/* ============================================================
   艾尚创业集团官网 - 主样式表
   基于需求文档 V1.0 设计
   品牌色: 艾尚橙 #F26B2B / 商务蓝 #1E3A5F
   ============================================================ */

/* ----- CSS变量 ----- */
:root {
    --orange: #F26B2B;
    --orange-dark: #D9571A;
    --blue: #1E3A5F;
    --blue-light: #2A4A7F;
    --gray-bg: #E8EEF3;
    --gray-light: #F5F5F5;
    --text-dark: #2C2C2C;
    --text-mid: #666666;
    --text-light: #999999;
    --white: #FFFFFF;
    --black: #000000;
    
    --font-heading: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-en: 'Montserrat', 'Open Sans', sans-serif;
    
    --header-height: 80px;
    --header-height-mobile: 60px;
    --container-width: 1200px;
    --radius: 8px;
    --transition: 0.3s ease;
}

/* ----- Reset & Base ----- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- 按钮系统 ----- */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--orange-dark);
    border-color: var(--orange-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(242, 107, 43, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--text-dark);
}

.btn-outline-dark {
    background: transparent;
    color: var(--text-dark);
    border-color: var(--text-dark);
}

.btn-outline-dark:hover {
    background: var(--text-dark);
    color: var(--white);
}

/* ----- 板块通用 ----- */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--orange);
    margin-bottom: 12px;
    font-weight: 600;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.highlight {
    color: var(--orange);
}

.section-desc {
    font-size: 16px;
    color: var(--text-mid);
    max-width: 600px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: 50px;
}

/* ============================================================
   Header 顶部导航
   ============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all var(--transition);
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    border-bottom: 1px solid #eee;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.header-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    flex-shrink: 0;
}

.logo-img {
    height: 40px;
    width: auto;
}

/* 桌面端导航 */
.nav-desktop {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    color: var(--text-dark);
    border-radius: var(--radius);
    transition: all var(--transition);
    position: relative;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--orange);
}

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

.dropdown-arrow {
    font-size: 10px;
    margin-left: 4px;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--white);
    min-width: 200px;
    border-radius: var(--radius);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    margin-top: 8px;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    color: var(--text-dark);
    transition: all var(--transition);
}

.dropdown-menu a:hover {
    background: var(--gray-light);
    color: var(--orange);
    padding-left: 28px;
}

/* 右侧联系按钮 */
.header-contact {
    flex-shrink: 0;
}

.btn-phone {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    background: var(--orange);
    color: var(--white);
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    transition: all var(--transition);
}

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

.btn-phone svg {
    width: 14px;
    height: 14px;
}

/* 汉堡菜单按钮 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all var(--transition);
    border-radius: 2px;
}

/* 移动端导航抽屉 */
.nav-mobile {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background: var(--blue);
    z-index: 1001;
    transition: right 0.4s ease;
    overflow-y: auto;
    padding: 30px 20px;
}

.nav-mobile.active {
    right: 0;
}

.nav-mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo-img-white {
    height: 32px;
    width: auto;
    background: var(--white);
    padding: 6px 12px;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.nav-mobile-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 28px;
    cursor: pointer;
}

.nav-mobile-links {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-mobile-links a {
    display: block;
    padding: 14px 16px;
    color: rgba(255,255,255,0.8);
    font-size: 16px;
    border-radius: var(--radius);
    transition: all var(--transition);
}

.nav-mobile-links a:hover {
    background: rgba(255,255,255,0.1);
    color: var(--white);
    padding-left: 24px;
}

.nav-mobile-links a:nth-child(3),
.nav-mobile-links a:nth-child(4),
.nav-mobile-links a:nth-child(5),
.nav-mobile-links a:nth-child(6),
.nav-mobile-links a:nth-child(7) {
    padding-left: 32px;
    font-size: 14px;
}

/* ============================================================
   Hero Banner
   ============================================================ */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.5) 0%,
        rgba(0, 0, 0, 0.6) 50%,
        rgba(0, 0, 0, 0.7) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    padding: 0 20px;
    max-width: 900px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 4px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 22px;
    margin-bottom: 12px;
    opacity: 0.9;
    font-weight: 400;
}

.hero-desc {
    font-size: 16px;
    margin-bottom: 40px;
    opacity: 0.8;
    letter-spacing: 2px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    padding: 14px 40px;
    font-size: 17px;
}

/* 向下滚动提示 */
.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    color: var(--white);
    text-align: center;
    font-size: 12px;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    margin: 8px auto 0;
    border-right: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    transform: rotate(45deg);
}

/* ============================================================
   Stats Bar 数据展示条
   ============================================================ */
.stats-bar {
    background: var(--orange);
    padding: 40px 0;
    position: relative;
    z-index: 2;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
    color: var(--white);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 52px;
    font-weight: 800;
    line-height: 1;
    font-family: var(--font-en);
}

.stat-suffix {
    font-size: 24px;
    font-weight: 700;
    margin-top: -8px;
}

.stat-label {
    font-size: 15px;
    margin-top: 8px;
    opacity: 0.9;
}

/* ============================================================
   五大业务版图 Services
   ============================================================ */
.services-section {
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px 20px;
    text-align: center;
    transition: all var(--transition);
    border: 1px solid #eee;
    display: block;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    border-color: var(--orange);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--gray-light);
}

.service-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.service-name {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.service-desc {
    font-size: 13px;
    color: var(--text-mid);
    line-height: 1.6;
    margin-bottom: 16px;
}

.service-link {
    font-size: 14px;
    color: var(--orange);
    font-weight: 600;
}

/* ============================================================
   关于我们 About Preview
   ============================================================ */
.about-preview {
    background: var(--gray-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 12px;
}

.about-image-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: var(--orange);
    color: var(--white);
    padding: 12px 20px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.badge-year {
    font-size: 28px;
    font-weight: 800;
    font-family: var(--font-en);
    line-height: 1;
}

.badge-text {
    font-size: 12px;
    margin-top: 4px;
}

.about-content {
    padding: 20px 0;
}

.about-text {
    font-size: 15px;
    color: var(--text-mid);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 30px 0;
}

.about-stat {
    text-align: center;
    padding: 16px 8px;
    background: var(--white);
    border-radius: var(--radius);
}

.about-stat-num {
    display: block;
    font-size: 24px;
    font-weight: 800;
    color: var(--orange);
    font-family: var(--font-en);
}

.about-stat-label {
    font-size: 12px;
    color: var(--text-mid);
    margin-top: 4px;
}

/* ============================================================
   企业文化 Culture
   ============================================================ */
.culture-section {
    background: var(--white);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.culture-card {
    background: linear-gradient(135deg, var(--blue) 0%, var(--blue-light) 100%);
    color: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: all var(--transition);
}

.culture-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(30, 58, 95, 0.3);
}

.culture-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.culture-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
}

.culture-card p {
    font-size: 15px;
    opacity: 0.9;
    line-height: 1.6;
}

/* ============================================================
   核心团队 Team Preview
   ============================================================ */
.team-preview {
    background: var(--gray-bg);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.team-card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px 20px;
    text-align: center;
    transition: all var(--transition);
}

.team-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

.team-avatar {
    width: 180px;
    height: 220px;
    margin: 0 auto 16px;
    border-radius: 12px;
    overflow: hidden;
    border: 3px solid var(--orange);
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

.team-avatar-placeholder {
    background: var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    border-color: var(--text-light);
}

.team-avatar-placeholder span {
    font-size: 14px;
    color: var(--text-light);
}

.team-name {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 6px;
}

.team-position {
    font-size: 14px;
    color: var(--orange);
    font-weight: 600;
    margin-bottom: 12px;
}

.team-bio {
    font-size: 13px;
    color: var(--text-mid);
    line-height: 1.6;
    text-align: left;
}

/* ============================================================
   服务流程 Process
   ============================================================ */
.process-section {
    background: var(--white);
}

.process-grid {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 20px;
}

.process-step {
    flex: 1;
    text-align: center;
    padding: 30px 20px;
    background: var(--gray-light);
    border-radius: 12px;
    transition: all var(--transition);
    position: relative;
}

.process-step:hover {
    background: var(--white);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    transform: translateY(-4px);
}

.process-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 36px;
    background: var(--orange);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 800;
    font-family: var(--font-en);
}

.process-icon {
    width: 60px;
    height: 60px;
    margin: 10px auto 16px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--white);
}

.process-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.process-step h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.process-step p {
    font-size: 13px;
    color: var(--text-mid);
    line-height: 1.6;
}

.process-arrow {
    font-size: 24px;
    color: var(--orange);
    padding-top: 50px;
    flex-shrink: 0;
}

/* ============================================================
   客户案例 Clients
   ============================================================ */
.clients-section {
    background: var(--gray-bg);
}

.clients-wall {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.client-logo {
    background: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 700;
    font-size: 16px;
    color: var(--text-dark);
    transition: all var(--transition);
    border: 1px solid #eee;
}

.client-logo:hover {
    border-color: var(--orange);
    color: var(--orange);
    transform: translateY(-4px);
}

/* ============================================================
   联系我们 Contact Preview
   ============================================================ */
.contact-preview {
    background: var(--blue);
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.contact-info {
    color: var(--white);
}

.contact-details {
    margin-top: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    font-size: 24px;
    flex-shrink: 0;
    width: 40px;
    text-align: center;
}

.contact-item h4 {
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 4px;
    font-weight: 400;
}

.contact-item p {
    font-size: 18px;
    font-weight: 600;
}

.contact-item a {
    color: var(--white);
}

.contact-item a:hover {
    color: var(--orange);
}

.contact-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.qr-placeholder {
    width: 200px;
    height: 200px;
    background: var(--white);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-mid);
}

.qr-icon {
    font-size: 48px;
}

.qr-hint {
    font-size: 11px !important;
    color: var(--text-light) !important;
    margin-top: 4px;
}

.qr-text {
    color: rgba(255,255,255,0.8);
    text-align: center;
    font-size: 14px;
    line-height: 1.6;
}

/* ============================================================
   Footer 页脚
   ============================================================ */
.footer {
    background: #0D1B2A;
    color: rgba(255,255,255,0.8);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
    height: 44px;
    width: auto;
    margin-bottom: 16px;
    background: var(--white);
    padding: 8px 14px;
    border-radius: 8px;
    display: block;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.footer-about {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.7;
}

.footer-brand-name {
    color: var(--white);
    font-size: 15px;
    font-weight: 700;
    margin: 4px 0 12px;
    line-height: 1.5;
}

.footer-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    padding: 8px;
    background: var(--white);
    border-radius: 10px;
    width: fit-content;
}

.footer-qr img {
    width: 72px;
    height: auto;
    display: block;
    border-radius: 4px;
}

.footer-qr span {
    color: var(--text-dark);
    font-size: 12px;
    font-weight: 600;
    line-height: 1;
}

.footer-col h4 {
    color: var(--white);
    font-size: 16px;
    margin-bottom: 20px;
    font-weight: 700;
}

.footer-col a {
    display: block;
    font-size: 14px;
    padding: 6px 0;
    opacity: 0.7;
    transition: all var(--transition);
}

.footer-col a:hover {
    opacity: 1;
    color: var(--orange);
    padding-left: 8px;
}

.footer-col p {
    font-size: 14px;
    padding: 4px 0;
    opacity: 0.7;
}

.footer-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
}

.footer-qr span {
    font-size: 12px;
    opacity: 0.7;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    opacity: 0.5;
}

.footer-links {
    margin-top: 8px;
}

.footer-links a {
    display: inline;
    padding: 0 8px;
    font-size: 13px;
}

/* ============================================================
   FAB 悬浮按钮
   ============================================================ */
.fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.fab.visible {
    opacity: 1;
    visibility: visible;
}

.fab-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.fab-qr {
    background: var(--orange);
    color: var(--white);
}

.fab-phone {
    background: #07C160;
    color: var(--white);
    text-decoration: none;
}

.fab-top {
    background: var(--blue);
    color: var(--white);
}

.fab-btn:hover {
    transform: scale(1.1);
}

/* 二维码弹窗 */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

.qr-modal.active {
    display: flex;
}

.qr-modal-content {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    position: relative;
}

.qr-modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-mid);
}

.qr-modal-content h3 {
    font-size: 20px;
    margin-bottom: 20px;
}

.qr-modal-image {
    margin: 0 auto 16px;
}

.qr-placeholder-large {
    width: 200px;
    height: 200px;
    background: var(--gray-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--text-mid);
    margin: 0 auto;
}

.qr-modal-content p {
    font-size: 14px;
    color: var(--text-mid);
    line-height: 1.6;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) translateX(-50%);
    }
    40% {
        transform: translateY(-10px) translateX(-50%);
    }
    60% {
        transform: translateY(-5px) translateX(-50%);
    }
}

/* 滚动动画 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* ============================================================
   发展历程时间轴
   ============================================================ */
.timeline-wrap {
    max-width: 860px;
    margin: 0 auto;
    position: relative;
    padding: 20px 0;
}

.timeline {
    position: relative;
    padding-left: 48px;
}

/* 垂直主线 */
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 10px;
    bottom: 10px;
    width: 3px;
    background: linear-gradient(180deg, var(--orange) 0%, var(--orange) 75%, var(--blue) 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
    padding-left: 32px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 时间轴节点 */
.timeline-dot {
    position: absolute;
    left: -41px;
    top: 4px;
    width: 18px;
    height: 18px;
    background: var(--white);
    border: 4px solid var(--orange);
    border-radius: 50%;
    z-index: 2;
    transition: all 0.4s ease;
}

.timeline-item.visible .timeline-dot {
    box-shadow: 0 0 0 6px rgba(242, 107, 43, 0.15);
}

.timeline-item:last-child .timeline-dot {
    border-color: var(--blue);
}

.timeline-item:last-child.visible .timeline-dot {
    box-shadow: 0 0 0 6px rgba(30, 58, 95, 0.15);
}

/* 年份标签 */
.timeline-year {
    display: inline-block;
    font-size: 22px;
    font-weight: 800;
    color: var(--orange);
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.timeline-item:last-child .timeline-year {
    color: var(--blue);
}

/* 阶段标题 */
.timeline-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

/* 描述文字 */
.timeline-desc {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-mid);
}

/* 时间轴底部口号 */
.timeline-slogan {
    text-align: center;
    margin-top: 56px;
    padding: 28px 40px;
    background: linear-gradient(135deg, var(--orange) 0%, var(--orange-dark) 100%);
    border-radius: 16px;
    color: var(--white);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
    box-shadow: 0 8px 30px rgba(242, 107, 43, 0.3);
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.2s;
}

.timeline-slogan.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-slogan .slogan-icon {
    font-size: 22px;
    margin-right: 8px;
}

/* ============================================================
   响应式 - 平板 (768px - 991px)
   ============================================================ */
@media (max-width: 991px) {
    :root {
        --header-height: 70px;
    }
    
    .nav-desktop {
        display: none;
    }
    
    .header-contact {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .about-image img {
        height: 300px;
    }
    
    .culture-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .process-grid {
        flex-wrap: wrap;
    }
    
    .process-step {
        flex: 0 0 calc(50% - 20px);
    }
    
    .process-arrow {
        display: none;
    }
    
    .clients-wall {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

/* ============================================================
   响应式 - 手机 (< 768px)
   ============================================================ */
@media (max-width: 767px) {
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .hero {
        min-height: 100vh;
        margin-top: var(--header-height-mobile);
    }
    
    .hero-title {
        font-size: 28px;
        letter-spacing: 2px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
    
    .hero-desc {
        font-size: 13px;
    }
    
    .hero-buttons .btn {
        padding: 12px 28px;
        font-size: 15px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .stat-number {
        font-size: 36px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .service-card {
        display: flex;
        align-items: center;
        gap: 16px;
        text-align: left;
        padding: 20px;
    }
    
    .service-icon {
        width: 60px;
        height: 60px;
        margin: 0;
        flex-shrink: 0;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .team-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .process-step {
        flex: 0 0 100%;
    }
    
    .clients-wall {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .fab {
        bottom: 20px;
        right: 20px;
    }
    
    .fab-btn {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }
}

/* ============================================================
   子页面通用样式
   ============================================================ */
.page-banner {
    background: var(--blue);
    padding: 120px 0 60px;
    text-align: center;
    color: var(--white);
    margin-top: var(--header-height);
}

.page-banner h1 {
    font-size: 42px;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 18px;
    opacity: 0.8;
}

/* 服务详情页 */
.service-detail {
    padding: 80px 0;
}

.service-detail-header {
    text-align: center;
    margin-bottom: 50px;
}

.service-detail-header img {
    max-width: 600px;
    border-radius: 12px;
    margin: 0 auto 30px;
}

.service-advantages {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 50px 0;
}

.advantage-card {
    background: var(--gray-light);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.advantage-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--orange);
}

.service-list {
    margin: 50px 0;
}

.service-list-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.service-list-item {
    background: var(--gray-light);
    padding: 20px;
    border-radius: var(--radius);
    border-left: 4px solid var(--orange);
}

.service-list-item h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.service-list-item p {
    font-size: 14px;
    color: var(--text-mid);
}

@media (max-width: 767px) {
    .page-banner {
        padding: 100px 0 40px;
    }
    
    .page-banner h1 {
        font-size: 28px;
    }
    
    .service-advantages {
        grid-template-columns: 1fr;
    }
    
    .service-list-grid {
        grid-template-columns: 1fr;
    }
}

/* 联系我们页面 */
.contact-page {
    padding: 80px 0;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

.contact-info-card {
    background: var(--gray-light);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.contact-info-card .icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.contact-info-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.qr-section {
    text-align: center;
    padding: 40px;
    background: var(--gray-light);
    border-radius: 12px;
    margin-top: 40px;
}

.qr-large {
    width: 240px;
    height: 240px;
    background: var(--white);
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 20px auto;
    font-size: 16px;
    color: var(--text-mid);
    border: 2px dashed #ddd;
}

@media (max-width: 767px) {
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
}