/* ============================
   陕西沫清风户外用品 - 全局样式
   工业风格 · 大气沉稳
   ============================ */

/* CSS 变量系统 */
:root {
  --color-primary: #1B2A4A;
  --color-primary-light: #243660;
  --color-primary-dark: #0F1A30;
  --color-secondary: #2D2D2D;
  --color-accent: #D4880F;
  --color-accent-hover: #B8750D;
  --color-bg: #F5F5F0;
  --color-bg-dark: #E8E8E3;
  --color-text: #1A1A1A;
  --color-text-light: #6B7280;
  --color-text-white: #FFFFFF;
  --color-border: #E5E5E5;
  --color-card-bg: #FFFFFF;
  --font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;
  --radius: 2px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);
  --container-width: 1200px;
  --nav-height: 72px;
  --transition-fast: 200ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 600ms ease-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.75;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 容器 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================
   导航栏
   ============================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-primary);
  z-index: 1000;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
  background: var(--color-primary-dark);
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-white);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  color: #fff;
  border-radius: var(--radius);
}

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

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-normal);
}

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

.nav-phone {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.nav-phone svg {
  width: 18px;
  height: 18px;
  fill: var(--color-accent);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-white);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--color-primary-dark);
  z-index: 999;
  padding: calc(var(--nav-height) + var(--spacing-xl)) var(--spacing-xl) var(--spacing-xl);
  transition: right var(--transition-normal);
  overflow-y: auto;
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu a {
  display: block;
  color: rgba(255,255,255,0.85);
  font-size: 1rem;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--color-accent);
  padding-left: var(--spacing-sm);
}

.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.mobile-overlay.active {
  opacity: 1;
}

/* ============================
   面包屑
   ============================ */
.breadcrumb {
  padding: var(--spacing-lg) 0;
  margin-top: var(--nav-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.breadcrumb-list a {
  color: var(--color-text-light);
  transition: color var(--transition-fast);
}

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

.breadcrumb-list .separator {
  color: var(--color-border);
}

.breadcrumb-list .current {
  color: var(--color-text);
  font-weight: 500;
}

/* ============================
   Hero 区域
   ============================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 0;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 26, 48, 0.7);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-white);
  padding: 0 var(--spacing-lg);
  max-width: 800px;
}

.hero-tag {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 0.02em;
}

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

.hero-desc {
  font-size: 1.125rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--spacing-2xl);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================
   按钮
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(212,136,15,0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-white);
  border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

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

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

/* ============================
   区域标题
   ============================ */
.section {
  padding: var(--spacing-4xl) 0;
}

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

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

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.section-dark .section-tag {
  color: var(--color-accent);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.section-dark .section-title {
  color: var(--color-text-white);
}

.section-desc {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.75;
}

.section-dark .section-desc {
  color: rgba(255,255,255,0.65);
}

/* ============================
   数字计数器
   ============================ */
.stats-bar {
  background: var(--color-primary);
  padding: var(--spacing-3xl) 0;
}

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

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

.stat-number {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
}

.stat-suffix {
  font-size: 1.5rem;
  font-weight: 600;
}

.stat-label {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
  font-weight: 400;
}

/* ============================
   卡片系统
   ============================ */
.card-grid {
  display: grid;
  gap: var(--spacing-xl);
}

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

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

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

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  background: rgba(212,136,15,0.1);
  padding: 3px 10px;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.card-text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

.card-link {
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast);
}

.card-link:hover {
  gap: 8px;
}

/* ============================
   产品特性图标卡片
   ============================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: rgba(212,136,15,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--radius);
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  fill: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================
   手风琴
   ============================ */
.accordion {
  max-width: 800px;
  margin: 0 auto;
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-md);
  background: var(--color-card-bg);
  overflow: hidden;
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.accordion-header:hover {
  background: var(--color-bg);
}

.accordion-item.active .accordion-header {
  background: var(--color-primary);
  color: var(--color-text-white);
}

.accordion-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

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

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 400ms ease;
}

.accordion-body-inner {
  padding: var(--spacing-lg);
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ============================
   Lightbox
   ============================ */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.9);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 85vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.lightbox-close:hover {
  background: rgba(255,255,255,0.2);
}

/* ============================
   评分星星
   ============================ */
.stars {
  display: flex;
  gap: 2px;
  color: var(--color-accent);
  font-size: 1rem;
}

/* ============================
   Footer
   ============================ */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand h3 {
  color: var(--color-text-white);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.75;
  margin-bottom: var(--spacing-lg);
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9375rem;
}

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

.footer h4 {
  color: var(--color-text-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
}

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.65);
  font-size: 0.9375rem;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: var(--spacing-sm);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-bottom a {
  color: rgba(255,255,255,0.4);
  transition: color var(--transition-fast);
}

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

/* ============================
   动画类
   ============================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 600ms ease-out, transform 600ms ease-out;
}

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

.fade-up-delay-1 { transition-delay: 100ms; }
.fade-up-delay-2 { transition-delay: 200ms; }
.fade-up-delay-3 { transition-delay: 300ms; }
.fade-up-delay-4 { transition-delay: 400ms; }

/* ============================
   页面标题区
   ============================ */
.page-hero {
  margin-top: var(--nav-height);
  background: var(--color-primary);
  color: var(--color-text-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60"><rect width="60" height="60" fill="none"/><line x1="0" y1="60" x2="60" y2="0" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></svg>');
}

.page-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  position: relative;
}

.page-hero p {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.65);
  margin-top: var(--spacing-md);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* ============================
   资质网格
   ============================ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.cert-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.cert-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.cert-item .cert-name {
  padding: var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-text);
}

/* ============================
   新闻列表
   ============================ */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.news-item {
  display: flex;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.news-item img {
  width: 280px;
  min-height: 180px;
  object-fit: cover;
  flex-shrink: 0;
}

.news-item-body {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-item-date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  margin-bottom: var(--spacing-sm);
}

.news-item h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.news-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================
   联系表单
   ============================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
}

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

.form-group label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px var(--spacing-md);
  font-size: 0.9375rem;
  font-family: var(--font-family);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212,136,15,0.15);
}

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

.contact-info-card {
  background: var(--color-primary);
  color: var(--color-text-white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius);
}

.contact-info-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

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

.contact-info-item svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-info-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-info-item p {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.7);
}

/* ============================
   白皮书列表
   ============================ */
.whitepaper-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.whitepaper-item {
  display: flex;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  gap: var(--spacing-lg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.whitepaper-icon {
  width: 56px;
  height: 56px;
  background: rgba(212,136,15,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  flex-shrink: 0;
}

.whitepaper-icon svg {
  width: 28px;
  height: 28px;
  fill: var(--color-accent);
}

.whitepaper-item h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.whitepaper-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================
   白皮书 - 文章版专用样式
   ============================ */
.wp-conclusions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.wp-conclusion-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  position: relative;
  padding-left: calc(var(--spacing-xl) + 50px);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.wp-conclusion-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.1);
}

.wp-conclusion-num {
  position: absolute;
  left: var(--spacing-lg);
  top: var(--spacing-xl);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.wp-conclusion-text {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
}

.wp-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--color-text);
}

.wp-content p {
  margin-bottom: var(--spacing-md);
}

.wp-block {
  margin-bottom: var(--spacing-xxl);
}

.wp-h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
  line-height: 1.4;
}

/* 数据行 */
.wp-data-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.wp-data-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  text-align: center;
}

.wp-data-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
  font-variant-numeric: tabular-nums;
}

.wp-data-label {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* 痛点卡片 */
.wp-pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.wp-pain-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.wp-pain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.1);
}

.wp-pain-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: rgba(212, 136, 15, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
}

.wp-pain-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--color-accent);
}

.wp-pain-card h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.wp-pain-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 技术参数网格 */
.wp-tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.wp-tech-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
}

.wp-tech-item.wp-tech-warning {
  border-color: var(--color-accent);
  background: rgba(212, 136, 15, 0.04);
}

.wp-tech-label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.wp-tech-text {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.7;
}

/* 工艺流程 */
.wp-process-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.wp-process-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
}

.wp-process-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
  min-width: 40px;
  font-variant-numeric: tabular-nums;
}

.wp-process-text {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.7;
}

/* 高亮框 */
.wp-highlight {
  margin-top: var(--spacing-xl);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  padding: var(--spacing-xl);
}

.wp-highlight-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.wp-highlight p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.9);
}

/* 对比表加强 */
.wp-compare-table td:first-child {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

/* 选型建议 */
.wp-advice-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.wp-advice-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  border-left: 4px solid var(--color-accent);
}

.wp-advice-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.wp-advice-text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 能力卡片 */
.wp-capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.wp-capability-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.wp-capability-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.1);
}

/* ============================
   质保承诺书
   ============================ */
.warranty-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.warranty-image {
  position: relative;
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(27, 42, 74, 0.15);
  border: 1px solid var(--color-border);
}

.warranty-image img {
  width: 100%;
  height: auto;
  display: block;
}

.warranty-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  padding-top: var(--spacing-md);
}

.warranty-item {
  padding: var(--spacing-lg);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  border-left: 3px solid var(--color-accent);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.warranty-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(27, 42, 74, 0.1);
}

.warranty-item h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 6px 0;
}

.warranty-item p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .warranty-wrap {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  .warranty-image {
    max-width: 500px;
    margin: 0 auto;
  }
  .warranty-highlights {
    padding-top: 0;
  }
}

.wp-capability-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  border-radius: var(--radius);
  background: rgba(212, 136, 15, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.wp-capability-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
}

.wp-capability-card h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.wp-capability-card p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* ============================
   FAQ 手风琴
   ============================ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--color-accent);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  background: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg);
}

.faq-question[aria-expanded="true"] {
  color: var(--color-accent);
}

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  fill: var(--color-text-light);
  transition: transform var(--transition-normal);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 400ms ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 var(--spacing-xl) var(--spacing-lg);
  color: var(--color-text-light);
  line-height: 1.75;
  font-size: 0.9375rem;
}

/* ============================
   新闻列表
   ============================ */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.news-item {
  display: flex;
  gap: var(--spacing-xl);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

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

.news-item img {
  width: 280px;
  min-height: 180px;
  object-fit: cover;
  flex-shrink: 0;
}

.news-item-body {
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.news-item-date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  margin-bottom: var(--spacing-xs);
}

.news-item-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  line-height: 1.5;
}

.news-item-body p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

@media (max-width: 768px) {
  .news-item {
    flex-direction: column;
  }
  .news-item img {
    width: 100%;
    height: 200px;
  }
  .news-item-body {
    padding: var(--spacing-lg);
  }
}

/* ============================
   新闻详情
   ============================ */
.article-content {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-3xl);
  line-height: 1.9;
}

.article-content h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin: var(--spacing-2xl) 0 var(--spacing-lg);
  padding-left: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
}

.article-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: var(--spacing-xl) 0 var(--spacing-md);
}

.article-content p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.article-content ul {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.article-content ul li {
  list-style: disc;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.article-content strong {
  color: var(--color-primary);
}

.article-meta {
  display: flex;
  gap: var(--spacing-xl);
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .article-content {
    padding: var(--spacing-lg);
  }
}

/* ============================
   案例评价
   ============================ */
.testimonial-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.testimonial-text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-lg);
  border-left: 3px solid var(--color-accent);
}

.star-rating {
  color: var(--color-accent);
  font-size: 1.125rem;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
  border-radius: var(--radius);
}

.testimonial-name {
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-role {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* ============================
   产品价格表
   ============================ */
.price-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.price-table th {
  background: var(--color-primary);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-weight: 600;
  font-size: 0.9375rem;
}

.price-table td {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.price-table tr:hover td {
  background: var(--color-bg);
}

.price-table .price {
  color: var(--color-accent);
  font-weight: 700;
  font-family: var(--font-mono);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: var(--spacing-2xl);
}

.timeline-dot {
  position: absolute;
  left: 16px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 3px solid var(--color-bg);
}

.timeline-item h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.timeline-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ============================
   响应式
   ============================ */
@media (max-width: 1024px) {
  .card-grid-3,
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .hero h1 {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-4xl: 64px;
    --spacing-3xl: 48px;
  }

  .nav-links,
  .nav-phone {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  .mobile-overlay {
    display: block;
    pointer-events: none;
  }

  .mobile-overlay.active {
    pointer-events: auto;
  }

  .card-grid-3,
  .card-grid-2,
  .card-grid-4,
  .feature-grid,
  .cert-grid,
  .whitepaper-list,
  .contact-grid,
  .wp-conclusions,
  .wp-pain-grid,
  .wp-tech-grid,
  .wp-process-grid,
  .wp-advice-grid,
  .wp-capability-grid {
    grid-template-columns: 1fr;
  }

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

  .wp-conclusion-card {
    padding-left: calc(var(--spacing-lg) + 50px);
  }

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

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

  .hero h1 {
    font-size: 2rem;
  }

  .hero {
    min-height: 500px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .news-item {
    flex-direction: column;
  }

  .news-item img {
    width: 100%;
    height: 200px;
  }

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

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

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.625rem;
  }

  .stat-number {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

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

@media (min-width: 481px) and (max-width: 1024px) {
  .wp-conclusions {
    grid-template-columns: 1fr;
  }

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

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

  .wp-tech-grid {
    grid-template-columns: 1fr;
  }

  .wp-process-grid {
    grid-template-columns: 1fr;
  }
}