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

:root {
    --primary: #000000;
    --secondary: #1a1a1a;
    --accent: #FF6B35;
    --accent-light: #FF8C5A;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-muted: #666666;
    --bg-light: #F5F5F5;
    --bg-dark: #0A0A0A;
    --container: 1400px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-xxl: 10rem;
    --radius: 0;
    --shadow: 0 20px 40px rgba(0,0,0,0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 16px;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: var(--transition);
}

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

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(255, 107, 53, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 6rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-slogan {
    display: inline-flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 107, 53, 0.1);
    border: 1px solid rgba(255, 107, 53, 0.2);
    border-radius: 100px;
}

.hero-slogan span:first-child {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-slogan span:last-child {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

section {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

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

.section-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.what-we-dont-do {
    background: var(--primary);
}

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

.dont-do-item {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(255,255,255,0.02) 0%, rgba(255,255,255,0.01) 100%);
    border: 1px solid rgba(255,255,255,0.05);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.dont-do-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-light) 100%);
}

.dont-do-item:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 107, 53, 0.3);
    box-shadow: var(--shadow);
}

.dont-do-item .icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

.dont-do-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.dont-do-item p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.what-we-do {
    background: var(--bg-light);
    color: var(--primary);
}

.what-we-do .section-title {
    color: var(--primary);
}

.what-we-do .section-description {
    color: var(--text-muted);
}

.do-content {
    text-align: center;
}

.core-mission {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.mission-item {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.mission-item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    opacity: 0;
    transition: var(--transition);
}

.mission-item:hover {
    transform: scale(1.05);
}

.mission-item:hover::after {
    opacity: 1;
}

.mission-item span {
    position: relative;
    z-index: 1;
}

.mission-divider {
    font-size: 2rem;
    color: var(--accent);
    font-weight: 300;
}

.brand-philosophy {
    background: var(--primary);
}

.philosophy-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.philosophy-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    line-height: 1.3;
}

.philosophy-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.philosophy-content strong {
    color: var(--accent);
    font-weight: 600;
}

.why-choose {
    background: linear-gradient(180deg, var(--bg-light) 0%, var(--bg-dark) 100%);
    color: var(--primary);
}

.why-choose .section-title {
    color: var(--primary);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-xl);
    background: var(--text-primary);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(0,0,0,0.05);
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 0;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    transition: var(--transition);
}

.feature-item:hover::before {
    height: 5px;
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.05em;
}

.feature-item h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary);
}

.feature-item p {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

.about {
    background: var(--primary);
}

.about-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-content strong {
    color: var(--accent);
    font-weight: 600;
}

.footer {
    background: var(--bg-dark);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    text-align: center;
}

.footer-brand h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

.footer-copyright {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255,255,255,0.05);
    width: 100%;
    max-width: 600px;
}

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

.footer-copyright a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
    opacity: 0.7;
}

.scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

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

@media (max-width: 768px) {
    .navbar-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .dont-do-list {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: var(--spacing-xl) 0 var(--spacing-lg);
    }
    
    section {
        padding: var(--spacing-xl) 0;
    }
    
    .feature-item {
        padding: var(--spacing-lg);
    }
    
    .core-mission {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: #FFFFFF;
    border-radius: 8px;
    width: 90%;
    max-width: 420px;
    transform: scale(0.95) translateY(10px);
    transition: all 0.3s ease;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 24px 16px;
    border-bottom: 1px solid #E5E7EB;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #111827;
}

.modal-close {
    background: none;
    border: none;
    color: #9CA3AF;
    font-size: 1.75rem;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.modal-close:hover {
    color: #374151;
    background: #F3F4F6;
}

.modal-body {
    padding: 24px;
}

.contact-info {
    text-align: left;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: #F9FAFB;
    border-radius: 8px;
}

.contact-icon {
    font-size: 2rem;
}

.contact-label {
    color: #6B7280;
    font-size: 0.875rem;
    margin-bottom: 4px;
}

.contact-value {
    color: #111827;
    font-size: 1.125rem;
    font-weight: 500;
}