/* 神眼图片官网 - 苹果风格CSS - 性能优化版本 */

/* 性能优化 */
* {
    box-sizing: border-box;
}

/* 全局性能优化 */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    transform: translateZ(0); /* 强制硬件加速 */
    backface-visibility: hidden;
    perspective: 1000px;
}

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

/* 减少重绘和回流 - 扩展更多元素 */
.feature-card, .gallery-item, .phantom-item, .hero-slide, .nav-link {
    will-change: transform;
    transform: translateZ(0); /* 硬件加速 */
    backface-visibility: hidden;
}

/* 优化动画性能 */
.hero-slider, .gallery-image, .phantom-modal {
    contain: layout style paint;
}

/* 基础重置和变量 */
:root {
    /* 苹果风格颜色 */
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;

    /* 中性色 */
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #C7C7CC;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FBFBFD;

    /* 边框和分割线 */
    --border-color: #E5E5E7;
    --divider-color: #D2D2D7;

    /* 阴影 */
    --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 8px 32px rgba(0, 0, 0, 0.12);

    /* 圆角 */
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
    --radius-xl: 24px;

    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 48px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* 动画 - 优化性能 */
    --transition-fast: 0.12s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    margin: 0;
    padding: 0;
    overflow-x: hidden; /* 防止水平滚动 */
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}



/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    will-change: transform;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    text-decoration: none;
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-small);
    object-fit: contain;
}

/* 如果图标加载失败，隐藏img元素 */
.logo-img[src=""], .logo-img:not([src]) {
    display: none;
}

/* 备用文字logo样式 */
.logo-text-only {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-fast);
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}



.btn-download {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-large);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.btn-download:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* 英雄区域 */
.hero {
    padding: 120px 0 var(--spacing-3xl); /* 恢复原始顶部间距 */
    background: linear-gradient(135deg, var(--background-tertiary) 0%, var(--background-secondary) 100%);
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.title-main {
    display: block;
    color: var(--text-primary);
}

.title-highlight {
    display: block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-large);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-large);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: var(--transition-normal);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.btn-special {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: linear-gradient(135deg, #ff6b35 0%, #ff8c42 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-large);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: var(--transition-normal);
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
    border: none;
    cursor: pointer;
}

.btn-special:hover {
    background: linear-gradient(135deg, #ff8c42 0%, #ff6b35 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

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

/* 英雄视觉区域 */
.hero-visual {
    position: relative;
}

.hero-image-container {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-large);
    max-width: 100%;
    aspect-ratio: 16 / 10;
}

.hero-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;

}

/* 英雄轮播样式 */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100%;
}
.hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity var(--transition-slow);
}
.hero-slide.active {
    opacity: 1;
}
.hero-slide-img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}
/* 箭头按钮 */
.hero-slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.35);
    color: #fff;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    z-index: 2;
}
.hero-slider-arrow:hover {
    background: rgba(0,0,0,0.5);
}
.hero-slider-arrow.prev { left: 12px; }
.hero-slider-arrow.next { right: 12px; }
/* 指示点 */
.hero-slider-dots {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 10px;
    display: flex;
    gap: 8px;
    z-index: 2;
}
.hero-slider-dots .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.6);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}
.hero-slider-dots .dot.active {
    background: #fff;
    transform: scale(1.15);
}

/* 修复：避免英雄轮播被装饰卡片遮挡（隐藏装饰性浮动卡片） */
.hero-image-container .floating-card {
    display: none !important; /* 纯装饰，隐藏以确保不遮挡图片内容 */
}

/* 确保浮动卡片正常覆盖轮播 */
.floating-card { z-index: 3; pointer-events: none; }

/* 浮动卡片 */
.floating-card {
    position: absolute;
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
    max-width: min(48%, 260px);
}

.card-1 { top: 8%; right: 6%; animation-delay: 0s; }
.card-2 { top: 26%; left: 6%; animation-delay: 0.5s; }
.card-3 { bottom: 26%; right: 6%; animation-delay: 1s; }
.card-4 { bottom: 8%; left: 6%; animation-delay: 1.5s; }

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

.card-icon {
    font-size: var(--font-size-lg);
}

.card-text {
    display: none;
}

/* 通用区域样式 */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

/* 功能特性区域 */
.features {
    background: var(--background-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

/* 响应式设计 - 在中等屏幕上调整为2列 */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
}

.feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-small);
    transition: var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.feature-icon {
    margin-bottom: var(--spacing-md);
}

.icon-bg {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    color: white;
}

.icon-bg-1 { background: linear-gradient(135deg, #FF6B6B, #FF8E8E); }
.icon-bg-2 { background: linear-gradient(135deg, #4ECDC4, #44A08D); }
.icon-bg-3 { background: linear-gradient(135deg, #45B7D1, #96C93D); }
.icon-bg-4 { background: linear-gradient(135deg, #F093FB, #F5576C); }

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
    font-size: var(--font-size-sm);
    flex-grow: 1;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: 600;
}

/* 技术优势区域 */
.technology {
    background: var(--background-primary);
}

.tech-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.tech-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.tech-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

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

.tech-feature {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.tech-feature-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.tech-feature-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tech-feature-content p {
    color: var(--text-secondary);
}

.tech-visual {
    position: relative;
}

.tech-image-container {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-large);
    background: #f5f5f5;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.tech-image {
    width: 100%;
    height: auto;
    display: block;
}

/* 案例展示区域 */

/* 幻影坦克区域：复用 gallery 样式 */
.phantom {
    background: var(--background-secondary);
}

.phantom-item {
    background-color: #fff; /* 默认白色背景 */
    cursor: pointer;
}

/* 切换状态：黑色背景 */
.phantom-item.dark {
    background-color: #000;
}

/* 视觉提示：右上角“点击切换” */
.phantom-hint {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    line-height: 1;
    pointer-events: none;
    z-index: 2;
    transition: var(--transition-normal);
}

/* 幻影坦克模态框 */
.phantom-modal {
    position: fixed;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
    box-sizing: border-box;
    margin: 0 !important;
    transform: none !important;
}

.phantom-modal.active {
    opacity: 1;
    visibility: visible;
}

/* 确保模态框在最顶层 */
.phantom-modal {
    isolation: isolate;
}

/* 强制模态框在当前视口中央，不影响页面滚动 */
.phantom-modal.active {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 999999 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    /* 确保模态框不受页面滚动影响 */
    transform: translateZ(0) !important;
    backface-visibility: hidden !important;
    /* 强制覆盖所有可能的干扰样式 */
    margin: 0 !important;
    padding: 20px !important;
    box-sizing: border-box !important;
    background: rgba(0, 0, 0, 0.95) !important;
    opacity: 1 !important;
    visibility: visible !important;
}

.phantom-modal-content {
    position: relative;
    max-width: calc(100vw - 40px);
    max-height: calc(100vh - 40px);
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 300px;
    min-height: 200px;
}

.phantom-modal-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
    object-fit: contain;
    object-position: center;
}

.phantom-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 255, 255, 0.9);
    color: #000;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    z-index: 10001;
}

.phantom-modal-close:hover {
    background: #fff;
    transform: scale(1.1);
}

.phantom-modal-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.9);
    color: #000;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    pointer-events: none;
}

/* 移动端幻影坦克模态框优化 */
@media (max-width: 768px) {
    .phantom-modal {
        padding: 10px;
    }

    .phantom-modal-content {
        max-width: calc(100vw - 20px);
        max-height: calc(100vh - 20px);
        min-width: 280px;
        border-radius: 4px;
    }

    .phantom-modal-close {
        top: 10px;
        right: 10px;
        width: 36px;
        height: 36px;
        font-size: 18px;
    }

    .phantom-modal-hint {
        bottom: 15px;
        font-size: 12px;
        padding: 6px 12px;
    }
}

.gallery {
    background: var(--background-secondary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

/* 响应式设计 - 在中等屏幕上调整为2列 */
@media (max-width: 1200px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-normal);
    height: 280px;
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.gallery-image {
    position: relative;
    overflow: hidden;
    height: 100%;
}

.gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* 更平滑的缩放与滤镜过渡 */
    transition: transform var(--transition-slow), filter var(--transition-slow);
    transform-origin: center center;
    will-change: transform;
}

.gallery-item:hover .gallery-image img {
    /* 放大 1.12 倍，兼顾视觉效果与容器边界 */
    transform: scale(1.12);
    /* 轻微阴影增强层次（不会影响布局）*/
    filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.12));
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
    transform: translateY(100%);
    transition: var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-overlay h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.gallery-overlay p {
    font-size: var(--font-size-xs);
    opacity: 0.9;
    margin: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu,
    .nav-actions {
        display: none;
    }

    .nav-menu.active,
    .nav-actions.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: var(--shadow-medium);
        padding: var(--spacing-lg);
        border-top: 1px solid var(--border-color);
        z-index: 1000;
    }

    .nav-menu.active {
        gap: var(--spacing-md);
    }

    .nav-menu.active li {
        width: 100%;
    }

    .nav-menu.active .nav-link {
        display: block;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active .nav-link:last-child {
        border-bottom: none;
    }

    .nav-actions.active {
        gap: var(--spacing-md);
        margin-top: var(--spacing-md);
        padding-top: var(--spacing-md);
        border-top: 1px solid var(--border-color);
    }

    .hamburger {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

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

    .hero-stats {
        justify-content: center;
    }

    .floating-card {
        display: none;
    }

    .tech-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}











/* 下载卡片样式 */
.download-card {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 28px 24px;
    position: relative;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 260px;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow:
        0 3px 16px rgba(0, 0, 0, 0.05),
        0 1px 3px rgba(0, 0, 0, 0.03),
        inset 0 1px 0 rgba(255, 255, 255, 0.7);
    overflow: hidden;
}

.download-card:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow:
        0 16px 48px rgba(0, 122, 255, 0.15),
        0 6px 20px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 122, 255, 0.3);
}

.download-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    position: relative;
}

.download-header h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.version {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
    padding: 16px 0;
}

.version-number {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-color);
    margin: 0 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #5856D6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.download-features {
    list-style: none;
    margin: 32px 0;
    flex-grow: 1;
    padding: 0;
}

.download-features ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.download-features li {
    padding: 12px 0;
    color: var(--text-primary);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    position: relative;
    padding-left: 28px;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
    line-height: 1.4;
}

.download-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 12px;
    color: #34C759;
    font-weight: 700;
    font-size: 14px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(52, 199, 89, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
}

.download-features li:last-child {
    border-bottom: none;
}

.download-footer {
    margin-top: auto;
    padding-top: 24px;
}

.download-btn {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, #5856D6 100%);
    color: white;
    padding: 14px 24px;
    border-radius: 14px;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow:
        0 4px 16px rgba(0, 122, 255, 0.3),
        0 1px 4px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.download-btn:hover {
    transform: translateY(-2px) scale(1.01);
    box-shadow:
        0 8px 24px rgba(0, 122, 255, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.1);
}

/* 下载模态框样式 */
.download-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-out;
}

.download-modal-content {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-large);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-out;
}

.download-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.download-modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.download-modal-close {
    font-size: 24px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-small);
    transition: var(--transition-fast);
}

.download-modal-close:hover {
    color: var(--text-primary);
    background: var(--background-tertiary);
}

.download-modal-body {
    padding: var(--spacing-lg);
}

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

.download-option {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-large);
    cursor: pointer;
    transition: var(--transition-normal);
    background: var(--background-primary);
}

.download-option:hover {
    border-color: var(--primary-color);
    background: var(--background-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.download-option-icon {
    font-size: 32px;
    margin-right: var(--spacing-md);
}

.download-option-text h4 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
}

.download-option-text p {
    margin: 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .download-modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }

    .download-option {
        padding: var(--spacing-md);
    }

    .download-option-icon {
        font-size: 24px;
        margin-right: var(--spacing-sm);
    }
}

/* 下载区域 */
.download {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: #1a1a1a;
    text-align: center;
}

.download-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.download-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.7;
    margin-bottom: var(--spacing-xl);
    color: #4a5568;
}

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

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: white;
    border: 2px solid #e0e0e0;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-large);
    color: #1a1a1a;
    text-decoration: none;
    transition: var(--transition-normal);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.download-btn:hover {
    background: #f8f9fa;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.15);
}

.download-icon {
    font-size: var(--font-size-2xl);
}

.download-platform {
    display: block;
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.download-version {
    display: block;
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.download-info {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.info-label {
    opacity: 0.8;
}

.info-value {
    font-weight: 600;
}



/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    max-width: 300px;
}

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

.footer-logo img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-small);
}

.footer-logo span {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.icp-link {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: var(--transition-fast);
    border-bottom: 1px solid transparent;
}

.icp-link:hover {
    color: rgba(255, 255, 255, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-info {
        flex-direction: column;
        gap: var(--spacing-sm);
    }



    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* 内容展示区域 */
.content-section {
    background: var(--background-primary);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

@media (max-width: 1200px) {
    .content-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
}

.content-card {
    background: white;
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-small);
    transition: var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.content-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--background-secondary);
}

.content-body {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.content-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.content-type-badge {
    background: var(--primary-color);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-small);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.content-card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

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

.content-card-title a:hover {
    color: var(--primary-color);
}

.content-excerpt {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.content-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-top: auto;
}

.content-tag {
    background: var(--background-secondary);
    color: var(--text-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-small);
    font-size: var(--font-size-xs);
    text-decoration: none;
    transition: var(--transition-fast);
}

.content-tag:hover {
    background: var(--primary-color);
    color: white;
}

.content-actions {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.btn-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-large);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-normal);
}

.btn-more:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.content-loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-secondary);
}

/* ===== 内容页面专用样式 ===== */
.content-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-normal);
}

.content-nav .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.content-nav .nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    text-decoration: none;
}

.content-nav .nav-links {
    display: flex;
    gap: var(--spacing-xl);
}

.content-nav .nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.content-nav .nav-links a:hover,
.content-nav .nav-links a.active {
    color: var(--primary-color);
}

.content-nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-fast);
}

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

.content-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 120px 0 var(--spacing-3xl);
    text-align: center;
}

.content-hero h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.content-hero .subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.content-filters {
    background: var(--background-tertiary);
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.filter-label {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 60px;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.content-main-section {
    padding: var(--spacing-3xl) 0;
}

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

.content-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-3xl);
}

.content-list {
    display: grid;
    gap: var(--spacing-xl);
}

.content-item {
    background: white;
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-fast);
    border: 1px solid var(--border-color);
}

.content-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

.content-item-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

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

.content-item-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.content-item-title a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.3;
}

.content-item-title a:hover {
    color: var(--primary-color);
}

.content-item-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

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

.content-item-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.content-views {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.content-sidebar {
    display: grid;
    gap: var(--spacing-xl);
    height: fit-content;
}

.sidebar-section {
    background: white;
    border-radius: var(--radius-large);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.sidebar-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-list li {
    margin-bottom: var(--spacing-sm);
}

.sidebar-list a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-medium);
    transition: var(--transition-fast);
}

.sidebar-list a:hover {
    background: var(--background-tertiary);
    color: var(--primary-color);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.pagination a {
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.pagination a:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination a.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 单个内容页面 */
.single-content {
    max-width: 960px; /* 原800px → 960px，给视频更大展示空间 */
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-large);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-medium);
}

.single-content-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-color);
}

.single-content-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.single-content-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.single-content-body {
    line-height: 1.8;
    color: var(--text-primary);
}

.single-content-body h2,
.single-content-body h3,
.single-content-body h4 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.single-content-body p {
    margin-bottom: var(--spacing-md);
}

.single-content-body ul,
.single-content-body ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.single-content-body li {
    margin-bottom: var(--spacing-xs);
}

.single-content-body code {
    background: var(--background-tertiary);
    padding: 2px 6px;
    border-radius: var(--radius-small);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.single-content-body pre {
    background: var(--background-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-medium);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

/* 视频教程区域样式 */
.video-tutorial-section {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl);
    background: var(--background-secondary);
    border-radius: var(--radius-large);
    border: 1px solid var(--border-color);
}

.video-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 960px; /* 与正文宽度一致，增大桌面端展示面积 */
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    aspect-ratio: 16 / 9; /* 自适应16:9视频 */
}

.bilibili-video {
    width: 100%;
    height: 100%; /* 由容器的aspect-ratio控制高度 */
    border: none;
    border-radius: var(--radius-medium);
}

.video-description {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* 响应式视频 */
@media (max-width: 768px) {
    .bilibili-video {
        height: 100%; /* 跟随容器比例 */
    }

    .video-tutorial-section {
        padding: var(--spacing-lg);
        margin: var(--spacing-xl) 0;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .content-layout {
        grid-template-columns: 1fr;
    }

    .content-sidebar {
        order: -1;
    }

    .content-nav .nav-links {
        display: none;
    }

    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }
}
/* 性能优化样式 */
.lazy {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy.loaded {
    opacity: 1;
}

/* 减少重绘 */
.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

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

/* 优化滚动性能 */
* {
    scroll-behavior: auto; /* 禁用CSS滚动，使用JS控制 */
}

/* 减少paint和layout */
.hero-slider-arrow,
.phantom-modal-close {
    transform: translateZ(0);
    will-change: transform;
}

/* 优化字体渲染 */
h1, h2, h3, h4, h5, h6 {
    text-rendering: optimizeSpeed;
}

p, span, div {
    text-rendering: optimizeSpeed;
}

/* 减少复合层 */
.gallery-item:hover,
.feature-card:hover {
    transform: translateY(-4px) translateZ(0);
}