/**
 * 沭阳小南网络科技有限公司官网 - 主样式表
 * 基于专业Design System设计规范
 */

:root {
    /* ========== Color System ========== */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #3b82f6;
    --color-neutral-50: #f9fafb;
    --color-neutral-100: #f3f4f6;
    --color-neutral-200: #e5e7eb;
    --color-neutral-300: #d1d5db;
    --color-neutral-400: #9ca3af;
    --color-neutral-500: #6b7280;
    --color-neutral-600: #4b5563;
    --color-neutral-700: #374151;
    --color-neutral-800: #1f2937;
    --color-neutral-900: #111827;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* ========== Typography Scale ========== */
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 20px;
    --text-xl: 24px;
    --text-2xl: 32px;
    
    /* ========== Spacing System (4px grid) ========== */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    
    /* ========== Shadows ========== */
    --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-2: 0 4px 12px rgba(0, 0, 0, 0.1);
    
    /* ========== Border Radius ========== */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: var(--text-base);
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-neutral-900);
    background-color: #ffffff;
    padding-top: 76px;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    background-color: var(--color-neutral-900) !important;
    padding: var(--space-4) 0;
    transition: all 0.3s;
    box-shadow: var(--shadow-1);
    z-index: 1030;
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
}

.navbar-brand {
    font-size: var(--text-xl);
    font-weight: 600;
    color: #ffffff !important;
    text-decoration: none !important;
}

.navbar-brand:hover {
    color: var(--color-primary) !important;
}

.navbar-brand i {
    color: var(--color-primary) !important;
}

.navbar-nav .nav-link {
    color: #ffffff !important;
    font-weight: 500;
    padding: var(--space-2) var(--space-4) !important;
    transition: all 0.3s;
    position: relative;
    text-decoration: none !important;
}

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

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: all 0.3s;
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 80%;
}

.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5) !important;
    padding: var(--space-2) var(--space-3);
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 var(--space-1) rgba(37, 99, 235, 0.5) !important;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

.navbar-collapse {
    align-items: center;
}

@media (min-width: 992px) {
    .navbar-collapse {
        display: flex !important;
        flex-basis: auto;
    }
}

.navbar-nav {
    align-items: center;
}

@media (min-width: 992px) {
    .navbar-nav {
        display: flex;
        flex-direction: row;
        margin-left: auto;
    }
}

.language-switcher {
    min-width: 120px;
}

/* ========================================
   Hero Slider
   ======================================== */
.hero-slider {
    position: relative;
    height: 100vh;
    min-height: 700px;
    overflow: hidden;
    background-color: var(--color-neutral-900);
}

.slider-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
    z-index: 1;
}

.slide.active {
    opacity: 1;
    z-index: 2;
}

.slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-neutral-900);
}

.slide-content {
    position: relative;
    z-index: 10;
    height: 100%;
    display: flex;
    align-items: center;
    color: #ffffff;
}

.slide-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--color-primary);
    margin-bottom: var(--space-6);
}

.slide-badge i {
    color: var(--color-warning);
}

.slide-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--space-6);
    color: #ffffff;
}

.gradient-text {
    color: var(--color-primary);
}

.slide-subtitle {
    font-size: var(--text-lg);
    margin-bottom: var(--space-8);
    opacity: 0.9;
    max-width: 600px;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.9);
}

.slide-buttons {
    margin-bottom: var(--space-12);
    display: flex;
    gap: var(--space-4);
}

.btn-primary-custom {
    background-color: var(--color-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    font-size: var(--text-base);
    transition: background-color 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.btn-primary-custom:hover {
    background-color: var(--color-primary-hover);
    color: #ffffff;
}

.btn-outline-custom {
    background-color: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    font-size: var(--text-base);
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.btn-outline-custom:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
    color: #ffffff;
}

.slide-stats {
    display: flex;
    gap: var(--space-8);
    margin-top: var(--space-8);
}

.slide-stats .stat-item h3 {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--color-primary);
}

.slide-stats .stat-item p {
    font-size: var(--text-sm);
    opacity: 0.8;
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
}

/* 右侧装饰图形 */
.slide-illustration {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.illustration-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(37, 99, 235, 0.3);
}

.circle-1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    animation: rotate 30s linear infinite;
}

.circle-2 {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    border-color: rgba(59, 130, 246, 0.3);
    animation: rotate 25s linear infinite reverse;
}

.circle-3 {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border-color: rgba(96, 165, 250, 0.3);
    animation: rotate 20s linear infinite;
}

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

.tech-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background-color: var(--color-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: #ffffff;
    box-shadow: var(--shadow-2);
    animation: pulse 2s infinite;
}

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

/* 粒子背景 */
#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

/* 轮播指示器 */
.slider-indicators {
    position: absolute;
    bottom: var(--space-12);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    display: flex;
    gap: var(--space-3);
}

.indicator {
    width: 40px;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s;
}

.indicator.active,
.indicator:hover {
    background-color: var(--color-primary);
    width: 60px;
}

/* 轮播导航 */
.slider-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 var(--space-6);
    pointer-events: none;
}

.nav-btn {
    width: 48px;
    height: 48px;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: #ffffff;
    font-size: var(--text-lg);
    cursor: pointer;
    transition: all 0.2s;
    pointer-events: auto;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: #ffffff;
}

/* 响应式 */
@media (max-width: 992px) {
    .slide-title {
        font-size: var(--text-xl);
    }
    
    .slide-subtitle {
        font-size: var(--text-base);
    }
    
    .slide-illustration {
        display: none;
    }
    
    .slide-stats {
        gap: var(--space-6);
    }
}

@media (max-width: 768px) {
    .hero-slider {
        min-height: 600px;
        height: auto;
        padding: var(--space-12) 0;
    }
    
    .slide-content {
        padding: var(--space-8) 0;
    }
    
    .slide-title {
        font-size: 24px;
    }
    
    .slide-subtitle {
        font-size: var(--text-sm);
    }
    
    .slide-buttons {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .slide-stats {
        gap: var(--space-4);
        flex-wrap: wrap;
    }
    
    .slide-stats .stat-item h3 {
        font-size: var(--text-xl);
    }
    
    .nav-btn {
        width: 40px;
        height: 40px;
        font-size: var(--text-base);
    }
    
    .slider-indicators {
        bottom: var(--space-6);
    }
}

/* ========================================
   Partner Section
   ======================================== */
.partners-section {
    padding: var(--space-8) 0;
    background-color: var(--color-neutral-50);
    overflow: hidden;
}

.partners-track {
    width: 100%;
    overflow: hidden;
}

.partners-slide {
    display: flex;
    gap: var(--space-12);
    animation: scroll-partners 25s linear infinite;
    width: max-content;
}

.partner-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-2xl);
    color: var(--color-neutral-400);
    transition: color 0.2s;
    white-space: nowrap;
}

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

.partner-logo span {
    font-size: var(--text-base);
    font-weight: 500;
}

@keyframes scroll-partners {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
    margin-bottom: var(--space-12);
}

.section-badge {
    display: inline-block;
    padding: var(--space-2) var(--space-5);
    background-color: var(--color-neutral-100);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-4);
    line-height: 1.25;
}

.section-desc {
    color: var(--color-neutral-500);
    font-size: var(--text-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Services Section
   ======================================== */
.services-section {
    background-color: #ffffff;
    padding: var(--space-16) 0;
}

.service-card {
    padding: var(--space-8) var(--space-6);
    border-radius: var(--radius-md);
    background-color: #ffffff;
    border: 1px solid var(--color-neutral-200);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    height: 100%;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--color-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s;
}

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

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2);
    border-color: transparent;
}

.service-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-1);
}

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

.service-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    padding: var(--space-1) var(--space-3);
    background-color: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 600;
}

.service-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    background-color: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    color: #ffffff;
}

.service-card h3 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-3);
}

.service-card p {
    color: var(--color-neutral-500);
    font-size: var(--text-sm);
    margin-bottom: var(--space-5);
}

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

.service-features li {
    padding: var(--space-2) 0;
    color: var(--color-neutral-600);
    font-size: var(--text-sm);
}

.service-features li i {
    color: var(--color-success);
    margin-right: var(--space-2);
}

/* ========================================
   Why Choose Us Section
   ======================================== */
.why-section {
    background-color: var(--color-neutral-900);
    color: #ffffff;
    padding: var(--space-16) 0;
}

.why-section .section-badge {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-primary);
}

.why-section .section-title {
    color: #ffffff;
}

.why-section .section-desc {
    color: var(--color-neutral-400);
}

.why-card {
    padding: var(--space-8) var(--space-6);
    border-radius: var(--radius-md);
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s;
}

.why-card:hover {
    background-color: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.why-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    color: #ffffff;
}

.why-card h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: #ffffff;
}

.why-card p {
    color: var(--color-neutral-400);
    font-size: var(--text-sm);
    margin: 0;
}

/* ========================================
   Product & News Cards
   ======================================== */
.product-card,
.news-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: #ffffff;
    box-shadow: var(--shadow-1);
    transition: all 0.3s;
    border: 1px solid var(--color-neutral-200);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.product-card:hover,
.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2);
}

.product-card img,
.news-card img {
    height: 200px;
    object-fit: cover;
    width: 100%;
}

.card-body {
    padding: var(--space-6);
    flex: 1;
}

.card-title {
    font-weight: 600;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-4);
    font-size: var(--text-lg);
}

.btn-outline-primary {
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-5);
    font-weight: 500;
    color: var(--color-primary);
    background-color: transparent;
    transition: all 0.2s;
    font-size: var(--text-sm);
    text-decoration: none;
    display: inline-block;
}

.btn-outline-primary:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary {
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-6);
    font-weight: 600;
    transition: background-color 0.2s;
    color: #ffffff;
    text-decoration: none;
    display: inline-block;
    font-size: var(--text-sm);
}

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

/* ========================================
   Stats Section
   ======================================== */
.stats-section {
    background-color: var(--color-primary);
    padding: var(--space-16) 0;
}

.stat-item {
    text-align: center;
    padding: var(--space-8) var(--space-4);
}

.stat-number {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: #ffffff;
}

.stat-label {
    font-size: var(--text-base);
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* ========================================
   CTA Section
   ======================================== */
.cta-section {
    background-color: var(--color-neutral-50);
    padding: var(--space-16) 0;
}

.cta-card {
    background-color: var(--color-neutral-900);
    border-radius: var(--radius-lg);
    padding: var(--space-16) var(--space-12);
    position: relative;
    overflow: hidden;
}

.cta-card > * {
    position: relative;
    z-index: 2;
}

.cta-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    color: #ffffff;
    margin-bottom: var(--space-4);
}

.cta-desc {
    font-size: var(--text-lg);
    color: var(--color-neutral-400);
    margin-bottom: var(--space-8);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-cta-primary {
    background-color: var(--color-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    font-size: var(--text-base);
    transition: background-color 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.btn-cta-primary:hover {
    background-color: var(--color-primary-hover);
    color: #ffffff;
}

.btn-cta-outline {
    background-color: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-8);
    font-weight: 600;
    font-size: var(--text-base);
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.btn-cta-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
    color: #ffffff;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-neutral-800);
    color: var(--color-neutral-400);
    padding: var(--space-12) 0 var(--space-8);
}

.footer h5 {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: var(--space-4);
    font-size: var(--text-lg);
}

.footer a {
    color: var(--color-neutral-400);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer ul li {
    margin-bottom: var(--space-2);
}

.footer i {
    color: var(--color-primary);
}

/* ========================================
   Animations
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(var(--space-5));
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .section-title {
        font-size: var(--text-xl);
    }
    
    .navbar-collapse {
        background-color: var(--color-neutral-900);
        padding: var(--space-4);
        border-radius: var(--radius-md);
        margin-top: var(--space-4);
    }
    
    .language-switcher {
        margin-top: var(--space-4);
    }
    
    .slide-buttons {
        flex-direction: column;
    }
    
    .cta-card {
        padding: var(--space-12) var(--space-6);
    }
}

@media (max-width: 576px) {
    .hero-slider {
        min-height: 500px;
    }
    
    .slide-title {
        font-size: 24px;
    }
    
    .slide-buttons .btn {
        width: 100%;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
}