/* ===================================
   新盛公司在线客服 - 深色模式(OLED) · 霓虹/赛博朋克风格
   =================================== */

/* CSS Variables - Design System */
:root {
    /* Background Colors */
    --bg-black: #000000;
    --bg-dark-grey: #121212;
    --bg-midnight: #0A0E27;
    
    /* Text Colors */
    --text-primary: #FFFFFF;
    --text-secondary: #B8BCC8;
    
    /* Accent Colors - Neon */
    --accent-neon: #39FF14;
    --accent-blue: #0080FF;
    --accent-gold: #FFD700;
    --accent-purple: #BF00FF;
    --accent-purple-text: #D966FF;
    
    /* Border & Divider */
    --border-color: #26262E;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    /* Shadows - Neon Glow */
    --shadow-neon-green: 0 0 20px rgba(57, 255, 20, 0.3);
    --shadow-neon-blue: 0 0 20px rgba(0, 128, 255, 0.3);
    --shadow-neon-gold: 0 0 20px rgba(255, 215, 0, 0.3);
    --shadow-neon-purple: 0 0 20px rgba(191, 0, 255, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-black);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2rem, 5vw, 4rem); font-weight: 900; }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    max-width: 34em;
}

a {
    color: var(--accent-neon);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-blue);
}

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

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

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

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.brand-icon {
    filter: drop-shadow(0 0 8px var(--accent-neon));
}

.brand-text {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: color var(--transition-fast);
}

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

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

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

.cta-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-neon);
    color: var(--bg-black);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-neon-green);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(57, 255, 20, 0.5);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(80px + var(--spacing-3xl)) var(--spacing-lg) var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-text {
    position: relative;
    z-index: 2;
}

.eyebrow {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-neon);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 0 10px var(--accent-neon);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-neon) 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(57, 255, 20, 0.3);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-neon);
    color: var(--bg-black);
    box-shadow: var(--shadow-neon-green);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(57, 255, 20, 0.5);
    color: var(--bg-black);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-neon);
    color: var(--accent-neon);
    box-shadow: var(--shadow-neon-green);
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

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

.stat-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--accent-neon);
    text-shadow: 0 0 15px var(--accent-neon);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.neon-circle {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(57, 255, 20, 0.1) 0%, transparent 70%);
    border: 2px solid var(--accent-neon);
    box-shadow: 
        0 0 60px rgba(57, 255, 20, 0.3),
        inset 0 0 60px rgba(57, 255, 20, 0.1);
    animation: pulse 3s ease-in-out infinite;
}

.neon-grid {
    position: absolute;
    width: 300px;
    height: 300px;
    background-image: 
        linear-gradient(var(--accent-blue) 1px, transparent 1px),
        linear-gradient(90deg, var(--accent-blue) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.3;
    transform: perspective(500px) rotateX(60deg);
    animation: gridMove 10s linear infinite;
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(18, 18, 18, 0.9);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    animation: float 4s ease-in-out infinite;
}

.floating-card svg {
    filter: drop-shadow(0 0 8px currentColor);
}

.floating-card span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 5%;
    animation-delay: 1s;
}

.card-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 2s;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes gridMove {
    0% { background-position: 0 0; }
    100% { background-position: 30px 30px; }
}

/* ===================================
   Chips Section
   =================================== */
.chips-section {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: var(--bg-dark-grey);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.chips-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.chip {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(57, 255, 20, 0.1);
    border: 1px solid var(--accent-neon);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent-neon);
    text-shadow: 0 0 8px var(--accent-neon);
}

/* ===================================
   Section Common Styles
   =================================== */
section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 0 10px var(--accent-blue);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ===================================
   About Section
   =================================== */
.about-section {
    background: var(--bg-dark-grey);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-lead {
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.feature-item svg {
    flex-shrink: 0;
    filter: drop-shadow(0 0 6px var(--accent-neon));
}

.about-image {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 4/3;
}

.image-container {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-midnight);
}

.image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(57, 255, 20, 0.1) 0%, rgba(0, 128, 255, 0.1) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

/* ===================================
   Services Section
   =================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    padding: var(--spacing-xl);
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-neon), var(--accent-blue), var(--accent-purple));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-neon);
    box-shadow: var(--shadow-neon-green);
}

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

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(57, 255, 20, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.service-icon svg {
    filter: drop-shadow(0 0 8px currentColor);
}

.service-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.service-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.service-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-neon);
}

/* ===================================
   Team Section
   =================================== */
.team-section {
    background: var(--bg-dark-grey);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
}

.team-card {
    background: var(--bg-black);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.team-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-neon-blue);
}

.team-avatar {
    width: 100%;
    aspect-ratio: 1;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-midnight);
}

.team-info {
    padding: var(--spacing-lg);
}

.team-name {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.team-role {
    font-size: 0.875rem;
    color: var(--accent-neon);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 0 8px var(--accent-neon);
}

.team-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.team-contact {
    display: flex;
    gap: var(--spacing-sm);
}

.contact-link {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(57, 255, 20, 0.1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--accent-neon);
    transition: all var(--transition-fast);
}

.contact-link:hover {
    background: var(--accent-neon);
    color: var(--bg-black);
    box-shadow: var(--shadow-neon-green);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.contact-card:hover {
    border-color: var(--accent-neon);
    box-shadow: var(--shadow-neon-green);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(57, 255, 20, 0.1);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-icon svg {
    filter: drop-shadow(0 0 8px currentColor);
}

.contact-details h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-neon);
    text-shadow: 0 0 10px var(--accent-neon);
    margin-bottom: var(--spacing-xs);
}

.contact-note {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
}

.contact-form-container {
    background: var(--bg-dark-grey);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
}

.contact-form h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-black);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-neon);
    box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2);
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-dark-grey);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-logo {
    filter: drop-shadow(0 0 8px var(--accent-neon));
}

.footer-brand-text {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 300px;
}

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

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-column a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.footer-bottom a {
    color: var(--text-secondary);
}

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-black);
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-md);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .cta-button {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-section {
        padding-top: calc(80px + var(--spacing-xl));
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .chips-container {
        gap: var(--spacing-sm);
    }
    
    .chip {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* ===================================
   Accessibility
   =================================== */
:focus-visible {
    outline: 2px solid var(--accent-neon);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* ===================================
   Random Image Styles
   =================================== */
.random-image {
    position: relative;
}

.random-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(57, 255, 20, 0.05) 0%, rgba(0, 128, 255, 0.05) 100%);
    pointer-events: none;
}