/* 言乐科技企业级专业样式 */

/* ===== 全局重置和变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 确保HTML和body元素占满全屏 */
html {
    width: 100%;
    min-height: 100%;
    overflow-x: hidden;
}

body {
    width: 100%;
    min-height: 100%;
    overflow-x: hidden;
}

:root {
    /* 企业品牌色彩 */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #0ea5e9;
    
    /* 功能性颜色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    /* 中性色彩 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 过渡 */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ===== 基础样式 ===== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    box-sizing: border-box;
}

/* ===== 专业导航栏 ===== */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    box-sizing: border-box;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo h2 {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
}

.nav-logo::before {
    content: '🚀';
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: translateX(-50%);
    transition: var(--transition-normal);
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
}

.nav-link.active::before {
    width: 80%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: 8px;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    z-index: 1001;
    position: relative;
}

.nav-toggle:hover {
    background: var(--gray-100);
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background: var(--gray-600);
    border-radius: 2px;
    transition: var(--transition-normal);
}

.nav-toggle.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
    background: var(--primary-color);
}

.nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
    background: var(--primary-color);
}

/* ===== 英雄区域 ===== */
.hero {
    padding: 8rem 0 4rem 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.1));
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero p {
    font-size: 1.5rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto 2rem auto;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-image {
    position: absolute;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    z-index: 1;
}

.placeholder-image {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.1;
}

.placeholder-image i {
    font-size: 120px;
    color: white;
}

/* ===== 特性区域 ===== */
.features {
    padding: 5rem 0;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: flex;
    justify-content: center;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.feature-card {
    text-align: center;
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition-normal);
    min-width: 280px;
    flex: 0 1 auto;
}

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

.feature-card i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== 产品区域 ===== */
.products {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--gray-50), white);
}

.products h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.products-grid {
    display: flex;
    justify-content: center;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.product-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition-normal);
    min-width: 320px;
    flex: 0 1 auto;
}

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

.product-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
}

.product-icon i {
    font-size: 2.5rem;
    color: white;
}

.product-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.product-card p {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.btn-outline {
    padding: 12px 24px;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-normal);
    display: inline-block;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== 解决方案区域 ===== */
.solutions {
    padding: 5rem 0;
    background: white;
}

.solutions h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.solutions-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.solution-item {
    background: linear-gradient(135deg, var(--gray-50), white);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition-normal);
}

.solution-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.solution-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.solution-item p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===== 联系我们区域 ===== */
.contact {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--gray-50), white);
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
    width: 100%;
    box-sizing: border-box;
}

.contact-info {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--radius-md);
}

.info-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    width: 30px;
}

.info-item span {
    color: var(--gray-700);
    font-weight: 500;
}

.contact-form {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    font-size: 1rem;
    transition: var(--transition-normal);
    background: var(--gray-50);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.contact-form button {
    width: 100%;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 0 2rem 0;
    margin-top: 5rem;
    text-align: center;
}

.footer p {
    color: var(--gray-400);
    margin: 0;
}
.footer .icp-number {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* ===== 专业按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

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

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

.btn-secondary {
    background: var(--gray-600);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: var(--gray-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-info:hover {
    background: #0891b2;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== 卡片样式 ===== */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2rem;
    transition: var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ===== 表单样式 ===== */
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-normal);
    background: var(--gray-50);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 0 2rem 0;
    margin-top: 5rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.footer-section p,
.footer-section ul {
    color: var(--gray-300);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--gray-300);
    text-decoration: none;
    transition: var(--transition-normal);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--gray-700);
    color: var(--gray-400);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    /* 基础容器调整 */
    .container {
        padding: 0 15px;
        max-width: 100%;
    }
    
    /* 导航栏容器调整 */
    .nav-container {
        padding: 1rem 15px;
    }
    
    /* 导航菜单 */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
        gap: 0;
        z-index: 999;
        height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 0.5rem 0;
        padding: 0.5rem 0;
    }

    .nav-link {
        display: block;
        padding: 1rem;
        font-size: 1.1rem;
    }

    .nav-toggle {
        display: flex;
        background: var(--gray-100);
    }

    .nav-toggle:hover {
        background: var(--gray-200);
    }

    /* 英雄区域 */
    .hero {
        padding: 6rem 0 3rem 0;
    }

    .hero h1 {
        font-size: 2rem;
        line-height: 1.3;
    }

    .hero p {
        font-size: 1rem;
        margin: 1rem auto 2rem auto;
        padding: 0 20px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .hero-buttons .btn {
        width: 200px;
    }

    /* 特征和产品区域 */
    .features-grid,
    .products-grid {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
        padding: 0 15px;
    }

    .feature-card,
    .product-card {
        min-width: auto;
        width: 100%;
        max-width: 350px;
        padding: 2rem;
    }

    /* 解决方案区域 */
    .solutions-content {
        max-width: 100%;
        padding: 0 15px;
    }

    .solution-item {
        margin-bottom: 1.5rem;
        padding: 1.5rem;
    }

    /* 联系人区域 - 重要修复 */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 0 15px;
        max-width: 100%;
    }

    .contact-info,
    .contact-form {
        width: 100%;
        max-width: 100%;
    }

    .contact-form input,
    .contact-form textarea {
        font-size: 16px; /* 防止iOS缩放 */
    }

    .contact-form button {
        width: 100%;
    }

    .info-item {
        padding: 0.8rem;
        margin-bottom: 1rem;
    }

    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 0 15px;
    }

    /* 通用间距调整 */
    section {
        padding: 3rem 0;
    }

    h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
}

/* 超小屏幕额外优化 */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 0.9rem;
    }

    .feature-card,
    .product-card {
        padding: 1.5rem;
    }

    .feature-card i,
    .product-icon i {
        font-size: 3rem;
    }

    .product-icon {
        width: 80px;
        height: 80px;
    }

    .contact-content {
        padding: 0 10px;
    }

    .contact-info,
    .contact-form {
        padding: 1.5rem;
    }
}

/* ===== 动画和微交互 ===== */
.fade-in {
    animation: fadeIn var(--transition-normal) ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in {
    animation: slideIn var(--transition-normal) ease-out;
}

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

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ===== 选择文本样式 ===== */
::selection {
    background: var(--primary-color);
    color: white;
}

/* ===== 焦点样式 ===== */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== 加载动画 ===== */
.spinner {
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.flex-column { flex-direction: column; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.position-relative { position: relative; }
.position-absolute { position: absolute; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-danger { color: var(--danger-color); }
.text-info { color: var(--info-color); }

.bg-primary { background: var(--primary-color); }
.bg-secondary { background: var(--secondary-color); }
.bg-success { background: var(--success-color); }
.bg-warning { background: var(--warning-color); }
.bg-danger { background: var(--danger-color); }
.bg-info { background: var(--info-color); }