/* ========== 基础重置与变量 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 颜色系统 - 深色主题 */
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-border: rgba(255, 255, 255, 0.1);

    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-orb: radial-gradient(circle, rgba(102, 126, 234, 0.3) 0%, transparent 70%);

    /* 文字颜色 */
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.7);
    --color-text-muted: rgba(255, 255, 255, 0.5);

    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', var(--font-primary);

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);

    /* 边框半径 */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 999px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========== 全局样式 ========== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========== 玻璃态卡片 ========== */
.glass-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ========== 渐变文字 ========== */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.5));
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    cursor: pointer;
}

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

.contact-btn {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
}

.contact-btn:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* ========== Hero 首屏 ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--spacing-3xl);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 8s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--gradient-orb);
    top: -200px;
    left: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(245, 87, 108, 0.3) 0%, transparent 70%);
    top: 50%;
    right: -200px;
    animation-delay: -3s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(79, 172, 254, 0.3) 0%, transparent 70%);
    bottom: -150px;
    left: 50%;
    animation-delay: -6s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(50px, -50px) scale(1.1);
    }

    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: var(--spacing-xs) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
    font-weight: 500;
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.subtitle-highlight {
    color: var(--color-text-primary);
    font-weight: 600;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.05rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ========== Section 通用样式 ========== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

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

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: stretch;
    /* 让左右两边高度一致 */
}

.about-text {
    font-size: 1.05rem;
    line-height: 1.8;
    display: flex;
    flex-direction: column;
    justify-content: center;
    /* 内容垂直居中 */
}

.mb-4 {
    margin-bottom: var(--spacing-md);
}

.mb-6 {
    margin-bottom: var(--spacing-lg);
}

.about-values {
    display: grid;
    gap: var(--spacing-md);
}

.value-card {
    padding: var(--spacing-lg);
}

.value-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.3));
}

.value-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.value-desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== Services 核心服务 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.4));
}

.service-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
}

.service-subtitle {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.service-desc {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== Technology 技术栈 ========== */
.technology {
    background: var(--color-bg-secondary);
}

.tech-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.tech-diagram h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.tech-layers {
    display: grid;
    gap: var(--spacing-sm);
}

.tech-layer {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    border-left: 3px solid transparent;
    background-image: var(--gradient-primary);
    background-clip: border-box;
    background-origin: border-box;
    transition: all var(--transition-base);
}

.tech-layer:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateX(4px);
}

.layer-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.layer-value {
    font-weight: 600;
}

.tech-stack-grid {
    display: grid;
    gap: var(--spacing-md);
}

.tech-card {
    padding: var(--spacing-md);
}

.tech-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.tech-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
}

.tech-status {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.tech-status.active {
    background: rgba(34, 197, 94, 0.2);
    color: #4ade80;
}

.tech-status.planned {
    background: rgba(234, 179, 8, 0.2);
    color: #facc15;
}

.tech-role {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ========== Contact 联系我们 ========== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.contact-info h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
}

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

.contact-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.3));
}

.contact-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.contact-value {
    font-weight: 600;
    font-size: 1.05rem;
}

.contact-cta {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.cta-text {
    line-height: 1.6;
}

/* ========== 表单样式 ========== */
.contact-form {
    padding: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
}

/* ========== Footer 页脚 ========== */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

.footer-tagline {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-col h4 {
    font-family: var(--font-display);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-col a {
    display: block;
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--color-text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-tech {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {

    .about-content,
    .tech-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-md);
    }

    .nav-link {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }
}

/* ========== 语言切换器 ========== */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-right: var(--spacing-md);
    font-size: 0.9rem;
    font-weight: 600;
}

.lang-link {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.lang-link:hover,
.lang-link.active {
    color: var(--color-text-primary);
}

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

@media (max-width: 768px) {
    .lang-switch {
        margin-right: 0;
        margin-bottom: var(--spacing-md);
    }
}

/* ========== Value Proposition (痛点与方案) ========== */
.value-prop {
    background: linear-gradient(to bottom, var(--color-bg), var(--color-bg-secondary));
}

.prop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.prop-card {
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.prop-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.5;
}

.prop-icon-wrapper {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.prop-pain h4,
.prop-solution h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.prop-pain {
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    opacity: 0.8;
}

.prop-pain h4 {
    color: #ff6b6b;
    /* 红色警示色 */
}

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

.prop-solution {
    padding-top: var(--spacing-sm);
}

.prop-solution h4 {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

.prop-solution p {
    font-size: 1rem;
    color: var(--color-text-primary);
    line-height: 1.6;
}