0.1);
}

/* 主题切换过渡动画 */
body {
    transition: background-color 0.5s ease, color 0.5s ease;
}

body * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--primary);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 粒子画布 */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* 导航 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 24px;
    color: var(--accent);
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    font-size: 20px;
    font-weight: 500;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

/* 主题切换按钮 */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--accent);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    z-index: 1001;
    pointer-events: auto;
}

.theme-toggle:hover {
    border-color: var(--accent);
    background: rgba(201, 169, 98, 0.1);
    transform: rotate(15deg);
}

body.light-mode .theme-toggle:hover {
    background: rgba(37, 99, 235, 0.1);
}

.theme-toggle svg {
    width: 22px;
    height: 22px;
    position: absolute;
    transition: all 0.3s ease;
}

.theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

.theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

body.light-mode .theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0) scale(1);
}

body.light-mode .theme-toggle .icon-moon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 1px;
    position: relative;
    transition: color 0.3s;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--gradient-gold);
    transition: width 0.3s;
}

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

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

/* Hero区域 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 40px 80px;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 12px;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    margin-bottom: 30px;
}

.title-line {
    display: block;
    font-size: clamp(32px, 6vw, 64px);
    font-weight: 300;
    letter-spacing: 8px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.title-sub {
    display: block;
    font-size: clamp(18px, 3vw, 28px);
    font-weight: 300;
    color: var(--text-muted);
    letter-spacing: 4px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 50px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    font-size: 14px;
    letter-spacing: 2px;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-gold);
    color: var(--primary);
    border: none;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.6s;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(201, 169, 98, 0.4);
}

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

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--accent);
    transition: width 0.4s;
    z-index: -1;
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--primary);
}

.btn-secondary:hover::before {
    width: 100%;
}

.btn-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.3s;
}

.btn:hover .btn-icon {
    transform: translateX(5px);
}

.btn-large {
    padding: 20px 40px;
    font-size: 16px;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 12px;
    letter-spacing: 2px;
    animation: bounce 2s infinite;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

/* 通用容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header.light {
    color: var(--text);
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 4px;
    color: var(--accent);
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 300;
    letter-spacing: 6px;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-muted);
    letter-spacing: 2px;
}

/* 关于我们 */
.about {
    padding: 120px 0;
    position: relative;
    z-index: 1;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.about-card {
    background: var(--secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 50px;
    transition: all 0.4s;
}

.about-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.card-icon {
    width: 60px;
    height: 60px;
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    color: var(--accent);
    transition: all 0.3s;
}

.card-icon svg {
    width: 28px;
    height: 28px;
}

.about-card:hover .card-icon {
    background: var(--accent);
    color: var(--primary);
    border-color: var(--accent);
}

.about-card h3 {
    font-size: 24px;
    font-weight: 400;
    letter-spacing: 2px;
    margin-bottom: 30px;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.info-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.info-label {
    color: var(--text-muted);
    font-size: 14px;
}

.info-value {
    color: var(--text);
    font-size: 14px;
    text-align: right;
    max-width: 60%;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
}

.feature-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
}

/* 服务范围 */
.services {
    padding: 120px 0;
    background: var(--secondary);
    position: relative;
    z-index: 1;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.service-item {
    display: flex;
    gap: 24px;
    padding: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.4s;
    background: var(--primary);
}

.service-item:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

.service-number {
    font-size: 48px;
    font-weight: 200;
    color: var(--accent);
    line-height: 1;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.service-item:hover .service-number {
    opacity: 1;
}

.service-content h3 {
    font-size: 20px;
    font-weight: 400;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.service-content p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.service-tags li {
    padding: 4px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-muted);
    transition: all 0.3s;
}

.service-item:hover .service-tags li {
    border-color: var(--accent);
    color: var(--accent);
}

/* 联系方式 */
.contact {
    padding: 120px 0;
    position: relative;
    z-index: 1;
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.3s;
}

.contact-item:hover {
    border-color: var(--accent);
    background: rgba(201, 169, 98, 0.05);
}

.contact-icon {
    width: 50px;
    height: 50px;
    border: 1px solid var(--border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-label {
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.contact-value {
    font-size: 16px;
    color: var(--text);
    line-height: 1.6;
}

.contact-cta {
    text-align: center;
    padding: 60px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--secondary);
}

.contact-cta h3 {
    font-size: 28px;
    font-weight: 300;
    letter-spacing: 4px;
    margin-bottom: 20px;
}

.contact-cta p {
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.8;
}

/* 页脚 */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    letter-spacing: 2px;
}

.footer-links {
    display: flex;
    gap: 40px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.footer-bottom p {
    margin-bottom: 10px;
}

.beian-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 14px;
}

.beian-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 14px;
    display: flex;
    align-items: center;
}

.beian-links a:hover {
    color: var(--accent);
}

.beian-divider {
    color: var(--text-muted);
    opacity: 0.5;
}

.gongan-beian {
    display: flex;
    align-items: center;
    gap: 8px;
}

.gongan-icon {
    width: 20px;
    height: 20px;
    vertical-align: middle;
}

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

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

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

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(10px);
    }
}

/* 响应式 */
@media (max-width: 1024px) {
    .about-grid,
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .about-card {
        padding: 30px;
    }
    
    .info-row {
        flex-direction: column;
        gap: 8px;
    }
    
    .info-value {
        text-align: left;
        max-width: 100%;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* 项目展示 */
.projects {
    padding: 120px 0;
    background: var(--secondary);
    position: relative;
    z-index: 1;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.project-item {
    padding: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--primary);
    transition: all 0.4s;
}

.project-item:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.project-icon {
    width: 48px;
    height: 48px;
    border: 1px solid var(--border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    flex-shrink: 0;
}

.project-icon svg {
    width: 24px;
    height: 24px;
}

.project-header h3 {
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 1px;
}

.project-item p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    padding: 4px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-muted);
}

.project-item:hover .project-tags span {
    border-color: var(--accent);
    color: var(--accent);
}