/* ==========================================
   WEEX唯客交易所 - 核心样式表
   ========================================== */

/* CSS Variables */
:root {
    /* Primary Colors */
    --primary-color: #1e3a8a;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    
    /* Accent Colors */
    --accent-color: #f59e0b;
    --accent-dark: #d97706;
    --accent-light: #fbbf24;
    
    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-dark: #111827;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #3b82f6 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ==========================================
   Reset & Base Styles
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-base);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ==========================================
   Utility Classes
   ========================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fadeInRight {
    animation: fadeInRight 0.6s ease-out;
}

.animate-scaleIn {
    animation: scaleIn 0.5s ease-out;
}

/* ==========================================
   Header & Navigation
   ========================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

nav {
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

.logo span {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-menu li a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: color var(--transition-fast);
}

.nav-menu li a:hover {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ==========================================
   Buttons
   ========================================== */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    text-align: center;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.05rem;
}

/* ==========================================
   Hero Section
   ========================================== */
#hero {
    min-height: 100vh;
    background: var(--gradient-hero);
    padding: 120px var(--spacing-md) var(--spacing-xxl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xxl);
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.3;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    color: white;
    z-index: 1;
    animation: fadeInLeft 0.8s ease-out;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--accent-light);
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

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

.hero-buttons .btn-primary {
    background: var(--gradient-accent);
}

.hero-buttons .btn-secondary {
    border-color: white;
    color: white;
}

.hero-buttons .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-light);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-image {
    flex: 1;
    max-width: 550px;
    z-index: 1;
    animation: fadeInRight 0.8s ease-out;
}

.hero-image img {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: float 4s ease-in-out infinite;
}

/* ==========================================
   Features Section
   ========================================== */
#features {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

#features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.feature-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease-out backwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==========================================
   Services Section
   ========================================== */
#services {
    padding: var(--spacing-xxl) 0;
    background: white;
}

#services h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.services-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xxl);
}

.service-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    animation: fadeInUp 0.6s ease-out;
}

.service-item.reverse {
    direction: rtl;
}

.service-item.reverse .service-content {
    direction: ltr;
}

.service-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.service-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.service-item:hover .service-image img {
    transform: scale(1.05);
}

.service-content h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.service-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

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

.service-features li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--text-primary);
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* ==========================================
   Advantages Section
   ========================================== */
#advantages {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-secondary);
}

#advantages h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.advantages-text h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.advantage-point {
    margin-bottom: var(--spacing-lg);
}

.advantage-point h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
}

.advantage-point h4::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--gradient-accent);
    margin-right: var(--spacing-sm);
    border-radius: 2px;
}

.advantage-point p {
    color: var(--text-secondary);
    line-height: 1.7;
    padding-left: var(--spacing-md);
}

.advantages-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.advantages-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ==========================================
   FAQ Section
   ========================================== */
#faq {
    padding: var(--spacing-xxl) 0;
    background: white;
}

#faq h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-lg);
}

.faq-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    animation: fadeInUp 0.6s ease-out backwards;
}

.faq-item:nth-child(1) { animation-delay: 0.1s; }
.faq-item:nth-child(2) { animation-delay: 0.2s; }
.faq-item:nth-child(3) { animation-delay: 0.3s; }
.faq-item:nth-child(4) { animation-delay: 0.4s; }
.faq-item:nth-child(5) { animation-delay: 0.5s; }
.faq-item:nth-child(6) { animation-delay: 0.6s; }

.faq-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.faq-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-light);
}

.faq-answer p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-answer strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ==========================================
   CTA Section
   ========================================== */
#cta {
    padding: var(--spacing-xxl) 0;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

#cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(245, 158, 11, 0.3), transparent 50%);
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    animation: scaleIn 0.6s ease-out;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.95;
}

.cta-stats {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.cta-buttons .btn-primary {
    background: var(--gradient-accent);
}

.cta-buttons .btn-secondary {
    border-color: white;
    color: white;
}

.cta-buttons .btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.cta-features span {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    backdrop-filter: blur(10px);
}

/* ==========================================
   Footer
   ========================================== */
footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--accent-light);
}

.footer-section p {
    color: #9ca3af;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: #9ca3af;
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--accent-light);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: white;
    transition: all var(--transition-base);
}

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

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

.app-btn {
    padding: 0.75rem var(--spacing-md);
    background: var(--gradient-accent);
    color: white;
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    transition: all var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.footer-disclaimer {
    font-size: 0.85rem;
    color: #6b7280;
}

/* ==========================================
   Responsive Design
   ========================================== */

/* Tablet */
@media (max-width: 1024px) {
    #hero {
        padding: 100px var(--spacing-md) var(--spacing-xl);
        flex-direction: column;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        max-width: 100%;
        width: 100%;
    }

    .service-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .service-item.reverse {
        direction: ltr;
    }

    .advantages-content {
        grid-template-columns: 1fr;
    }

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

/* Mobile */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    #hero {
        min-height: auto;
        padding: 100px var(--spacing-md) var(--spacing-xl);
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

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

    #features h2,
    #services h2,
    #advantages h2,
    #faq h2,
    .cta-content h2 {
        font-size: 2rem;
    }

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

    .cta-buttons {
        flex-direction: column;
    }

    .cta-features {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }

    .app-buttons {
        flex-direction: row;
        justify-content: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

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

    .service-item h3 {
        font-size: 1.5rem;
    }

    .cta-content h2 {
        font-size: 1.75rem;
    }
}

/* Print Styles */
@media print {
    header,
    .hero-buttons,
    .cta-buttons,
    .mobile-menu-toggle {
        display: none;
    }

    body {
        font-size: 12pt;
        color: black;
    }

    #hero {
        background: white;
        color: black;
        min-height: auto;
        padding: 20pt;
    }

    section {
        page-break-inside: avoid;
    }
}