/* ===================================
   CSS Variables - 变量定义
   科技蓝主题 + 留白风格
   =================================== */

:root {
    /* 主色调 - 科技蓝 */
    --color-primary: #0066FF;
    --color-primary-dark: #0052CC;
    --color-primary-light: #3385FF;
    --color-accent: #00D4FF;

    /* 背景色 - 留白风格 */
    --color-bg-white: #FFFFFF;
    --color-bg-light: #F8FAFB;
    --color-bg-dark: #0A0E27;
    --color-bg-gradient: linear-gradient(135deg, #0A0E27 0%, #1E3A8A 100%);

    /* 文字颜色 */
    --color-text-primary: #1F2937;
    --color-text-secondary: #6B7280;
    --color-text-light: #F9FAFB;
    --color-text-white: #FFFFFF;

    /* 边框颜色 */
    --color-border: #E5E7EB;
    --color-border-light: #F3F4F6;

    /* 间距系统 (8px grid) */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;

    /* 字体大小 */
    --font-size-xs: 14px;
    --font-size-sm: 16px;
    --font-size-base: 18px;
    --font-size-lg: 24px;
    --font-size-xl: 32px;
    --font-size-2xl: 48px;
    --font-size-3xl: 64px;

    /* 字体粗细 */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* 行高 */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.8;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 102, 255, 0.2);

    /* 过渡动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 容器最大宽度 */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;

    /* Z-index层级 */
    --z-base: 1;
    --z-header: 100;
    --z-modal: 1000;
}

/* 深色背景区域的变量覆盖 */
.dark-section {
    --color-text-primary: var(--color-text-light);
    --color-text-secondary: rgba(255, 255, 255, 0.7);
}
/* ===================================
   CSS Reset - 样式重置
   Normalize + Custom Reset
   =================================== */

/* Box sizing rules */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Remove default margin */
body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd {
    margin: 0;
}

/* Remove list styles on ul, ol elements */
ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Set core root defaults */
html:focus-within {
    scroll-behavior: smooth;
}

/* Set core body defaults */
body {
    min-height: 100vh;
    text-rendering: optimizeSpeed;
    line-height: var(--line-height-normal);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", sans-serif;
    color: var(--color-text-primary);
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* A elements that don't have a class get default styles */
a {
    text-decoration: none;
    color: inherit;
}

a:not([class]) {
    text-decoration-skip-ink: auto;
}

/* Make images easier to work with */
img,
picture,
svg {
    max-width: 100%;
    display: block;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
    font: inherit;
}

/* Remove default button styles */
button {
    background: none;
    border: none;
    cursor: pointer;
}

/* Remove animations for people who've turned them off */
@media (prefers-reduced-motion: reduce) {
    html:focus-within {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}
/* ===================================
   Layout - 布局样式
   响应式布局 + 容器系统
   =================================== */

/* Container */
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

@media (min-width: 640px) {
    .container {
        max-width: var(--container-sm);
    }
}

@media (min-width: 768px) {
    .container {
        max-width: var(--container-md);
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: var(--container-lg);
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
}

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

/* Section */
.section {
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
}

@media (max-width: 768px) {
    .section {
        padding-top: var(--spacing-2xl);
        padding-bottom: var(--spacing-2xl);
    }
}

/* Header - 固定导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
}

/* Navigation */
.nav-list {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
}

.nav-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--spacing-xs) 0;
}

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

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

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

/* Hero Section - 留白风格 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--color-bg-gradient);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: var(--z-base);
}

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-white);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
}

.hero-subtitle {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.8);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-xl);
}

.hero-sphere {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .hero-sphere {
        height: 300px;
    }
}

/* Business Cards Grid - 留白设计 */
.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

@media (max-width: 1024px) {
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .business-grid {
        grid-template-columns: 1fr;
    }
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* Footer */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-text {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.6);
}

.footer-link {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-primary-light);
}
/* ===================================
   Components - 组件样式
   可复用的UI组件
   =================================== */

/* Button - 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    outline: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-outline:hover {
    background-color: var(--color-text-white);
    color: var(--color-primary);
}

/* Section Title - 区域标题 */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    line-height: var(--line-height-relaxed);
}

/* Business Card - 业务卡片（留白设计） */
.business-card {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.business-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

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

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 28px;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    color: var(--color-primary);
    background-color: rgba(0, 102, 255, 0.1);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-medium);
}

/* Contact Info - 联系信息卡片 */
.contact-card {
    background-color: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: var(--color-primary);
    color: var(--color-text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 20px;
}

.contact-info {
    flex: 1;
}

.contact-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-weight-medium);
}

.contact-value {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
}

.contact-value a {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.contact-value a:hover {
    color: var(--color-primary-dark);
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--color-text-secondary);
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
}

/* Scroll to Top Button */
.scroll-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: var(--color-text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 50;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}
/* ===================================
   Animations - 动画效果
   滚动动画 + 交互动画
   =================================== */

/* Fade In Animation */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Slide In from Left */
.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.animate-in {
    opacity: 1;
    transform: translateX(0);
}

/* Slide In from Right */
.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.animate-in {
    opacity: 1;
    transform: translateX(0);
}

/* Scale In */
.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.scale-in.animate-in {
    opacity: 1;
    transform: scale(1);
}

/* Stagger Animation for Cards */
.business-card {
    animation-fill-mode: both;
}

.business-card.animate-in:nth-child(1) {
    animation-delay: 0.1s;
}

.business-card.animate-in:nth-child(2) {
    animation-delay: 0.2s;
}

.business-card.animate-in:nth-child(3) {
    animation-delay: 0.3s;
}

.business-card.animate-in:nth-child(4) {
    animation-delay: 0.4s;
}

.business-card.animate-in:nth-child(5) {
    animation-delay: 0.5s;
}

.business-card.animate-in:nth-child(6) {
    animation-delay: 0.6s;
}

/* Pulse Animation for CTA Button */
@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(0, 102, 255, 0.7);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(0, 102, 255, 0);
    }
}

.btn-primary.pulse {
    animation: pulse 2s infinite;
}

/* Floating Animation for Sphere */
@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-sphere canvas {
    animation: float 6s ease-in-out infinite;
}

/* Gradient Animation for Hero Background */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

.hero {
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
}

/* Loading Animation */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.loading {
    animation: spin 1s linear infinite;
}

/* Shimmer Effect for Cards on Hover */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.business-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    background-size: 1000px 100%;
    animation: shimmer 3s infinite;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.business-card:hover::after {
    opacity: 1;
}

/* Text Gradient Animation */
@keyframes textGradient {
    0%, 100% {
        background-position: 0% center;
    }
    50% {
        background-position: 100% center;
    }
}

.text-gradient {
    background: linear-gradient(
        90deg,
        var(--color-primary),
        var(--color-accent),
        var(--color-primary)
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: textGradient 3s linear infinite;
}

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Hero Title Animation on Load */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    animation: slideDown 0.8s ease-out;
}

.hero-subtitle {
    animation: slideDown 0.8s ease-out 0.2s both;
}

.hero-cta {
    animation: slideDown 0.8s ease-out 0.4s both;
}

/* Particle Background Effect (optional) */
@keyframes particle {
    0% {
        opacity: 0;
        transform: translateY(0) scale(0);
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 0;
        transform: translateY(-100px) scale(1);
    }
}

/* Icon Bounce on Hover */
.card-icon {
    transition: transform var(--transition-normal);
}

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

/* Underline Animation for Links */
@keyframes underlineExpand {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

/* Responsive Animation Disable */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}