/* ========================================
   艾元数据官网 - 公共样式
   主色调：深空黑 #0D1117 | 高级灰 #1E2028
   点缀色：暖橙 #D97706
   ======================================== */

/* ===== 基础重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg-primary: #0D1117;
    --color-bg-secondary: #1E2028;
    --color-bg-card: rgba(45, 48, 58, 0.6);
    --color-accent: #D97706;
    --color-accent-hover: #F59E0B;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B0B8C4;
    --color-text-muted: #6B7280;
    --color-border: rgba(255, 255, 255, 0.12);
    --glass-bg: rgba(45, 48, 58, 0.5);
    --glass-border: rgba(255, 255, 255, 0.12);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --shadow-glow: 0 0 60px rgba(217, 119, 6, 0.25);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Han Sans CN', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Helvetica, Arial, sans-serif;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

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

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

/* ===== 容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

@media (min-width: 1280px) {
    .container {
        max-width: 1280px;
    }
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(13, 17, 23, 0.98);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.logo-svg {
    width: 40px;
    height: 40px;
}

.logo-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.logo-tagline {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.2;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-item a {
    display: block;
    padding: 8px 16px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.nav-item a:hover,
.nav-item a.active {
    color: var(--color-accent);
    background: rgba(217, 119, 6, 0.1);
}

.nav-cta {
    padding: 10px 24px;
    background: var(--color-accent);
    color: white;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: var(--transition-fast);
    margin-left: 16px;
}

.nav-cta:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: 8px;
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    outline: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(217, 119, 6, 0.05);
}

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

.btn-outline:hover {
    background: var(--color-accent);
    color: white;
}

/* ===== 玻璃态卡片 ===== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    transition: var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(217, 119, 6, 0.3);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

/* ===== 页面标题区域 ===== */
.page-header {
    padding: 160px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, rgba(217, 119, 6, 0.1) 0%, transparent 50%);
}

.page-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #FFFFFF 0%, #9CA3AF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 章节标题 ===== */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(217, 119, 6, 0.1);
    color: var(--color-accent);
    font-size: 14px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 16px;
    border: 1px solid rgba(217, 119, 6, 0.2);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.section-desc {
    font-size: 18px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 网格布局 ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--color-bg-secondary);
    padding: 80px 0 40px;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin-top: 16px;
    font-size: 15px;
    line-height: 1.7;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: var(--transition-fast);
}

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

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 14px;
}

.footer-contact {
    margin-top: 16px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
}

/* ===== 表单样式 ===== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 14px 16px;
    background: rgba(30, 30, 30, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: var(--color-text-primary);
    font-size: 15px;
    transition: var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

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

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.8s ease forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
        border-bottom: 1px solid var(--glass-border);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-item a {
        padding: 12px 16px;
        width: 100%;
    }
    
    .nav-cta {
        margin-left: 0;
        margin-top: 8px;
        width: 100%;
        text-align: center;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .page-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
}

/* ===== 特色样式 ===== */
.text-gradient {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-accent {
    color: var(--color-accent);
}

.divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    border-radius: 2px;
    margin: 24px 0;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(217, 119, 6, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
    border-left: 4px solid var(--color-accent);
    padding: 20px 24px;
    border-radius: 0 12px 12px 0;
    margin: 24px 0;
}

/* ===== 数据卡片 ===== */
.data-card {
    text-align: center;
    padding: 32px 24px;
}

.data-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 8px;
}

.data-label {
    font-size: 15px;
    color: var(--color-text-secondary);
}

/* ===== 标签样式 ===== */
.tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(217, 119, 6, 0.1);
    color: var(--color-accent);
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    margin-right: 8px;
    margin-bottom: 8px;
}

/* ===== 进度条 ===== */
.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin: 16px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    border-radius: 4px;
    transition: width 1s ease;
}

/* ===== 网站备案信息 ===== */
.beian-section {
    margin-top: 8px;
}

.beian-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

.beian-item:hover {
    color: var(--color-accent);
}

.beian-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.beian-separator {
    margin: 0 12px;
    opacity: 0.4;
}

@media (max-width: 640px) {
    .beian-section {
        display: flex;
        flex-direction: column;
        gap: 4px;
    }
    .beian-separator {
        display: none;
    }
}