/* ============================================================
   沧州中创环保 - Design System v3.8
   配色：专业深蓝 #2d3f5c / 环保绿 #059669 / 活力橙 #e8650a
   优化：更有工业力量感，视觉层级更清晰
   ============================================================ */

:root {
  /* 主色 - 专业深蓝（替代原冷调青蓝，更有工业厚重感） */
  --c-primary: #2d4a6e;
  --c-primary-dark: #2d3f5c;
  --c-primary-2: #4a6fa5;
  --c-primary-light: #b0c4de;

  /* 辅色 - 环保绿（保持专业绿） */
  --c-accent: #059669;
  --c-accent-dark: #047857;
  --c-accent-light: #6ee7b7;

  /* 点缀色 - 活力橙（更现代有活力） */
  --c-orange: #e8650a;
  --c-orange-light: #ea6a0a;
  --c-green: #fbbf24;

  /* 背景 */
  --c-bg-soft: #f5f7fa;
  --c-bg-white: #ffffff;
  --c-bg-section: #fafbff;

  /* 文字（更深的对比色） */
  --c-text-1: #2d3f5c;
  --c-text-2: #1e293b;
  --c-text-3: #64748b;

  /* 深色背景（Hero/CTA深色块）——更深邃有力 */
  --hero-bg: #1a2332;
  --hero-bg2: #1e2738;
  --hero-bg3: #1e3a5f;

  /* 中性 */
  --white: #ffffff;
  --shadow-sm: 0 2px 8px rgba(30, 64, 175, 0.08);
  --shadow: 0 4px 20px rgba(30, 64, 175, 0.12);
  --shadow-lg: 0 8px 40px rgba(30, 64, 175, 0.18);
  --shadow-orange: 0 4px 20px rgba(249, 115, 22, 0.35);

  /* 圆角 */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-8: 64px;

  /* 字体 */
  --font: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
  --font-mono: 'Consolas', 'Monaco', monospace;

  /* 字号 */
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 15px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 36px;
  --fs-4xl: 48px;

  /* 渐变（更有视觉冲击） */
  --grad-primary: linear-gradient(135deg, #2d4a6e, #4a6fa5);
  --grad-orange: linear-gradient(135deg, #e8650a, #ea6a0a);
  --grad-green: linear-gradient(135deg, #059669, #34d399);
  --grad-hero: linear-gradient(135deg, #1a2332 0%, #1e2738 40%, #1e3a5f 70%, #1a2332 100%);
  --grad-card: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(5, 150, 105, 0.04));
  --grad-text: linear-gradient(135deg, #2d4a6e, #059669);
}

/* ===== Reset ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

html, body {
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--c-text-2);
  background: var(--c-bg-white);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-primary); text-decoration: none; transition: all 0.25s; }
a:hover { color: var(--c-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; }

/* ===== Header ===== */
.ds-header {
  background: rgba(15, 23, 42, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(30, 64, 175, 0.2);
  padding: 15px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.ds-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.ds-logo {
  color: var(--white);
  font-size: var(--fs-lg);
  font-weight: 700;
  text-decoration: none;
  line-height: 1.2;
}
.ds-logo small {
  display: block;
  font-size: var(--fs-xs);
  color: var(--c-primary-2);
  font-weight: 400;
  margin-top: 2px;
}
.ds-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.ds-nav a {
  color: rgba(255, 255, 255, 0.75);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  text-decoration: none;
  transition: all 0.25s;
  position: relative;
}
.ds-nav a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--c-primary-2);
  border-radius: 2px;
  transition: width 0.25s;
}
.ds-nav a:hover, .ds-nav a.active {
  color: var(--c-primary-2);
  background: rgba(59, 130, 246, 0.1);
}
.ds-nav a:hover::after, .ds-nav a.active::after { width: 60%; }
.ds-phone {
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: var(--c-primary-2);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: var(--fs-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.25s;
}
.ds-phone:hover {
  background: rgba(59, 130, 246, 0.2);
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
  color: var(--c-primary-2);
}

/* ===== Container ===== */
.ds-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.ds-container-narrow { max-width: 900px; margin: 0 auto; padding: 0 20px; }

/* ===== Breadcrumb ===== */
.ds-breadcrumb {
  max-width: 1200px;
  margin: 20px auto 0;
  padding: 0 20px;
  font-size: var(--fs-sm);
  color: var(--c-text-3);
}
.ds-breadcrumb a { color: var(--c-primary); text-decoration: none; }
.ds-breadcrumb span.sep { margin: 0 8px; opacity: 0.5; }
.ds-breadcrumb .current { color: var(--c-text-2); }

/* ===== Hero ===== */
.ds-hero {
  text-align: center;
  padding: var(--space-6) 20px var(--space-5);
}
.ds-hero h1 {
  font-size: var(--fs-3xl);
  font-weight: 800;
  margin-bottom: var(--space-3);
  line-height: 1.2;
  color: var(--c-text-1);
}
.ds-hero h1 em { color: var(--c-primary); font-style: normal; }
.ds-hero p {
  font-size: var(--fs-base);
  color: var(--c-text-3);
  max-width: 700px;
  margin: 0 auto;
}

/* ===== Section ===== */
.ds-section { padding: var(--space-6) 0; }
.ds-section h2 {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-left: var(--space-3);
  border-left: 4px solid var(--c-primary);
  color: var(--c-text-1);
  position: relative;
}
.ds-section h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background: var(--grad-primary);
  margin-top: var(--space-2);
}

/* ===== Card ===== */
.ds-card {
  background: var(--c-bg-white);
  border: 1px solid rgba(30, 64, 175, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  box-shadow: var(--shadow-sm);
}
.ds-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(30, 64, 175, 0.25);
}
.ds-card h3 {
  font-size: var(--fs-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--c-text-1);
}
.ds-card p { color: var(--c-text-3); font-size: var(--fs-sm); line-height: 1.7; }

/* ===== Grid ===== */
.ds-grid { display: grid; gap: var(--space-3); }
.ds-grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.ds-grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.ds-grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ===== Buttons ===== */
.ds-btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: var(--fs-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s;
  border: none;
  font-family: inherit;
}
.ds-btn-primary {
  background: var(--grad-primary);
  color: var(--white);
  box-shadow: var(--shadow);
}
.ds-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(30, 64, 175, 0.4);
  color: var(--white);
}
.ds-btn-orange {
  background: var(--grad-orange);
  color: var(--white);
  box-shadow: var(--shadow-orange);
}
.ds-btn-orange:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(249, 115, 22, 0.5);
  color: var(--white);
}
.ds-btn-outline {
  background: transparent;
  border: 2px solid var(--c-primary);
  color: var(--c-primary);
}
.ds-btn-outline:hover {
  background: rgba(30, 64, 175, 0.08);
  opacity: 1;
}

/* ===== Tables ===== */
.ds-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(30, 64, 175, 0.1);
}
.ds-table th, .ds-table td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid rgba(30, 64, 175, 0.08);
}
.ds-table th {
  background: rgba(30, 64, 175, 0.08);
  color: var(--c-primary);
  font-weight: 600;
  font-size: var(--fs-sm);
}
.ds-table td { color: var(--c-text-2); font-size: var(--fs-sm); }
.ds-table tr:hover td { background: rgba(30, 64, 175, 0.04); }
.ds-table .highlight td {
  background: rgba(249, 115, 22, 0.08);
  color: var(--c-orange);
  font-weight: 600;
}

/* ===== Forms ===== */
.ds-form { display: grid; gap: var(--space-3); }
.ds-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.ds-input, .ds-textarea, .ds-select {
  width: 100%;
  padding: 10px 14px;
  background: rgba(30, 64, 175, 0.04);
  border: 1px solid rgba(30, 64, 175, 0.2);
  border-radius: var(--radius-sm);
  color: var(--c-text-2);
  font-size: var(--fs-sm);
  font-family: inherit;
  transition: all 0.25s;
}
.ds-input:focus, .ds-textarea:focus, .ds-select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.12);
  background: rgba(30, 64, 175, 0.06);
}
.ds-input.error, .ds-textarea.error {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}
.ds-input.success, .ds-textarea.success {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.1);
}
.ds-textarea { min-height: 100px; resize: vertical; }
.ds-form label { display: block; font-size: var(--fs-xs); color: var(--c-text-3); margin-bottom: var(--space-1); }
.ds-error { font-size: var(--fs-xs); color: #ef4444; margin-top: 4px; }

/* ===== CTA Box ===== */
.ds-cta {
  background: var(--grad-card);
  border: 2px solid rgba(30, 64, 175, 0.18);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  margin: var(--space-5) 0;
}
.ds-cta h3 { color: var(--c-primary); font-size: var(--fs-xl); margin-bottom: var(--space-3); }
.ds-cta p { color: var(--c-text-3); margin-bottom: var(--space-4); }

/* ===== Stats Bar ===== */
.ds-stats {
  background: var(--c-bg-white);
  border: 1px solid rgba(30, 64, 175, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  text-align: center;
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-sm);
}
.ds-stat-num {
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1;
}
.ds-stat-label { font-size: var(--fs-xs); color: var(--c-text-3); margin-top: var(--space-2); }

/* ===== Tag/Pill ===== */
.ds-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(30, 64, 175, 0.1);
  color: var(--c-primary);
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: 600;
}
.ds-tag-success { background: rgba(5, 150, 105, 0.1); color: var(--c-accent-dark); }
.ds-tag-orange { background: rgba(249, 115, 22, 0.1); color: var(--c-orange); }

/* ===== Callout ===== */
.ds-callout {
  background: rgba(30, 64, 175, 0.05);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  color: var(--c-text-2);
}
.ds-callout strong { color: var(--c-primary); }

/* ===== FAQ ===== */
.ds-faq { max-width: 800px; margin: 0 auto; display: grid; gap: var(--space-2); }
.ds-faq-item {
  background: var(--c-bg-white);
  border: 1px solid rgba(30, 64, 175, 0.1);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s;
}
.ds-faq-item:hover { border-color: rgba(30, 64, 175, 0.3); box-shadow: var(--shadow-sm); }
.ds-faq-q {
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--c-text-1);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  user-select: none;
}
.ds-faq-q::after {
  content: '+';
  font-size: 20px;
  color: var(--c-primary);
  transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
  flex-shrink: 0;
  font-weight: 400;
}
.ds-faq-item.open .ds-faq-q::after { transform: rotate(45deg); }
.ds-faq-a {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.3s ease;
  padding: 0 var(--space-4);
  font-size: var(--fs-sm);
  color: var(--c-text-2);
  line-height: 1.8;
  border-top: 1px solid transparent;
}
.ds-faq-item.open .ds-faq-a {
  max-height: 400px;
  opacity: 1;
  padding: var(--space-3) var(--space-4);
  border-top-color: rgba(30, 64, 175, 0.1);
}

/* ===== Process Flow ===== */
.ds-process {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  margin: var(--space-5) 0;
}
.ds-process-node {
  text-align: center;
  padding: var(--space-3) var(--space-4);
  position: relative;
}
.ds-process-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-2);
  font-size: 28px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
}
.ds-process-node:hover .ds-process-icon {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}
.ds-process-label { font-size: var(--fs-sm); font-weight: 700; color: var(--c-text-1); }
.ds-process-sub { font-size: var(--fs-xs); color: var(--c-text-3); margin-top: 4px; }
.ds-process-arrow {
  color: var(--c-primary-2);
  font-size: 24px;
  flex-shrink: 0;
  animation: ds-arrowPulse 1.5s ease-in-out infinite;
}
@keyframes ds-arrowPulse {
  0%, 100% { opacity: 0.4; transform: translateX(0); }
  50% { opacity: 1; transform: translateX(4px); }
}

/* ===== Floating Contact Bar ===== */
.fab-container {
  position: fixed;
  right: 20px;
  bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
}
.fab-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  border: none;
  transition: all 0.3s;
  position: relative;
  box-shadow: var(--shadow);
}
.fab-btn:hover { transform: scale(1.1) translateY(-2px); box-shadow: var(--shadow-lg); }
.fab-wechat { background: var(--grad-green); color: white; }
.fab-qq { background: var(--grad-primary); color: white; }
.fab-phone { background: var(--grad-orange); color: white; }
.fab-top {
  background: var(--c-bg-white);
  color: var(--c-primary);
  border: 1px solid rgba(30, 64, 175, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.fab-top.visible { opacity: 1; pointer-events: auto; }
.fab-phone::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--c-orange);
  animation: fab-pulse 2.5s ease-out infinite;
  pointer-events: none;
}
@keyframes fab-pulse {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.5); opacity: 0; }
}
.fab-popup {
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%) scale(0.9);
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 12px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
}
.fab-btn:hover .fab-popup {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  pointer-events: auto;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.reveal-scale.visible { opacity: 1; transform: scale(1); }

/* ===== Counter Animation ===== */
.counter-num {
  font-variant-numeric: tabular-nums;
  display: inline-block;
}

/* ===== 3D Tilt Card ===== */
.tilt-card {
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out;
  will-change: transform;
}

/* ===== Loading Skeleton ===== */
@keyframes skeleton-shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.skeleton {
  background: linear-gradient(90deg, rgba(30,64,175,0.06) 25%, rgba(30,64,175,0.12) 50%, rgba(30,64,175,0.06) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* ===== Cursor Blink ===== */
@keyframes cursor-blink {
  0%, 100% { border-color: var(--c-primary-2); }
  50% { border-color: transparent; }
}
.cursor { border-right: 2px solid var(--c-primary-2); animation: cursor-blink 0.8s step-end infinite; padding-right: 2px; }

/* ===== Scroll Progress Ring ===== */
.scroll-progress-ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 9999;
  background: rgba(30, 64, 175, 0.1);
}
.scroll-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  width: 0%;
  transition: width 0.1s linear;
}

/* ===== Footer ===== */
.ds-footer {
  background: #1a2332;
  padding: var(--space-5) 20px;
  text-align: center;
  color: rgba(255, 255, 255, 0.45);
  font-size: var(--fs-xs);
  border-top: 1px solid rgba(30, 64, 175, 0.2);
  margin-top: var(--space-8);
}
.ds-footer a { color: rgba(255, 255, 255, 0.65); text-decoration: none; margin: 0 8px; transition: color 0.2s; }
.ds-footer a:hover { color: var(--c-primary-2); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .ds-nav { display: none; }
  .ds-hero h1 { font-size: var(--fs-xl); }
  .ds-form-row { grid-template-columns: 1fr; }
  .ds-section h2 { font-size: var(--fs-lg); }
  .ds-stats { grid-template-columns: repeat(2, 1fr); }
  .ds-process { flex-direction: column; }
  .ds-process-arrow { transform: rotate(90deg); }
}

/* ===== Print ===== */
@media print {
  .ds-header, .ds-footer, .fab-container, .scroll-progress-ring { display: none; }
  body { background: white; color: black; }
}