/* ========================================
   辛系未来官网 - 样式表
   设计风格: Minimalist Modern
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --background: #FAFAFA;
    --foreground: #0F172A;
    --muted: #F1F5F9;
    --muted-foreground: #64748B;
    --accent: #0052FF;
    --accent-secondary: #4D7CFF;
    --accent-foreground: #FFFFFF;
    --border: #E2E8F0;
    --card: #FFFFFF;
    
    /* Typography */
    --font-display: 'Noto Sans SC', 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Inter', 'Noto Sans SC', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --container-width: 1200px;
    --section-padding: 100px;
    
    /* Transitions */
    --transition-fast: 200ms ease-out;
    --transition-normal: 300ms ease-out;
    --transition-slow: 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

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

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition-normal);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--foreground);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: white;
    font-weight: 700;
    font-size: 18px;
    border-radius: 8px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    font-family: var(--font-display);
}

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

.nav-link {
    position: relative;
    text-decoration: none;
    color: var(--muted-foreground);
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
    transition: width var(--transition-normal);
}

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

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--foreground);
    transition: all var(--transition-normal);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--background);
    padding: 24px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

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

.mobile-link {
    display: block;
    padding: 12px 0;
    text-decoration: none;
    color: var(--foreground);
    font-size: 16px;
    font-weight: 500;
    border-bottom: 1px solid var(--border);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

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

.hero-gradient {
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(circle, rgba(0, 82, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-dots {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 80px 0;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--muted);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--muted-foreground);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.7; }
}

.hero-title {
    font-size: clamp(40px, 5vw, 64px);
    margin-bottom: 24px;
}

.title-line {
    display: block;
}

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

.hero-description {
    font-size: 18px;
    color: var(--muted-foreground);
    margin-bottom: 40px;
    line-height: 1.8;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: var(--accent-foreground);
    box-shadow: 0 4px 14px rgba(0, 82, 255, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 82, 255, 0.35);
}

.btn-secondary {
    background: var(--card);
    color: var(--foreground);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.visual-ring {
    position: absolute;
    inset: 0;
    border: 2px solid var(--border);
    border-radius: 50%;
    animation: rotate 60s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.visual-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 60px rgba(0, 82, 255, 0.3);
}

.core-inner {
    width: 60px;
    height: 60px;
    background: var(--card);
    border-radius: 50%;
}

.visual-orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px dashed var(--border);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 200px;
    height: 200px;
    margin: -100px 0 0 -100px;
}

.orbit-2 {
    width: 280px;
    height: 280px;
    margin: -140px 0 0 -140px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 360px;
    height: 360px;
    margin: -180px 0 0 -180px;
    animation-duration: 40s;
}

.orbit-dot {
    position: absolute;
    top: -6px;
    left: 50%;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* ========================================
   Section Common Styles
   ======================================== */
.section-header {
    margin-bottom: 60px;
}

.section-header.center {
    text-align: center;
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 18px;
    color: var(--muted-foreground);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: var(--section-padding) 0;
    background: var(--card);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-text {
    font-size: 16px;
    color: var(--muted-foreground);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

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

.stat-number {
    font-size: 48px;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--accent);
    line-height: 1;
}

.stat-suffix {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--muted-foreground);
    margin-top: 8px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-card {
    padding: 24px;
    background: var(--background);
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateX(8px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 10px;
    color: white;
    margin-bottom: 16px;
}

.feature-title {
    font-size: 18px;
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 14px;
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: var(--section-padding) 0;
    background: var(--background);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    position: relative;
    padding: 32px;
    background: var(--card);
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.service-card:hover {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(0, 82, 255, 0.1);
}

.service-card.featured {
    background: var(--foreground);
    color: white;
}

.service-card.featured .service-number,
.service-card.featured .service-desc,
.service-card.featured .service-list li {
    color: rgba(255, 255, 255, 0.7);
}

.service-card.featured .service-icon {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
}

.service-number {
    position: absolute;
    top: 24px;
    right: 24px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    color: var(--muted-foreground);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--muted);
    border-radius: 12px;
    color: var(--accent);
    margin-bottom: 24px;
}

.service-title {
    font-size: 24px;
    margin-bottom: 12px;
}

.service-desc {
    font-size: 15px;
    color: var(--muted-foreground);
    margin-bottom: 20px;
    line-height: 1.6;
}

.service-list {
    list-style: none;
}

.service-list li {
    position: relative;
    padding-left: 20px;
    font-size: 14px;
    color: var(--muted-foreground);
    margin-bottom: 8px;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

/* ========================================
   Cases Section
   ======================================== */
.cases {
    padding: var(--section-padding) 0;
    background: var(--card);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--background);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.case-card:hover {
    border-color: var(--accent);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 82, 255, 0.1);
}

.case-image {
    height: 200px;
    background: linear-gradient(135deg, var(--muted), var(--border));
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder {
    color: var(--muted-foreground);
}

.case-content {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--muted);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 12px;
}

.case-title {
    font-size: 18px;
    margin-bottom: 8px;
}

.case-desc {
    font-size: 14px;
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--section-padding) 0;
    background: var(--foreground);
    color: white;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info .section-label {
    color: var(--accent-secondary);
}

.contact-info .section-title {
    color: white;
}

.contact-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--accent-secondary);
}

.contact-label {
    display: block;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 15px;
    color: white;
}

/* Contact Form */
.contact-form-wrapper {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.form-group input,
.form-group textarea {
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: white;
    font-size: 15px;
    font-family: var(--font-body);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.08);
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 60px 0 30px;
    background: var(--background);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 14px;
    color: var(--muted-foreground);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-column a {
    display: block;
    font-size: 14px;
    color: var(--muted-foreground);
    text-decoration: none;
    margin-bottom: 12px;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--muted-foreground);
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    font-size: 13px;
    color: var(--muted-foreground);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        max-width: 100%;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .contact-form-wrapper {
        padding: 24px;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(28px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Animation Classes */
.animate-fade-in-up {
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-fade-in {
    animation: fadeIn 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Stagger Animation */
.stagger > * {
    opacity: 0;
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.1s; }
.stagger > *:nth-child(2) { animation-delay: 0.2s; }
.stagger > *:nth-child(3) { animation-delay: 0.3s; }
.stagger > *:nth-child(4) { animation-delay: 0.4s; }
.stagger > *:nth-child(5) { animation-delay: 0.5s; }