/* ================================================
   Beijing Jingcheng Qice Enterprise Management Co., Ltd.
   Main Stylesheet
   ================================================ */

/* CSS Variables */
:root {
    --primary-color: #0066cc;
    --primary-dark: #004d99;
    --primary-light: #3399ff;
    --secondary-color: #ff6600;
    --secondary-dark: #cc5200;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --background-light: #f5f7fa;
    --background-white: #ffffff;
    --border-color: #e0e6ed;
    --success-color: #28a745;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 40px rgba(0, 102, 204, 0.15);
    --transition-fast: 0.3s ease;
    --transition-normal: 0.5s ease;
    --transition-slow: 0.8s ease;
    --font-primary: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

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

ul, ol {
    list-style: none;
}

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

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

input, textarea {
    font-family: inherit;
    outline: none;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }

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

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo svg {
    width: 50px;
    height: 50px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-menu a {
    font-weight: 500;
    color: var(--text-primary);
    padding: 10px 0;
    position: relative;
    overflow: hidden;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    background: transparent;
}

.mobile-menu-btn span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: 40px;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.3s;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.6s;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.9s;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 102, 204, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.4);
}

/* Hero Background Animation */
.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 20s infinite;
}

.floating-shape:nth-child(1) {
    width: 300px;
    height: 300px;
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.floating-shape:nth-child(2) {
    width: 200px;
    height: 200px;
    top: 50%;
    right: -100px;
    animation-delay: 2s;
}

.floating-shape:nth-child(3) {
    width: 250px;
    height: 250px;
    bottom: -125px;
    left: 30%;
    animation-delay: 4s;
}

.floating-shape:nth-child(4) {
    width: 180px;
    height: 180px;
    top: 20%;
    left: 20%;
    animation-delay: 6s;
}

.floating-shape:nth-child(5) {
    width: 220px;
    height: 220px;
    bottom: 20%;
    right: 15%;
    animation-delay: 8s;
}

/* Sections */
.section {
    padding: 120px 0;
}

.section-dark {
    background: var(--background-light);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 30px auto 0;
}

/* Service Cards */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.service-card {
    background: white;
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.service-card:hover .service-icon {
    transform: rotate(10deg) scale(1.1);
}

.service-icon svg {
    width: 40px;
    height: 40px;
    fill: white;
}

.service-card h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Features Section */
.features-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-top: 60px;
}

.feature-item {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-10px);
}

.feature-number {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff, #e0e6ed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-item h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.feature-item p {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* App Showcase */
.app-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-top: 80px;
}

.app-preview {
    position: relative;
}

.app-phone {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: block;
    filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.2));
}

.app-content h3 {
    font-size: 2.5rem;
    margin-bottom: 30px;
}

.app-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.8;
}

.app-features {
    display: grid;
    gap: 20px;
    margin-top: 40px;
}

.app-feature-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--background-light);
    border-radius: 15px;
    transition: all var(--transition-fast);
}

.app-feature-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.app-feature-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.app-feature-icon svg {
    width: 25px;
    height: 25px;
    fill: white;
}

.app-feature-item h5 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.app-feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Stats Section */
.stats-section {
    background: var(--background-light);
    padding: 100px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 50px;
}

.stat-item {
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.news-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.news-image {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.news-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: inherit;
    opacity: 0.8;
}

.news-content {
    padding: 30px;
}

.news-date {
    font-size: 0.9rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.news-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    line-height: 1.4;
}

.news-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    color: var(--primary-color);
    font-weight: 600;
}

.news-link:hover {
    gap: 15px;
}

/* Culture Section */
.culture-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 80px;
}

.culture-card {
    text-align: center;
    padding: 60px 40px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.culture-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.culture-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-normal);
}

.culture-card:hover .culture-icon {
    transform: rotate(20deg) scale(1.1);
}

.culture-icon svg {
    width: 60px;
    height: 60px;
    fill: white;
}

.culture-card h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.culture-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Contact Section */
.contact-section {
    background: var(--background-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    margin-top: 60px;
}

.contact-info {
    padding: 50px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--background-light);
    border-radius: 15px;
    transition: all var(--transition-fast);
}

.contact-item:hover {
    background: white;
    box-shadow: var(--shadow-sm);
    transform: translateX(10px);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 25px;
    height: 25px;
    fill: white;
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.contact-item p {
    color: var(--text-secondary);
}

.contact-form {
    padding: 50px;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 2rem;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.form-btn {
    width: 100%;
    padding: 18px;
    background: var(--primary-color);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 10px;
    transition: all var(--transition-fast);
}

.form-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
    background: #1a1a2e;
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-links h4 {
    font-size: 1.2rem;
    margin-bottom: 25px;
    color: white;
}

.footer-links ul li {
    margin-bottom: 15px;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
}

.footer-links ul li a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
}

.footer-legal {
    display: flex;
    gap: 30px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

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

/* Legal Pages */
.legal-page {
    padding-top: 120px;
    padding-bottom: 80px;
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 60px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.legal-content h1 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    text-align: center;
}

.legal-content h2 {
    font-size: 1.8rem;
    margin-top: 50px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.legal-content h3 {
    font-size: 1.4rem;
    margin-top: 30px;
    margin-bottom: 15px;
}

.legal-content p {
    margin-bottom: 20px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.legal-content ul {
    margin-bottom: 20px;
    padding-left: 30px;
}

.legal-content ul li {
    margin-bottom: 10px;
    line-height: 1.8;
    color: var(--text-secondary);
    list-style-type: disc;
}

.legal-content ul ul {
    margin-top: 10px;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow-lg);
    padding: 20px;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

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

.mobile-menu a {
    display: block;
    padding: 15px 20px;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu a:hover {
    background: var(--background-light);
    color: var(--primary-color);
}

/* Responsive Styles */
@media (max-width: 1200px) {
    .container {
        padding: 0 30px;
    }

    h1 { font-size: 3rem; }
    h2 { font-size: 2.2rem; }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }

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

    .mobile-menu {
        display: block;
    }

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

    .hero p {
        font-size: 1.2rem;
    }

    .app-showcase {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .culture-values {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .section {
        padding: 80px 0;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.5rem; }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

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

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

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

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .legal-content {
        padding: 40px 20px;
    }
}

/* Loading Animation */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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