/* ==========================================================================
   扬州市M88模具股份有限公司 - 全局样式表
   文件: style.css
   版本: 1.0.0
   设计规范: 工业级高对比度美学 / 响应式 / SEO 友好
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS 变量定义 (Design System)
   -------------------------------------------------------------------------- */
:root {
  /* 品牌配色系统 */
  --color-primary: #102A43;        /* 深邃工业蓝 - 彰显专业与稳重 */
  --color-primary-light: #243B53;  /* 浅深蓝 (用于 Hover / 卡片背景) */
  --color-secondary: #486581;      /* 工业中蓝 (用于次要文字与边框) */
  --color-accent: #D97706;         /* 醒目橘 (用于 CTA 按钮与视觉焦点) */
  --color-accent-hover: #B45309;   /* 醒目橘 Hover 深化 */
  --color-accent-light: #FEF3C7;   /* 浅橘色背景 */
  --color-tech-blue: #627D98;      /* 高光科技蓝 */

  /* 中性色与背景 */
  --color-bg-main: #F8FAFC;        /* 极简浅灰背景 */
  --color-bg-card: #FFFFFF;        /* 纯白背景 */
  --color-text-main: #102A43;      /* 主文本色 */
  --color-text-muted: #486581;     /* 次要文本色 */
  --color-text-light: #627D98;     /* 弱化文本色 */
  --color-border: #E2E8F0;         /* 标准边框色 */
  --color-border-hover: #CBD5E1;   /* Hover 边框色 */

  /* 字体系统 */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  --font-family-heading: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* 间距与布局 */
  --container-max-width: 1200px;
  --header-height: 80px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* 阴影系统 */
  --shadow-sm: 0 1px 3px rgba(16, 42, 67, 0.06);
  --shadow-md: 0 4px 12px rgba(16, 42, 67, 0.08);
  --shadow-lg: 0 12px 28px rgba(16, 42, 67, 0.12);
  --shadow-glow: 0 0 20px rgba(217, 119, 6, 0.35);

  /* 过渡动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. 全局重置与基础样式 (Reset & Universal)
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  color: var(--color-primary);
  line-height: 1.25;
  font-weight: 700;
}

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, input, textarea, select {
  font: inherit;
  color: inherit;
}

/* --------------------------------------------------------------------------
   3. 布局与通用组件 (Layout & Utilities)
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding: 90px 0;
  position: relative;
}

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

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

.section-bg-dark {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

/* 章节头部 (Section Header) */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-bg-dark .section-title {
  color: #FFFFFF;
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
}

.section-bg-dark .section-description {
  color: #9FB3C8;
}

/* 按钮规范与 Hover 交互 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background-color: transparent;
  border-color: #FFFFFF;
  color: #FFFFFF;
}

.btn-secondary:hover {
  background-color: #FFFFFF;
  color: var(--color-primary);
  transform: translateY(-2px) scale(1.02);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-2px) scale(1.02);
}

.btn-block {
  width: 100%;
}

/* --------------------------------------------------------------------------
   4. 吸顶导航栏 (Sticky Header)
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all var(--transition-normal);
}

.header-scrolled {
  box-shadow: var(--shadow-md);
  height: 70px;
}

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

/* 纯 CSS/SVG 文字 Logo 排版 */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -1px;
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: 0.5px;
}

.logo-subtitle {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 1px;
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary);
  position: relative;
  padding: 8px 0;
}

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

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

.nav-cta {
  display: flex;
  align-items: center;
}

/* 汉堡按钮 (手机端) */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: all var(--transition-fast);
}

/* --------------------------------------------------------------------------
   5. 英雄区 (Hero Section)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-top: calc(var(--header-height) + 80px);
  padding-bottom: 100px;
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, rgba(16, 42, 67, 0.92) 0%, rgba(36, 59, 83, 0.88) 100%), url('images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  color: #FFFFFF;
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.875rem;
  color: var(--color-accent-light);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3rem;
  color: #FFFFFF;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-description {
  font-size: 1.25rem;
  color: #BCCCDC;
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item .stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1;
}

.stat-item .stat-number span {
  color: var(--color-accent);
}

.stat-item .stat-label {
  font-size: 0.875rem;
  color: #9FB3C8;
  margin-top: 6px;
}

/* 英雄区表单卡片 */
.hero-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 32px;
  color: var(--color-text-main);
  box-shadow: var(--shadow-lg);
}

.hero-card-title {
  font-size: 1.375rem;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.hero-card-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 24px;
}

/* --------------------------------------------------------------------------
   6. 客户痛点与行业情境 (Pain Points Section)
   -------------------------------------------------------------------------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pain-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.pain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--color-border);
  transition: background-color var(--transition-fast);
}

.pain-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-hover);
}

.pain-card:hover::before {
  background-color: #EF4444; /* 警示红 */
}

.pain-icon {
  width: 50px;
  height: 50px;
  background-color: #FEE2E2;
  color: #DC2626;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.pain-title {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.pain-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   7. 精密解决方案与核心优势 (Solutions Section)
   -------------------------------------------------------------------------- */
.solution-grid {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.solution-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.solution-item:nth-child(even) {
  direction: rtl;
}

.solution-item:nth-child(even) .solution-content {
  direction: ltr;
}

.solution-image {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}

.solution-image img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.solution-item:hover .solution-image img {
  transform: scale(1.03);
}

.solution-tag {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
  display: block;
}

.solution-title {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.solution-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.solution-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.solution-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
}

.solution-feature-icon {
  color: var(--color-accent);
  font-weight: 900;
}

/* --------------------------------------------------------------------------
   8. 信任背书与资质 (Social Proof Section)
   -------------------------------------------------------------------------- */
.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 50px;
}

.proof-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.proof-icon-box {
  width: 60px;
  height: 60px;
  background-color: rgba(98, 125, 152, 0.1);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  font-size: 1.5rem;
}

.proof-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.proof-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.cert-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.cert-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}

.cert-item img {
  height: 180px;
  width: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.cert-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   9. 关于我们 (About Us Section)
   -------------------------------------------------------------------------- */
.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-image-group {
  position: relative;
}

.about-img-main {
  border-radius: var(--radius-md);
  width: 100%;
  height: 420px;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.about-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  padding: 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 220px;
}

.about-badge-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}

.about-badge-text {
  font-size: 0.875rem;
  margin-top: 6px;
  color: #D9E2EC;
}

.about-content-text p {
  margin-bottom: 16px;
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* --------------------------------------------------------------------------
   10. 常见问题 (FAQ Section)
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-icon {
  font-size: 1.25rem;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  background-color: rgba(248, 250, 252, 0.5);
}

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

.faq-answer p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   11. 终极行动呼吁与留资表单 (Final CTA Section & Form)
   -------------------------------------------------------------------------- */
.cta-box {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 60px;
  color: #FFFFFF;
  background-image: radial-gradient(circle at top right, rgba(98, 125, 152, 0.2), transparent 60%);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.cta-title {
  font-size: 2.25rem;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.cta-desc {
  color: #BCCCDC;
  font-size: 1.0625rem;
  margin-bottom: 30px;
}

.contact-direct {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-direct-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}

.contact-direct-icon {
  color: var(--color-accent);
}

/* 表单控件通用规范 */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9375rem;
  background-color: var(--color-bg-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  background-color: #FFFFFF;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15);
}

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

/* --------------------------------------------------------------------------
   12. 页尾 (Footer)
   -------------------------------------------------------------------------- */
.footer {
  background-color: #091A2A;
  color: #9FB3C8;
  padding-top: 70px;
  padding-bottom: 30px;
  font-size: 0.875rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-logo .logo-title {
  color: #FFFFFF;
}

.footer-logo .logo-subtitle {
  color: #627D98;
}

.footer-about {
  margin-top: 16px;
  line-height: 1.6;
}

.footer-heading {
  color: #FFFFFF;
  font-size: 1rem;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-beian {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-beian a {
  color: #9FB3C8;
}

.footer-beian a:hover {
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   13. 响应式适配 (Responsive Media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
  }
  
  .pain-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .cta-box {
    grid-template-columns: 1fr;
    padding: 40px;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

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

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: #FFFFFF;
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 20px;
    gap: 24px;
    transition: left var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-cta {
    display: none;
  }

  .hero-title {
    font-size: 2.25rem;
  }

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

  .solution-item, .solution-item:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }

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

  .about-badge {
    position: relative;
    right: 0;
    bottom: 0;
    margin-top: -40px;
    margin-left: 20px;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .pain-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-stats {
    grid-template-columns: 1fr;
  }
}