/* ============================================
   机加工行业网站模板 - 共享样式表
   配色：工业深蓝 + 白 + 银灰 + 橙色CTA
   ============================================ */

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

:root {
    --primary: #1a3a5c;
    --primary-dark: #0f2540;
    --primary-light: #2d5a87;
    --accent: #ff6b1a;
    --accent-dark: #e55a0e;
    --grey-900: #1a1a1a;
    --grey-700: #333333;
    --grey-500: #666666;
    --grey-300: #cccccc;
    --grey-100: #f5f5f5;
    --grey-50: #fafafa;
    --white: #ffffff;
    --success: #2ecc71;
    --border-radius: 4px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
    --transition: all 0.3s ease;
    --max-width: 1200px;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--grey-700);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

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

/* ===== 顶部工具栏 ===== */
.topbar {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.8);
    font-size: 0.8125rem;
    padding: 8px 0;
}

.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.topbar-info {
    display: flex;
    gap: 24px;
    align-items: center;
}

.topbar-info span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.topbar-info .icon {
    width: 14px;
    height: 14px;
    fill: var(--accent);
}

.topbar-links {
    display: flex;
    gap: 16px;
}

.topbar-links a:hover {
    color: var(--accent);
}

/* ===== 导航栏 ===== */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-mark {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
}

.logo span {
    color: var(--accent);
}

.nav-menu {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-menu > li > a {
    padding: 10px 18px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--grey-700);
    border-radius: var(--border-radius);
    position: relative;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: var(--primary);
    background: var(--grey-100);
}

.nav-menu > li > a.active::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

.nav-cta {
    background: var(--accent);
    color: var(--white) !important;
    padding: 10px 24px !important;
    border-radius: var(--border-radius);
    font-weight: 600;
}

.nav-cta:hover {
    background: var(--accent-dark) !important;
    color: var(--white) !important;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    justify-content: center;
}

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

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255,107,26,0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

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

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

.btn-lg {
    padding: 16px 40px;
    font-size: 1.0625rem;
}

/* ===== 页面Banner ===== */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    padding: 80px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h60v60H0z' fill='none'/%3E%3Cpath d='M30 0v60M0 30h60' stroke='%23ffffff' stroke-opacity='0.03' stroke-width='1'/%3E%3C/svg%3E");
}

.page-banner h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
}

.page-banner p {
    font-size: 1.0625rem;
    opacity: 0.85;
    position: relative;
}

.breadcrumb {
    margin-top: 16px;
    font-size: 0.875rem;
    opacity: 0.7;
    position: relative;
}

.breadcrumb a:hover {
    color: var(--accent);
}

/* ===== 区段通用 ===== */
.section {
    padding: 80px 0;
}

.section-grey {
    background: var(--grey-50);
}

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

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header .label {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

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

.section-header p {
    font-size: 1.0625rem;
    color: var(--grey-500);
    max-width: 700px;
    margin: 0 auto;
}

.section-dark .section-header p {
    color: rgba(255,255,255,0.7);
}

/* ===== Hero区 ===== */
.hero {
    position: relative;
    min-height: 660px;
    display: flex;
    align-items: center;
    background: var(--primary-dark);
    color: var(--white);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -12px;
    left: -12px;
    right: -12px;
    bottom: -12px;
    background: url("../images/hero-cnc-bg.png") center center / cover no-repeat;
    filter: blur(3px) brightness(0.7) saturate(0.9);
    transform: scale(1.05);
    z-index: 0;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, rgba(6, 16, 32, 0.6) 0%, rgba(14, 38, 62, 0.5) 45%, rgba(28, 60, 95, 0.4) 100%),
        url("data:image/svg+xml,%3Csvg width='80' height='80' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='80' height='80' patternUnits='userSpaceOnUse'%3E%3Cpath d='M80 0H0V80' fill='none' stroke='%23ffffff' stroke-width='0.5' stroke-opacity='0.05'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid)'/%3E%3C/svg%3E");
    background-size: 100% 100%, 80px 80px;
    z-index: 1;
}

.hero-brand {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: 4px;
    line-height: 1.1;
    margin-bottom: 4px;
    background: linear-gradient(90deg, #ffffff 0%, #ffd4a8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 20px rgba(255, 107, 26, 0.3);
}

.hero-brand-en {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: 6px;
    color: var(--accent);
    opacity: 0.9;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 650px;
    padding: 60px 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 0.875rem;
    margin-bottom: 24px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 20px;
}

.hero h1 span {
    color: var(--accent);
}

.hero-desc {
    font-size: 1.125rem;
    opacity: 0.85;
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 36px;
}

.hero-tags span {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8125rem;
}

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

/* ===== 数据看板 ===== */
.stats-bar {
    background: var(--white);
    box-shadow: var(--shadow-md);
    border-radius: 8px;
    padding: 40px;
    margin-top: -50px;
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.stat-item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -15px;
    top: 50%;
    transform: translateY(-50%);
    height: 50px;
    width: 1px;
    background: var(--grey-300);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-number .unit {
    font-size: 1.25rem;
    color: var(--accent);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--grey-500);
    margin-top: 8px;
}

/* ===== 核心优势 ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: var(--white);
    border: 1px solid var(--grey-100);
    border-radius: 8px;
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transition: var(--transition);
}

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

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.advantage-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--white);
}

.advantage-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 0.9375rem;
    color: var(--grey-500);
    line-height: 1.6;
}

/* ===== 服务/产品网格 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.service-image {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, var(--grey-100), var(--grey-300));
    position: relative;
    overflow: hidden;
}

.service-image svg {
    width: 100%;
    height: 100%;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.service-body {
    padding: 28px;
}

.service-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.service-body p {
    font-size: 0.9375rem;
    color: var(--grey-500);
    margin-bottom: 16px;
    line-height: 1.6;
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.service-features span {
    font-size: 0.8125rem;
    color: var(--primary);
    background: rgba(26,58,92,0.06);
    padding: 4px 12px;
    border-radius: 4px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--accent);
}

.service-link:hover {
    gap: 12px;
}

/* ===== 设备展示 ===== */
.equipment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.equipment-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.equipment-card:hover {
    box-shadow: var(--shadow-md);
}

.equipment-image {
    width: 100%;
    height: 200px;
    background: var(--grey-100);
    display: flex;
    align-items: center;
    justify-content: center;
}

.equipment-image svg {
    width: 80px;
    height: 80px;
    fill: var(--primary);
    opacity: 0.5;
}

.equipment-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.equipment-body {
    padding: 24px;
}

.equipment-body h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.equipment-body .model {
    font-size: 0.8125rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
}

.equipment-specs {
    display: grid;
    gap: 6px;
}

.equipment-specs li {
    font-size: 0.875rem;
    color: var(--grey-500);
    display: flex;
    align-items: center;
    gap: 8px;
}

.equipment-specs li::before {
    content: "•";
    color: var(--accent);
    font-weight: bold;
}

/* ===== 质量流程 ===== */
.quality-flow {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    position: relative;
}

.quality-step {
    text-align: center;
    position: relative;
}

.quality-step::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -50%;
    width: 100%;
    height: 2px;
    background: var(--grey-300);
    z-index: 0;
}

.quality-step:last-child::after {
    display: none;
}

.quality-step-num {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: var(--white);
    border: 3px solid var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.quality-step:hover .quality-step-num {
    background: var(--primary);
    color: var(--white);
}

.quality-step h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.quality-step p {
    font-size: 0.875rem;
    color: var(--grey-500);
}

/* ===== 客户LOGO墙 ===== */
.client-logos {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.client-logo {
    background: var(--white);
    border: 1px solid var(--grey-100);
    border-radius: 8px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: var(--grey-500);
    transition: var(--transition);
}

.client-logo:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* ===== 案例卡片 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.case-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.case-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 3rem;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.case-body {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(255,107,26,0.1);
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
}

.case-body h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.case-body p {
    font-size: 0.9375rem;
    color: var(--grey-500);
    margin-bottom: 16px;
}

.case-meta {
    display: flex;
    gap: 20px;
    font-size: 0.8125rem;
    color: var(--grey-500);
    padding-top: 16px;
    border-top: 1px solid var(--grey-100);
}

.case-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ===== CTA区 ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 64px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='80' height='80' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid2' width='80' height='80' patternUnits='userSpaceOnUse'%3E%3Cpath d='M80 0H0V80' fill='none' stroke='%23ffffff' stroke-width='0.5' stroke-opacity='0.05'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='100%25' height='100%25' fill='url(%23grid2)'/%3E%3C/svg%3E");
}

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

.cta-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.0625rem;
    opacity: 0.85;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== 联系/询价表单 ===== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
}

.contact-list {
    display: grid;
    gap: 20px;
    margin-bottom: 32px;
}

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

.contact-item-icon {
    width: 48px;
    height: 48px;
    background: var(--grey-100);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--primary);
}

.contact-item-info h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--grey-700);
    margin-bottom: 4px;
}

.contact-item-info p {
    font-size: 1rem;
    color: var(--primary);
    font-weight: 500;
}

.contact-item-info a {
    color: var(--primary);
    font-weight: 500;
}

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

.quote-form {
    background: var(--white);
    border-radius: 8px;
    padding: 40px;
    box-shadow: var(--shadow-md);
}

.quote-form h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.quote-form .form-desc {
    font-size: 0.9375rem;
    color: var(--grey-500);
    margin-bottom: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--grey-700);
    margin-bottom: 6px;
}

.form-group label .required {
    color: var(--accent);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--grey-300);
    border-radius: var(--border-radius);
    font-size: 0.9375rem;
    font-family: inherit;
    color: var(--grey-700);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,58,92,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.file-upload {
    border: 2px dashed var(--grey-300);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.file-upload:hover {
    border-color: var(--primary);
    background: var(--grey-50);
}

.file-upload svg {
    width: 32px;
    height: 32px;
    fill: var(--primary);
    margin: 0 auto 8px;
}

.file-upload p {
    font-size: 0.9375rem;
    color: var(--grey-500);
}

.file-upload .file-formats {
    font-size: 0.8125rem;
    color: var(--grey-500);
    margin-top: 4px;
}

.form-note {
    font-size: 0.8125rem;
    color: var(--grey-500);
    margin-top: 16px;
    line-height: 1.5;
}

/* ===== 关于我们 ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.about-image {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 12px;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 4rem;
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 1rem;
    color: var(--grey-500);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    gap: 12px;
    margin: 24px 0;
}

.about-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9375rem;
    color: var(--grey-700);
}

.about-features li svg {
    width: 20px;
    height: 20px;
    fill: var(--success);
    flex-shrink: 0;
}

/* ===== 时间线 ===== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--grey-300);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-item:nth-child(odd) .timeline-content {
    text-align: right;
}

.timeline-content {
    width: 45%;
    background: var(--white);
    padding: 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.timeline-year {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--grey-500);
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    box-shadow: 0 0 0 4px var(--white), 0 0 0 5px var(--grey-300);
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--grey-50);
}

.faq-question .faq-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 24px;
    font-size: 0.9375rem;
    color: var(--grey-500);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

/* ===== 新闻/文章列表 ===== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-image {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, var(--grey-100), var(--grey-300));
}

.news-body {
    padding: 24px;
}

.news-date {
    font-size: 0.8125rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 8px;
}

.news-body h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.news-body p {
    font-size: 0.875rem;
    color: var(--grey-500);
    line-height: 1.6;
}

/* ===== 浮动按钮 ===== */
.float-buttons {
    position: fixed;
    right: 24px;
    bottom: 80px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.float-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.float-btn svg {
    width: 24px;
    height: 24px;
}

.float-btn-quote {
    background: var(--accent);
}

.float-btn-quote svg {
    fill: var(--white);
}

.float-btn-quote:hover {
    background: var(--accent-dark);
    transform: scale(1.1);
}

.float-btn-top {
    background: var(--white);
    border: 1px solid var(--grey-300);
    opacity: 0;
    visibility: hidden;
}

.float-btn-top svg {
    fill: var(--primary);
}

.float-btn-top.visible {
    opacity: 1;
    visibility: visible;
}

.float-btn-top:hover {
    background: var(--primary);
}

.float-btn-top:hover svg {
    fill: var(--white);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--accent);
}

.footer-social svg {
    width: 18px;
    height: 18px;
    fill: var(--white);
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-col ul {
    display: grid;
    gap: 10px;
}

.footer-col ul li a {
    font-size: 0.9375rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.875rem;
}

.footer-contact-item svg {
    width: 16px;
    height: 16px;
    fill: var(--accent);
    flex-shrink: 0;
    margin-top: 3px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .advantages-grid,
    .services-grid,
    .equipment-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .stat-item:nth-child(2)::after {
        display: none;
    }

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

    .quality-step::after {
        display: none;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 768px) {
    .topbar-info {
        flex-direction: column;
        gap: 4px;
        align-items: flex-start;
    }

    .topbar-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: var(--transition);
        max-height: calc(100vh - 72px);
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-menu > li {
        width: 100%;
    }

    .nav-menu > li > a {
        display: block;
        padding: 14px 16px;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-brand {
        font-size: 2.25rem;
        letter-spacing: 2px;
    }

    .hero-brand-en {
        font-size: 0.75rem;
        letter-spacing: 3px;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .section {
        padding: 56px 0;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .advantages-grid,
    .services-grid,
    .equipment-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    .stats-bar {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 28px 20px;
    }

    .stat-item::after {
        display: none !important;
    }

    .stat-number {
        font-size: 2rem;
    }

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

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: row !important;
        padding-left: 48px;
    }

    .timeline-content {
        width: 100%;
        text-align: left !important;
    }

    .timeline-dot {
        left: 20px;
    }

    .quote-form {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-brand {
        font-size: 1.875rem;
        letter-spacing: 1px;
    }

    .hero-brand-en {
        font-size: 0.6875rem;
        letter-spacing: 2px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .cta-buttons .btn {
        width: 100%;
    }
}