/* 多德陆模切网 (duodlu.com) - 德系工业精工视觉系统 (DDL Design System) */
:root {
  --ddl-bg-deep: #0b0f17;
  --ddl-bg-canvas: #111622;
  --ddl-bg-surface: #171e2e;
  --ddl-bg-card: #1c2438;
  --ddl-bg-card-hover: #222c44;
  --ddl-border: #2b3752;
  --ddl-border-subtle: #1e283d;
  
  --ddl-gold: #f5a623;
  --ddl-gold-hover: #e09315;
  --ddl-gold-glow: rgba(245, 166, 35, 0.2);
  
  --ddl-cyan: #00d2b4;
  --ddl-cyan-glow: rgba(0, 210, 180, 0.15);
  --ddl-blue: #2563eb;
  
  --ddl-text-primary: #f0f4fc;
  --ddl-text-secondary: #94a3b8;
  --ddl-text-muted: #64748b;
  
  --ddl-radius-sm: 6px;
  --ddl-radius-md: 10px;
  --ddl-radius-lg: 16px;
  --ddl-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  --ddl-shadow-glow: 0 0 25px rgba(245, 166, 35, 0.15);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--ddl-bg-deep);
  color: var(--ddl-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部精工导航 */
.site-header {
  background: rgba(17, 22, 34, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ddl-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--ddl-gold), #b37400);
  border-radius: var(--ddl-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: #0b0f17;
  box-shadow: 0 2px 10px rgba(245, 166, 35, 0.3);
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-main {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(90deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 11px;
  color: var(--ddl-cyan);
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ddl-text-secondary);
  border-radius: var(--ddl-radius-sm);
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
  color: var(--ddl-gold);
  font-weight: 600;
}

.header-action {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header-rfq {
  background: linear-gradient(135deg, var(--ddl-gold), #d98205);
  color: #0b0f17;
  font-weight: 700;
  font-size: 13px;
  padding: 9px 18px;
  border-radius: var(--ddl-radius-sm);
  display: flex;
  align-items: center;
  gap: 6px;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 12px var(--ddl-gold-glow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-header-rfq:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 18px rgba(245, 166, 35, 0.35);
}

/* 城市分站切换浮条 */
.city-strip {
  background: var(--ddl-bg-surface);
  border-bottom: 1px solid var(--ddl-border-subtle);
  font-size: 12px;
  padding: 7px 0;
}

.city-strip-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow-x: auto;
  white-space: nowrap;
}

.city-strip-label {
  color: var(--ddl-text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
}

.city-chip {
  color: var(--ddl-text-secondary);
  padding: 2px 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--ddl-border-subtle);
  border-radius: 12px;
  transition: all 0.2s ease;
}

.city-chip:hover, .city-chip.current {
  color: var(--ddl-gold);
  border-color: var(--ddl-gold);
  background: var(--ddl-gold-glow);
}

/* 面包屑导航 */
.breadcrumb-wrap {
  padding: 14px 0 6px;
  font-size: 13px;
  color: var(--ddl-text-muted);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.breadcrumb-item a:hover {
  color: var(--ddl-gold);
}

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

/* 首屏 Hero 区：双栏（左侧技术价值，右侧在线公差与排单测算器） */
.hero-section {
  padding: 38px 0 48px;
  background: radial-gradient(circle at 75% 20%, rgba(245, 166, 35, 0.08) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 36px;
  align-items: center;
}

.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: rgba(0, 210, 180, 0.1);
  border: 1px solid rgba(0, 210, 180, 0.3);
  border-radius: 20px;
  color: var(--ddl-cyan);
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-h1 {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-h1 span.highlight {
  color: var(--ddl-gold);
}

.hero-desc {
  font-size: 15px;
  color: var(--ddl-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.hero-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.hero-feat-item {
  background: var(--ddl-bg-surface);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  padding: 12px 14px;
}

.hero-feat-val {
  font-size: 20px;
  font-weight: 800;
  color: var(--ddl-gold);
  font-family: var(--font-mono);
}

.hero-feat-lbl {
  font-size: 12px;
  color: var(--ddl-text-muted);
}

/* 上半屏核心交互工具：模切公差与排单选型计算器 (Traffic SEO Playbook 标配) */
.calc-card {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-lg);
  padding: 24px;
  box-shadow: var(--ddl-shadow);
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ddl-gold), var(--ddl-cyan));
}

.calc-header {
  margin-bottom: 18px;
}

.calc-title {
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.calc-subtitle {
  font-size: 12px;
  color: var(--ddl-text-muted);
  margin-top: 4px;
}

.calc-form-group {
  margin-bottom: 14px;
}

.calc-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ddl-text-secondary);
  margin-bottom: 6px;
}

.calc-input, .calc-select {
  width: 100%;
  background: var(--ddl-bg-canvas);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-sm);
  padding: 10px 12px;
  color: #ffffff;
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s ease;
}

.calc-input:focus, .calc-select:focus {
  border-color: var(--ddl-gold);
}

.calc-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-calc-submit {
  width: 100%;
  background: linear-gradient(135deg, var(--ddl-cyan), #009688);
  color: #0b0f17;
  font-weight: 800;
  font-size: 14px;
  padding: 12px;
  border-radius: var(--ddl-radius-sm);
  border: none;
  cursor: pointer;
  margin-top: 8px;
  box-shadow: 0 4px 15px var(--ddl-cyan-glow);
  transition: transform 0.15s ease;
}

.btn-calc-submit:hover {
  transform: translateY(-1px);
}

.calc-result-box {
  margin-top: 16px;
  padding: 14px;
  background: var(--ddl-bg-surface);
  border: 1px dashed var(--ddl-border);
  border-radius: var(--ddl-radius-sm);
  display: none;
}

.calc-result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  margin-bottom: 6px;
}

.calc-result-row:last-child {
  margin-bottom: 0;
}

.calc-res-highlight {
  font-weight: 700;
  color: var(--ddl-gold);
  font-family: var(--font-mono);
}

/* 栏目通用卡片与标题排版 */
.section-block {
  padding: 48px 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
}

.section-title {
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-desc {
  font-size: 14px;
  color: var(--ddl-text-muted);
  margin-top: 4px;
}

.view-all-link {
  font-size: 13px;
  color: var(--ddl-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.view-all-link:hover {
  text-decoration: underline;
}

/* 终端行业卡片网格 */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.industry-card {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.industry-card:hover {
  transform: translateY(-3px);
  border-color: var(--ddl-gold);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.industry-icon-wrap {
  width: 48px;
  height: 48px;
  background: var(--ddl-bg-surface);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.industry-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.industry-tag {
  font-size: 11px;
  color: var(--ddl-cyan);
  background: var(--ddl-cyan-glow);
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}

.industry-desc {
  font-size: 13px;
  color: var(--ddl-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.industry-parts-list {
  list-style: none;
  font-size: 12px;
  color: var(--ddl-text-muted);
  border-top: 1px solid var(--ddl-border-subtle);
  padding-top: 12px;
}

.industry-parts-list li {
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.industry-parts-list li::before {
  content: "•";
  color: var(--ddl-gold);
}

/* 严选模切工厂微官网卡片网格 */
.factory-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.factory-card {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  position: relative;
}

.factory-card:hover {
  border-color: var(--ddl-gold);
  box-shadow: var(--ddl-shadow-glow);
}

.factory-badge-verified {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 11px;
  font-weight: 700;
  color: var(--ddl-cyan);
  background: rgba(0, 210, 180, 0.1);
  border: 1px solid rgba(0, 210, 180, 0.3);
  padding: 2px 8px;
  border-radius: 4px;
}

.factory-header {
  margin-bottom: 14px;
  padding-right: 60px;
}

.factory-name {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.4;
}

.factory-meta {
  font-size: 12px;
  color: var(--ddl-gold);
  margin-top: 4px;
  font-family: var(--font-mono);
}

.factory-specs-table {
  width: 100%;
  font-size: 12px;
  border-collapse: collapse;
  margin-bottom: 14px;
  background: var(--ddl-bg-surface);
  border-radius: var(--ddl-radius-sm);
  overflow: hidden;
}

.factory-specs-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--ddl-border-subtle);
}

.factory-specs-table td.spec-lbl {
  color: var(--ddl-text-muted);
  width: 75px;
}

.factory-specs-table td.spec-val {
  color: var(--ddl-text-secondary);
}

.factory-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.factory-pill {
  font-size: 11px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--ddl-border);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--ddl-text-secondary);
}

.factory-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
}

.btn-factory-detail {
  flex: 1;
  text-align: center;
  font-size: 13px;
  padding: 8px 0;
  background: var(--ddl-bg-surface);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-sm);
  color: #ffffff;
}

.btn-factory-detail:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: #ffffff;
}

.btn-factory-rfq {
  flex: 1.2;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 0;
  background: linear-gradient(135deg, var(--ddl-gold), #b37400);
  color: #0b0f17;
  border-radius: var(--ddl-radius-sm);
  border: none;
  cursor: pointer;
}

/* 材料物性参数表组件 (SEO 极佳结构化数据) */
.material-table-card {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  overflow-x: auto;
  box-shadow: var(--ddl-shadow);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.data-table th {
  background: var(--ddl-bg-surface);
  padding: 12px 16px;
  color: var(--ddl-gold);
  font-weight: 700;
  border-bottom: 1px solid var(--ddl-border);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--ddl-border-subtle);
  color: var(--ddl-text-secondary);
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
  color: #ffffff;
}

.table-brand-tag {
  font-size: 11px;
  color: var(--ddl-cyan);
  background: var(--ddl-cyan-glow);
  padding: 1px 6px;
  border-radius: 3px;
  display: inline-block;
  margin-top: 3px;
}

/* 下半屏 SEO 引擎与 FAQ 折叠模块 */
.seo-engine-section {
  background: var(--ddl-bg-surface);
  border-top: 1px solid var(--ddl-border);
  border-bottom: 1px solid var(--ddl-border);
  padding: 56px 0;
  margin-top: 40px;
}

.seo-prose {
  max-width: 900px;
  margin: 0 auto;
}

.seo-prose h2 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--ddl-gold);
}

.seo-prose p {
  font-size: 14px;
  color: var(--ddl-text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
}

.faq-list {
  margin-top: 24px;
}

.faq-item {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question:hover {
  color: var(--ddl-gold);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--ddl-text-secondary);
  line-height: 1.7;
}

/* 底部全网矩阵索引 */
.site-footer {
  background: var(--ddl-bg-deep);
  border-top: 1px solid var(--ddl-border);
  padding: 48px 0 28px;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--ddl-text-muted);
}

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

.footer-bottom {
  border-top: 1px solid var(--ddl-border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ddl-text-muted);
  font-size: 12px;
}

/* 在线 CAD 打样与图纸询盘模态弹窗 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-dialog {
  background: var(--ddl-bg-card);
  border: 1px solid var(--ddl-border);
  border-radius: var(--ddl-radius-lg);
  max-width: 580px;
  width: 100%;
  padding: 32px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 20px;
  color: var(--ddl-text-muted);
  cursor: pointer;
  background: none;
  border: none;
}

.modal-close:hover {
  color: #ffffff;
}

.modal-title {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 8px;
}

.modal-subtitle {
  font-size: 13px;
  color: var(--ddl-text-muted);
  margin-bottom: 22px;
}

/* 移动端响应式适配 */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .industry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .factory-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .main-nav {
    display: none;
  }
}

@media (max-width: 600px) {
  .industry-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}