/* ============================================
   GEO 智能优化引擎 - 用户导向展示网站 v3.2
   面向普通用户 | 浅色系 | 科技感 | 全屏
   ============================================ */

/* === CSS 变量 === */
:root {
    --primary: #0066ff;
    --primary-light: #3385ff;
    --primary-dark: #0052cc;
    --accent: #00d4aa;
    --accent-light: #33e0be;
    --secondary: #7c3aed;
    --warning: #f59e0b;
    --error: #ef4444;
    --dark: #0a1628;
    --dark-lighter: #1a2744;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --gray-lighter: #cbd5e1;
    --gray-lightest: #e2e8f0;
    --light: #f8fafc;
    --white: #ffffff;
    --bg: #f0f4f8;
    --card-bg: rgba(255,255,255,0.95);
    --glass: rgba(255,255,255,0.8);
    --border: rgba(0,102,255,0.08);
    --gradient-primary: linear-gradient(135deg, #0066ff 0%, #00d4aa 100%);
    --gradient-secondary: linear-gradient(135deg, #7c3aed 0%, #0066ff 100%);
    --gradient-accent: linear-gradient(135deg, #00d4aa 0%, #0066ff 100%);
    --gradient-light: linear-gradient(180deg, #f0f4f8 0%, #ffffff 100%);
    --shadow-sm: 0 2px 8px rgba(0,102,255,0.05);
    --shadow-md: 0 8px 32px rgba(0,102,255,0.08);
    --shadow-lg: 0 16px 48px rgba(0,102,255,0.12);
    --shadow-xl: 0 24px 64px rgba(0,102,255,0.15);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* === 重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--dark);
    background: var(--bg);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* 选中文本颜色 */
::selection {
    background: rgba(0,102,255,0.15);
    color: var(--primary-dark);
}
::-moz-selection {
    background: rgba(0,102,255,0.15);
    color: var(--primary-dark);
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--light); }
::-webkit-scrollbar-thumb { background: var(--gray-lighter); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-light); }

/* === 页面加载动画 === */
.page-loader {
    position: fixed; inset: 0; z-index: 9999;
    background: var(--white);
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}
.page-loader.hidden { opacity: 0; visibility: hidden; }
.loader-content {
    display: flex; flex-direction: column; align-items: center; gap: 24px;
}
.loader-spinner {
    width: 56px; height: 56px;
    border: 3px solid var(--gray-lightest);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.loader-text {
    font-size: 15px; color: var(--gray); font-weight: 500;
    letter-spacing: 2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* === 通用容器 === */
.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }

/* === 导航栏 === */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: rgba(255,255,255,0);
    transform: translateY(0);
}
.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    box-shadow: 0 1px 30px rgba(0,102,255,0.06);
    padding: 14px 0;
}
.navbar.hidden {
    transform: translateY(-100%);
}
.navbar .container {
    display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { 
    display: flex; align-items: center; gap: 12px; 
    cursor: pointer;
    transition: var(--transition);
}
.nav-brand:hover {
    transform: scale(1.02);
}
.nav-brand:hover .logo-icon {
    transform: rotate(15deg) scale(1.1);
}
.logo-icon {
    width: 44px; height: 44px; border-radius: 12px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    color: var(--white); font-size: 20px;
    box-shadow: 0 4px 16px rgba(0,102,255,0.3);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.logo-text { font-size: 26px; font-weight: 800; color: var(--dark); letter-spacing: -1px; }

.nav-menu { display: flex; align-items: center; gap: 40px; }
.nav-menu a {
    font-size: 15px; color: var(--dark); font-weight: 500;
    transition: var(--transition); position: relative;
}
.nav-menu a:not(.btn-primary-small):hover { color: var(--primary); }
.nav-menu a:not(.btn-primary-small)::after {
    content: ''; position: absolute; bottom: -6px; left: 50%; width: 0; height: 2px;
    background: var(--gradient-primary); transition: var(--transition); border-radius: 1px;
    transform: translateX(-50%);
}
.nav-menu a:not(.btn-primary-small):hover::after { width: 100%; }
.nav-menu a:not(.btn-primary-small):active {
    transform: scale(0.96);
}

.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--dark); transition: var(--transition); border-radius: 1px; }

/* === 按钮 === */
.btn-primary-small {
    background: var(--gradient-primary); color: var(--white) !important;
    padding: 10px 28px; border-radius: 50px; font-weight: 600;
    transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
    box-shadow: 0 4px 16px rgba(0,102,255,0.25);
    position: relative; overflow: hidden;
}
.btn-primary-small::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 ease;
}
.btn-primary-small:hover::before { left: 100%; }
.btn-primary-small:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,102,255,0.35); }
.btn-primary-small:active { transform: translateY(0) scale(0.97); }
.btn-primary-small::after { display: none !important; }

.btn-primary, .btn-outline {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 18px 40px; border-radius: 50px; font-size: 16px; font-weight: 600;
    transition: var(--transition); cursor: pointer; border: none;
    position: relative; overflow: hidden;
}
.btn-primary {
    background: var(--gradient-primary); color: var(--white);
    box-shadow: 0 6px 24px rgba(0,102,255,0.3);
}
.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 ease;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover {
    transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,102,255,0.4);
}
.btn-primary:active { transform: translateY(-1px) scale(0.97); }
.btn-outline {
    background: rgba(255,255,255,0.9); color: var(--primary);
    border: 2px solid rgba(0,102,255,0.15);
    backdrop-filter: blur(10px);
}
.btn-outline:hover {
    background: var(--white); border-color: var(--primary);
    transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,102,255,0.15);
}
.btn-outline:active { transform: translateY(-1px) scale(0.97); }
.btn-large { padding: 20px 48px; font-size: 17px; }

/* === 通用文字 === */
.gradient-text {
    background: var(--gradient-primary); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}

/* === Hero 全屏区域 === */
.hero {
    position: relative; min-height: 100vh;
    display: flex; align-items: center;
    background: var(--gradient-light);
    overflow: hidden;
    padding: 140px 0 100px;
}
.hero-bg {
    position: absolute; inset: 0; z-index: 0;
    background: 
        radial-gradient(ellipse at 20% 30%, rgba(0,102,255,0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(0,212,170,0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(124,58,237,0.02) 0%, transparent 60%);
}
.hero-grid {
    position: absolute; inset: 0;
    background-image: 
        linear-gradient(rgba(0,102,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,102,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}
.hero-orb {
    position: absolute; border-radius: 50%; filter: blur(80px);
    animation: orbFloat 10s ease-in-out infinite;
}
.hero-orb-1 { width: 400px; height: 400px; background: rgba(0,102,255,0.08); top: 10%; right: 15%; animation-delay: 0s; }
.hero-orb-2 { width: 300px; height: 300px; background: rgba(0,212,170,0.08); bottom: 20%; left: 10%; animation-delay: -5s; }
.hero-orb-3 { width: 250px; height: 250px; background: rgba(124,58,237,0.06); top: 50%; right: 30%; animation-delay: -3s; }
@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 10px;
    background: rgba(0,102,255,0.06); border: 1px solid rgba(0,102,255,0.12);
    padding: 10px 24px; border-radius: 50px; font-size: 14px;
    color: var(--primary); margin-bottom: 32px; font-weight: 500;
    backdrop-filter: blur(10px);
}
.hero-badge i { color: var(--accent); }
.hero-title {
    font-size: clamp(42px, 5.5vw, 64px); font-weight: 800; line-height: 1.15;
    color: var(--dark); margin-bottom: 28px; letter-spacing: -0.03em;
}
.hero-desc {
    font-size: 18px; line-height: 1.8; color: var(--gray);
    margin-bottom: 40px; max-width: 520px;
}
.hero-stats { display: flex; align-items: center; gap: 24px; margin-bottom: 48px; }
.stat-item { text-align: center; }
.stat-number { font-size: 32px; font-weight: 800; color: var(--dark); margin-bottom: 6px; }
.stat-label { font-size: 13px; color: var(--gray); font-weight: 500; }
.stat-divider { width: 1px; height: 50px; background: var(--gray-lightest); }
.hero-actions { display: flex; gap: 20px; flex-wrap: wrap; }

/* AI Chat Preview */
.hero-visual { position: relative; }
.ai-chat-preview {
    background: var(--white); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl); border: 1px solid var(--border);
    overflow: hidden; max-width: 420px; margin: 0 auto;
}
.chat-header {
    display: flex; align-items: center; gap: 12px;
    padding: 16px 20px; background: var(--gradient-primary);
    color: var(--white);
}
.chat-avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
}
.chat-info { display: flex; flex-direction: column; }
.chat-name { font-weight: 600; font-size: 15px; }
.chat-status { font-size: 12px; opacity: 0.8; }
.chat-body { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
.chat-message { padding: 14px 18px; border-radius: 18px; font-size: 14px; line-height: 1.6; }
.chat-message.user {
    background: var(--light); color: var(--dark); align-self: flex-start;
    border-bottom-left-radius: 4px;
}
.chat-message.ai {
    background: var(--gradient-primary); color: var(--white); align-self: flex-end;
    border-bottom-right-radius: 4px;
}
.chat-message.ai strong { font-weight: 700; }
.chat-message.ai ul { margin: 10px 0; padding-left: 18px; }
.chat-message.ai li { margin: 6px 0; }
.chat-cta { margin-top: 10px; font-size: 13px; opacity: 0.95; }

.float-card {
    position: absolute; padding: 16px 20px;
    display: flex; align-items: center; gap: 14px;
    animation: floatCard 4s ease-in-out infinite;
    background: var(--white); border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg); border: 1px solid var(--border);
}
.float-card-1 { top: 5%; right: -40px; animation-delay: 0s; }
.float-card-2 { bottom: 15%; right: -30px; animation-delay: 2s; }
@keyframes floatCard { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.float-card i {
    width: 44px; height: 44px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: var(--white);
}
.float-card-1 i { background: linear-gradient(135deg, #00d4aa, #33e0be); }
.float-card-2 i { background: var(--gradient-primary); }
.float-card div { display: flex; flex-direction: column; }
.float-card span { font-size: 12px; color: var(--gray); font-weight: 500; }
.float-card strong { font-size: 20px; font-weight: 800; color: var(--dark); }

/* === 信任背书 === */
.trust-section { padding: 60px 0; background: var(--white); border-bottom: 1px solid var(--border); }
.trust-title { text-align: center; font-size: 18px; color: var(--gray); margin-bottom: 40px; }
.trust-title strong { color: var(--primary); font-size: 28px; }
.trust-logos {
    display: flex; justify-content: center; gap: 32px; flex-wrap: wrap;
}
.trust-logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 15px; color: var(--gray); font-weight: 500;
    transition: var(--transition);
    padding: 12px 20px; border-radius: 12px;
    background: var(--light); border: 1px solid var(--gray-lightest);
}
.trust-logo:hover {
    background: var(--white);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0,102,255,0.1);
}
.trust-logo i { font-size: 18px; color: var(--primary); transition: var(--transition); }
.trust-logo:hover i { transform: scale(1.15); }

/* === 通用 Section === */
.section { padding: 120px 0; }
.section-alt { background: var(--white); }
.section-gradient { background: linear-gradient(180deg, #f0f4f8 0%, #ffffff 50%, #f0f4f8 100%); }
.section-header { text-align: center; margin-bottom: 72px; max-width: 640px; margin-left: auto; margin-right: auto; }
.section-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(0,102,255,0.06); color: var(--primary);
    padding: 10px 24px; border-radius: 50px; font-size: 14px;
    font-weight: 600; margin-bottom: 24px; letter-spacing: 0.5px;
}
.section-title { font-size: clamp(32px, 4.5vw, 44px); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 20px; line-height: 1.2; color: var(--dark); }
.section-desc { font-size: 18px; color: var(--gray); line-height: 1.8; }

/* === 三步流程 === */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.step-card {
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 48px 36px;
    transition: var(--transition); position: relative; overflow: hidden;
    box-shadow: var(--shadow-sm); text-align: center;
}
.step-card:hover {
    transform: translateY(-12px); box-shadow: var(--shadow-lg);
    border-color: rgba(0,102,255,0.15);
}
.step-card:hover .step-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 16px 40px rgba(0,102,255,0.35);
}
.step-card:hover .step-number {
    color: rgba(0,102,255,0.08);
    transform: scale(1.1);
}
.step-number {
    position: absolute; top: 20px; right: 24px;
    font-size: 72px; font-weight: 900; color: rgba(0,102,255,0.04);
    line-height: 1; transition: var(--transition);
}
.step-icon {
    width: 72px; height: 72px; border-radius: 20px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; color: var(--white); margin: 0 auto 28px;
    box-shadow: 0 12px 32px rgba(0,102,255,0.25);
    transition: var(--transition-bounce);
}
.step-card h3 { font-size: 22px; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
.step-card > p { font-size: 15px; color: var(--gray); line-height: 1.8; margin-bottom: 24px; }
.step-features { text-align: left; }
.step-features li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--dark-lighter); margin: 10px 0; transition: var(--transition); }
.step-card:hover .step-features li { transform: translateX(4px); }
.step-features li::before { content: '✓'; color: var(--accent); font-weight: 700; }

/* === 核心优势 === */
.benefits-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.benefit-card {
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 40px;
    transition: var(--transition); position: relative;
    box-shadow: var(--shadow-sm); overflow: hidden;
}
.benefit-card::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
    background: var(--gradient-primary); transform: scaleX(0);
    transition: transform 0.4s ease; transform-origin: center;
}
.benefit-card:hover {
    transform: translateY(-8px); box-shadow: var(--shadow-lg);
    border-color: rgba(0,102,255,0.15);
}
.benefit-card:hover::after { transform: scaleX(1); }
.benefit-card:hover .benefit-icon {
    transform: scale(1.1) rotate(-5deg);
    box-shadow: 0 12px 32px rgba(0,102,255,0.3);
}
.benefit-icon {
    width: 60px; height: 60px; border-radius: 16px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: var(--white); margin-bottom: 24px;
    box-shadow: 0 8px 24px rgba(0,102,255,0.2);
    transition: var(--transition-bounce);
}
.benefit-card h3 { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 12px; }
.benefit-card > p { font-size: 15px; color: var(--gray); line-height: 1.8; margin-bottom: 24px; }
.benefit-stat { display: flex; align-items: center; gap: 12px; padding-top: 20px; border-top: 1px solid var(--gray-lightest); }
.benefit-stat .stat-value { font-size: 28px; font-weight: 800; color: var(--primary); transition: var(--transition); }
.benefit-card:hover .stat-value { transform: scale(1.1); }
.benefit-stat .stat-label { font-size: 14px; color: var(--gray); }

/* === 成功案例 === */
.cases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.case-card {
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 36px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative; overflow: hidden;
}
.case-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: var(--gradient-primary); transform: scaleX(0);
    transition: transform 0.4s ease; transform-origin: left;
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: rgba(0,102,255,0.15); }
.case-card:hover::before { transform: scaleX(1); }
.case-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.case-icon {
    width: 56px; height: 56px; border-radius: 16px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: var(--white);
    transition: var(--transition-bounce);
}
.case-card:hover .case-icon { transform: scale(1.1) rotate(-5deg); }
.case-info h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.case-info span { font-size: 13px; color: var(--gray); }
.case-stats { display: flex; gap: 24px; margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--gray-lightest); }
.case-stat { text-align: center; }
.case-value { display: block; font-size: 20px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.case-label { font-size: 12px; color: var(--gray); }
.case-desc { font-size: 14px; color: var(--gray); line-height: 1.8; margin-bottom: 20px; font-style: italic; }
.case-tag { display: inline-block; background: rgba(0,212,170,0.1); color: var(--accent); padding: 6px 16px; border-radius: 50px; font-size: 13px; font-weight: 600; transition: var(--transition); }
.case-card:hover .case-tag { background: var(--accent); color: var(--white); }

/* === 服务流程时间线 === */
.service-timeline { max-width: 800px; margin: 0 auto; position: relative; }
.service-timeline::before {
    content: ''; position: absolute; left: 32px; top: 0; bottom: 0; width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
}
.timeline-item {
    display: flex; gap: 32px; padding: 32px 0; position: relative;
    opacity: 0; transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.timeline-item.visible { opacity: 1; transform: translateX(0); }
.timeline-icon {
    width: 64px; height: 64px; border-radius: 50%;
    background: var(--white); border: 2px solid var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: var(--primary); flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(0,102,255,0.15);
    transition: var(--transition-bounce);
}
.timeline-item:hover .timeline-icon {
    transform: scale(1.15);
    background: var(--gradient-primary);
    color: var(--white); border-color: transparent;
}
.timeline-content { padding-top: 8px; }
.timeline-content h3 { font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.timeline-content p { font-size: 15px; color: var(--gray); line-height: 1.8; }

/* === FAQ === */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.faq-item {
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 28px;
    transition: var(--transition);
    position: relative; overflow: hidden;
}
.faq-item::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
    background: var(--gradient-primary); transform: scaleY(0);
    transition: transform 0.3s ease; transform-origin: top;
}
.faq-item:hover {
    border-color: rgba(0,102,255,0.15);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}
.faq-item:hover::before { transform: scaleY(1); }
.faq-item h3 {
    display: flex; align-items: center; gap: 12px;
    font-size: 17px; font-weight: 700; color: var(--dark);
    margin-bottom: 16px; transition: color 0.3s ease;
}
.faq-item:hover h3 { color: var(--primary); }
.faq-item h3 i {
    color: var(--primary); font-size: 20px;
    transition: var(--transition-bounce);
}
.faq-item:hover h3 i { transform: scale(1.15) rotate(5deg); }
.faq-item p { font-size: 15px; color: var(--gray); line-height: 1.8; transition: color 0.3s ease; }
.faq-item:hover p { color: var(--dark-lighter); }

/* === CTA Section === */
.cta-section { background: var(--gradient-primary); padding: 100px 0; position: relative; overflow: hidden; }
.cta-section::before {
    content: ''; position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}
.cta-content { text-align: center; max-width: 680px; margin: 0 auto; position: relative; z-index: 1; }
.cta-title { font-size: clamp(32px, 4.5vw, 44px); font-weight: 800; color: var(--white); margin-bottom: 20px; line-height: 1.2; }
.cta-desc { font-size: 18px; color: rgba(255,255,255,0.9); line-height: 1.8; margin-bottom: 32px; }
.cta-features-inline { display: flex; justify-content: center; gap: 32px; margin-bottom: 40px; flex-wrap: wrap; }
.cta-features-inline span { display: flex; align-items: center; gap: 8px; font-size: 15px; color: rgba(255,255,255,0.95); }
.cta-features-inline i { color: var(--accent-light); }
.cta-actions { display: flex; justify-content: center; margin-bottom: 24px; }
.cta-actions .btn-primary { background: var(--white); color: var(--primary); box-shadow: 0 8px 32px rgba(0,0,0,0.15); }
.cta-actions .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,0.25); }
.cta-note { font-size: 14px; color: rgba(255,255,255,0.8); margin-bottom: 32px; }
.cta-note a { color: var(--white); text-decoration: underline; }

/* === 联系方式 === */
.contact-info { display: flex; justify-content: center; align-items: center; gap: 48px; margin-top: 32px; flex-wrap: wrap; }
.contact-item { display: flex; align-items: center; gap: 12px; text-align: left; background: rgba(255,255,255,0.1); padding: 12px 20px; border-radius: 12px; backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.15); transition: var(--transition); }
.contact-item:hover { background: rgba(255,255,255,0.15); transform: translateY(-2px); }
.contact-item i { width: 40px; height: 40px; border-radius: 10px; background: rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center; font-size: 18px; color: var(--white); }
.contact-item div { display: flex; flex-direction: column; }
.contact-item span { font-size: 12px; color: rgba(255,255,255,0.7); margin-bottom: 2px; }
.contact-item strong { font-size: 15px; color: var(--white); font-weight: 600; }

@media (max-width: 768px) {
    .contact-info { gap: 16px; }
    .contact-item { padding: 10px 16px; }
    .contact-item i { width: 36px; height: 36px; font-size: 16px; }
    .contact-item strong { font-size: 14px; }
}

/* === 页脚 === */
.footer { background: var(--dark); padding: 72px 0 40px; }
.footer-content { display: flex; justify-content: space-between; gap: 48px; margin-bottom: 56px; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-brand .logo-icon {
    width: 52px; height: 52px; font-size: 22px;
    transition: var(--transition-bounce);
}
.footer-brand:hover .logo-icon { transform: rotate(15deg) scale(1.1); }
.footer-logo { font-size: 22px; font-weight: 800; color: var(--white); }
.footer-brand-desc { font-size: 14px; color: rgba(255,255,255,0.5); }
.footer-links { display: flex; gap: 64px; }
.footer-link-group h4 { font-size: 15px; font-weight: 700; color: var(--white); margin-bottom: 20px; }
.footer-link-group a { display: block; font-size: 14px; color: rgba(255,255,255,0.5); margin-bottom: 12px; transition: var(--transition); }
.footer-link-group a:hover { color: var(--white); transform: translateX(4px); }
.footer-link-group a i { margin-right: 8px; transition: var(--transition); }
.footer-link-group a:hover i { color: var(--accent); }
.footer-bottom { padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; }
.footer-bottom p { font-size: 14px; color: rgba(255,255,255,0.4); }

/* === 一键回顶部按钮 === */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; z-index: 999;
    width: 50px; height: 50px; border-radius: 50%;
    background: var(--gradient-primary); color: var(--white);
    border: none; cursor: pointer; font-size: 18px;
    box-shadow: 0 4px 20px rgba(0,102,255,0.3);
    transition: var(--transition); opacity: 0; visibility: hidden;
    display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 8px 30px rgba(0,102,255,0.4);
}
.back-to-top:active { transform: translateY(-2px) scale(0.95); }

/* === 响应式设计 === */
@media (max-width: 1200px) {
    .cases-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
    .hero .container { grid-template-columns: 1fr; gap: 56px; }
    .hero-visual { max-width: 480px; margin: 0 auto; }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .benefits-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-grid { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; }
}

@media (max-width: 768px) {
    .nav-menu { 
        display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(255,255,255,0.98); backdrop-filter: blur(20px);
        flex-direction: column; justify-content: center; align-items: center; gap: 32px;
    }
    .nav-menu.active { display: flex; }
    .nav-menu a { font-size: 18px; }
    .nav-toggle { display: flex; z-index: 1001; }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    .hero { padding: 120px 0 80px; min-height: auto; }
    .hero-stats { flex-wrap: wrap; justify-content: center; }
    .hero-actions { justify-content: center; }
    .trust-logos { gap: 24px; }
    .steps-grid, .benefits-grid, .cases-grid { grid-template-columns: 1fr; }
    .service-timeline::before { left: 24px; }
    .timeline-item { gap: 20px; }
    .timeline-icon { width: 48px; height: 48px; font-size: 18px; }
    .section { padding: 80px 0; }
    .section-title { font-size: 28px; }
    .footer-links { flex-direction: column; gap: 32px; }
    .cta-features-inline { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 32px; }
    .hero-desc { font-size: 15px; }
    .btn-large { padding: 16px 32px; font-size: 15px; }
    .float-card { display: none; }
    .container { padding: 0 20px; }
    .ai-chat-preview { max-width: 100%; }
}

/* === 滚动动画 === */
.fade-up { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }