@charset "utf-8";
/* ============================================
   战略先锋 - 企业网站样式表
   Strategic Consulting Template
   ============================================ */

/* ============================================
   一、CSS变量定义（设计系统）
   ============================================ */
:root {
    /* 主色调 */
    --color-primary: #475569;
    --color-primary-light: #64748b;
    --color-primary-dark: #1e293b;

    /* 背景色 */
    --color-bg: #f8fafc;
    --color-bg-alt: #e2e8f0;
    --color-bg-dark: #1e293b;

    /* 文字颜色 */
    --color-text: #1a202c;
    --color-text-light: #64748b;
    --color-text-lighter: #94a3b8;

    /* 功能色 */
    --color-accent: #10b981;
    --color-warning: #ef4444;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 25px;
    --radius-full: 50px;

    /* 阴影 */
    --shadow-sm: 0 4px 15px rgba(71, 85, 105, 0.3);
    --shadow-md: 0 8px 25px rgba(71, 85, 105, 0.2);
    --shadow-lg: 0 20px 40px rgba(71, 85, 105, 0.15);

    /* 过渡 */
    --transition-fast: 0.3s ease;
    --transition-normal: 0.4s ease;
    --transition-slow: 0.5s ease;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', sans-serif;
}

/* ============================================
   二、基础重置与全局样式
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text);
    overflow-x: hidden;
    background: var(--color-bg);
}

/* ============================================
   三、导航栏样式
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: #FFFFFF;
    padding: 1.5rem 5%;
    z-index: 1000;
    transition: all var(--transition-fast);
    border-bottom: 1px solid rgba(71, 85, 105, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    transition: width var(--transition-fast);
}

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

.nav-links a.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* 移动端菜单按钮 */
.mobile-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu span {
    width: 28px;
    height: 3px;
    background: var(--color-primary);
    margin: 4px 0;
    transition: var(--transition-fast);
    border-radius: 2px;
}

/* ============================================
   四、通用区域样式
   ============================================ */
.section {
    padding: 8rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 4rem;
    color: var(--color-primary-dark);
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
    letter-spacing: -1px;
}

.section-title.animate {
    opacity: 1;
    transform: translateY(0);
}

/* 淡入动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease;
}

.fade-in.animate {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   五、首屏/英雄区域
   ============================================ */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

/* 网格背景动画 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 60px 60px;
    background-position: 0 0, 0 0;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.hero-content {
    max-width: 900px;
    padding: 0 2rem;
    margin-top: 8rem;
    transform: translateY(50px);
    opacity: 0;
    animation: fadeInUp 1.2s ease forwards;
    z-index: 2;
    position: relative;
}

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

.hero h1 {
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 800;
    margin-bottom: 2rem;
    line-height: 1.1;
    letter-spacing: -2px;
}

.hero p {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    margin-bottom: 3rem;
    opacity: 0.95;
    font-weight: 300;
}

/* 首屏文字轮换效果 */
.hero-content h1,
.hero-content p {
    transition: opacity 0.5s ease-in-out;
}

.text-fade-out {
    opacity: 0;
}

/* 行动按钮 */
.cta-button {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-primary-dark);
    text-decoration: none;
    font-weight: 700;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta-button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 1);
}

/* 几何装饰图形 */
.geometric-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.geo-shape {
    position: absolute;
    opacity: 0.15;
}

.geo-shape:nth-child(1) {
    top: 20%;
    left: 15%;
    width: 120px;
    height: 120px;
    background: linear-gradient(45deg, #fff, transparent);
    clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
    animation: float 12s ease-in-out infinite;
}

.geo-shape:nth-child(2) {
    top: 15%;
    right: 20%;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #fff, transparent);
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
    animation: float 10s ease-in-out infinite reverse;
}

.geo-shape:nth-child(3) {
    top: 60%;
    left: 10%;
    width: 80px;
    height: 80px;
    background: linear-gradient(90deg, #fff, transparent);
    clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
    animation: float 8s ease-in-out infinite;
}

.geo-shape:nth-child(4) {
    top: 70%;
    right: 15%;
    width: 90px;
    height: 90px;
    background: linear-gradient(180deg, #fff, transparent);
    clip-path: polygon(50% 0%, 90% 20%, 100% 60%, 75% 100%, 25% 100%, 0% 60%, 10% 20%);
    animation: float 14s ease-in-out infinite;
}

.geo-shape:nth-child(5) {
    top: 35%;
    left: 50%;
    transform: translateX(-50%);
    width: 110px;
    height: 110px;
    background: linear-gradient(270deg, #fff, transparent);
    clip-path: polygon(50% 0%, 83% 12%, 100% 43%, 94% 78%, 68% 100%, 32% 100%, 6% 78%, 0% 43%, 17% 12%);
    animation: float 9s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(180deg); }
}

/* ============================================
   六、服务区域
   ============================================ */
.services {
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 50%, var(--color-bg) 100%);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="diagonals" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M0,20 L20,0" stroke="rgba(71,85,105,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23diagonals)"/></svg>');
}

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

.services-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 4rem;
    margin-top: 4rem;
    align-items: start;
}

.services-content {
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    backdrop-filter: blur(15px);
    border: 2px solid rgba(71, 85, 105, 0.1);
    min-height: 400px;
    transition: all var(--transition-slow);
}

.service-details {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-slow);
    display: none;
}

.service-details.active {
    opacity: 1;
    transform: translateY(0);
    display: block;
}

.service-details h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--color-primary-dark);
}

.service-details .service-subtitle {
    font-size: 1rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.service-details p {
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
    padding: 0;
    margin-top: 1.5rem;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid rgba(71, 85, 105, 0.08);
}

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

.feature-check {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.7rem;
    flex-shrink: 0;
}

/* 服务标签页 */
.services-tabs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.service-tab {
    background: rgba(255, 255, 255, 0.7);
    border: 2px solid rgba(71, 85, 105, 0.1);
    border-radius: 18px;
    padding: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.service-tab:hover,
.service-tab.active {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(71, 85, 105, 0.3);
    transform: translateX(10px);
    box-shadow: 0 10px 30px rgba(71, 85, 105, 0.15);
}

.service-tab.active {
    background: rgba(71, 85, 105, 0.1);
    border-color: rgba(71, 85, 105, 0.4);
}

.service-tab::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    transition: width var(--transition-fast);
}

.service-tab.active::before {
    width: 4px;
}

.tab-icon {
    font-size: 2rem;
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(71, 85, 105, 0.1), rgba(100, 116, 139, 0.1));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.tab-content {
    flex: 1;
    min-width: 0;
}

.service-tab h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 0.3rem;
    position: relative;
    z-index: 2;
}

.service-tab p {
    color: var(--color-text-light);
    font-size: 0.8rem;
    line-height: 1.3;
    position: relative;
    z-index: 2;
}

.service-tab:hover .tab-icon,
.service-tab.active .tab-icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    transform: scale(1.05);
}

/* ============================================
   七、关于区域
   ============================================ */
.about-section {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

/* 斜线网格背景 */
.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    background-image:
        repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.06) 1px, transparent 1px, transparent 100px),
        repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.06) 1px, transparent 1px, transparent 100px);
}

.about {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.about-content {
    position: relative;
}

.about-content::before {
    content: '';
    position: absolute;
    left: -2rem;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--color-primary-light), transparent);
    border-radius: 2px;
}

.about-content h2 {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    font-weight: 800;
    margin-bottom: 2.5rem;
    color: white;
    letter-spacing: -1px;
    line-height: 1.2;
}

.about-content .highlight {
    color: var(--color-text-lighter);
    font-weight: 600;
    font-size: 1.3rem;
    margin-bottom: 2rem;
    letter-spacing: 0.5px;
}

.about-content p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    font-size: 1.15rem;
    line-height: 1.8;
}

.about-content a {
    color: var(--color-text-lighter);
    text-decoration: none;
    font-weight: 600;
    background: linear-gradient(135deg, var(--color-text-lighter), #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    transition: all var(--transition-fast);
}

.about-content a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: linear-gradient(135deg, var(--color-text-lighter), #cbd5e1);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-fast);
}

.about-content a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.about-content a:hover {
    opacity: 0.8;
}

/* 特色功能网格 */
.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-fast);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(5px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-text-lighter));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.feature-text {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    font-size: 0.95rem;
}

/* 统计数据 */
.stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 0;
}

.stat:first-child {
    grid-column: 1 / -1;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all var(--transition-fast);
}

.stat:hover {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.15);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-text-lighter);
    display: block;
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 0.5rem;
}

/* 关于页面视觉区域 */
.about-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.about-image {
    position: relative;
    height: 350px;
    max-width: 450px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 30px;
    backdrop-filter: blur(15px);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 30px;
    opacity: 0.7;
}

.about-image::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, rgba(100, 116, 139, 0.3), transparent);
    animation: rotate 25s linear infinite;
    z-index: 1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.visual-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 3;
}

.visual-shape {
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    border-radius: 50%;
    animation: floatSlow 15s ease-in-out infinite;
}

.visual-shape:nth-child(1) {
    width: 140px;
    height: 140px;
    top: 20%;
    left: 20%;
    animation-delay: -2s;
}

.visual-shape:nth-child(2) {
    width: 80px;
    height: 80px;
    top: 60%;
    right: 30%;
    animation-delay: -5s;
}

.visual-shape:nth-child(3) {
    width: 160px;
    height: 160px;
    bottom: 25%;
    left: 30%;
    animation-delay: -8s;
}

@keyframes floatSlow {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.1; }
    50% { transform: translateY(-20px) rotate(180deg); opacity: 0.2; }
}

/* ============================================
   八、团队区域
   ============================================ */
.team {
    background: var(--color-bg);
    position: relative;
}

.team-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 3rem;
    margin-top: 4rem;
}

.team-member {
    width: 300px;
    position: relative;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.6s ease;
}

.team-member.animate {
    opacity: 1;
    transform: translateY(0);
}

.member-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7));
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(139, 69, 19, 0.1);
    transition: all var(--transition-slow);
}

.member-card:hover {
    transform: translateY(-10px) rotate(-2deg);
    border-color: rgba(71, 85, 105, 0.3);
    box-shadow: var(--shadow-lg);
}

.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(100, 116, 139, 0.1), transparent);
    transition: left var(--transition-slow);
}

.member-card:hover::before {
    left: 100%;
}

.member-avatar {
    width: 144px;
    height: 144px;
    background: linear-gradient(135deg, var(--color-bg-dark), var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.5rem;
    color: white;
    position: relative;
    z-index: 2;
    overflow: hidden;
}

.member-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.member-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-primary-dark);
    position: relative;
    z-index: 2;
}

.member-role {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.member-info p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
    z-index: 2;
}

/* ============================================
   九、客户评价区域（已注释）
   ============================================ */
.testimonials {
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
    position: relative;
    overflow: hidden;
}

.testimonials-container {
    position: relative;
    margin-top: 3rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.testimonial {
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.testimonial.animate {
    opacity: 1;
    transform: translateY(0);
}

.testimonial-content {
    background: rgba(255, 255, 255, 0.8);
    padding: 2rem;
    border-radius: var(--radius-lg);
    position: relative;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(71, 85, 105, 0.1);
    box-shadow: 0 8px 25px rgba(71, 85, 105, 0.1);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-content::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: 20px;
    font-size: 4rem;
    color: rgba(71, 85, 105, 0.15);
    font-family: Georgia, serif;
    line-height: 1;
}

.testimonial-text {
    color: var(--color-primary-dark);
    font-style: italic;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
    position: relative;
    z-index: 2;
    flex-grow: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
    z-index: 2;
    margin-top: auto;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.author-info h4 {
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 0.2rem;
    font-size: 0.95rem;
}

.author-info span {
    color: var(--color-primary);
    font-size: 0.85rem;
}

/* ============================================
   十、联系区域
   ============================================ */
.contact {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 80px 80px;
    background-position: 0 0, 0 0;
    animation: contactGridMove 30s linear infinite;
}

@keyframes contactGridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(80px, 80px); }
}

.contact .section-title {
    color: white;
}

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.contact p {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    text-align: center;
}

.contact-form {
    display: grid;
    gap: 2rem;
    margin-top: 4rem;
}

.form-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-family);
    font-weight: 400;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transition: all var(--transition-fast);
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 4px rgba(100, 116, 139, 0.2);
    transform: scale(1.02);
}

.contact-form textarea {
    grid-column: 1 / -1;
    resize: vertical;
    min-height: 150px;
    font-family: inherit;
}

.submit-btn {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: white;
    padding: 1.5rem 3rem;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    justify-self: center;
    position: relative;
    overflow: hidden;
}

.submit-btn::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 var(--transition-slow);
}

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

.submit-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 30px rgba(100, 116, 139, 0.4);
}

/* ============================================
   十一、页脚
   ============================================ */
.footer {
    background: #0f172a;
    color: white;
    padding: 3rem 5% 2rem;
    text-align: center;
    border-top: 1px solid rgba(71, 85, 105, 0.2);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-weight: 400;
    transition: color var(--transition-fast);
}

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

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-design {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
}

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

.footer-design a:hover {
    color: var(--color-primary-light);
}

/* ============================================
   十二、回到顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.back-to-top span {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
}

/* ============================================
   十三、动画关键帧
   ============================================ */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

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

/* ============================================
   十四、响应式媒体查询
   ============================================ */

/* 平板端（最大1000px） */
@media (max-width: 1000px) {
    .about {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
}

/* 小屏幕导航（最大940px） */
@media (max-width: 940px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(248, 250, 252, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem 5%;
        box-shadow: 0 10px 30px rgba(71, 85, 105, 0.1);
        border-radius: 0 0 20px 20px;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu {
        display: flex;
    }

    .about {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 4rem;
    }

    .about-content::before {
        display: none;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .form-group {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 5rem 5%;
    }

    .services-tabs {
        flex-direction: column;
        gap: 1rem;
    }

    .service-tab {
        width: 100%;
        flex-shrink: 0;
        flex-direction: column;
        text-align: center;
        gap: 0.8rem;
    }

    .tab-content {
        text-align: center;
    }

    .services-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .services-tabs {
        order: -1;
    }

    .service-tab:hover,
    .service-tab.active {
        transform: translateY(-2px);
    }

    .team-grid {
        flex-direction: column;
        align-items: center;
    }

    .testimonials-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .testimonial-content {
        padding: 1.5rem;
    }

    .testimonial,
    .testimonial:nth-child(even) {
        transform: translateY(30px);
        margin: 0;
    }

    .testimonial.animate,
    .testimonial:nth-child(even).animate {
        transform: translateY(0);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

/* 手机端（最大480px） */
@media (max-width: 480px) {
    .stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat:first-child {
        grid-column: 1;
    }

    .service-item {
        padding: 2rem;
    }

    .member-card {
        padding: 2rem;
    }
}

/* ============================================
   提示消息样式
   ============================================ */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.alert-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #059669;
}

.alert-error {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.1));
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #dc2626;
}

.error-msg {
    color: #dc2626;
    font-size: 0.85rem;
    margin-top: 0.25rem;
    display: block;
}