/* ============================================
   上饶叁幺柒科技有限公司 - 企业官网公共样式
   ============================================ */

/* CSS 变量定义 */
:root {
    --primary-color: #1a5cff;
    --primary-dark: #0d47d9;
    --primary-light: #4d85ff;
    --primary-bg: #f0f5ff;
    --secondary-color: #00c9a7;
    --text-dark: #1a1a2e;
    --text-medium: #4a4a6a;
    --text-light: #7a7a9a;
    --bg-white: #ffffff;
    --bg-light: #f8f9fc;
    --bg-dark: #0a0e27;
    --bg-gradient: linear-gradient(135deg, #0a0e27 0%, #1a1a3e 50%, #0d1b4a 100%);
    --border-color: #e8ecf4;
    --shadow-sm: 0 2px 8px rgba(26, 92, 255, 0.08);
    --shadow-md: 0 4px 20px rgba(26, 92, 255, 0.12);
    --shadow-lg: 0 8px 40px rgba(26, 92, 255, 0.16);
    --shadow-xl: 0 16px 60px rgba(26, 92, 255, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --max-width: 1200px;
    --header-height: 80px;
}

/* 全局重置 */
*,
*::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(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
    list-style: none;
}

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

button {
    border: none;
    outline: none;
    cursor: pointer;
    font-family: var(--font-family);
}

input, textarea, select {
    font-family: var(--font-family);
    outline: none;
}

/* ============================================
   头部导航
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--bg-white);
    transition: var(--transition);
}

.header.scrolled .logo {
    color: var(--text-dark);
}

.logo-icon {
    width: 42px;
    height: 42px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav a {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    position: relative;
    transition: var(--transition);
}

.header.scrolled .nav a {
    color: var(--text-medium);
}

.nav a:hover,
.nav a.active {
    color: var(--bg-white);
    background: rgba(255, 255, 255, 0.15);
}

.header.scrolled .nav a:hover,
.header.scrolled .nav a.active {
    color: var(--primary-color);
    background: var(--primary-bg);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: 8px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--bg-white);
    border-radius: 2px;
    transition: var(--transition);
}

.header.scrolled .mobile-menu-btn span {
    background: var(--text-dark);
}

/* ============================================
   Banner / Hero 区域
   ============================================ */
.hero {
    min-height: 100vh;
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(26, 92, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 10s ease-in-out infinite reverse;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 1; }
}

.hero-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--bg-white);
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-content h1 span {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ============================================
   页面 Banner（非首页）
   ============================================ */
.page-banner {
    height: 400px;
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(26, 92, 255, 0.12) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner h1 {
    font-size: 42px;
    font-weight: 800;
    color: var(--bg-white);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.page-banner .breadcrumb {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 1;
}

.page-banner .breadcrumb a {
    color: rgba(255, 255, 255, 0.6);
}

.page-banner .breadcrumb a:hover {
    color: var(--bg-white);
}

.page-banner .breadcrumb span {
    margin: 0 8px;
    color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-white);
    box-shadow: 0 4px 20px rgba(26, 92, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(26, 92, 255, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

.btn-outline-dark {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline-dark:hover {
    background: var(--primary-color);
    color: var(--bg-white);
    transform: translateY(-2px);
}

.btn-sm {
    padding: 10px 24px;
    font-size: 14px;
}

.btn-lg {
    padding: 18px 40px;
    font-size: 18px;
}

/* ============================================
   Section 通用样式
   ============================================ */
.section {
    padding: 100px 0;
}

.section-light {
    background: var(--bg-light);
}

.section-dark {
    background: var(--bg-dark);
    color: var(--bg-white);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header .tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-bg);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-dark .section-header .tag {
    background: rgba(26, 92, 255, 0.15);
}

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-dark .section-header h2 {
    color: var(--bg-white);
}

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

.section-dark .section-header p {
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   卡片样式
   ============================================ */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 40px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.card-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 28px;
    transition: var(--transition);
}

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

.card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   网格布局
   ============================================ */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

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

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ============================================
   数据统计
   ============================================ */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    padding: 60px 0;
}

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

.stat-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 15px;
    color: var(--text-light);
}

/* ============================================
   时间线
   ============================================ */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--primary-bg);
}

.timeline-item h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.timeline-item .year {
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-item p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   表单样式
   ============================================ */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text-dark);
    background: var(--bg-white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(26, 92, 255, 0.1);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand p {
    font-size: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 18px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    color: white;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--bg-white);
    margin-bottom: 24px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    padding: 6px 0;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary-light);
    transform: translateX(4px);
}

.footer-bottom {
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   动画
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 延迟动画 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }
.delay-6 { transition-delay: 0.6s; }

/* ============================================
   粒子背景
   ============================================ */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(26, 92, 255, 0.3);
    border-radius: 50%;
    animation: float linear infinite;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-10vh) rotate(720deg);
        opacity: 0;
    }
}

/* ============================================
   Hero 右侧装饰
   ============================================ */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-graphic {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1;
    position: relative;
}

.hero-graphic .ring {
    position: absolute;
    border: 2px solid rgba(26, 92, 255, 0.15);
    border-radius: 50%;
    animation: spin 20s linear infinite;
}

.hero-graphic .ring:nth-child(1) {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.hero-graphic .ring:nth-child(2) {
    width: 75%;
    height: 75%;
    top: 12.5%;
    left: 12.5%;
    animation-direction: reverse;
    animation-duration: 15s;
    border-color: rgba(0, 201, 167, 0.15);
}

.hero-graphic .ring:nth-child(3) {
    width: 50%;
    height: 50%;
    top: 25%;
    left: 25%;
    animation-duration: 10s;
}

.hero-graphic .center-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    color: white;
    box-shadow: 0 0 60px rgba(26, 92, 255, 0.4);
}

.hero-graphic .dot {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(26, 92, 255, 0.6);
}

.hero-graphic .dot:nth-child(5) { top: 0; left: 50%; transform: translateX(-50%); }
.hero-graphic .dot:nth-child(6) { bottom: 0; left: 50%; transform: translateX(-50%); }
.hero-graphic .dot:nth-child(7) { left: 0; top: 50%; transform: translateY(-50%); }
.hero-graphic .dot:nth-child(8) { right: 0; top: 50%; transform: translateY(-50%); }

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

/* ============================================
   新闻列表
   ============================================ */
.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.news-card-img {
    height: 220px;
    background: linear-gradient(135deg, var(--primary-bg), #e8f4f8);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--primary-color);
    position: relative;
    overflow: hidden;
}

.news-card-img::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(transparent, rgba(255, 255, 255, 0.8));
}

.news-card-body {
    padding: 28px;
}

.news-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.news-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-body p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   招聘卡片
   ============================================ */
.job-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.job-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.job-info h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.job-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.job-tag {
    padding: 4px 14px;
    background: var(--primary-bg);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.job-salary {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    white-space: nowrap;
    margin-left: 24px;
}

/* ============================================
   联系信息
   ============================================ */
.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
}

.contact-info-item:last-child {
    border-bottom: none;
}

.contact-info-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-bg);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.contact-info-text h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-info-text p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   地图占位
   ============================================ */
.map-placeholder {
    width: 100%;
    height: 400px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
    color: var(--text-light);
    font-size: 16px;
    border: 2px dashed var(--border-color);
}

.map-placeholder .map-icon {
    font-size: 48px;
    color: var(--primary-color);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-content p {
        margin: 0 auto 40px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-graphic {
        max-width: 350px;
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .nav {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        display: flex;
    }

    .nav a {
        color: var(--text-medium) !important;
        padding: 14px 18px;
        border-radius: var(--radius-sm);
    }

    .nav a:hover,
    .nav a.active {
        color: var(--primary-color) !important;
        background: var(--primary-bg) !important;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .container {
        padding: 0 20px;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .page-banner {
        height: 300px;
    }

    .page-banner h1 {
        font-size: 30px;
    }

    .job-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .job-salary {
        margin-left: 0;
    }
}

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: 60px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.mb-60 { margin-bottom: 60px; }
.pt-40 { padding-top: 40px; }
.pb-40 { padding-bottom: 40px; }