/* ==========================================================================
   苏州市仿艺纺织有限公司 - 官方网站核心样式表
   Design System & Premium Aesthetics Framework
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS 变量与设计系统 (Design System Variables)
   -------------------------------------------------------------------------- */
:root {
  /* 色彩规范 */
  --color-primary: #1a2b4c;         /* 深邃纺织蓝 - 代表稳重与品质 */
  --color-primary-dark: #0f2027;    /* 深邃夜空蓝 - 用于深色背景与强对比 */
  --color-primary-light: #2c426e;   /* 亮纺织蓝 - 悬停与次级元素 */
  
  --color-accent: #d4af37;          /* 奢华金色 - 用于核心 CTA 与质感点缀 */
  --color-accent-hover: #c5a059;    /* 金色悬停态 */
  --color-accent-light: #f4e8c1;    /* 浅金淡彩 */

  --color-text-main: #2d3748;       /* 主文本深灰 - 保证极佳阅读体验 */
  --color-text-muted: #64748b;      /* 次要文本 - 柔和说明 */
  --color-text-light: #f8f9fa;      /* 反白文本 */

  --color-bg-main: #ffffff;         /* 纯白背景 */
  --color-bg-alt: #f8f9fa;          /* 高质感浅灰背景 - 用于交替区块 */
  --color-bg-card: #ffffff;         /* 卡片背景 */

  --color-border: #e2e8f0;          /* 边框分割线 */
  --color-border-hover: #cbd5e1;

  /* 阴影系统 */
  --shadow-sm: 0 2px 4px rgba(26, 43, 76, 0.05);
  --shadow-md: 0 10px 25px rgba(26, 43, 76, 0.08);
  --shadow-lg: 0 20px 40px rgba(26, 43, 76, 0.12);
  --shadow-accent: 0 8px 20px rgba(212, 175, 55, 0.25);

  /* 字体与排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-serif: "Songti SC", "Noto Serif SC", STSong, "Georgia", serif; /* 赋予品牌故事与高级视觉适当的衬线感 */

  /* 布局与间距 */
  --max-width: 1280px;
  --header-height: 80px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* 微交互过渡时间 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* --------------------------------------------------------------------------
   2. 全局重置与基础设定 (Global Reset & Base Setup)
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: 1.7;
  letter-spacing: 0.2px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

/* --------------------------------------------------------------------------
   3. 通用排版与辅助类 (Typography & Utility Classes)
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section-padding {
  padding-top: 100px;
  padding-bottom: 100px;
}

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

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-subtitle {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  position: relative;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* 统一按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
  position: relative;
  z-index: 1;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(212, 175, 55, 0.35);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-light);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-text-light);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   4. 置顶吸顶导览列 (Header / Navigation)
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(26, 43, 76, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: background-color var(--transition-normal);
}

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

/* 纯 CSS/SVG 文字造型 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #b38f2a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-primary-dark);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: -1px;
}

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

.logo-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-light);
  letter-spacing: 1px;
  line-height: 1.1;
}

.logo-subtitle {
  font-size: 0.65rem;
  color: var(--color-accent);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

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

.nav-link {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  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-normal);
}

.nav-link:hover {
  color: var(--color-text-light);
}

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

.header-cta .btn {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* 移动端汉堡按钮 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-light);
  transition: all var(--transition-normal);
}

/* --------------------------------------------------------------------------
   5. 英雄区 (Hero Section)
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 80px;
  display: flex;
  align-items: center;
  background-color: var(--color-primary-dark);
  background-image: linear-gradient(135deg, rgba(15, 32, 39, 0.88) 0%, rgba(26, 43, 76, 0.80) 100%), url('/images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--color-text-light);
}

.hero-content {
  max-width: 800px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: rgba(212, 175, 55, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: 50px;
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-title span {
  color: var(--color-accent);
  background: linear-gradient(120deg, #f4e8c1 0%, #d4af37 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 40px;
  line-height: 1.8;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}

.hero-stats {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.stat-item .stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-item .stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

/* --------------------------------------------------------------------------
   6. 痛点与场景 (Pain Points Section)
   -------------------------------------------------------------------------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.pain-card {
  background-color: var(--color-bg-main);
  padding: 36px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.pain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: #e53e3e; /* 痛点警示色 */
  opacity: 0.7;
}

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

.pain-icon {
  width: 50px;
  height: 50px;
  background-color: #fff5f5;
  color: #e53e3e;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.pain-card h3 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.pain-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   7. 解决方案与核心优势 (Solutions & Services)
   -------------------------------------------------------------------------- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 32px;
}

.solution-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.solution-img-wrapper {
  position: relative;
  height: 220px;
  overflow: hidden;
  background-color: #e2e8f0;
}

.solution-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.solution-card:hover .solution-img-wrapper img {
  transform: scale(1.05);
}

.solution-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background-color: var(--color-primary);
  color: var(--color-text-light);
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.solution-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.solution-body h3 {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.solution-body p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.solution-features {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.solution-features li {
  font-size: 0.875rem;
  color: var(--color-text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.solution-features li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: bold;
}

/* --------------------------------------------------------------------------
   8. 信任背书 (Social Proof / E-E-A-T)
   -------------------------------------------------------------------------- */
.proof-section {
  background-color: var(--color-primary-dark);
  color: var(--color-text-light);
}

.proof-section .section-title {
  color: var(--color-text-light);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.cert-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 30px 20px;
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-normal);
}

.cert-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.cert-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.cert-desc {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}

/* 案例展示 */
.case-wrapper {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.case-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.case-img {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.case-content h4 {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.case-content p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.65);
}

/* --------------------------------------------------------------------------
   9. 关于我们 (About Us - Local SEO)
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h2 {
  font-size: 2.25rem;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
  line-height: 1.8;
}

.contact-info-list {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

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

.contact-info-icon {
  width: 40px;
  height: 40px;
  background-color: var(--color-bg-alt);
  color: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}

.contact-info-details h5 {
  font-size: 0.9rem;
  color: var(--color-primary);
}

.contact-info-details p {
  font-size: 0.95rem;
  color: var(--color-text-main);
  margin-bottom: 0;
}

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

.about-main-img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   10. 常见问题 (FAQ Section)
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.faq-question {
  padding: 24px 30px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--color-accent);
  transition: transform var(--transition-normal);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  background-color: rgba(248, 249, 250, 0.5);
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 30px 24px 30px;
}

.faq-answer p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   11. 终极呼吁与联系表单 (CTA & Contact Form)
   -------------------------------------------------------------------------- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-light);
  position: relative;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.cta-info h2 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 20px;
}

.cta-info p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 30px;
}

.form-wrapper {
  background: #ffffff;
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  color: var(--color-text-main);
}

.form-wrapper h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.form-wrapper p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

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

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.15);
}

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

.btn-block {
  width: 100%;
}

/* --------------------------------------------------------------------------
   12. 页尾 (Footer)
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #0b171c;
  color: rgba(255, 255, 255, 0.6);
  padding-top: 60px;
  padding-bottom: 30px;
  font-size: 0.875rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.footer-brand .logo-title {
  font-size: 1.1rem;
}

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

.footer-title {
  color: var(--color-text-light);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 10px;
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.icp-link {
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.icp-link:hover {
  color: var(--color-accent);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-divider {
  color: rgba(255, 255, 255, 0.2);
  font-size: 0.8rem;
}

/* --------------------------------------------------------------------------
   13. 响应式适配 (Responsive Media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .about-grid, .cta-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-primary-dark);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }

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

  .header-cta {
    display: none;
  }

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

  .hero-stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

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