/* =========================================================================
   全局变量与重置
   ========================================================================= */
   :root {
    --bg-dark: #0a0f1a;
    --bg-darker: #05080f;
    --bg-card: rgba(20, 28, 45, 0.6);
    --border-color: rgba(60, 110, 255, 0.2);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --primary-color: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.5);
    --accent-color: #06b6d4;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 5%;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dot {
    color: var(--accent-color);
}

/* =========================================================================
   导航栏 (Navbar)
   ========================================================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 24px 0;
    z-index: 1000;
    transition: var(--transition);
    background: rgba(10, 15, 26, 0);
}

.navbar.scrolled {
    padding: 16px 0;
    background: rgba(10, 15, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    margin-left: 6px;
    box-shadow: 0 0 10px var(--accent-color);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
}

.mobile-menu-btn .bar {
    position: absolute;
    width: 100%;
    height: 2px;
    background: white;
    transition: var(--transition);
}

.mobile-menu-btn .bar:nth-child(1) { top: 0; }
.mobile-menu-btn .bar:nth-child(2) { top: 9px; }
.mobile-menu-btn .bar:nth-child(3) { top: 18px; }

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    z-index: 999;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    opacity: 0;
    transform: translateY(-20px);
    transition: var(--transition);
}

.mobile-menu.active {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================================
   按钮样式
   ========================================================================= */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), #6366f1);
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.7);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.4);
}

/* =========================================================================
   首屏区 (Hero)
   ========================================================================= */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.mesh-gradient {
    position: absolute;
    top: -50%;
    left: -20%;
    width: 100vw;
    height: 150vh;
    background: radial-gradient(circle at 10% 20%, rgba(13, 22, 45, 1) 0%, rgba(6, 11, 23, 0) 40%),
                radial-gradient(circle at 80% 80%, rgba(20, 36, 75, 0.8) 0%, rgba(6, 11, 23, 0) 50%);
    filter: blur(60px);
    z-index: 1;
    animation: drift 15s infinite alternate ease-in-out;
}

@keyframes drift {
    0% { transform: scale(1) translate(0px, 0px); }
    100% { transform: scale(1.1) translate(30px, -30px); }
}

.stars {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255,255,255,0.15) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 2;
    mask-image: linear-gradient(to bottom, black, transparent);
    -webkit-mask-image: linear-gradient(to bottom, black, transparent);
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 20px;
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

.mouse {
    width: 30px;
    height: 48px;
    border: 2px solid var(--text-secondary);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: wheel 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-15px) translateX(-50%); }
    60% { transform: translateY(-7px) translateX(-50%); }
}

@keyframes wheel {
    0% { top: 8px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

/* =========================================================================
   常规区块样式 (Sections)
   ========================================================================= */
section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    position: relative;
    display: inline-block;
}

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

/* =========================================================================
   关于我们区 (About)
   ========================================================================= */
.about-section {
    background-color: var(--bg-darker);
    position: relative;
}

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

.about-image-wrapper {
    position: relative;
    border-radius: 24px;
    overflow: visible;
}

.about-img {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
    object-fit: cover;
    aspect-ratio: 4/3;
}

.glass-float-card {
    position: absolute;
    background: rgba(20, 28, 45, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    animation: float 6s ease-in-out infinite;
}

.glass-float-card.primary {
    bottom: -20px;
    right: -20px;
    animation-delay: 1s;
}

.glass-float-card.secondary {
    top: 40px;
    left: -30px;
    animation-direction: reverse;
}

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

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 8px;
}

.glass-float-card.secondary .stat-num {
    color: var(--accent-color);
}

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.about-company {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--accent-color);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.about-text strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* =========================================================================
   服务介绍区 (Services)
   ========================================================================= */
.services-section {
    position: relative;
    background: var(--bg-dark);
}

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

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px 32px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    cursor: default;
    z-index: 1;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(800px circle at var(--mouse-x, 0) var(--mouse-y, 0), rgba(59, 130, 246, 0.08), transparent 40%);
    z-index: -1;
    transition: opacity 0.5s;
    opacity: 0;
}

.service-card:hover::before {
    opacity: 1;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: rgba(60, 110, 255, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.service-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    margin-bottom: 24px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: var(--primary-color);
    color: white;
}

.service-card svg {
    width: 32px;
    height: 32px;
}

.service-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =========================================================================
   页脚区 (Footer)
   ========================================================================= */
.footer {
    background-color: var(--bg-darker);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 60px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-info {
    max-width: 400px;
}

.footer-info h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

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

.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--text-secondary);
}

.contact-icon {
    font-size: 1.2rem;
    margin-top: -2px;
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* =========================================================================
   组件与工具类
   ========================================================================= */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: white;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 99;
    backdrop-filter: blur(8px);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

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

/* Scroll Animation Classes */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.reveal[data-direction="left"] { transform: translateX(-40px); }
.reveal[data-direction="right"] { transform: translateX(40px); }
.reveal[data-direction="up"] { transform: translateY(40px); }

.reveal.active {
    opacity: 1;
    transform: translate(0, 0);
}

/* =========================================================================
   响应式设计 (Media Queries)
   ========================================================================= */
@media (max-width: 992px) {
    .hero-title { font-size: 3.5rem; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .about-image-wrapper { max-width: 80%; margin: 0 auto; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    
    .hero-title { font-size: 2.8rem; }
    .hero-subtitle { font-size: 1.1rem; }
    
    .services-grid { grid-template-columns: 1fr; }
    
    .footer-content { flex-direction: column; }
    
    .glass-float-card.primary { right: 0; }
    .glass-float-card.secondary { left: 0; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2.2rem; }
    .hero-actions { flex-direction: column; width: 100%; gap: 12px; }
    .btn { text-align: center; }
    .section-title { font-size: 2rem; }
}