/* ============================================
   智能手机使用指南 - 主样式表 (现代化版本)
   ============================================ */

/* CSS变量 - 浅色主题 (现代化配色) */
:root {
    /* 主色调 - 温暖的蓝色系 */
    --primary-color: #3b82f6;
    --primary-light: #60a5fa;
    --primary-dark: #2563eb;
    --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    
    /* 辅助色 */
    --secondary-color: #10b981;
    --secondary-light: #34d399;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --purple-color: #8b5cf6;
    --pink-color: #ec4899;
    
    /* 背景色 - 更柔和的色调 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-sidebar: #f8fafc;
    --bg-hover: #e2e8f0;
    
    /* 文字色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* 边框和阴影 */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-color: rgba(0, 0, 0, 0.08);
    
    /* 尺寸 */
    --header-height: 64px;
    --sidebar-width: 320px;
    --transition-speed: 0.25s;
    --transition-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* 字体和圆角 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --border-radius: 16px;
    --border-radius-lg: 20px;
    --border-radius-xl: 24px;
    --border-radius-sm: 12px;
    --border-radius-xs: 8px;
}

/* CSS变量 - 深色主题 (现代化深色) */
[data-theme="dark"] {
    --primary-color: #60a5fa;
    --primary-light: #93c5fd;
    --primary-dark: #3b82f6;
    --primary-gradient: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-sidebar: #1e293b;
    --bg-hover: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --border-light: #1e293b;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

/* 移除按钮触摸时的默认轮廓 */
button {
    -webkit-tap-highlight-color: transparent;
}

button:focus {
    outline: none;
}

button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   顶部导航栏 (现代化设计)
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(var(--bg-primary-rgb, 255, 255, 255), 0.85);
    border-bottom: 1px solid rgba(var(--border-color-rgb, 229, 231, 235), 0.5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: background 0.3s ease;
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.85);
    border-bottom-color: rgba(51, 65, 85, 0.5);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-speed);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0;
    gap: 5px;
}

.menu-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.menu-line {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 散开动效 - 带倾斜 (仅非触摸设备) */
@media (hover: hover) {
    .menu-toggle:hover .menu-line-top {
        transform: translateY(-3px) rotate(-5deg);
    }

    .menu-toggle:hover .menu-line-middle {
        transform: scaleX(0.8);
    }

    .menu-toggle:hover .menu-line-bottom {
        transform: translateY(3px) rotate(5deg);
    }
}

/* 点击动效 - 触摸设备 */
.menu-toggle:active .menu-line-top {
    transform: translateY(-3px) rotate(-5deg);
}

.menu-toggle:active .menu-line-middle {
    transform: scaleX(0.8);
}

.menu-toggle:active .menu-line-bottom {
    transform: translateY(3px) rotate(5deg);
}

/* 合并动效 */
.menu-toggle .menu-line {
    transition: all 0.3s ease;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-icon {
    width: 1.6rem;
    height: 1.6rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 搜索框现代化 */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box input {
    width: 200px;
    height: 44px;
    padding: 10px 42px 10px 18px;
    border: 2px solid var(--border-color);
    border-radius: 28px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: width 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    width: 280px;
}

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

.search-btn {
    position: absolute;
    right: 6px;
    background: var(--primary-color);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: white;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
}

.search-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* 主题切换按钮现代化 */
.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.theme-toggle .theme-icon {
    font-size: 1.3rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
    transform: rotate(15deg) scale(1.05);
}

/* 移动端字体和搜索切换按钮 - 默认隐藏 */
.font-toggle-mobile,
.search-toggle-mobile {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    align-items: center;
    justify-content: center;
    padding: 0;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.9rem;
}

.font-toggle-mobile:hover,
.search-toggle-mobile:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.font-toggle-mobile:active,
.search-toggle-mobile:active {
    transform: scale(0.96);
}

.font-toggle-mobile.active,
.search-toggle-mobile.active {
    background: var(--primary-gradient);
    border-color: var(--primary-color);
    color: white;
}

/* 字体图标SVG */
.font-toggle-mobile {
    position: relative;
}

.font-toggle-mobile .font-icon-svg {
    width: 30px;
    height: 30px;
    display: none;
    transition: opacity 0.2s ease;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.font-toggle-mobile .font-icon-svg.active {
    display: block;
}

/* SVG图标悬停动画 */
.font-toggle-mobile:hover .font-icon-svg,
.search-toggle-mobile:hover svg {
    animation: iconBounce 0.6s ease;
}

@keyframes iconBounce {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.15); }
}

.search-toggle-mobile:hover svg {
    animation: iconRotate 0.6s ease;
}

@keyframes iconRotate {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(15deg) scale(1.1); }
    100% { transform: rotate(0deg) scale(1); }
}

@keyframes fontSwitch {
    0% { transform: scale(1) rotate(0deg); opacity: 1; }
    50% { transform: scale(0.5) rotate(180deg); opacity: 0.5; }
    100% { transform: scale(1) rotate(360deg); opacity: 1; }
}

/* ============================================
   侧边栏导航 (现代化设计)
   ============================================ */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 900;
    transition: transform var(--transition-speed);
}

.nav-menu {
    padding: 16px 0;
}

.nav-section {
    margin-bottom: 8px;
    padding: 0 12px;
}

.nav-title {
    padding: 12px 16px 8px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}

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

.nav-list li {
    margin: 2px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-speed);
    border-radius: var(--border-radius-xs);
    margin: 2px 0;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--primary-color);
    transform: translateX(4px);
}

.nav-link.active {
    background: var(--primary-gradient);
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.nav-link.active:hover {
    transform: translateX(0);
}

/* 阅读进度条现代化 */
.reading-progress {
    position: sticky;
    bottom: 0;
    background: var(--bg-sidebar);
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
}

.progress-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 10px;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 10px;
    transition: width 0.4s var(--transition-bounce);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

.progress-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================
   主内容区域
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
    padding: 32px;
    transition: margin-left var(--transition-speed);
}

/* 搜索结果现代化 */
.search-results {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 28px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
}

.search-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.close-search {
    background: var(--bg-secondary);
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 8px 14px;
    border-radius: var(--border-radius-xs);
    transition: all var(--transition-speed);
}

.close-search:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.search-result-item {
    padding: 16px;
    border-bottom: 1px solid var(--border-light);
    cursor: pointer;
    transition: all var(--transition-speed);
    border-radius: var(--border-radius-xs);
}

.search-result-item:hover {
    background: var(--bg-secondary);
    transform: translateX(8px);
}

.search-result-item h4 {
    color: var(--primary-color);
    margin-bottom: 6px;
    font-size: 1.1rem;
}

.search-result-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.highlight {
    background: rgba(59, 130, 246, 0.15);
    color: var(--primary-dark);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

/* 内容区域现代化 */
.content-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 36px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    animation: fadeInUp 0.5s var(--transition-bounce);
}

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

.section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.section-icon {
    font-size: 2.2rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.section-title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.section-content {
    color: var(--text-secondary);
}

.section-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

/* 介绍卡片现代化 */
.intro-card {
    background: var(--primary-gradient);
    color: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    margin-bottom: 28px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.intro-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.intro-card h3 {
    font-size: 1.4rem;
    margin-bottom: 24px;
    font-weight: 600;
    position: relative;
}

.feature-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
    position: relative;
}

.feature-list li {
    font-size: 1.05rem;
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.intro-tip {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-left: none;
    padding: 24px;
    border-radius: var(--border-radius);
    color: #92400e;
    margin-top: 24px;
}

[data-theme="dark"] .intro-tip {
    background: linear-gradient(135deg, #451a03 0%, #78350f 100%);
    color: #fcd34d;
}

.intro-tip strong {
    display: block;
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.intro-tip ul {
    margin: 0;
    padding-left: 24px;
}

.intro-tip li {
    margin-bottom: 8px;
    line-height: 1.7;
}

/* 步骤指南现代化 */
.step-guide {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.step-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

.step-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.step-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.step-number {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
}

.step-header h4 {
    font-size: 1.3rem;
    color: var(--text-primary);
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-content p {
    margin-bottom: 10px;
    line-height: 1.8;
}

.step-content ul {
    margin: 12px 0 12px 24px;
}

.step-content li {
    margin-bottom: 6px;
}

/* 交互式演示按钮现代化 */
.interactive-demo {
    margin-top: 20px;
}

.demo-btn {
    padding: 14px 32px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 28px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-speed);
    box-shadow: var(--shadow-md);
}

.demo-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 0 20px rgba(59, 130, 246, 0.3);
}

.demo-btn:active {
    transform: translateY(-1px);
}

/* 电话拨号演示现代化 */
.phone-demo {
    margin-top: 24px;
    display: flex;
    justify-content: center;
}

.phone-screen {
    background: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
    padding: 28px;
    border-radius: 28px;
    width: 300px;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255,255,255,0.1);
}

.phone-display {
    background: rgba(255,255,255,0.1);
    color: white;
    padding: 18px;
    border-radius: 14px;
    font-size: 1.6rem;
    text-align: center;
    min-height: 60px;
    margin-bottom: 20px;
    letter-spacing: 3px;
    font-weight: 600;
    backdrop-filter: blur(8px);
}

.phone-keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.key {
    aspect-ratio: 1;
    background: rgba(255,255,255,0.1);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.4rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 600;
}

.key:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

.key:active {
    transform: scale(0.95);
}

.call-btn {
    width: 100%;
    padding: 14px;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 28px;
    font-size: 1.15rem;
    cursor: pointer;
    margin-bottom: 12px;
    transition: all var(--transition-speed);
    font-weight: 600;
}

.call-btn:hover {
    background: var(--secondary-light);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.clear-btn {
    width: 100%;
    padding: 12px;
    background: transparent;
    color: var(--text-muted);
    border: 2px solid var(--border-color);
    border-radius: 24px;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 500;
}

.clear-btn:hover {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

/* 短信演示现代化 */
.sms-demo {
    margin-top: 24px;
    display: flex;
    justify-content: center;
}

.sms-screen {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    padding: 24px;
    border-radius: var(--border-radius-lg);
    width: 340px;
    box-shadow: var(--shadow-lg);
}

.sms-header {
    text-align: center;
    padding-bottom: 18px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 18px;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.sms-input-group {
    margin-bottom: 18px;
}

.sms-input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.sms-to {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1.05rem;
    background: var(--bg-secondary);
    transition: all var(--transition-speed);
}

.sms-to:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.sms-body {
    margin-bottom: 18px;
}

.sms-message {
    width: 100%;
    height: 120px;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    background: var(--bg-secondary);
    transition: all var(--transition-speed);
}

.sms-message:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.send-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.05rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    font-weight: 600;
}

.send-btn:hover {
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

/* WiFi演示现代化 */
.wifi-demo {
    margin-top: 24px;
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--border-radius);
}

.wifi-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.wifi-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

.wifi-item:hover {
    border-color: var(--primary-color);
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.wifi-item.locked {
    opacity: 0.7;
}

.wifi-name {
    font-weight: 600;
    font-size: 1.05rem;
}

/* 浏览器演示现代化 */
.browser-demo {
    margin-top: 24px;
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--border-radius);
}

.browser-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-primary);
    padding: 12px 18px;
    border-radius: 28px;
    border: 2px solid var(--border-color);
    transition: all var(--transition-speed);
}

.browser-bar:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.browser-secure {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.browser-url {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-primary);
}

.browser-url:focus {
    outline: none;
}

.browser-go {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition-speed);
}

.browser-go:hover {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* 应用商店演示现代化 */
.app-store-demo {
    margin-top: 24px;
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--border-radius);
}

.app-item {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 20px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-speed);
    border: 2px solid transparent;
}

.app-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.app-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-gradient);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    box-shadow: var(--shadow-md);
}

.app-info {
    flex: 1;
}

.app-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.app-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.app-install-btn {
    padding: 10px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition-speed);
}

.app-install-btn:hover {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    transform: translateY(-2px);
}

/* 相机提示现代化 */
.camera-tips {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    padding: 24px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    border: 1px solid var(--border-color);
}

.camera-tips h5 {
    color: var(--text-primary);
    margin-bottom: 14px;
    font-size: 1.15rem;
    font-weight: 700;
}

.camera-tips ul {
    margin: 0;
    padding-left: 24px;
}

.camera-tips li {
    margin-bottom: 8px;
    line-height: 1.7;
}

/* 设置网格现代化 */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.setting-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-speed);
    cursor: pointer;
}

.setting-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.setting-icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 12px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.setting-name {
    display: block;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    font-size: 1.05rem;
}

.setting-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 提示框现代化 */
.tip-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
    border-left: 4px solid var(--accent-color);
    padding: 20px 24px;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    margin-top: 20px;
}

/* FAQ列表现代化 */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-speed);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 22px;
    cursor: pointer;
    font-weight: 700;
    color: var(--text-primary);
    transition: all var(--transition-speed);
    font-size: 1.1rem;
}

.faq-question:hover {
    background: var(--bg-hover);
}

.faq-icon {
    font-size: 1.3rem;
}

.faq-answer {
    padding: 0 22px 22px 56px;
    display: none;
}

.faq-answer.active {
    display: block;
    animation: slideDown 0.3s var(--transition-bounce);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.faq-answer ol {
    padding-left: 24px;
}

.faq-answer li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 技巧卡片网格现代化 */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.tip-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 28px;
    transition: all var(--transition-speed);
    border: 1px solid var(--border-color);
}

.tip-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
    border-color: var(--primary-light);
}

.tip-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.tip-icon {
    font-size: 1.8rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.tip-header h4 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

.tip-card p {
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 1rem;
    line-height: 1.7;
}

/* 底部导航现代化 */
.bottom-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    margin-top: 36px;
    border-top: 2px solid var(--border-color);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 28px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: all var(--transition-speed);
    font-weight: 600;
}

.nav-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.page-indicator {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 600;
    padding: 10px 24px;
    background: var(--bg-secondary);
    border-radius: 20px;
}

/* 模态框现代化 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-xl);
    width: 100%;
    max-width: 640px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.3s var(--transition-bounce);
    border: 1px solid var(--border-color);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    font-weight: 700;
}

.modal-close {
    background: var(--bg-secondary);
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 8px 14px;
    border-radius: var(--border-radius-xs);
    transition: all var(--transition-speed);
}

.modal-close:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.modal-body {
    padding: 28px;
    overflow-y: auto;
    max-height: calc(85vh - 90px);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

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

/* ============================================
   SVG 图标系统样式
   ============================================ */

.icon-svg {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.2em;
    height: 1.2em;
    vertical-align: middle;
    margin: 0 0.1em;
}

.icon-svg svg {
    width: 100%;
    height: 100%;
    color: inherit;
}

/* 导航菜单中的图标 */
.nav-link .icon-svg {
    width: 1.3em;
    height: 1.3em;
    margin-right: 0.3em;
}

/* 章节标题中的图标 */
.section-icon .icon-svg {
    width: 2.2rem;
    height: 2.2rem;
}

/* 图片说明中的图标 */
.image-caption .icon-svg {
    width: 1em;
    height: 1em;
}

/* ============================================
   图片画廊样式 (现代化)
   ============================================ */

.image-gallery-section {
    margin-top: 48px;
    padding-top: 36px;
    border-top: 2px solid var(--border-color);
}

.image-gallery-header {
    text-align: center;
    margin-bottom: 28px;
}

.image-gallery-header h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 700;
}

.image-gallery-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.gallery-item {
    cursor: pointer;
    transition: all var(--transition-speed);
}

.gallery-item:hover {
    transform: translateY(-6px);
}

.gallery-image-wrapper {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 3/4;
    box-shadow: var(--shadow);
}

.gallery-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 100%);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    opacity: 0;
    transition: all var(--transition-speed);
    padding-bottom: 20px;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-item:hover .gallery-image-wrapper img {
    transform: scale(1.08);
}

.gallery-zoom {
    font-size: 1.8rem;
    color: white;
    background: var(--primary-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.gallery-caption {
    text-align: center;
    padding: 14px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================
   灯箱样式 (现代化)
   ============================================ */

.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.95);
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    opacity: 1;
}

.lightbox-content {
    position: relative;
    width: 90%;
    height: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-image-wrapper {
    position: relative;
    max-width: 80%;
    max-height: 85%;
}

.lightbox-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
}

.lightbox-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.2rem;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: rotate(90deg);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    color: white;
    font-size: 1.6rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
    left: 24px;
}

.lightbox-next {
    right: 24px;
}

.lightbox-caption {
    position: absolute;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.6);
    padding: 14px 28px;
    border-radius: 28px;
    color: white;
    display: flex;
    gap: 24px;
    align-items: center;
    backdrop-filter: blur(8px);
    font-size: 1.05rem;
}

.lightbox-page {
    font-weight: 600;
}

.lightbox-counter {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}