/**
 * 惠州市一心科技有限公司 - 企业官网样式
 * 简约大气风格
 */

/* ========== CSS变量 ========== */
:root {
    /* 主色调 - 科技蓝 */
    --color-primary: #1a56db;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    
    /* 辅助色 */
    --color-accent: #0ea5e9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    
    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* 过渡 */
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: var(--font-family);
    color: var(--color-gray-700);
    background-color: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

/* ========== 容器 ========== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

.header.scrolled {
    border-bottom-color: var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
}

.logo-text {
    color: var(--color-gray-800);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav__link {
    position: relative;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-600);
    padding: 8px 0;
    transition: var(--transition);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

/* 汉堡菜单 */
.nav__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: var(--transition);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav__toggle.active .hamburger {
    background: transparent;
}

.nav__toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav__toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    line-height: 1.4;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(26, 86, 219, 0.35);
}

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

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

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

.btn--white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--lg {
    padding: 16px 36px;
    font-size: 1.05rem;
}

.btn--full {
    width: 100%;
}

/* ========== Section通用 ========== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section__title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.section__desc {
    font-size: 1.1rem;
    color: var(--color-gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== Hero区域 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 72px;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #0f172a 0%, #1a56db 50%, #0ea5e9 100%);
    z-index: 0;
}

.hero__bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.3) 0%, transparent 50%);
}

.hero__content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-2xl);
    align-items: center;
    padding: var(--spacing-2xl) 0;
}

.hero__title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero__title .highlight {
    background: linear-gradient(135deg, #60a5fa, #34d399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-xl);
    max-width: 520px;
    line-height: 1.8;
}

.hero__actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero__stats {
    display: flex;
    gap: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl) var(--spacing-lg);
}

.stat-item {
    text-align: center;
    min-width: 90px;
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 4px;
}

/* ========== 核心优势 ========== */
.advantages {
    background: var(--color-gray-50);
}

.advantages__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.advantage-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--color-gray-200);
}

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

.advantage-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.1), rgba(14, 165, 233, 0.1));
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.advantage-card__title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.advantage-card__desc {
    font-size: 0.95rem;
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ========== 产品简介 ========== */
.product-intro {
    background: var(--color-white);
}

.product-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.product-feature {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-gray-50);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition);
}

.product-feature:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-md);
}

.feature-num {
    font-size: 2.5rem;
    font-weight: 700;
    color: rgba(26, 86, 219, 0.15);
    margin-bottom: var(--spacing-sm);
}

.product-feature h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.product-feature p {
    font-size: 0.9rem;
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ========== CTA区域 ========== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    padding: var(--spacing-2xl) 0;
}

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

.cta-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-xl);
}

/* ========== 页面横幅 ========== */
.page-banner {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    padding: calc(72px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    text-align: center;
}

.page-banner h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.page-banner p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
}

/* ========== 关于我们页面 ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-content h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.about-content h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.about-content p {
    font-size: 1rem;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.image-placeholder {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    color: var(--color-gray-400);
}

.image-placeholder span {
    font-size: 1.2rem;
    font-weight: 600;
}

/* 企业文化 */
.culture-section {
    background: var(--color-gray-50);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.culture-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--color-gray-200);
}

.culture-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.culture-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.culture-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.culture-item p {
    color: var(--color-gray-500);
    font-size: 0.95rem;
}

/* 数据统计 */
.stats-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-box {
    padding: var(--spacing-lg);
}

.stat-big {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
}

.stat-box p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1rem;
    margin-top: var(--spacing-xs);
}

/* 团队优势 */
.team-section {
    background: var(--color-gray-50);
}

.team-advantages {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.team-adv-item {
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--color-primary);
    transition: var(--transition);
}

.team-adv-item:hover {
    box-shadow: var(--shadow-md);
}

.team-adv-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.team-adv-item p {
    color: var(--color-gray-500);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========== 产品服务页面 ========== */
.product-overview {
    background: var(--color-white);
}

.overview-content {
    max-width: 800px;
    margin: 0 auto;
}

.feature-list {
    margin-top: var(--spacing-lg);
}

.feature-list li {
    padding: 8px 0;
    color: var(--color-gray-600);
    font-size: 1rem;
}

/* 功能模块 */
.modules-section {
    background: var(--color-gray-50);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.module-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
    transition: var(--transition);
}

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

.module-card--featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: auto 1fr;
}

.module-card__header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(26, 86, 219, 0.05), rgba(14, 165, 233, 0.05));
    border-bottom: 1px solid var(--color-gray-100);
}

.module-card--featured .module-card__header {
    writing-mode: vertical-lr;
    text-align: center;
    border-bottom: none;
    border-right: 1px solid var(--color-gray-100);
    min-width: 60px;
}

.module-icon {
    font-size: 2rem;
}

.module-card--featured .module-icon {
    writing-mode: horizontal-tb;
    transform: rotate(0);
}

.module-card__header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-top: var(--spacing-sm);
}

.module-card--featured .module-card__header h3 {
    margin-top: 0;
}

.module-card__body {
    padding: var(--spacing-lg);
}

.module-card__body > p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    font-size: 0.98rem;
    line-height: 1.7;
}

.module-card__body ul li {
    padding: 6px 0 6px 16px;
    color: var(--color-gray-500);
    font-size: 0.92rem;
    position: relative;
}

.module-card__body ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 600;
}

/* 服务流程 */
.service-process {
    background: var(--color-white);
}

.process-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.process-step {
    text-align: center;
    flex: 0 0 160px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    border-radius: 50%;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.process-step h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.process-step p {
    font-size: 0.85rem;
    color: var(--color-gray-500);
    line-height: 1.5;
}

.process-arrow {
    font-size: 1.5rem;
    color: var(--color-gray-300);
    margin-top: 28px;
    font-weight: 300;
}

/* 技术特点 */
.tech-features {
    background: var(--color-gray-50);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.tech-item {
    padding: var(--spacing-lg);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    transition: var(--transition);
}

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

.tech-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.tech-item p {
    font-size: 0.93rem;
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ========== 联系我们页面 ========== */
.contact-section {
    background: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.contact-info h2,
.contact-form-wrapper h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.contact-intro,
.form-intro {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xl);
    font-size: 0.98rem;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-item__icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-item__content h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-gray-400);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item__content p {
    color: var(--color-gray-700);
    font-size: 1rem;
    line-height: 1.6;
}

.contact-item__content a {
    color: var(--color-primary);
}

.contact-item__content a:hover {
    color: var(--color-primary-dark);
}

/* 表单 */
.contact-form-wrapper {
    background: var(--color-gray-50);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-gray-200);
}

.form-success,
.form-error {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
}

.form-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.contact-form .form-group {
    margin-bottom: var(--spacing-md);
}

.contact-form label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: 6px;
}

.contact-form label span {
    color: #ef4444;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-family: var(--font-family);
    color: var(--color-gray-800);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--color-gray-400);
}

/* 地图区域 */
.map-placeholder {
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    border-radius: var(--radius-xl);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-content {
    text-align: center;
    color: var(--color-gray-400);
}

.map-content svg {
    margin-bottom: var(--spacing-md);
}

.map-content h3 {
    font-size: 1.2rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
}

.map-note {
    font-size: 0.85rem !important;
    color: var(--color-gray-400) !important;
    margin-top: var(--spacing-sm);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: var(--spacing-2xl) 0 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.2fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: var(--spacing-md);
}

.footer__logo .logo-text {
    color: var(--color-white);
}

.footer__desc {
    font-size: 0.93rem;
    line-height: 1.7;
    color: var(--color-gray-400);
}

.footer__links h4,
.footer__contact h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer__links ul li {
    margin-bottom: 10px;
}

.footer__links a {
    font-size: 0.93rem;
    color: var(--color-gray-400);
}

.footer__links a:hover {
    color: var(--color-white);
}

.footer__contact p {
    font-size: 0.93rem;
    margin-bottom: 10px;
}

.footer__bottom {
    text-align: center;
    padding: var(--spacing-lg) 0;
    font-size: 0.88rem;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    font-size: 1.3rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ========== 响应式设计 ========== */

/* 平板端 */
@media (max-width: 1024px) {
    .hero__title {
        font-size: 2.5rem;
    }
    
    .hero__content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero__subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero__actions {
        justify-content: center;
    }
    
    .hero__stats {
        justify-content: center;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
    
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .module-card--featured {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }
    
    .module-card--featured .module-card__header {
        writing-mode: horizontal-tb;
        border-right: none;
        border-bottom: 1px solid var(--color-gray-100);
    }
    
    .footer__grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        gap: var(--spacing-md);
    }
    
    .process-arrow {
        display: none;
    }
    
    .process-step {
        flex: 0 0 140px;
    }
}

/* 手机端 */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3.5rem;
    }
    
    .nav__menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-white);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .nav__menu.active {
        transform: translateX(0);
    }
    
    .nav__list {
        flex-direction: column;
        gap: 0;
    }
    
    .nav__link {
        display: block;
        padding: 14px 0;
        border-bottom: 1px solid var(--color-gray-100);
    }
    
    .nav__toggle {
        display: block;
    }
    
    .hero {
        min-height: auto;
        padding: calc(72px + var(--spacing-xl)) 0 var(--spacing-xl);
    }
    
    .hero__title {
        font-size: 1.8rem;
    }
    
    .hero__subtitle {
        font-size: 1rem;
    }
    
    .hero__stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stat-item {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        text-align: left;
    }
    
    .stat-number {
        font-size: 1.8rem;
    }
    
    .section__title {
        font-size: 1.6rem;
    }
    
    .page-banner {
        padding: calc(72px + var(--spacing-xl)) 0 var(--spacing-xl);
    }
    
    .page-banner h1 {
        font-size: 1.8rem;
    }
    
    .advantages__grid,
    .product-features,
    .culture-grid,
    .team-advantages,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-big {
        font-size: 2.2rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer__grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .process-steps {
        flex-direction: column;
        align-items: center;
    }
    
    .process-step {
        flex: none;
        width: 100%;
        max-width: 280px;
    }
    
    .cta-content h2 {
        font-size: 1.5rem;
    }
    
    .btn--lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero__title {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 10px 22px;
        font-size: 0.95rem;
    }
}