/* ========================================
   梦想传媒网站样式表
   v2.0 - 优化版本
   ======================================== */

/* CSS变量 */
:root {
    /* 主色调 */
    --primary-dark: #1a1a2e;
    --primary-darker: #0f0f1a;
    --accent-gold: #f7931e;
    --accent-gold-light: #ff6b35;
    --accent-secondary: #ff4757;
    
    /* 文字颜色 */
    --text-white: #ffffff;
    --text-light: #e0e0e0;
    --text-muted: #a0a0a0;
    --text-dark: #1a1a2e;
    
    /* 背景色 */
    --bg-dark: #0f0f1a;
    --bg-darker: #070710;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --bg-gradient: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
    
    /* 渐变 */
    --gradient-gold: linear-gradient(135deg, #f7931e 0%, #ff6b35 100%);
    --gradient-dark: linear-gradient(180deg, rgba(15, 15, 26, 0) 0%, rgba(15, 15, 26, 1) 100%);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-gold: 0 5px 30px rgba(247, 147, 30, 0.3);
    --shadow-glow: 0 0 20px rgba(247, 147, 30, 0.5);
    
    /* 过渡 */
    --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);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --radius-full: 9999px;
    
    /* 间距 */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    
    /* 字体大小 */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    --font-4xl: 2.25rem;
    --font-5xl: 3rem;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}

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

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-gold);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-gold-light);
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    padding: 15px 0;
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-white);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo-img {
    height: 90px;
    width: auto;
    max-width: 300px;
    object-fit: contain;
    transition: var(--transition-normal);
}

.navbar.scrolled .logo-img {
    height: 70px;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--gradient-gold);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.logo-text {
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    transition: var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-gold);
    transition: var(--transition-normal);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--text-white);
    transition: var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 28px;
    border-radius: var(--radius-xl);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient-gold);
    color: var(--text-white);
    box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(247, 147, 30, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-gold);
    color: var(--accent-gold);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* ========================================
   英雄区域
   ======================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(247, 147, 30, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
        var(--bg-darker);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-dark);
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 20px;
}

.hero-title {
    margin-bottom: 20px;
}

.title-main {
    display: block;
    font-size: 4rem;
    font-weight: 900;
    letter-spacing: 8px;
    background: linear-gradient(135deg, #fff 0%, #f7931e 50%, #fff 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.title-sub {
    display: block;
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 15px;
    color: var(--accent-gold);
    margin-top: 10px;
}

.hero-slogan {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 20px;
    letter-spacing: 3px;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

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

.scroll-indicator i {
    font-size: 1.2rem;
    color: var(--accent-gold);
}

/* ========================================
   通用区块样式
   ======================================== */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    color: var(--accent-gold);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   关于我们
   ======================================== */
.about {
    background: var(--bg-darker);
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-intro {
    text-align: center;
    margin-bottom: 60px;
}

.about-intro h3 {
    font-size: 1.8rem;
    color: var(--text-white);
    margin-bottom: 20px;
}

.about-intro p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 1.05rem;
}

/* 核心数据 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 80px;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.stat-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-gold);
    transform: translateY(-5px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--accent-gold);
    line-height: 1;
    margin-bottom: 10px;
}

.stat-number::after {
    content: '+';
    font-size: 2rem;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-muted);
}

/* 发展历程 */
.timeline {
    margin-bottom: 80px;
}

.timeline-title {
    font-size: 1.5rem;
    color: var(--text-white);
    text-align: center;
    margin-bottom: 40px;
}

.timeline-items {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    min-width: 250px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.timeline-item:hover {
    border-color: var(--accent-gold);
    transform: translateX(10px);
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--gradient-gold);
    border-radius: 50%;
    margin-top: 5px;
    flex-shrink: 0;
}

.timeline-year {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-gold);
    margin-bottom: 5px;
}

.timeline-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 合作客户 */
.clients-title {
    font-size: 1.5rem;
    color: var(--text-white);
    text-align: center;
    margin-bottom: 40px;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.client-category {
    padding: 25px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.client-category h4 {
    font-size: 1rem;
    color: var(--accent-gold);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.client-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.client-tags span {
    padding: 6px 14px;
    background: rgba(247, 147, 30, 0.1);
    color: var(--text-light);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: var(--transition-fast);
}

.client-tags span:hover {
    background: var(--accent-gold);
    color: var(--text-white);
}

/* ========================================
   服务项目
   ======================================== */
.services {
    background: var(--bg-dark);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-card {
    padding: 40px 30px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.service-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-10px);
    border-color: rgba(247, 147, 30, 0.3);
}

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

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-gold);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--text-white);
    margin-bottom: 25px;
}

.service-title {
    font-size: 1.3rem;
    color: var(--text-white);
    margin-bottom: 15px;
}

.service-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.service-features {
    list-style: none;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.service-features li i {
    color: var(--accent-gold);
    font-size: 0.8rem;
}

/* ========================================
   作品展示
   ======================================== */
.portfolio {
    background: var(--bg-darker);
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 25px;
    background: transparent;
    color: var(--text-light);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-normal);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-gold);
    border-color: transparent;
    color: var(--text-white);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.portfolio-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
}

.portfolio-item.hidden {
    display: none;
}

.portfolio-thumb {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.thumb-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--bg-darker) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.thumb-placeholder i {
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.1);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.9) 100%);
    display: flex;
    align-items: flex-end;
    padding: 25px;
    opacity: 0;
    transition: var(--transition-normal);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.overlay-content {
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.portfolio-item:hover .overlay-content {
    transform: translateY(0);
}

.overlay-content h4 {
    font-size: 1rem;
    color: var(--text-white);
    margin-bottom: 5px;
    line-height: 1.4;
}

.overlay-content p {
    font-size: 0.85rem;
    color: var(--accent-gold);
    margin-bottom: 15px;
}

.view-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: var(--gradient-gold);
    border-radius: 50%;
    color: var(--text-white);
    transition: var(--transition-normal);
}

.view-btn:hover {
    transform: scale(1.1);
}

/* ========================================
   精英团队
   ======================================== */
.team {
    background: var(--bg-dark);
}

.team-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
    color: var(--text-light);
    font-size: 1.05rem;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.team-card {
    text-align: center;
    padding: 40px 25px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.team-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-10px);
    border-color: var(--accent-gold);
}

.team-avatar {
    width: 100px;
    height: 100px;
    background: var(--gradient-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2.5rem;
    color: var(--text-white);
}

.team-name {
    font-size: 1.2rem;
    color: var(--text-white);
    margin-bottom: 8px;
}

.team-role {
    color: var(--accent-gold);
    font-size: 0.95rem;
}

/* ========================================
   新闻资讯
   ======================================== */
.news {
    background: var(--bg-darker);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-gold);
}

.news-thumb {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.news-thumb .thumb-placeholder {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--bg-darker) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-thumb .thumb-placeholder i {
    font-size: 2.5rem;
    color: rgba(255, 255, 255, 0.1);
}

.news-content {
    padding: 25px;
}

.news-date {
    display: inline-block;
    padding: 5px 12px;
    background: rgba(247, 147, 30, 0.1);
    color: var(--accent-gold);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.news-title {
    font-size: 1.1rem;
    color: var(--text-white);
    margin-bottom: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    color: var(--accent-gold);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.news-link:hover {
    gap: 12px;
}

/* ========================================
   联系我们
   ======================================== */
.contact {
    background: var(--bg-dark);
}

.contact-content {
    display: flex;
    justify-content: center;
}

.contact-info h3 {
    font-size: 1.5rem;
    color: var(--text-white);
    margin-bottom: 30px;
    text-align: center;
}

.contact-info {
    max-width: 500px;
    text-align: center;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 25px;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: rgba(247, 147, 30, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent-gold);
    flex-shrink: 0;
}

.info-content h4 {
    font-size: 1rem;
    color: var(--text-white);
    margin-bottom: 5px;
}

.info-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    justify-content: center;
}

.social-link {
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.social-link:hover {
    background: var(--gradient-gold);
    color: var(--text-white);
    transform: translateY(-5px);
}

/* 联系表单 */
.contact-form-wrapper {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.contact-form h3 {
    font-size: 1.5rem;
    color: var(--text-white);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-white);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition-normal);
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-gold);
    background: rgba(247, 147, 30, 0.05);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    display: block;
    color: #ff6b6b;
    font-size: 0.85rem;
    margin-top: 5px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-darker);
    padding: 80px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-white);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-logo .logo-img {
    height: 80px;
    width: auto;
    max-width: 250px;
    object-fit: contain;
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.footer-slogan {
    color: var(--accent-gold);
    font-size: 1rem;
    margin-bottom: 15px;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-links h4,
.footer-services h4,
.footer-contact h4 {
    color: var(--text-white);
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.footer-links ul,
.footer-services ul,
.footer-contact ul {
    list-style: none;
}

.footer-links li,
.footer-services li {
    margin-bottom: 12px;
}

.footer-links a,
.footer-services a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

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

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.footer-contact li i {
    color: var(--accent-gold);
    width: 16px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

/* ========================================
   返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-gold);
    border: none;
    border-radius: 50%;
    color: var(--text-white);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-gold);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
}

/* ========================================
   响应式设计
   ======================================== */

/* 平板设备 */
@media (max-width: 1024px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(15, 15, 26, 0.98);
        flex-direction: column;
        justify-content: center;
        padding: 40px;
        transition: var(--transition-normal);
        backdrop-filter: blur(20px);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        font-size: 1.2rem;
        padding: 15px 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-actions .btn {
        display: none;
    }
    
    .title-main {
        font-size: 3rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-content {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机设备 */
@media (max-width: 640px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .title-main {
        font-size: 2.2rem;
        letter-spacing: 4px;
    }
    
    .title-sub {
        font-size: 1rem;
        letter-spacing: 8px;
    }
    
    .hero-slogan {
        font-size: 1.2rem;
    }
    
    .hero-desc {
        font-size: 0.95rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .timeline-items {
        flex-direction: column;
    }
    
    .clients-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-filter {
        gap: 10px;
    }
    
    .filter-btn {
        padding: 8px 18px;
        font-size: 0.85rem;
    }
    
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        padding: 25px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* 小屏手机 */
@media (max-width: 380px) {
    .title-main {
        font-size: 1.8rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}