/* 全局样式重置 - 出版级标准 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 出版级字体系统 */
:root {
    /* 主要字体族 */
    --font-family-primary: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --font-family-secondary: 'Noto Sans SC', 'Helvetica Neue', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    
    /* 字号系统 - 符合出版规范 */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 3.75rem;     /* 60px */
    
    /* 行高系统 */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 1.75;
    
    /* 字重系统 */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* 颜色系统 */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;
    
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* 间距系统 */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    --spacing-32: 8rem;
}

body {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    padding-top: 70px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 - 出版级专业设计 */
.navbar {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
    border-bottom: 1px solid rgba(229, 231, 235, 0.6);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4) var(--spacing-5);
    max-width: 1400px;
}

.logo a {
    text-decoration: none;
}

.logo-text {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-800);
    letter-spacing: -0.025em;
    line-height: var(--line-height-tight);
    background: linear-gradient(135deg, var(--color-primary-800), var(--color-primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu ul {
    list-style: none;
    display: flex;
}

.nav-menu li {
    margin-left: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-gray-700);
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.01em;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: var(--spacing-2) 0;
}

.nav-menu a:hover,
.nav-menu li.active a {
    color: var(--color-primary-700);
}

.nav-menu li.active a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #1a365d;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 100%;
    height: 2px;
    background-color: #333;
    transition: all 0.3s ease;
}

/* Banner区域样式 */
.banner {
    background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-800) 50%, var(--color-primary-700) 100%);
    color: #fff;
    padding: var(--spacing-24) 0 var(--spacing-16);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 40%),
                radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.06) 0%, transparent 30%);
    opacity: 0.3;
    z-index: 0;
}

.banner-content {
    position: relative;
    z-index: 1;
}

.banner-content h1 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.025em;
    margin-bottom: var(--spacing-5);
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-content p {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-8);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.banner-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* 按钮样式 - 出版级专业设计 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: 8px;
    text-decoration: none;
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    outline: none;
    position: relative;
    overflow: hidden;
    min-height: 44px; /* 符合移动端触摸标准 */
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-500));
    color: white;
    border: 2px solid transparent;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-600));
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.btn-primary:focus {
    outline: 2px solid var(--color-primary-300);
    outline-offset: 2px;
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary:active {
    transform: translateY(0);
    background-color: rgba(255, 255, 255, 0.25);
}

.btn-secondary:focus {
    outline: 2px solid white;
    outline-offset: 2px;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary-700);
    border: 2px solid var(--color-primary-700);
}

.btn-outline:hover {
    background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-600));
    color: white;
    border-color: var(--color-primary-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.btn-outline:active {
    transform: translateY(0);
}

.btn-outline:focus {
    outline: 2px solid var(--color-primary-300);
    outline-offset: 2px;
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

/* 按钮动画效果 */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.btn:hover::before {
    transform: translateY(0);
}

/* 禁用状态 */
.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:disabled::before,
.btn.disabled::before {
    display: none;
}

/* 通用区块样式 */
section {
    padding: 80px 0;
}

.section-title {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.025em;
    text-align: center;
    margin-bottom: var(--spacing-12);
    color: var(--color-gray-900);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #1a365d, #3182ce);
}

/* 核心业务样式 - 出版级专业设计 */
.core-business {
    background: linear-gradient(to bottom, var(--color-gray-50) 0%, white 100%);
    position: relative;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.business-item {
    text-align: center;
    padding: var(--spacing-10) var(--spacing-8);
    background: linear-gradient(145deg, white, var(--color-gray-50));
    border-radius: 16px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(229, 231, 235, 0.8);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    position: relative;
    overflow: hidden;
}

.business-item:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15),
                0 8px 16px rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary-200);
}

.business-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-400));
    transform: scaleX(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: left;
}

.business-item:hover::before {
    transform: scaleX(1);
}

.business-icon {
    width: 96px;
    height: 96px;
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-500));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
    color: #fff;
    font-size: 40px;
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3),
                inset 0 2px 4px rgba(255, 255, 255, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.business-icon::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    transform: scale(0);
    transition: transform 0.6s ease;
}

.business-item:hover .business-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4),
                inset 0 2px 4px rgba(255, 255, 255, 0.3);
}

.business-item:hover .business-icon::after {
    transform: scale(1);
}

.business-item h3 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--spacing-4);
    color: var(--color-gray-900);
}

.business-item p {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-5);
    color: var(--color-gray-600);
}

.read-more {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-600);
    text-decoration: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: var(--spacing-1) 0;
}

.read-more:hover {
    color: var(--color-primary-700);
}

.read-more::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: currentColor;
    transition: width 0.3s ease;
}

.read-more:hover::after {
    width: 100%;
}

/* 企业优势样式 - 出版级专业设计 */
.company-advantage {
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
    position: relative;
    overflow: hidden;
}

.company-advantage::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary-200), transparent);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advantage-item {
    text-align: center;
    padding: var(--spacing-10) var(--spacing-8);
    background: linear-gradient(145deg, white, var(--color-gray-50));
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(229, 231, 235, 0.6);
    position: relative;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.03), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.advantage-item:hover::before {
    opacity: 1;
}

.advantage-item:hover {
    transform: translateY(-10px) scale(1.01);
    box-shadow: 0 16px 32px rgba(59, 130, 246, 0.12),
                0 4px 12px rgba(0, 0, 0, 0.06);
    border-color: var(--color-primary-200);
}

.advantage-item h3 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--spacing-4);
    color: var(--color-gray-900);
    position: relative;
    z-index: 1;
}

.advantage-item p {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
    color: var(--color-gray-600);
    position: relative;
    z-index: 1;
}

/* 教师专属服务样式 */
.teacher-services {
    background-color: #ffffff;
    border-left: 5px solid #3182ce;
    background: linear-gradient(135deg, #f0f7ff, #ffffff);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.teacher-services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3182ce, #63b3ed, #3182ce);
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.service-item {
    background-color: #f7fafc;
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
    padding: 30px;
    text-align: center;
}

.service-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(26, 54, 93, 0.12);
    border-color: #cbd5e0;
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1a365d, #2c5282);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: #fff;
    font-size: 32px;
    box-shadow: 0 4px 12px rgba(26, 54, 93, 0.2);
    transition: all 0.3s ease;
}

.service-icon:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 15px rgba(26, 54, 93, 0.3);
}

.service-item h3 {
    margin-bottom: 15px;
    color: #1a365d;
    font-weight: 600;
}

.service-category {
    color: #2c5282;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 15px;
}

.service-description {
    color: #4a5568;
    margin-bottom: 25px;
    line-height: 1.7;
}

.service-item .btn {
    margin: 0;
}

/* 数字教材推荐样式 - 出版级专业设计 */
.recommended-books {
    background: linear-gradient(to bottom, white 0%, var(--color-gray-50) 100%);
    position: relative;
    overflow: hidden;
}

.recommended-books::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary-200), transparent);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
    scroll-behavior: smooth;
    overflow-x: auto;
    padding: 10px 0;
    scrollbar-width: thin;
    scrollbar-color: #888 #f1f1f1;
}

.books-grid::-webkit-scrollbar {
    height: 8px;
}

.books-grid::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.books-grid::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}

.books-grid::-webkit-scrollbar-thumb:hover {
    background: #555;
}

.book-item {
    background: linear-gradient(145deg, white, var(--color-gray-50));
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(229, 231, 235, 0.8);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    position: relative;
}

.book-item:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.12),
                0 8px 16px rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary-200);
}

.book-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary-500), var(--color-primary-400));
    transform: scaleX(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: left;
}

.book-item:hover::before {
    transform: scaleX(1);
}

.book-cover {
    height: 220px;
    background: linear-gradient(135deg, var(--color-gray-200), var(--color-gray-300));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.book-cover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, 
        rgba(255, 255, 255, 0.1) 25%, 
        transparent 25%, 
        transparent 50%, 
        rgba(255, 255, 255, 0.1) 50%, 
        rgba(255, 255, 255, 0.1) 75%, 
        transparent 75%);
    background-size: 20px 20px;
    animation: shine 3s infinite linear;
}

@keyframes shine {
    0% { transform: translateX(-20px); }
    100% { transform: translateX(20px); }
}

.cover-placeholder {
    width: 85%;
    height: 85%;
    background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-600));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    font-weight: var(--font-weight-bold);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}

.book-item h3 {
    padding: var(--spacing-5) var(--spacing-5) var(--spacing-2);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    color: var(--color-gray-900);
}

.book-category {
    padding: 0 var(--spacing-5) var(--spacing-2);
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.book-description {
    padding: 0 var(--spacing-5) var(--spacing-5);
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-gray-600);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-5);
}

.book-item .btn {
    margin: 0 var(--spacing-5) var(--spacing-5);
    width: calc(100% - var(--spacing-10));
}

.view-more {
    text-align: center;
}

/* 行业动态样式 - 出版级专业设计 */
.latest-news {
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
    position: relative;
}

.latest-news::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary-200), transparent);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.news-item {
    background: linear-gradient(145deg, white, var(--color-gray-50));
    border-radius: 16px;
    padding: var(--spacing-6);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(229, 231, 235, 0.6);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    position: relative;
    overflow: hidden;
}

.news-item:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 16px 32px rgba(59, 130, 246, 0.1),
                0 4px 12px rgba(0, 0, 0, 0.06);
    border-color: var(--color-primary-200);
}

.news-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--color-primary-500), var(--color-primary-400));
    transform: scaleY(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: top;
}

.news-item:hover::before {
    transform: scaleY(1);
}

.news-date {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-600);
    margin-bottom: var(--spacing-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.news-item h3 {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--spacing-4);
    color: var(--color-gray-900);
}

.news-item p {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-5);
    color: var(--color-gray-600);
}

/* 合作机构样式 */
.cooperation-partners {
    background-color: #ffffff;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
    scroll-behavior: smooth;
    overflow-x: auto;
    padding: 10px 0;
    scrollbar-width: thin;
    scrollbar-color: #888 #f1f1f1;
}

.partners-grid::-webkit-scrollbar {
    height: 8px;
}

.partners-grid::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.partners-grid::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}

.partners-grid::-webkit-scrollbar-thumb:hover {
    background: #555;
}

.partner-item {
    text-align: center;
    padding: 30px 25px;
    background-color: #ffffff;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 2px solid #e2e8f0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    position: relative;
}

.partner-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(26, 54, 93, 0.15);
    border-color: #3182ce;
    background-color: #f7fafc;
}

.trusted-by {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #e6f0ff, #dbeafe);
    border-radius: 8px;
    border: 1px solid #c7d8ed;
}

.trust-text {
    font-size: 18px;
    font-weight: 500;
    color: #1a365d;
    margin: 0;
    text-align: center;
}

.partner-logo {
    width: 100px;
    height: 100px;
    background-color: #e2e8f0;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
}

.logo-placeholder {
    width: 80%;
    height: 80%;
    background: linear-gradient(135deg, #1a365d, #2c5282);
    border-radius: 4px;
}

.partner-item h3 {
    margin-bottom: 10px;
    color: #1a365d;
    font-weight: 600;
}

.partner-type {
    color: #4a5568;
    font-size: 14px;
}

/* 联系我们样式 */
.contact-us {
    background-color: #f7fafc;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    padding: 30px;
    background-color: #ffffff;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(26, 54, 93, 0.12);
    border-color: #cbd5e0;
}

.contact-item i {
    font-size: 24px;
    color: #2c5282;
    margin-right: 20px;
    margin-top: 5px;
}

.contact-item h3 {
    margin-bottom: 10px;
    color: #1a365d;
    font-weight: 600;
}

.contact-item p {
    color: #4a5568;
    line-height: 1.7;
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
    color: #ffffff;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    margin-bottom: 20px;
    color: #ffffff;
    font-weight: 600;
}

.footer-column p {
    color: #e2e8f0;
    margin-bottom: 10px;
    line-height: 1.7;
}

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

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #e2e8f0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-column ul li a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: #cbd5e0;
}

/* 移动端菜单样式 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: #ffffff;
    box-shadow: -5px 0 15px rgba(26, 54, 93, 0.1);
    z-index: 1100;
    transition: right 0.3s ease;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e2e8f0;
}

.mobile-logo {
    font-size: 18px;
    font-weight: bold;
    color: #1a365d;
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #2c3e50;
}

.mobile-nav ul {
    list-style: none;
    padding: 20px;
}

.mobile-nav li {
    margin-bottom: 20px;
}

.mobile-nav a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    display: block;
    padding: 10px 0;
    transition: color 0.3s ease;
}

.mobile-nav a:hover {
    color: #1a365d;
}

/* 响应式设计 - 出版级移动端优化 */
@media (max-width: 768px) {
    /* 导航栏优化 */
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
        width: 24px;
        height: 18px;
        z-index: 1001;
    }
    
    .mobile-menu-btn span {
        width: 100%;
        height: 2px;
        background-color: var(--color-gray-700);
        border-radius: 1px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    /* Banner区域移动端优化 */
    .banner {
        padding: var(--spacing-16) var(--spacing-4) var(--spacing-12);
    }
    
    .banner-content h1 {
        font-size: var(--font-size-3xl);
        line-height: var(--line-height-snug);
        margin-bottom: var(--spacing-4);
    }
    
    .banner-content p {
        font-size: var(--font-size-lg);
        line-height: var(--line-height-relaxed);
        margin-bottom: var(--spacing-6);
    }
    
    .banner-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-3);
    }
    
    .banner-buttons .btn {
        width: 100%;
        max-width: 280px;
        padding: var(--spacing-3) var(--spacing-6);
    }
    
    /* 标题优化 */
    .section-title {
        font-size: var(--font-size-2xl);
        line-height: var(--line-height-tight);
        margin-bottom: var(--spacing-8);
        padding: 0 var(--spacing-4);
    }
    
    /* 网格布局优化 */
    .business-grid,
    .advantage-grid,
    .services-grid,
    .books-grid,
    .news-grid,
    .partners-grid,
    .contact-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
        padding: 0 var(--spacing-4);
    }
    
    /* 卡片组件移动端优化 */
    .business-item,
    .advantage-item,
    .service-item,
    .news-item,
    .partner-item,
    .contact-item {
        padding: var(--spacing-6) var(--spacing-5);
        margin-bottom: 0;
    }
    
    .business-icon,
    .service-icon {
        width: 72px;
        height: 72px;
        font-size: 32px;
        margin-bottom: var(--spacing-4);
    }
    
    /* 间距优化 */
    section {
        padding: var(--spacing-12) 0;
    }
    
    .container {
        padding: 0 var(--spacing-4);
    }
    
    /* 数字出版模块响应式 */
    .publishing-process {
        flex-direction: column;
        gap: 30px;
    }
    
    .process-step {
        flex: none;
        width: 100%;
    }
    
    /* 数字教材模块响应式 */
    .textbook-detail-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .textbook-info {
        flex: none;
        width: 100%;
    }
    
    /* 行业动态模块响应式 */
    .news-detail-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .news-main {
        flex: none;
        width: 100%;
    }
    
    /* 合作机构模块响应式 */
    .cooperation-cases {
        flex-direction: column;
        gap: 30px;
    }
    
    .case-left,
    .case-right {
        flex: none;
        width: 100%;
    }
    
    /* 试用平台模块响应式 */
    .trial-form-container {
        flex-direction: column;
        gap: 30px;
    }
    
    .form-section,
    .process-section {
        flex: none;
        width: 100%;
    }
    
    /* 关于我们模块响应式 */
    .intro-content {
        flex-direction: column;
        text-align: center;
    }
    
    .intro-image {
        flex: none;
        width: 100%;
        height: 300px;
    }
    
    .intro-text {
        width: 100%;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: 60px !important;
        padding-right: 0 !important;
        text-align: left !important;
    }
    
    .timeline-dot {
        left: 20px !important;
        transform: none !important;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    /* 超小屏幕优化 */
    .banner {
        padding: var(--spacing-12) var(--spacing-3) var(--spacing-8);
    }
    
    .banner-content h1 {
        font-size: var(--font-size-2xl);
        line-height: var(--line-height-snug);
        margin-bottom: var(--spacing-3);
    }
    
    .banner-content p {
        font-size: var(--font-size-base);
        line-height: var(--line-height-relaxed);
        margin-bottom: var(--spacing-5);
    }
    
    .section-title {
        font-size: var(--font-size-xl);
        line-height: var(--line-height-tight);
        margin-bottom: var(--spacing-6);
        padding: 0 var(--spacing-3);
    }
    
    /* 卡片组件超紧凑优化 */
    .business-item,
    .advantage-item,
    .news-item,
    .partner-item,
    .contact-item {
        padding: var(--spacing-5) var(--spacing-4);
    }
    
    .service-item {
        padding: var(--spacing-5) var(--spacing-4);
    }
    
    .business-icon,
    .service-icon {
        width: 64px;
        height: 64px;
        font-size: 28px;
        margin-bottom: var(--spacing-3);
    }
    
    /* 更紧凑的移动端布局 */
    section {
        padding: var(--spacing-10) 0;
    }
    
    .footer-content {
        gap: var(--spacing-6);
        padding: 0 var(--spacing-3);
    }
    
    .footer {
        padding: var(--spacing-8) 0 var(--spacing-4);
    }
    
    .footer-column h3 {
        font-size: var(--font-size-lg);
        margin-bottom: var(--spacing-3);
    }
    
    .footer-column p,
    .footer-column li {
        font-size: var(--font-size-sm);
    }
    
    /* 按钮优化 */
    .btn {
        padding: var(--spacing-2) var(--spacing-4);
        font-size: var(--font-size-sm);
        min-height: 44px; /* 符合移动端触摸标准 */
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 240px;
        margin: 0 auto;
        display: block;
    }

/* 平板设备响应式 - 出版级优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 960px;
        padding: 0 var(--spacing-6);
    }
    
    .business-grid,
    .advantage-grid,
    .services-grid,
    .books-grid,
    .news-grid,
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-8);
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    /* 平板端卡片优化 */
    .business-item,
    .advantage-item,
    .service-item {
        padding: var(--spacing-8) var(--spacing-6);
    }
    
    .business-icon,
    .service-icon {
        width: 88px;
        height: 88px;
        font-size: 36px;
    }
    
    /* 平板端标题优化 */
    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-10);
    }
    
    .banner-content h1 {
        font-size: var(--font-size-4xl);
    }
    
    .banner-content p {
        font-size: var(--font-size-xl);
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.business-item,
.advantage-item,
.book-item,
.news-item,
.partner-item,
.contact-item {
    animation: fadeIn 0.6s ease forwards;
}

.business-item:nth-child(1) { animation-delay: 0.1s; }
.business-item:nth-child(2) { animation-delay: 0.2s; }
.business-item:nth-child(3) { animation-delay: 0.3s; }
.business-item:nth-child(4) { animation-delay: 0.4s; }

.advantage-item:nth-child(1) { animation-delay: 0.1s; }
.advantage-item:nth-child(2) { animation-delay: 0.2s; }
.advantage-item:nth-child(3) { animation-delay: 0.3s; }
.advantage-item:nth-child(4) { animation-delay: 0.4s; }

/* 修复数字对齐问题 */
.digital-text,
.phone-text {
    /* 用无衬线字体，数字基线对齐更稳定 */
    font-family: "Microsoft Yahei", Arial, sans-serif;
    /* 强制基线对齐，避免上下偏移 */
    vertical-align: baseline;
    /* 合理行高，避免行高导致的错位 */
    line-height: 1.5;
    /* 让数字等宽对齐，视觉更整齐 */
    font-variant-numeric: tabular-nums;
    /* 确保布局稳定 */
    display: inline-block;
}

/* 确保所有文本元素的数字对齐一致 */
p,
li {
    /* 用无衬线字体，数字基线对齐更稳定 */
    font-family: "Microsoft Yahei", Arial, sans-serif;
    /* 强制基线对齐，避免上下偏移 */
    vertical-align: baseline;
    /* 让数字等宽对齐，视觉更整齐 */
    font-variant-numeric: tabular-nums;
}

/* 确保图标和文本垂直居中对齐 */
.contact-item i {
    vertical-align: middle;
    margin-right: 8px;
}

/* 图标样式（使用CSS实现） */
.icon-book::before { content: '📚'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-textbook::before { content: '📖'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-platform::before { content: '💻'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-cooperation::before { content: '🤝'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-address::before { content: '📍'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-phone::before { content: '📞'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-email::before { content: '📧'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-qq::before { content: '💬'; font-size: inherit; line-height: 1; display: inline-block; }
.icon-website::before { content: '🌐'; font-size: inherit; line-height: 1; display: inline-block; }

/* 确保图标在容器中居中显示 */
.business-icon i,
.business-icon span,
.service-icon i,
.service-icon span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: inherit;
}

/* AI增强的视觉元素 */
.ai-enhanced-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: 400% 400%;
    animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.education-tech-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #fff;
    font-size: 40px;
    box-shadow: 0 8px 20px rgba(79, 172, 254, 0.3);
    transition: all 0.3s ease;
}

.education-tech-icon:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 25px rgba(79, 172, 254, 0.4);
}

.teacher-focus {
    border-left: 5px solid #3182ce;
    background: linear-gradient(135deg, #f0f7ff, #ffffff);
    padding: 25px;
    border-radius: 0 8px 8px 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    margin: 30px 0;
    position: relative;
    overflow: hidden;
}

.teacher-focus::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3182ce, #63b3ed, #3182ce);
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.partnership-badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.ai-badge {
    position: absolute;
    top: 5px;
    right: 5px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3px 8px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 10;
    text-align: center;
    min-width: 30px;
}

.authority-proof {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border: 2px solid #d4e0ef;
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.08);
}

.authority-proof h4 {
    color: #1a365d;
    margin: 0 0 10px 0;
    font-weight: 600;
}

.authority-proof p {
    color: #4a5568;
    margin: 0;
    font-size: 14px;
}

/* 移动端底部导航栏 */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 60px;
    z-index: 999;
    border-top: 1px solid #e0e0e0;
}

.mobile-bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #666;
    transition: all 0.3s ease;
    flex: 1;
    height: 100%;
}

.mobile-bottom-nav .nav-item.active {
    color: #667eea;
}

.mobile-bottom-nav .nav-icon {
    font-size: 20px;
    margin-bottom: 4px;
}

.mobile-bottom-nav .nav-text {
    font-size: 12px;
    font-weight: 500;
}

/* 确保页面内容不被底部导航栏遮挡 */
@media (max-width: 768px) {
    body {
        padding-bottom: 70px;
    }
}

/* 桌面端隐藏底部导航栏 */
@media (min-width: 769px) {
    .mobile-bottom-nav {
        display: none !important;
    }
}

/* 默认隐藏移动端底部导航栏，只在移动端显示 */
.mobile-bottom-nav {
    display: none;
}

@media (max-width: 768px) {
    .mobile-bottom-nav {
        display: flex;
    }
}

/* 无障碍访问性优化 */

/* 焦点样式优化 */
*:focus {
    outline: 2px solid var(--color-primary-400);
    outline-offset: 2px;
    border-radius: 4px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --color-primary-500: #0066cc;
        --color-primary-600: #0052a3;
        --color-primary-700: #003d7a;
    }
    
    .btn-primary {
        border: 3px solid var(--color-primary-800);
    }
    
    .btn-outline {
        border-width: 3px;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .business-item:hover,
    .advantage-item:hover,
    .book-item:hover,
    .news-item:hover {
        transform: none;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-gray-50: #111827;
        --color-gray-100: #1f2937;
        --color-gray-200: #374151;
        --color-gray-300: #4b5563;
        --color-gray-400: #6b7280;
        --color-gray-500: #9ca3af;
        --color-gray-600: #d1d5db;
        --color-gray-700: #e5e7eb;
        --color-gray-800: #f3f4f6;
        --color-gray-900: #f9fafb;
    }
    
    body {
        background-color: var(--color-gray-900);
        color: var(--color-gray-100);
    }
    
    .navbar {
        background-color: rgba(17, 24, 39, 0.98);
        border-bottom-color: rgba(55, 65, 81, 0.6);
    }
    
    .business-item,
    .advantage-item,
    .news-item,
    .book-item {
        background: linear-gradient(145deg, var(--color-gray-800), var(--color-gray-700));
        border-color: var(--color-gray-600);
    }
}

/* 屏幕阅读器优化 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 键盘导航优化 */
.keyboard-navigation .nav-menu a:focus,
.keyboard-navigation .btn:focus {
    box-shadow: 0 0 0 3px var(--color-primary-300),
                0 0 0 5px rgba(59, 130, 246, 0.3);
}

/* 触摸目标最小尺寸 */
.touch-target {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* 表单无障碍优化 */
.form-control {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-base);
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--color-gray-300);
    border-radius: 8px;
    transition: all 0.2s ease;
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-label {
    font-family: var(--font-family-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-2);
    display: block;
}

/* 加载状态指示 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-gray-200);
    border-radius: 50%;
    border-top-color: var(--color-primary-500);
    animation: spin 1s ease-in-out infinite;
}

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

/* 错误状态样式 */
.error {
    color: #dc2626;
    border-color: #fecaca !important;
    background-color: #fef2f2;
}

.error-text {
    color: #dc2626;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-2);
}

/* 成功状态样式 */
.success {
    color: #16a34a;
    border-color: #bbf7d0 !important;
    background-color: #f0fdf4;
}

/* 警告状态样式 */
.warning {
    color: #ca8a04;
    border-color: #fef08a !important;
    background-color: #fefce8;
}

/* 信息状态样式 */
.info {
    color: #0ea5e9;
    border-color: #bae6fd !important;
    background-color: #f0f9ff;
}

/* 性能优化 */
/* 硬件加速 */
.transform {
    will-change: transform;
    backface-visibility: hidden;
    perspective: 1000px;
}

/* 滚动优化 */
.smooth-scroll {
    scroll-behavior: smooth;
}

/* 文本渲染优化 */
.text-optimize {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* 打印样式优化 */
@media print {
    .navbar,
    .mobile-bottom-nav,
    .btn {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .section-title {
        page-break-after: avoid;
    }
    
    .business-item,
    .advantage-item,
    .news-item {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* 跨浏览器兼容性 */
/* WebKit特定样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

/* Firefox特定样式 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-gray-300) var(--color-gray-100);
}

/* IE/Edge特定样式 */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
    .btn::before {
        display: none;
    }
    
    .business-item::before,
    .advantage-item::before {
        display: none;
    }
}

/* 旧版浏览器降级 */
.no-js .btn:hover::before,
.no-cssgrid .business-grid {
    display: block;
}

/* 移动端触摸优化 */
@media (hover: none) and (pointer: coarse) {
    .btn:hover:not(:active) {
        transform: none;
        box-shadow: none;
    }
    
    .business-item:hover:not(:active),
    .advantage-item:hover:not(:active) {
        transform: none;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    }
}

/* 高DPI屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .business-icon,
    .service-icon {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* 修复语法错误 */
/* 确保所有媒体查询正确闭合 */