/* ============================================
   现代化设计系统 - 参考IQGeniusLab AI风格
   ============================================ */

/* 导入现代字体 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* CSS变量定义 */
:root {
    /* 主色调 - 霓虹蓝紫色（深色科技风） */
    --primary-color: #60a5fa;
    --primary-dark: #1d4ed8;
    --primary-light: #93c5fd;
    --primary-lighter: #bfdbfe;
    --primary-ultra-light: rgba(96, 165, 250, 0.12);
    
    /* 辅助色 - 品红 / 祖母绿 / 琥珀 */
    --secondary-color: #22c55e;
    --secondary-dark: #15803d;
    --secondary-light: #4ade80;
    --accent-color: #f97316;
    --accent-pink: #e879f9;
    
    /* 文本颜色（深色背景下的对比色） */
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-light: #6b7280;
    --text-white: #f9fafb;
    
    /* 背景颜色（深色系） */
    --bg-primary: #020617;        /* 整体背景：接近黑蓝 */
    --bg-secondary: #020617;      /* 过渡区保持一致，靠渐变区分 */
    --bg-tertiary: #020617;
    --bg-dark: #020617;
    --bg-card: rgba(15, 23, 42, 0.96);  /* 卡片深色玻璃 */
    
    /* 渐变（更偏赛博感） */
    --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #6366f1 35%, #a855f7 70%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #22c55e 50%, #eab308 100%);
    --gradient-hero: radial-gradient(circle at top, rgba(56, 189, 248, 0.28), transparent 55%),
                     radial-gradient(circle at 15% 80%, rgba(236, 72, 153, 0.24), transparent 55%),
                     radial-gradient(circle at 85% 60%, rgba(34, 197, 94, 0.24), transparent 55%),
                     linear-gradient(135deg, #020617 0%, #020617 60%, #020617 100%);
    --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #6366f1 40%, #a855f7 75%, #f97316 100%);
    --gradient-soft: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(129, 140, 248, 0.12) 50%, rgba(236, 72, 153, 0.10) 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-colored: 0 10px 30px -5px rgba(99, 102, 241, 0.3);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 容器 */
    --container-width: 1280px;
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

/* 背景氛围：更炫酷但依然轻量 */
body::before {
    content: '';
    position: fixed;
    inset: -20%;
    z-index: -1;
    background:
        radial-gradient(circle at 12% 15%, rgba(99, 102, 241, 0.20), transparent 45%),
        radial-gradient(circle at 88% 20%, rgba(236, 72, 153, 0.16), transparent 45%),
        radial-gradient(circle at 60% 92%, rgba(16, 185, 129, 0.12), transparent 50%),
        radial-gradient(circle at 30% 80%, rgba(245, 158, 11, 0.10), transparent 45%);
    filter: blur(24px);
    transform: translateZ(0);
    opacity: 0.9;
    animation: auroraMove 18s ease-in-out infinite;
    pointer-events: none;
}

@keyframes auroraMove {
    0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
    50% { transform: translate3d(2%, -2%, 0) scale(1.04); }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
    body::before {
        animation: none !important;
    }
}

/* ============================================
   容器
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ============================================
   头部导航
   ============================================ */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 55%),
                radial-gradient(circle at top right, rgba(236, 72, 153, 0.16), transparent 55%),
                rgba(15, 23, 42, 0.94);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.25);
    z-index: 1000;
    transition: var(--transition-base);
}

header.scrolled {
    box-shadow: var(--shadow-md);
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 55%),
                radial-gradient(circle at top right, rgba(236, 72, 153, 0.16), transparent 55%),
                rgba(15, 23, 42, 0.96);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.logo-icon {
    flex-shrink: 0;
    width: 40px;
    height: auto;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.logo-text h1,
.logo h1 {
    font-size: 1.875rem;
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.3;
    margin: 0;
    letter-spacing: -0.02em;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
    .logo-text h1,
    .logo h1 {
        background: none;
        -webkit-background-clip: initial;
        background-clip: initial;
        color: var(--text-white);
        -webkit-text-fill-color: var(--text-white);
    }
}

.logo-text p,
.logo p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.01em;
    opacity: 0.85;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 240px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    overflow-x: auto;
    padding-bottom: 4px;
}

@media (max-width: 1024px) {
    .logo-text p {
        display: none;
    }
}

nav ul li a {
    color: var(--text-white);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.87rem;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: var(--transition-base);
    white-space: nowrap;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-base);
}

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

nav ul li a:hover::after,
nav ul li a.active::after {
    width: 100%;
}

/* 导航下拉菜单 */
.nav-dropdown {
    position: relative;
}

.nav-dropdown > a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.nav-dropdown > a::before {
    content: "▾";
    font-size: 0.8em;
    opacity: 0.9;
    order: 2;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    min-width: 220px;
    list-style: none;
    padding: 10px 12px;
    margin: 0;
    display: none;
    background: rgba(15, 23, 42, 0.98);
    border: 1px solid rgba(148, 163, 184, 0.25);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    z-index: 1100;
}

.dropdown-menu li a {
    display: block;
    padding: 8px 6px;
    font-size: 0.88rem;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    display: block;
}

/* 移动端导航 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    nav ul {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-primary);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }
    
    nav ul.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-dropdown {
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        min-width: 0;
        width: 100%;
        margin-top: 6px;
        padding: 6px 10px;
        display: none;
    }

    .dropdown-menu li a {
        padding: 10px 6px;
        width: 100%;
    }
}

/* ============================================
   主要内容区域
   ============================================ */
main {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* ============================================
   通用内容排版（专题/文章页）
   ============================================ */
.prose {
    max-width: 900px;
    margin: 0 auto;
}

.prose h2 {
    text-align: left;
    -webkit-text-fill-color: var(--text-primary);
    background: none;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.prose h3 {
    font-size: 1.5rem;
    margin: var(--spacing-xl) 0 var(--spacing-md);
    color: var(--text-primary);
}

.prose p {
    color: var(--text-secondary);
    line-height: 1.95;
    margin: 0 0 var(--spacing-md);
}

.prose ul,
.prose ol {
    margin: 0 0 var(--spacing-lg);
    padding-left: 1.25rem;
    color: var(--text-secondary);
}

.prose li {
    margin: 0.5rem 0;
}

.pill-row {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    font-weight: 600;
    font-size: 0.95rem;
}

.section-soft {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.card-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.card {
    background: rgba(15, 23, 42, 0.88);
    border: 1px solid rgba(148, 163, 184, 0.20);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.card::after {
    content: '';
    position: absolute;
    inset: -2px;
    background:
        radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.28), transparent 55%),
        radial-gradient(circle at 80% 90%, rgba(236, 72, 153, 0.20), transparent 55%);
    opacity: 0;
    transition: var(--transition-base);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 60px -18px rgba(15, 23, 42, 0.35);
    border-color: rgba(165, 180, 252, 0.95);
}

.card:hover::after {
    opacity: 1;
}

.card .meta {
    display: inline-flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: var(--gradient-soft);
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 0.8125rem;
}

.card h3 {
    color: var(--text-white);
}

.card p {
    color: var(--text-secondary);
}

.faq {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid rgba(148, 163, 184, 0.20);
    border-radius: var(--radius-lg);
    background: rgba(15, 23, 42, 0.90);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
}

.faq-item summary {
    cursor: pointer;
    padding: var(--spacing-lg);
    font-weight: 800;
    color: var(--text-white);
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item .faq-body {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.9;
}

/* ============================================
   Hero区域
   ============================================ */
.hero {
    position: relative;
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    min-height: calc(100vh - var(--header-height));
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.20), transparent 52%),
                radial-gradient(circle at 15% 80%, rgba(236, 72, 153, 0.18), transparent 55%),
                radial-gradient(circle at 90% 65%, rgba(34, 197, 94, 0.20), transparent 55%),
                #020617;
    color: var(--text-white);
    overflow: hidden;
}

.hero .container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--spacing-2xl);
}

.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 999px;
    filter: blur(32px);
    opacity: 0.85;
}

.hero::before {
    width: 520px;
    height: 520px;
    right: -160px;
    top: 12%;
    background: conic-gradient(from 180deg at 50% 50%,
        rgba(56, 189, 248, 0.0),
        rgba(56, 189, 248, 0.35),
        rgba(129, 140, 248, 0.45),
        rgba(236, 72, 153, 0.0)
    );
}

.hero::after {
    width: 420px;
    height: 420px;
    left: -140px;
    bottom: -80px;
    background: radial-gradient(circle at 30% 30%, rgba(34, 197, 94, 0.40), transparent 60%);
}

.hero h2 {
    font-size: clamp(2.8rem, 5.4vw, 4.3rem);
    font-weight: 900;
    line-height: 1.05;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
    letter-spacing: -0.04em;
}

.hero h2 span {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    max-width: 640px;
    margin: 0 0 var(--spacing-xl);
    line-height: 1.9;
    color: var(--text-secondary);
}

.hero .cta-buttons {
    justify-content: flex-start;
}

@media (max-width: 960px) {
    .hero {
        min-height: auto;
        padding: var(--spacing-2xl) 0 var(--spacing-xl);
    }
    
    .hero .container {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-xl);
    }
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-colored);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px -5px rgba(99, 102, 241, 0.4);
}

.btn-white {
    background: rgba(15, 23, 42, 0.82);
    color: var(--text-white);
    border: 1px solid rgba(148, 163, 184, 0.28);
    box-shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.55);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 40px -5px rgba(0, 0, 0, 0.3);
    border-color: rgba(191, 219, 254, 0.55);
    box-shadow: 0 22px 60px -18px rgba(56, 189, 248, 0.25);
}

.btn-secondary {
    background: transparent;
    color: var(--text-white);
    border: 2px solid var(--text-white);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
}

/* ============================================
   章节标题
   ============================================ */
section {
    padding: var(--spacing-3xl) 0;
}

section h2 {
    text-align: center;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-2xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

/* ============================================
   特性/卡片网格
   ============================================ */
.feature-grid,
.methods-grid,
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.feature-item,
.method-item,
.testimonial-item {
    background: rgba(15, 23, 42, 0.88);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border: 1px solid rgba(148, 163, 184, 0.20);
    position: relative;
    overflow: hidden;
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
}

.feature-item::before,
.method-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-base);
}

.feature-item:hover::before,
.method-item:hover::before {
    transform: scaleX(1);
}

.feature-item:hover,
.method-item:hover,
.testimonial-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-lighter);
}

.feature-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-colored);
}

.feature-item h3,
.method-item h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--spacing-md);
}

.feature-item p,
.method-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

/* ============================================
   特性部分
   ============================================ */
.features {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

/* ============================================
   方法预览部分
   ============================================ */
.methods-preview {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition-base);
    margin-top: var(--spacing-sm);
}

.read-more:hover {
    color: var(--primary-dark);
    gap: var(--spacing-sm);
}

/* ============================================
   用户反馈部分
   ============================================ */
.testimonials {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.testimonial-item {
    padding: var(--spacing-xl);
}

.testimonial-item p {
    font-style: italic;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-left: var(--spacing-lg);
}

.testimonial-item p::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -10px;
    font-size: 4rem;
    color: var(--primary-lighter);
    line-height: 1;
    opacity: 0.3;
}

.testimonial-author {
    display: flex;
    align-items: center;
    margin-top: var(--spacing-md);
}

.testimonial-author span {
    font-weight: 600;
    color: var(--primary-color);
}

/* ============================================
   CTA部分
   ============================================ */
.cta {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-hero);
    text-align: center;
    color: var(--text-white);
    position: relative;
    overflow: hidden;
    margin-top: var(--spacing-3xl);
}

.cta::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

.cta::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 15s ease-in-out infinite reverse;
}

.cta .container {
    position: relative;
    z-index: 2;
}

.cta h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
    -webkit-text-fill-color: var(--text-white);
}

.cta p {
    font-size: clamp(1.05rem, 1.9vw, 1.3rem);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   页脚
   ============================================ */
footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-col h3 {
    color: var(--text-white);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-col h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
}

.footer-col p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

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

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

.footer-col ul li a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-base);
    display: inline-block;
}

.footer-col ul li a:hover {
    color: var(--text-white);
    transform: translateX(4px);
}

.copyright {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ============================================
   页面头部（用于其他页面）
   ============================================ */
.page-header {
    background: var(--gradient-hero);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    opacity: 0.6;
}

.page-header h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
    -webkit-text-fill-color: var(--text-white);
}

.page-header p {
    font-size: clamp(1.05rem, 1.9vw, 1.2rem);
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.95;
}

/* ============================================
   方法页面样式
   ============================================ */
.methods-intro,
.tools-intro,
.cases-intro {
    padding: var(--spacing-2xl) 0;
}

.intro-card {
    background: var(--bg-card);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.intro-card h2 {
    text-align: left;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    -webkit-text-fill-color: var(--text-primary);
}

.intro-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    padding-left: 0;
    margin: var(--spacing-lg) 0;
}

.feature-list li {
    padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-xl);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.8;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.25rem;
}

.method-section {
    padding: var(--spacing-2xl) 0;
}

.method-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.method-header {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: var(--spacing-xl);
}

.method-header h2 {
    color: var(--text-white);
    -webkit-text-fill-color: var(--text-white);
    text-align: left;
    margin-bottom: 0;
    font-size: 2rem;
}

.method-content {
    padding: var(--spacing-xl);
}

.method-content h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.technique-list {
    list-style: none;
    margin: var(--spacing-lg) 0;
}

.technique-list li {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    line-height: 1.8;
    color: var(--text-secondary);
}

.technique-badge {
    display: inline-block;
    background: var(--gradient-soft);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    margin-right: var(--spacing-sm);
}

.example-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.example-before,
.example-after {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.example-header h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.example-before .example-header {
    color: var(--text-secondary);
}

.example-after .example-header {
    color: var(--secondary-color);
}

.example-before p,
.example-after p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   工具页面样式
   ============================================ */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border: 1px solid rgba(226, 232, 240, 0.8);
    display: flex;
        flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-lighter);
}

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

.tool-content h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.tool-features {
    list-style: none;
    margin: var(--spacing-md) 0;
    flex-grow: 1;
}

.tool-features li {
    padding-left: var(--spacing-lg);
    position: relative;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.tool-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ============================================
   案例页面样式
   ============================================ */
.case-study {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(226, 232, 240, 0.8);
    transition: var(--transition-base);
}

.case-study:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-lighter);
}

.case-header {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: var(--spacing-xl);
}

.case-header h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-white);
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
}

.case-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    opacity: 0.9;
}

.case-content {
    padding: var(--spacing-xl);
}

.case-content h4 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.before-content,
.after-content {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.before-content {
    border-left: 4px solid #ef4444;
}

.after-content {
    border-left: 4px solid var(--secondary-color);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.result-item {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.result-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.result-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.case-quote {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.8;
}

.quote-author {
    margin-top: var(--spacing-md);
    font-style: normal;
    font-weight: 600;
    color: var(--primary-color);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .feature-grid,
    .methods-grid,
    .testimonial-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
    
    .feature-grid,
    .methods-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .example-box,
    .comparison-box {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .cta-buttons .btn {
        width: 100%;
}

.footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .method-content,
    .intro-card {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .logo-icon {
        width: 36px;
    }
    
    .logo-text h1,
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .logo-text p,
    .logo p {
        font-size: 0.75rem;
    }
    
    nav ul {
        gap: var(--spacing-md);
    }
    
    .feature-item,
    .method-item,
    .testimonial-item {
        padding: var(--spacing-lg);
    }
}

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

section {
    animation: fadeIn 0.6s ease-out forwards;
}

/* ============================================
   滚动条样式
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }