/* ============================================
   主样式文件 - 魅咨科技企业官网
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --primary-bg: #0A1929;
    --secondary-bg: #1A2332;
    --gradient-start: #667EEA;
    --gradient-end: #764BA2;
    --accent-color: #00D9FF;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B8C4;
    --text-muted: #6B7280;
    --card-bg: rgba(26, 35, 50, 0.6);
    --card-bg-hover: rgba(26, 35, 50, 0.8);
    --border-color: rgba(102, 126, 234, 0.3);

    /* Typography */
    --font-display: 'Poppins', sans-serif;
    --font-body: 'Noto Sans SC', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;

    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.5);
    --blur-bg: blur(10px);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ============================================
   Base Styles
   ============================================ */

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

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

body {
    font-family: var(--font-body);
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

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

ul {
    list-style: none;
}

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

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* ============================================
   Layout Components
   ============================================ */

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

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

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.title-underline {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    margin: var(--spacing-sm) auto;
    border-radius: 2px;
}

.section-subtitle {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

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

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

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 25, 41, 0.8);
    backdrop-filter: var(--blur-bg);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 25, 41, 0.95);
    box-shadow: var(--shadow-lg);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--spacing-xs) 0;
}

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

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

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

.nav-link.active {
    color: var(--accent-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: radial-gradient(ellipse at bottom, #1B2735 0%, #090A0F 100%);
}

#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
    padding: var(--spacing-xl);
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-line {
    display: block;
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
}

.title-subtitle {
    display: block;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 4px;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    animation: bounce 2s infinite;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--text-secondary);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 6px;
    height: 10px;
    background: var(--accent-color);
    border-radius: 3px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 1.5s infinite;
}

.scroll-indicator span {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* ============================================
   About Section
   ============================================ */

.about-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(180deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.about-intro {
    margin-bottom: var(--spacing-md);
}

.intro-highlight {
    font-size: 1.3rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.intro-highlight .highlight {
    color: var(--accent-color);
    font-weight: 600;
}

.about-description {
    margin-bottom: var(--spacing-xl);
}

.about-description p {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-secondary);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.stat-item:hover {
    background: var(--card-bg-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.stat-icon {
    flex-shrink: 0;
}

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

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.about-locations {
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.locations-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.locations-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.location-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 217, 255, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0, 217, 255, 0.3);
    transition: var(--transition-normal);
}

.location-item:hover {
    background: rgba(0, 217, 255, 0.2);
    transform: translateX(4px);
}

.location-item span {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* ============================================
   Services Section
   ============================================ */

.services-section {
    padding: var(--spacing-xxl) 0;
    background: var(--primary-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

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

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--gradient-start);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.service-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.service-description {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

/* ============================================
   Products Section
   ============================================ */

.products-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(180deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
}

.products-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.product-card {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
    border-color: var(--gradient-start);
}

.product-image {
    position: relative;
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-placeholder {
    opacity: 0.8;
}

.product-content {
    padding: var(--spacing-lg);
}

.product-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--accent-color);
}

.product-tags {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid rgba(102, 126, 234, 0.5);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.tag:hover {
    background: rgba(102, 126, 234, 0.3);
    border-color: var(--gradient-start);
}

.product-description {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

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

.feature span {
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* ============================================
   Contact Section
   ============================================ */

.contact-section {
    padding: var(--spacing-xxl) 0;
    background: var(--primary-bg);
}

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

.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(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.contact-card:hover {
    background: var(--card-bg-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--accent-color);
}

.contact-details p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.contact-details p:last-child {
    margin-bottom: 0;
}

.contact-message {
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.contact-message h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(10, 25, 41, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--gradient-start);
    background: rgba(10, 25, 41, 0.8);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.btn-submit {
    width: 100%;
    margin-top: var(--spacing-sm);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: linear-gradient(180deg, var(--secondary-bg) 0%, #050A14 100%);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

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

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
}

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

.footer-column a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.footer-column a:hover {
    color: var(--text-primary);
    transform: translateX(4px);
}

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

.copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* ============================================
   Utility Classes
   ============================================ */

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

.bg-gradient {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.glass-effect {
    background: rgba(10, 25, 41, 0.8);
    backdrop-filter: var(--blur-bg);
    border: 1px solid var(--border-color);
}

/* ============================================
   Animations (Keyframes)
   ============================================ */

@keyframes gradientShift {
    0%, 100% {
        background: linear-gradient(135deg, #667EEA, #764BA2, #00D9FF);
        background-clip: text;
        -webkit-background-clip: text;
    }
    50% {
        background: linear-gradient(135deg, #00D9FF, #667EEA, #764BA2);
        background-clip: text;
        -webkit-background-clip: text;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scrollWheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(15px);
    }
}