/* ================================

   萨震节能空压机 - 售后服务网站

   全局样式表

   ================================ */



/* ===== CSS Variables ===== */

:root {

  /* Brand Colors */

  --color-primary: #0a2540;

  --color-primary-light: #1a3a5c;

  --color-primary-dark: #061a2e;

  --color-accent: #ff6b35;

  --color-accent-light: #ff8555;

  --color-accent-dark: #e55320;

  --color-teal: #00a8a8;

  --color-teal-light: #2ec4b4;

  --color-success: #2ecc71;

  --color-warning: #f39c12;

  --color-danger: #e74c3c;



  /* Neutral Colors */

  --color-bg: #f7f9fc;

  --color-bg-alt: #eef2f7;

  --color-white: #ffffff;

  --color-text: #1a1a2e;

  --color-text-secondary: #5a6c7d;

  --color-text-muted: #8898aa;

  --color-border: #e1e8ed;

  --color-border-light: #f0f4f8;



  /* Typography */

  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;



  /* Spacing */

  --space-xs: 0.25rem;

  --space-sm: 0.5rem;

  --space-md: 1rem;

  --space-lg: 1.5rem;

  --space-xl: 2rem;

  --space-2xl: 3rem;

  --space-3xl: 4rem;

  --space-4xl: 6rem;



  /* Border Radius */

  --radius-sm: 6px;

  --radius-md: 10px;

  --radius-lg: 16px;

  --radius-xl: 24px;

  --radius-full: 9999px;



  /* Shadows */

  --shadow-sm: 0 1px 3px rgba(10, 37, 64, 0.08);

  --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.1);

  --shadow-lg: 0 10px 30px rgba(10, 37, 64, 0.12);

  --shadow-xl: 0 20px 50px rgba(10, 37, 64, 0.15);

  --shadow-accent: 0 8px 24px rgba(255, 107, 53, 0.3);



  /* Transitions */

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);

  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);



  /* Layout */

  --container-max: 1200px;

  --header-height: 72px;

  --z-header: 1000;

  --z-overlay: 2000;

  --z-modal: 3000;

}



/* ===== Reset & Base ===== */

*,

*::before,

*::after {

  margin: 0;

  padding: 0;

  box-sizing: border-box;

}



html {

  font-size: 16px;

  scroll-behavior: smooth;

  -webkit-text-size-adjust: 100%;

}



body {

  font-family: var(--font-sans);

  color: var(--color-text);

  background: var(--color-bg);

  line-height: 1.6;

  -webkit-font-smoothing: antialiased;

  -moz-osx-font-smoothing: grayscale;

  overflow-x: hidden;

}



img,

svg {

  max-width: 100%;

  height: auto;

  display: block;

}



a {

  color: inherit;

  text-decoration: none;

  transition: color var(--transition-fast);

}



ul,

ol {

  list-style: none;

}



button {

  font-family: inherit;

  cursor: pointer;

  border: none;

  background: none;

}



input,

textarea,

select {

  font-family: inherit;

  font-size: inherit;

}



/* ===== Container ===== */

.container {

  width: 100%;

  max-width: var(--container-max);

  margin: 0 auto;

  padding: 0 var(--space-xl);

}



@media (max-width: 768px) {

  .container {

    padding: 0 var(--space-lg);

  }

}



/* ===== Typography ===== */

.section-title {

  font-size: 2.25rem;

  font-weight: 800;

  color: var(--color-primary);

  letter-spacing: -0.02em;

  line-height: 1.2;

}



.section-subtitle {

  font-size: 1.125rem;

  color: var(--color-text-secondary);

  margin-top: var(--space-md);

  max-width: 600px;

}







.text-center {

  text-align: center;

}



.text-center .section-subtitle {

  margin-left: auto;

  margin-right: auto;

}



@media (max-width: 768px) {

  .section-title {

    font-size: 1.75rem;

  }

}



/* ===== Buttons ===== */

.btn {

  display: inline-flex;

  align-items: center;

  justify-content: center;

  gap: var(--space-sm);

  padding: 0.875rem 1.75rem;

  font-size: 0.9375rem;

  font-weight: 600;

  border-radius: var(--radius-md);

  transition: all var(--transition-base);

  white-space: nowrap;

  cursor: pointer;

  border: 2px solid transparent;

}



.btn-primary {

  background: var(--color-accent);

  color: var(--color-white);

  box-shadow: var(--shadow-accent);

}



.btn-primary:hover {

  background: var(--color-accent-dark);

  transform: translateY(-2px);

  box-shadow: 0 12px 28px rgba(255, 107, 53, 0.4);

}



.btn-secondary {

  background: var(--color-primary);

  color: var(--color-white);

}



.btn-secondary:hover {

  background: var(--color-primary-light);

  transform: translateY(-2px);

}



.btn-outline {

  background: transparent;

  border-color: var(--color-border);

  color: var(--color-primary);

}



.btn-outline:hover {

  border-color: var(--color-accent);

  color: var(--color-accent);

  background: rgba(255, 107, 53, 0.05);

}



.btn-ghost {

  background: transparent;

  color: var(--color-white);

  border-color: rgba(255, 255, 255, 0.3);

}



.btn-ghost:hover {

  background: rgba(255, 255, 255, 0.1);

  border-color: rgba(255, 255, 255, 0.6);

}



.btn-lg {

  padding: 1.125rem 2.25rem;

  font-size: 1rem;

}



.btn-block {

  display: flex;

  width: 100%;

}



/* ===== Page Hero (inner pages) ===== */

.page-hero {

  padding: calc(var(--header-height) + var(--space-4xl)) 0 var(--space-3xl);

  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);

  color: var(--color-white);

  position: relative;

  overflow: hidden;

}



.page-hero::before {

  content: "";

  position: absolute;

  top: -50%;

  right: -10%;

  width: 500px;

  height: 500px;

  background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);

  border-radius: 50%;

}



.page-hero::after {

  content: "";

  position: absolute;

  bottom: -30%;

  left: -5%;

  width: 400px;

  height: 400px;

  background: radial-gradient(circle, rgba(0, 168, 168, 0.12) 0%, transparent 70%);

  border-radius: 50%;

}



.page-hero .container {

  position: relative;

  z-index: 1;

}



.breadcrumb {

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  font-size: 0.875rem;

  color: rgba(255, 255, 255, 0.6);

  margin-bottom: var(--space-lg);

}



.breadcrumb a:hover {

  color: var(--color-white);

}



.breadcrumb span {

  color: rgba(255, 255, 255, 0.4);

}



.page-hero h1 {

  font-size: 2.75rem;

  font-weight: 800;

  letter-spacing: -0.02em;

  line-height: 1.15;

}



.page-hero p {

  font-size: 1.125rem;

  color: rgba(255, 255, 255, 0.75);

  margin-top: var(--space-md);

  max-width: 600px;

}



@media (max-width: 768px) {

  .page-hero {

    padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-2xl);

  }



  .page-hero h1 {

    font-size: 2rem;

  }



  .page-hero p {

    font-size: 1rem;

  }

}



/* ===== Sections ===== */

.section {

  padding: var(--space-4xl) 0;

}



.section-sm {

  padding: var(--space-3xl) 0;

}



.section-bg-alt {

  background: var(--color-bg-alt);

}



.section-bg-dark {

  background: var(--color-primary);

  color: var(--color-white);

}



.section-header {

  margin-bottom: var(--space-3xl);

}



/* ===== Cards ===== */

.card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-2xl);

  box-shadow: var(--shadow-sm);

  border: 1px solid var(--color-border-light);

  transition: all var(--transition-base);

}



.card:hover {

  box-shadow: var(--shadow-lg);

  transform: translateY(-4px);

  border-color: var(--color-border);

}



.card-icon {

  width: 56px;

  height: 56px;

  border-radius: var(--radius-md);

  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(255, 107, 53, 0.05));

  display: flex;

  align-items: center;

  justify-content: center;

  margin-bottom: var(--space-lg);

  color: var(--color-accent);

}



.card-icon svg {

  width: 28px;

  height: 28px;

}



.card-icon.teal {

  background: linear-gradient(135deg, rgba(0, 168, 168, 0.1), rgba(0, 168, 168, 0.05));

  color: var(--color-teal);

}



.card-icon.primary {

  background: linear-gradient(135deg, rgba(10, 37, 64, 0.1), rgba(10, 37, 64, 0.05));

  color: var(--color-primary);

}



.card h3 {

  font-size: 1.25rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-sm);

}



.card p {

  color: var(--color-text-secondary);

  font-size: 0.9375rem;

  line-height: 1.7;

}



/* ===== Grid System ===== */

.grid {

  display: grid;

  gap: var(--space-xl);

}



.grid-2 {

  grid-template-columns: repeat(2, 1fr);

}



.grid-3 {

  grid-template-columns: repeat(3, 1fr);

}



.grid-4 {

  grid-template-columns: repeat(4, 1fr);

}



@media (max-width: 992px) {

  .grid-4 {

    grid-template-columns: repeat(2, 1fr);

  }



  .grid-3 {

    grid-template-columns: repeat(2, 1fr);

  }

}



@media (max-width: 640px) {

  .grid-4,

  .grid-3,

  .grid-2 {

    grid-template-columns: 1fr;

  }

}



/* ===== Stats ===== */

.stats-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-xl);

}



.stat-item {

  text-align: center;

}



.stat-number {

  font-size: 3rem;

  font-weight: 800;

  color: var(--color-accent);

  line-height: 1;

  letter-spacing: -0.03em;

}



.stat-number .unit {

  font-size: 1.5rem;

  color: var(--color-text-secondary);

}



.stat-label {

  font-size: 0.9375rem;

  color: var(--color-text-secondary);

  margin-top: var(--space-sm);

}



@media (max-width: 768px) {

  .stats-grid {

    grid-template-columns: repeat(2, 1fr);

    gap: var(--space-xl);

  }



  .stat-number {

    font-size: 2.25rem;

  }

}



/* ===== Process Steps ===== */

.process-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-xl);

  position: relative;

}



.process-grid::before {

  content: "";

  position: absolute;

  top: 32px;

  left: 12%;

  right: 12%;

  height: 2px;

  background: repeating-linear-gradient(

    90deg,

    var(--color-border) 0,

    var(--color-border) 8px,

    transparent 8px,

    transparent 16px

  );

}



.process-step {

  text-align: center;

  position: relative;

  z-index: 1;

}



.step-number {

  width: 64px;

  height: 64px;

  border-radius: 50%;

  background: var(--color-white);

  border: 2px solid var(--color-border);

  display: flex;

  align-items: center;

  justify-content: center;

  font-size: 1.5rem;

  font-weight: 800;

  color: var(--color-primary);

  margin: 0 auto var(--space-lg);

  transition: all var(--transition-base);

}



.process-step:hover .step-number {

  background: var(--color-accent);

  border-color: var(--color-accent);

  color: var(--color-white);

  transform: scale(1.05);

}



.process-step h4 {

  font-size: 1.125rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-sm);

}



.process-step p {

  font-size: 0.875rem;

  color: var(--color-text-secondary);

}



@media (max-width: 768px) {

  .process-grid {

    grid-template-columns: 1fr;

    gap: var(--space-2xl);

  }



  .process-grid::before {

    display: none;

  }

}



/* ===== Forms ===== */

.form-group {

  margin-bottom: var(--space-lg);

}



.form-label {

  display: block;

  font-size: 0.875rem;

  font-weight: 600;

  color: var(--color-text);

  margin-bottom: var(--space-sm);

}



.form-label .required {

  color: var(--color-danger);

}



.form-control {

  width: 100%;

  padding: 0.75rem 1rem;

  font-size: 0.9375rem;

  color: var(--color-text);

  background: var(--color-white);

  border: 1.5px solid var(--color-border);

  border-radius: var(--radius-md);

  transition: all var(--transition-fast);

  outline: none;

}



.form-control:focus {

  border-color: var(--color-accent);

  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.12);

}



.form-control::placeholder {

  color: var(--color-text-muted);

}



textarea.form-control {

  min-height: 120px;

  resize: vertical;

}



select.form-control {

  cursor: pointer;

  appearance: none;

  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%235a6c7d' stroke-width='2'%3E%3Cpath d='M3 5l3 3 3-3'/%3E%3C/svg%3E");

  background-repeat: no-repeat;

  background-position: right 1rem center;

  padding-right: 2.5rem;

}



.form-row {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-lg);

}



.form-hint {

  font-size: 0.8125rem;

  color: var(--color-text-muted);

  margin-top: var(--space-xs);

}



.form-error {

  font-size: 0.8125rem;

  color: var(--color-danger);

  margin-top: var(--space-xs);

  display: none;

}



.form-control.error {

  border-color: var(--color-danger);

}



.form-control.error + .form-error {

  display: block;

}



@media (max-width: 640px) {

  .form-row {

    grid-template-columns: 1fr;

  }

}



/* ===== FAQ Accordion ===== */

.faq-item {

  border: 1px solid var(--color-border);

  border-radius: var(--radius-md);

  margin-bottom: var(--space-md);

  overflow: hidden;

  transition: all var(--transition-fast);

  background: var(--color-white);

}



.faq-item.active {

  border-color: var(--color-accent);

  box-shadow: var(--shadow-sm);

}



.faq-question {

  padding: var(--space-lg) var(--space-xl);

  font-size: 1rem;

  font-weight: 600;

  color: var(--color-primary);

  cursor: pointer;

  display: flex;

  align-items: center;

  justify-content: space-between;

  gap: var(--space-md);

  transition: color var(--transition-fast);

}



.faq-question:hover {

  color: var(--color-accent);

}



.faq-toggle {

  width: 24px;

  height: 24px;

  display: flex;

  align-items: center;

  justify-content: center;

  flex-shrink: 0;

  color: var(--color-text-muted);

  transition: transform var(--transition-base);

}



.faq-item.active .faq-toggle {

  transform: rotate(45deg);

  color: var(--color-accent);

}



.faq-answer {

  max-height: 0;

  overflow: hidden;

  transition: max-height var(--transition-base), padding var(--transition-base);

  padding: 0 var(--space-xl);

  color: var(--color-text-secondary);

  font-size: 0.9375rem;

  line-height: 1.7;

}



.faq-item.active .faq-answer {

  max-height: 300px;

  padding: 0 var(--space-xl) var(--space-lg);

}



/* ===== Utility ===== */

.text-accent { color: var(--color-accent); }

.text-teal { color: var(--color-teal); }

.text-muted { color: var(--color-text-muted); }

.mt-0 { margin-top: 0; }

.mt-md { margin-top: var(--space-md); }

.mt-lg { margin-top: var(--space-lg); }

.mt-xl { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }

.mb-md { margin-bottom: var(--space-md); }

.mb-lg { margin-bottom: var(--space-lg); }



/* ===== Animations ===== */

@keyframes fadeInUp {

  from {

    opacity: 0;

    transform: translateY(24px);

  }

  to {

    opacity: 1;

    transform: translateY(0);

  }

}



@keyframes fadeIn {

  from { opacity: 0; }

  to { opacity: 1; }

}



@keyframes float {

  0%, 100% { transform: translateY(0); }

  50% { transform: translateY(-10px); }

}



@keyframes pulse {

  0%, 100% { opacity: 1; }

  50% { opacity: 0.6; }

}



.animate-in {

  opacity: 0;

  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;

}



.delay-1 { animation-delay: 0.1s; }

.delay-2 { animation-delay: 0.2s; }

.delay-3 { animation-delay: 0.3s; }

.delay-4 { animation-delay: 0.4s; }

.delay-5 { animation-delay: 0.5s; }



/* Scroll reveal */

.js .reveal {

  opacity: 0;

  transform: translateY(30px);

  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);

}



.reveal.visible {

  opacity: 1;

  transform: translateY(0);

}



/* ===== Toast ===== */

.toast {

  position: fixed;

  bottom: var(--space-2xl);

  left: 50%;

  transform: translateX(-50%) translateY(100px);

  background: var(--color-primary);

  color: var(--color-white);

  padding: var(--space-md) var(--space-xl);

  border-radius: var(--radius-md);

  box-shadow: var(--shadow-lg);

  font-size: 0.9375rem;

  font-weight: 500;

  z-index: var(--z-modal);

  opacity: 0;

  transition: all var(--transition-base);

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  max-width: 90vw;

}



.toast.show {

  transform: translateX(-50%) translateY(0);

  opacity: 1;

}



.toast.success {

  background: var(--color-success);

}



.toast.error {

  background: var(--color-danger);

}



/* ===== Badge ===== */

.badge {

  display: inline-flex;

  align-items: center;

  gap: var(--space-xs);

  padding: 0.25rem 0.625rem;

  font-size: 0.75rem;

  font-weight: 600;

  border-radius: var(--radius-full);

  background: rgba(0, 168, 168, 0.1);

  color: var(--color-teal);

}



.badge-accent {

  background: rgba(255, 107, 53, 0.1);

  color: var(--color-accent);

}



.badge-success {

  background: rgba(46, 204, 113, 0.1);

  color: var(--color-success);

}



/* ===== CTA Section ===== */

.cta-section {

  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));

  color: var(--color-white);

  padding: var(--space-4xl) 0;

  position: relative;

  overflow: hidden;

}



.cta-section::before {

  content: "";

  position: absolute;

  top: 0;

  right: 0;

  width: 600px;

  height: 100%;

  background: radial-gradient(ellipse at right, rgba(255, 107, 53, 0.15) 0%, transparent 60%);

}



.cta-section .container {

  position: relative;

  z-index: 1;

}



.cta-content {

  display: flex;

  align-items: center;

  justify-content: space-between;

  gap: var(--space-2xl);

}



.cta-content h2 {

  font-size: 2rem;

  font-weight: 800;

  letter-spacing: -0.02em;

  margin-bottom: var(--space-sm);

}



.cta-content p {

  color: rgba(255, 255, 255, 0.7);

  font-size: 1.0625rem;

}



@media (max-width: 768px) {

  .cta-content {

    flex-direction: column;

    text-align: center;

  }



  .cta-content h2 {

    font-size: 1.5rem;

  }

}



/* ===== Hero Section (Homepage) ===== */

.hero {

  min-height: 100vh;

  display: flex;

  align-items: center;

  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);

  color: var(--color-white);

  position: relative;

  overflow: hidden;

  padding-top: var(--header-height);

}



.hero-bg {

  position: absolute;

  inset: 0;

  z-index: 0;

}



.hero-grid {

  position: absolute;

  inset: 0;

  background-image:

    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),

    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);

  background-size: 60px 60px;

  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);

  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);

}



.hero::before {

  content: "";

  position: absolute;

  top: -20%;

  right: -10%;

  width: 600px;

  height: 600px;

  background: radial-gradient(circle, rgba(255, 107, 53, 0.12) 0%, transparent 70%);

  border-radius: 50%;

  z-index: 0;

}



.hero::after {

  content: "";

  position: absolute;

  bottom: -20%;

  left: -10%;

  width: 500px;

  height: 500px;

  background: radial-gradient(circle, rgba(0, 168, 168, 0.1) 0%, transparent 70%);

  border-radius: 50%;

  z-index: 0;

}



.hero-content {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-3xl);

  align-items: center;

  position: relative;

  z-index: 1;

  padding: var(--space-4xl) var(--space-xl);

}



.hero-badge {

  display: inline-flex;

  align-items: center;

  gap: var(--space-sm);

  padding: 0.375rem 0.875rem;

  background: rgba(46, 204, 113, 0.15);

  border: 1px solid rgba(46, 204, 113, 0.3);

  border-radius: var(--radius-full);

  font-size: 0.8125rem;

  font-weight: 600;

  color: #2ecc71;

  margin-bottom: var(--space-lg);

}



.pulse-dot {

  width: 8px;

  height: 8px;

  background: #2ecc71;

  border-radius: 50%;

  animation: pulse 2s infinite;

}



.hero h1 {

  font-size: 3.5rem;

  font-weight: 800;

  letter-spacing: -0.03em;

  line-height: 1.1;

  margin-bottom: var(--space-lg);

}



.hero-desc {

  font-size: 1.125rem;

  color: rgba(255, 255, 255, 0.7);

  line-height: 1.7;

  max-width: 520px;

  margin-bottom: var(--space-xl);

}



.hero-actions {

  display: flex;

  gap: var(--space-md);

  margin-bottom: var(--space-2xl);

  flex-wrap: wrap;

}



.hero-stats {

  display: flex;

  gap: var(--space-2xl);

  padding-top: var(--space-xl);

  border-top: 1px solid rgba(255, 255, 255, 0.1);

}



.hero-stat-num {

  font-size: 2.25rem;

  font-weight: 800;

  color: var(--color-white);

  letter-spacing: -0.02em;

  line-height: 1;

}



.hero-stat-num .unit {

  font-size: 1rem;

  color: rgba(255, 255, 255, 0.5);

  font-weight: 500;

}



.hero-stat-label {

  font-size: 0.8125rem;

  color: rgba(255, 255, 255, 0.5);

  margin-top: var(--space-xs);

}



.hero-visual {

  position: relative;

  display: flex;

  align-items: center;

  justify-content: center;

  min-height: 400px;

}



.hero-main-visual {

  width: 100%;

  max-width: 420px;

  animation: float 6s ease-in-out infinite;

}



.hero-card-float {

  position: absolute;

  background: rgba(255, 255, 255, 0.95);

  backdrop-filter: blur(12px);

  border-radius: var(--radius-md);

  padding: var(--space-md) var(--space-lg);

  display: flex;

  align-items: center;

  gap: var(--space-md);

  box-shadow: var(--shadow-lg);

  z-index: 2;

}



.hero-card-1 {

  top: 10%;

  left: 0;

  animation: float 4s ease-in-out infinite;

}



.hero-card-2 {

  bottom: 15%;

  right: 0;

  animation: float 5s ease-in-out infinite 0.5s;

}



.hero-card-icon {

  width: 44px;

  height: 44px;

  border-radius: var(--radius-sm);

  display: flex;

  align-items: center;

  justify-content: center;

  flex-shrink: 0;

}



.hero-card-title {

  font-size: 0.75rem;

  color: var(--color-text-muted);

  font-weight: 500;

}



.hero-card-value {

  font-size: 1rem;

  color: var(--color-primary);

  font-weight: 700;

}



@media (max-width: 992px) {

  .hero-content {

    grid-template-columns: 1fr;

    text-align: center;

  }



  .hero-badge,

  .hero-actions,

  .hero-stats {

    justify-content: center;

  }



  .hero-desc {

    margin-left: auto;

    margin-right: auto;

  }



  .hero-visual {

    display: none;

  }



  .hero h1 {

    font-size: 2.5rem;

  }

}



@media (max-width: 640px) {

  .hero h1 {

    font-size: 2rem;

  }



  .hero-stats {

    flex-wrap: wrap;

    gap: var(--space-lg);

  }



  .hero-stat-num {

    font-size: 1.75rem;

  }

}



/* ===== Why Choose Us Section ===== */

.why-grid {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-3xl);

  align-items: center;

}



.why-list {

  margin-top: var(--space-xl);

}



.why-item {

  display: flex;

  gap: var(--space-md);

  margin-bottom: var(--space-xl);

}



.why-check {

  width: 36px;

  height: 36px;

  border-radius: var(--radius-sm);

  background: rgba(46, 204, 113, 0.1);

  color: var(--color-success);

  display: flex;

  align-items: center;

  justify-content: center;

  flex-shrink: 0;

}



.why-item h4 {

  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-xs);

}



.why-item p {

  font-size: 0.875rem;

  color: var(--color-text-secondary);

  line-height: 1.7;

}



.why-image-card {

  display: flex;

  flex-direction: column;

  gap: var(--space-md);

}



.why-stat-row {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-md);

}



.why-stat-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-xl);

  text-align: center;

  box-shadow: var(--shadow-sm);

  border: 1px solid var(--color-border-light);

}



.why-stat-card.accent {

  background: var(--color-accent);

  border-color: var(--color-accent);

}



.why-stat-card.accent .why-stat-num {

  color: var(--color-white);

}



.why-stat-card.accent .why-stat-label {

  color: rgba(255, 255, 255, 0.8);

}



.why-stat-num {

  font-size: 2.5rem;

  font-weight: 800;

  color: var(--color-primary);

  line-height: 1;

  letter-spacing: -0.02em;

}



.why-stat-label {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  margin-top: var(--space-sm);

}



.why-image-placeholder {

  border-radius: var(--radius-lg);

  overflow: hidden;

  box-shadow: var(--shadow-md);

}



.why-trust {

  display: flex;

  gap: var(--space-lg);

  flex-wrap: wrap;

}



.why-trust-item {

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  font-weight: 500;

}



.why-trust-item svg {

  color: var(--color-teal);

}



@media (max-width: 992px) {

  .why-grid {

    grid-template-columns: 1fr;

  }

}



/* ===== Brands Grid ===== */

.brands-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-md);

}



.brand-item {

  background: var(--color-white);

  border: 1px solid var(--color-border);

  border-radius: var(--radius-md);

  padding: var(--space-xl) var(--space-lg);

  text-align: center;

  font-size: 0.9375rem;

  font-weight: 600;

  color: var(--color-text-secondary);

  transition: all var(--transition-base);

}



.brand-item:hover {

  border-color: var(--color-accent);

  color: var(--color-accent);

  transform: translateY(-2px);

  box-shadow: var(--shadow-md);

}



@media (max-width: 768px) {

  .brands-grid {

    grid-template-columns: repeat(2, 1fr);

  }

}



/* ===== Service Detail (Services Page) ===== */

.service-detail {

  display: grid;

  grid-template-columns: 1.3fr 1fr;

  gap: var(--space-3xl);

  align-items: start;

}



.service-detail.reverse {

  grid-template-columns: 1fr 1.3fr;

}



.service-detail.reverse .service-detail-visual {

  order: -1;

}



.service-features {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-md);

  margin: var(--space-xl) 0;

}



.service-feature {

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  font-size: 0.9375rem;

  color: var(--color-text);

}



.service-feature svg {

  color: var(--color-success);

  flex-shrink: 0;

}



.service-cta {

  display: flex;

  gap: var(--space-md);

  margin-top: var(--space-xl);

  flex-wrap: wrap;

}



/* Service Visual Card */

.service-visual-card {

  background: var(--color-white);

  border-radius: var(--radius-xl);

  padding: var(--space-2xl);

  box-shadow: var(--shadow-lg);

  border: 1px solid var(--color-border-light);

  position: sticky;

  top: calc(var(--header-height) + var(--space-xl));

}



.service-visual-card.maintenance {

  border-top: 4px solid var(--color-teal);

}



.service-visual-card.repair {

  border-top: 4px solid var(--color-accent);

}



.service-visual-card.parts {

  border-top: 4px solid var(--color-primary);

}



.service-visual-card.energy {

  border-top: 4px solid var(--color-success);

}



.service-visual-header {

  display: flex;

  gap: var(--space-sm);

  margin-bottom: var(--space-lg);

}



.service-plan-title {

  font-size: 1.375rem;

  font-weight: 800;

  color: var(--color-primary);

  margin-bottom: var(--space-sm);

}



.service-plan-price {

  display: flex;

  align-items: baseline;

  gap: 2px;

  color: var(--color-accent);

  margin-bottom: var(--space-xs);

}



.price-symbol {

  font-size: 1.25rem;

  font-weight: 700;

}



.price-amount {

  font-size: 2.5rem;

  font-weight: 800;

  letter-spacing: -0.03em;

  line-height: 1;

}



.price-unit {

  font-size: 0.875rem;

  color: var(--color-text-muted);

  margin-left: var(--space-xs);

}



.service-plan-desc {

  font-size: 0.875rem;

  color: var(--color-text-secondary);

  margin-bottom: var(--space-lg);

  padding-bottom: var(--space-lg);

  border-bottom: 1px solid var(--color-border-light);

}



.service-plan-list {

  display: flex;

  flex-direction: column;

  gap: var(--space-md);

}



.service-plan-list li {

  display: flex;

  align-items: flex-start;

  gap: var(--space-sm);

  font-size: 0.9375rem;

  color: var(--color-text);

  position: relative;

  padding-left: var(--space-lg);

}



.service-plan-list li::before {

  content: "";

  position: absolute;

  left: 0;

  top: 8px;

  width: 6px;

  height: 6px;

  border-radius: 50%;

  background: var(--color-accent);

}



/* Repair Types */

.repair-types {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-lg);

  margin: var(--space-xl) 0;

}



.repair-type {

  padding: var(--space-lg);

  background: var(--color-white);

  border-radius: var(--radius-md);

  border: 1px solid var(--color-border-light);

}



.repair-type h4 {

  font-size: 0.9375rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-xs);

}



.repair-type p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.6;

}



/* Parts Grid */

.parts-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-md);

  margin: var(--space-xl) 0;

}



.part-category {

  text-align: center;

  padding: var(--space-lg);

  background: var(--color-bg-alt);

  border-radius: var(--radius-md);

  transition: all var(--transition-fast);

}



.part-category:hover {

  background: var(--color-white);

  box-shadow: var(--shadow-md);

}



.part-icon {

  width: 48px;

  height: 48px;

  margin: 0 auto var(--space-sm);

  color: var(--color-accent);

}



.part-icon svg {

  width: 100%;

  height: 100%;

}



.part-category h4 {

  font-size: 0.9375rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: 2px;

}



.part-category p {

  font-size: 0.8125rem;

  color: var(--color-text-muted);

}



/* Energy Savings */

.energy-savings {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-md);

  margin: var(--space-xl) 0;

}



.saving-item {

  text-align: center;

  padding: var(--space-lg);

  background: var(--color-white);

  border-radius: var(--radius-md);

  border: 1px solid var(--color-border-light);

}



.saving-value {

  font-size: 1.5rem;

  font-weight: 800;

  color: var(--color-teal);

  letter-spacing: -0.02em;

}



.saving-label {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  margin-top: var(--space-xs);

}



/* FAQ List */

.faq-list {

  margin-top: var(--space-xl);

}



@media (max-width: 768px) {

  .service-detail,

  .service-detail.reverse {

    grid-template-columns: 1fr;

  }



  .service-detail.reverse .service-detail-visual {

    order: 0;

  }



  .service-visual-card {

    position: static;

  }



  .service-features,

  .repair-types,

  .parts-grid,

  .energy-savings {

    grid-template-columns: 1fr;

  }

}



/* ===== Booking Page Specific ===== */

.booking-layout {

  display: grid;

  grid-template-columns: 1fr 350px;

  gap: var(--space-2xl);

  align-items: start;

}



.booking-form-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-2xl);

  box-shadow: var(--shadow-sm);

  border: 1px solid var(--color-border-light);

}



.booking-sidebar {

  position: sticky;

  top: calc(var(--header-height) + var(--space-xl));

}



.booking-info-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-xl);

  box-shadow: var(--shadow-sm);

  border: 1px solid var(--color-border-light);

  margin-bottom: var(--space-lg);

}



.booking-info-card h3 {

  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-md);

}



.booking-info-list {

  display: flex;

  flex-direction: column;

  gap: var(--space-md);

}



.booking-info-item {

  display: flex;

  gap: var(--space-md);

  align-items: flex-start;

}



.booking-info-icon {

  width: 40px;

  height: 40px;

  border-radius: var(--radius-sm);

  background: rgba(255, 107, 53, 0.08);

  color: var(--color-accent);

  display: flex;

  align-items: center;

  justify-content: center;

  flex-shrink: 0;

}



.booking-info-item h4 {

  font-size: 0.875rem;

  font-weight: 600;

  color: var(--color-primary);

  margin-bottom: 2px;

}



.booking-info-item p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.5;

}



/* Service Type Cards (Booking) */

.service-type-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-md);

  margin-bottom: var(--space-lg);

}



.service-type-card {

  padding: var(--space-lg);

  border: 2px solid var(--color-border);

  border-radius: var(--radius-md);

  text-align: center;

  cursor: pointer;

  transition: all var(--transition-fast);

}



.service-type-card:hover {

  border-color: var(--color-accent-light);

}



.service-type-card.selected {

  border-color: var(--color-accent);

  background: rgba(255, 107, 53, 0.05);

}



.service-type-card svg {

  width: 32px;

  height: 32px;

  margin: 0 auto var(--space-sm);

  color: var(--color-text-secondary);

  transition: color var(--transition-fast);

}



.service-type-card.selected svg {

  color: var(--color-accent);

}



.service-type-card h4 {

  font-size: 0.875rem;

  font-weight: 600;

  color: var(--color-primary);

}



@media (max-width: 992px) {

  .booking-layout {

    grid-template-columns: 1fr;

  }



  .booking-sidebar {

    position: static;

  }



  .service-type-grid {

    grid-template-columns: repeat(2, 1fr);

  }

}



/* ===== Cases Page ===== */

.case-filters {

  display: flex;

  gap: var(--space-sm);

  flex-wrap: wrap;

  margin-bottom: var(--space-2xl);

  justify-content: center;

}



.case-filter {

  padding: 0.5rem 1.25rem;

  border: 1.5px solid var(--color-border);

  border-radius: var(--radius-full);

  font-size: 0.875rem;

  font-weight: 500;

  color: var(--color-text-secondary);

  cursor: pointer;

  transition: all var(--transition-fast);

  background: var(--color-white);

}



.case-filter:hover {

  border-color: var(--color-accent-light);

}



.case-filter.active {

  background: var(--color-accent);

  border-color: var(--color-accent);

  color: var(--color-white);

}



.case-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-xl);

}



.case-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  overflow: hidden;

  box-shadow: var(--shadow-sm);

  border: 1px solid var(--color-border-light);

  transition: all var(--transition-base);

}



.case-card:hover {

  box-shadow: var(--shadow-lg);

  transform: translateY(-4px);

}



.case-card-image {

  height: 200px;

  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));

  display: flex;

  align-items: center;

  justify-content: center;

  position: relative;

  overflow: hidden;

}



.case-card-image::before {

  content: "";

  position: absolute;

  inset: 0;

  background-image:

    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),

    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);

  background-size: 30px 30px;

}



.case-card-image svg {

  width: 80px;

  height: 80px;

  color: rgba(255, 255, 255, 0.3);

  z-index: 1;

}



/* 图片占位提示 - 美工替换为案例现场照片(400x200px) */

.case-card-image::after {

  content: "📷 案例现场照片待替换 (400×200px)";

  position: absolute;

  bottom: 8px;

  left: 0;

  right: 0;

  text-align: center;

  font-size: 0.6875rem;

  color: rgba(255,255,255,0.5);

  z-index: 1;

  pointer-events: none;

}



.case-card-tag {

  position: absolute;

  top: var(--space-md);

  left: var(--space-md);

  z-index: 2;

}



.case-card-body {

  padding: var(--space-xl);

}



.case-card-body h3 {

  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-sm);

}



.case-card-meta {

  display: flex;

  gap: var(--space-md);

  font-size: 0.8125rem;

  color: var(--color-text-muted);

  margin-bottom: var(--space-md);

}



.case-card-desc {

  font-size: 0.875rem;

  color: var(--color-text-secondary);

  line-height: 1.7;

  margin-bottom: var(--space-md);

}



.case-card-result {

  display: flex;

  gap: var(--space-md);

  padding-top: var(--space-md);

  border-top: 1px solid var(--color-border-light);

}



.case-result-item {

  flex: 1;

}



.case-result-value {

  font-size: 1.25rem;

  font-weight: 800;

  color: var(--color-accent);

  line-height: 1;

}



.case-result-label {

  font-size: 0.75rem;

  color: var(--color-text-muted);

  margin-top: 2px;

}



@media (max-width: 992px) {

  .case-grid {

    grid-template-columns: repeat(2, 1fr);

  }

}



@media (max-width: 640px) {

  .case-grid {

    grid-template-columns: 1fr;

  }

  .values-grid {

    grid-template-columns: 1fr;

  }

}



/* ===== Network Page ===== */

.region-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-lg);

}



.region-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-xl);

  border: 1px solid var(--color-border-light);

  box-shadow: var(--shadow-sm);

  transition: all var(--transition-base);

}



.region-card:hover {

  box-shadow: var(--shadow-md);

  border-color: var(--color-border);

  transform: translateY(-2px);

}



.region-header {

  display: flex;

  align-items: center;

  justify-content: space-between;

  margin-bottom: var(--space-md);

  padding-bottom: var(--space-md);

  border-bottom: 1px solid var(--color-border-light);

}



.region-name {

  font-size: 1.125rem;

  font-weight: 700;

  color: var(--color-primary);

}



.region-cities {

  display: flex;

  flex-wrap: wrap;

  gap: var(--space-xs);

}



.region-city {

  padding: 0.25rem 0.625rem;

  font-size: 0.8125rem;

  background: var(--color-bg-alt);

  border-radius: var(--radius-sm);

  color: var(--color-text-secondary);

}



.region-response {

  margin-top: var(--space-md);

  padding-top: var(--space-md);

  border-top: 1px solid var(--color-border-light);

  font-size: 0.8125rem;

  color: var(--color-text-muted);

  display: flex;

  align-items: center;

  gap: var(--space-sm);

}



.region-response svg {

  width: 16px;

  height: 16px;

  color: var(--color-success);

}



@media (max-width: 768px) {

  .region-grid {

    grid-template-columns: 1fr;

  }

}



/* ===== About Page ===== */

.about-story {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-3xl);

  align-items: center;

}



.about-story-content h2 {

  font-size: 2rem;

  font-weight: 800;

  color: var(--color-primary);

  margin-bottom: var(--space-lg);

  letter-spacing: -0.02em;

}



.about-story-content p {

  color: var(--color-text-secondary);

  line-height: 1.8;

  margin-bottom: var(--space-md);

}



.about-story-visual {

  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));

  border-radius: var(--radius-xl);

  padding: var(--space-3xl);

  color: var(--color-white);

  position: relative;

  overflow: hidden;

}



.about-story-visual::before {

  content: "";

  position: absolute;

  top: -30%;

  right: -30%;

  width: 300px;

  height: 300px;

  background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);

  border-radius: 50%;

}



.about-milestone {

  position: relative;

  z-index: 1;

}



.about-milestone-number {

  font-size: 3.5rem;

  font-weight: 800;

  color: var(--color-accent);

  line-height: 1;

  letter-spacing: -0.03em;

}



.about-milestone-label {

  font-size: 1rem;

  color: rgba(255, 255, 255, 0.7);

  margin-top: var(--space-sm);

}



.values-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-lg);

}



.value-card {

  text-align: center;

  padding: var(--space-2xl) var(--space-xl);

}



.value-card .card-icon {

  margin: 0 auto var(--space-lg);

}



.cert-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-md);

}



.cert-item {

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-md);

  padding: var(--space-xl);

  text-align: center;

  transition: all var(--transition-base);

}



.cert-item:hover {

  box-shadow: var(--shadow-md);

  transform: translateY(-2px);

}



.cert-icon {

  width: 56px;

  height: 56px;

  margin: 0 auto var(--space-md);

  color: var(--color-teal);

}



.cert-item h4 {

  font-size: 0.9375rem;

  font-weight: 700;

  color: var(--color-primary);

  margin-bottom: var(--space-xs);

}



.cert-item p {

  font-size: 0.8125rem;

  color: var(--color-text-muted);

}



@media (max-width: 992px) {

  .about-story {

    grid-template-columns: 1fr;

  }



  .values-grid {

    grid-template-columns: repeat(2, 1fr);

  }



  .cert-grid {

    grid-template-columns: repeat(2, 1fr);

  }

}



/* ===== Contact Page ===== */

.contact-layout {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-2xl);

}



.contact-info-grid {

  display: grid;

  grid-template-columns: 1fr 1fr;

  gap: var(--space-md);

  margin-top: var(--space-xl);

}



.contact-info-card {

  padding: var(--space-lg);

  background: var(--color-white);

  border-radius: var(--radius-md);

  border: 1px solid var(--color-border-light);

}



.contact-info-card .card-icon {

  width: 40px;

  height: 40px;

  margin-bottom: var(--space-sm);

}



.contact-info-card h4 {

  font-size: 0.875rem;

  font-weight: 600;

  color: var(--color-primary);

  margin-bottom: var(--space-xs);

}



.contact-info-card p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.6;

}



.contact-form-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  padding: var(--space-2xl);

  box-shadow: var(--shadow-md);

}



@media (max-width: 768px) {

  .contact-layout {

    grid-template-columns: 1fr;

  }



  .contact-info-grid {

    grid-template-columns: 1fr;

  }

}



/* ========================================

   IMAGE PLACEHOLDER COMPONENT

   图片占位组件 - 美工替换图片时使用

   ======================================== */

.img-placeholder {

  position: relative;

  width: 100%;

  background: linear-gradient(135deg, #e8edf3 0%, #dde4ec 100%);

  border: 2px dashed #b0c4d8;

  border-radius: var(--radius-lg);

  display: flex;

  flex-direction: column;

  align-items: center;

  justify-content: center;

  overflow: hidden;

  transition: border-color 0.3s, background 0.3s;

}



.img-placeholder:hover {

  border-color: var(--color-accent);

  background: linear-gradient(135deg, #fff5f0 0%, #ffe8de 100%);

}



.img-placeholder-icon {

  width: 48px;

  height: 48px;

  color: #8898aa;

  margin-bottom: var(--space-sm);

}



.img-placeholder-text {

  font-size: 0.8125rem;

  color: #8898aa;

  text-align: center;

  padding: 0 var(--space-md);

  line-height: 1.5;

}



.img-placeholder-text strong {

  color: #5a6c7d;

  display: block;

  margin-bottom: 4px;

}



.img-placeholder-text span {

  font-size: 0.75rem;

  color: #a8b8c8;

}



/* Size variants */

.img-ph-lg { min-height: 360px; }

.img-ph-md { min-height: 240px; }

.img-ph-sm { min-height: 160px; }

.img-ph-wide { min-height: 200px; }

.img-ph-square { aspect-ratio: 1; }

.img-ph-card { min-height: 180px; border-radius: var(--radius-md) var(--radius-md) 0 0; }



/* Dark variant for hero sections */

.img-placeholder.dark {

  background: linear-gradient(135deg, rgba(10,37,64,0.3) 0%, rgba(10,37,64,0.5) 100%);

  border-color: rgba(255,255,255,0.2);

}



.img-placeholder.dark .img-placeholder-icon { color: rgba(255,255,255,0.4); }

.img-placeholder.dark .img-placeholder-text { color: rgba(255,255,255,0.5); }

.img-placeholder.dark .img-placeholder-text strong { color: rgba(255,255,255,0.6); }



/* ========================================

   TECH ENCYCLOPEDIA PAGE - 技术百科

   ======================================== */

.tech-search-bar {

  display: flex;

  gap: var(--space-sm);

  max-width: 600px;

  margin: 0 auto var(--space-2xl);

}



.tech-search-bar input {

  flex: 1;

  padding: var(--space-sm) var(--space-md);

  border: 2px solid var(--color-border);

  border-radius: var(--radius-md);

  font-size: 0.9375rem;

  background: var(--color-white);

}



.tech-search-bar input:focus {

  outline: none;

  border-color: var(--color-accent);

}



.tech-search-bar .btn {

  white-space: nowrap;

}



.tech-categories {

  display: flex;

  flex-wrap: wrap;

  gap: var(--space-sm);

  justify-content: center;

  margin-bottom: var(--space-2xl);

}



.tech-cat-btn {

  padding: var(--space-xs) var(--space-md);

  border: 2px solid var(--color-border);

  border-radius: var(--radius-pill);

  background: var(--color-white);

  color: var(--color-text-secondary);

  font-size: 0.875rem;

  font-weight: 600;

  cursor: pointer;

  transition: all 0.25s;

}



.tech-cat-btn:hover {

  border-color: var(--color-accent);

  color: var(--color-accent);

}



.tech-cat-btn.active {

  background: var(--color-primary);

  border-color: var(--color-primary);

  color: var(--color-white);

}



.tech-article-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-xl);

}



.tech-article-card {

  background: var(--color-white);

  border-radius: var(--radius-lg);

  overflow: hidden;

  box-shadow: var(--shadow-sm);

  transition: transform 0.3s, box-shadow 0.3s;

  border: 1px solid var(--color-border-light);

}



.tech-article-card:hover {

  transform: translateY(-4px);

  box-shadow: var(--shadow-md);

}



.tech-article-thumb {

  position: relative;

  min-height: 160px;

  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);

  display: flex;

  align-items: center;

  justify-content: center;

}



.tech-article-thumb svg {

  width: 48px;

  height: 48px;

  color: rgba(255,255,255,0.3);

}



.tech-article-tag {

  position: absolute;

  top: var(--space-sm);

  left: var(--space-sm);

  padding: 4px 12px;

  background: rgba(255,107,53,0.9);

  color: var(--color-white);

  font-size: 0.6875rem;

  font-weight: 700;

  border-radius: var(--radius-pill);

  text-transform: uppercase;

  letter-spacing: 0.5px;

}



.tech-article-body {

  padding: var(--space-lg);

}



.tech-article-body h3 {

  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-text);

  margin-bottom: var(--space-xs);

  line-height: 1.4;

}



.tech-article-body p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.6;

  margin-bottom: var(--space-md);

}



.tech-article-meta {

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  font-size: 0.75rem;

  color: var(--color-text-tertiary);

}



.tech-article-meta span {

  display: flex;

  align-items: center;

  gap: 4px;

}



.tech-glossary {

  background: var(--color-bg-alt);

  border-radius: var(--radius-lg);

  padding: var(--space-2xl);

}



.tech-glossary-list {

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: var(--space-md);

  margin-top: var(--space-lg);

}



.tech-glossary-item {

  display: flex;

  gap: var(--space-sm);

  padding: var(--space-sm) 0;

  border-bottom: 1px solid var(--color-border-light);

}



.tech-glossary-item dt {

  font-weight: 700;

  color: #319b42;

  font-size: 1.375rem;

  flex-shrink: 0;

  width: 100px;

}



.tech-glossary-item dd {

  font-size: 1.1125rem;

  color: #000000;

  line-height: 1.5;

}



/* ========================================

   PARTS SUPPLY PAGE - 配件供应

   ======================================== */

.parts-search-section {

  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);

  color: var(--color-white);

  padding: var(--space-3xl) 0;

}



.parts-search-box {

  max-width: 600px;

  margin: var(--space-xl) auto 0;

  display: flex;

  gap: var(--space-sm);

}



.parts-search-box input {

  flex: 1;

  padding: var(--space-md) var(--space-lg);

  border: none;

  border-radius: var(--radius-md);

  font-size: 0.9375rem;

}



.parts-search-box input:focus { outline: none; }



.parts-category-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-lg);

}



.parts-category-card {

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-lg);

  padding: var(--space-xl);

  text-align: center;

  transition: all 0.3s;

  cursor: pointer;

}



.parts-category-card:hover {

  border-color: var(--color-accent);

  transform: translateY(-2px);

  box-shadow: var(--shadow-md);

}



.parts-category-icon {

  width: 64px;

  height: 64px;

  margin: 0 auto var(--space-md);

  background: rgba(0,168,168,0.1);

  border-radius: var(--radius-circle);

  display: flex;

  align-items: center;

  justify-content: center;

  color: var(--color-accent2);

}



.parts-category-card h3 {

  font-size: 1.0625rem;

  font-weight: 700;

  margin-bottom: var(--space-xs);

}



.parts-category-card p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.5;

  margin-bottom: var(--space-sm);

}



.parts-category-count {

  display: inline-block;

  padding: 2px 12px;

  background: var(--color-bg-alt);

  border-radius: var(--radius-pill);

  font-size: 0.75rem;

  color: var(--color-text-tertiary);

  font-weight: 600;

}



.parts-product-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-lg);

}



.parts-product-card {

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-lg);

  overflow: hidden;

  transition: all 0.3s;

}



.parts-product-card:hover {

  border-color: var(--color-accent);

  box-shadow: var(--shadow-md);

  transform: translateY(-2px);

}



.parts-product-thumb {

  min-height: 160px;

  background: linear-gradient(135deg, #f0f4f8 0%, #e8edf3 100%);

  display: flex;

  align-items: center;

  justify-content: center;

  position: relative;

}



.parts-product-thumb svg {

  width: 48px;

  height: 48px;

  color: #b0c4d8;

}



.parts-product-badge {

  position: absolute;

  top: var(--space-sm);

  right: var(--space-sm);

  padding: 3px 10px;

  background: var(--color-accent);

  color: var(--color-white);

  font-size: 0.6875rem;

  font-weight: 700;

  border-radius: var(--radius-pill);

}



.parts-product-badge.original { background: var(--color-accent2); }



.parts-product-body {

  padding: var(--space-md);

}



.parts-product-body h3 {

  font-size: 0.9375rem;

  font-weight: 700;

  margin-bottom: 4px;

  line-height: 1.4;

}



.parts-product-sku {

  font-size: 0.75rem;

  color: var(--color-text-tertiary);

  margin-bottom: var(--space-xs);

}



.parts-product-price {

  display: flex;

  align-items: baseline;

  gap: 4px;

  margin-bottom: var(--space-sm);

}



.parts-product-price .price {

  font-size: 1.125rem;

  font-weight: 700;

  color: var(--color-accent);

}



.parts-product-price .unit {

  font-size: 0.75rem;

  color: var(--color-text-tertiary);

}



.parts-inquiry-btn {

  width: 100%;

  padding: var(--space-xs);

  border: 2px solid var(--color-border);

  border-radius: var(--radius-md);

  background: var(--color-white);

  color: var(--color-primary);

  font-size: 0.8125rem;

  font-weight: 600;

  cursor: pointer;

  transition: all 0.25s;

}



.parts-inquiry-btn:hover {

  background: var(--color-primary);

  border-color: var(--color-primary);

  color: var(--color-white);

}



/* ========================================

   HELP CENTER PAGE - 帮助中心

   ======================================== */

.help-hero-search {

  max-width: 600px;

  margin: var(--space-xl) auto 0;

  display: flex;

  gap: var(--space-sm);

}



.help-hero-search input {

  flex: 1;

  padding: var(--space-md) var(--space-lg);

  border: none;

  border-radius: var(--radius-md);

  font-size: 0.9375rem;

}



.help-hero-search input:focus { outline: none; }



.help-quick-grid {

  display: grid;

  grid-template-columns: repeat(4, 1fr);

  gap: var(--space-lg);

}



.help-quick-card {

  text-align: center;

  padding: var(--space-xl);

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-lg);

  transition: all 0.3s;

  text-decoration: none;

  color: inherit;

}



.help-quick-card:hover {

  border-color: var(--color-accent);

  transform: translateY(-2px);

  box-shadow: var(--shadow-md);

}



.help-quick-card .card-icon {

  width: 56px;

  height: 56px;

  margin: 0 auto var(--space-md);

}



.help-quick-card h3 {

  font-size: 1rem;

  font-weight: 700;

  margin-bottom: var(--space-xs);

}



.help-quick-card p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.5;

}



.help-faq-section {

  display: grid;

  grid-template-columns: 260px 1fr;

  gap: var(--space-2xl);

}



.help-faq-sidebar {

  position: sticky;

  top: 100px;

  align-self: start;

}



.help-faq-nav {

  list-style: none;

  padding: 0;

  margin: 0;

}



.help-faq-nav li {

  margin-bottom: 4px;

}



.help-faq-nav a {

  display: block;

  padding: var(--space-sm) var(--space-md);

  border-radius: var(--radius-md);

  font-size: 0.875rem;

  color: var(--color-text-secondary);

  text-decoration: none;

  transition: all 0.2s;

  border-left: 3px solid transparent;

}



.help-faq-nav a:hover {

  background: var(--color-bg-alt);

  color: var(--color-primary);

}



.help-faq-nav a.active {

  background: rgba(255,107,53,0.08);

  color: var(--color-accent);

  border-left-color: var(--color-accent);

  font-weight: 600;

}



.help-faq-group {

  margin-bottom: var(--space-2xl);

}



.help-faq-group-title {

  display: flex;

  align-items: center;

  gap: var(--space-sm);

  font-size: 1.25rem;

  font-weight: 700;

  color: var(--color-text);

  margin-bottom: var(--space-lg);

  padding-bottom: var(--space-sm);

  border-bottom: 2px solid var(--color-border-light);

}



.help-faq-group-title .num {

  width: 32px;

  height: 32px;

  background: var(--color-primary);

  color: var(--color-white);

  border-radius: 50%;

  display: flex;

  align-items: center;

  justify-content: center;

  font-size: 0.875rem;

  flex-shrink: 0;

}



.help-diagnose-grid {

  display: grid;

  grid-template-columns: repeat(3, 1fr);

  gap: var(--space-lg);

}



.help-diagnose-card {

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-lg);

  padding: var(--space-lg);

  cursor: pointer;

  transition: all 0.3s;

}



.help-diagnose-card:hover {

  border-color: var(--color-accent2);

  box-shadow: var(--shadow-md);

}



.help-diagnose-card .symptom-icon {

  width: 48px;

  height: 48px;

  margin-bottom: var(--space-sm);

  background: rgba(255,107,53,0.1);

  border-radius: var(--radius-md);

  display: flex;

  align-items: center;

  justify-content: center;

  color: var(--color-accent);

}



.help-diagnose-card h4 {

  font-size: 0.9375rem;

  font-weight: 700;

  margin-bottom: var(--space-xs);

}



.help-diagnose-card p {

  font-size: 0.8125rem;

  color: var(--color-text-secondary);

  line-height: 1.5;

  margin-bottom: var(--space-sm);

}



.help-diagnose-card .possible-cause {

  font-size: 0.75rem;

  color: var(--color-accent);

  font-weight: 600;

}



.help-download-list {

  display: grid;

  grid-template-columns: repeat(2, 1fr);

  gap: var(--space-md);

}



.help-download-item {

  display: flex;

  flex-wrap: wrap;

  align-items: center;

  gap: var(--space-md);

  padding: var(--space-md) var(--space-lg);

  background: var(--color-white);

  border: 1px solid var(--color-border-light);

  border-radius: var(--radius-md);

  transition: all 0.25s;

}



.help-download-item:hover {

  border-color: var(--color-accent2);

  background: rgba(0,168,168,0.03);

}



.help-download-icon {

  width: 40px;

  height: 40px;

  background: rgba(0,168,168,0.1);

  border-radius: var(--radius-md);

  display: flex;

  align-items: center;

  justify-content: center;

  color: var(--color-accent2);

  flex-shrink: 0;

}



.help-download-info { flex: 1; }



.help-download-info h4 {

  font-size: 0.875rem;

  font-weight: 600;

  margin-bottom: 2px;

}



.help-download-info span {

  font-size: 0.75rem;

  color: var(--color-text-tertiary);

}



.help-download-btn {

  font-size: 0.75rem;

  color: var(--color-accent2);

  font-weight: 600;

  text-decoration: none;

}



/* 在线查看：点「查看」在内容区就地展开全宽图片查看器（纯 CSS checkbox hack，无 JS、不依赖 fixed），

   WP 主题 transform 兼容、100% 可用；PDF 已转为图片内嵌，无法下载原文档 */

.help-doc-toggle {

  position: absolute;

  opacity: 0;

  pointer-events: none;

}

.help-doc-viewer {

  display: none;

  margin: 16px 0 0;

  width: 100%;

  height: 680px !important;

  max-height: 680px !important;

  overflow: hidden !important;

  box-sizing: border-box;

  border: 1px solid var(--color-border-light, #e3e8ee);

  border-radius: 10px;

  background: var(--color-white, #fff);

  box-shadow: 0 10px 30px rgba(6, 26, 46, 0.18);

}

/* 显示/隐藏由 JS 的 inline style 控制（优先级最高），

   不再依赖 :checked 规则，避免与 JS 的 display 控制冲突。

   保留默认隐藏。 */

.help-doc-viewer { display: none; }

.help-doc-bar {

  height: 52px !important;

  box-sizing: border-box;

  display: flex;

  align-items: center;

  justify-content: space-between;

  padding: 0 14px;

  background: #062a46;

  color: #fff;

  flex-shrink: 0;

}

.help-doc-title { font-weight: 600; font-size: 0.9rem; }

.help-doc-close {

  cursor: pointer;

  width: 36px;

  height: 36px;

  display: inline-flex;

  align-items: center;

  justify-content: center;

  font-size: 1.6rem;

  line-height: 1;

  color: #fff;

  background: rgba(255, 255, 255, 0.16);

  border-radius: 50%;

  user-select: none;

}

.help-doc-close:hover { background: rgba(255, 255, 255, 0.32); }

.help-doc-images {

  /* 固定高度，让内部独立滚动，不再依赖 vh 与 WP 主题滚动机制 */

  height: 628px !important;

  max-height: 628px !important;

  overflow-y: auto !important;

  -webkit-overflow-scrolling: touch;

  overscroll-behavior: contain;

  padding: 14px;

  box-sizing: border-box;

  position: relative;

  display: block;

}

.help-doc-images img {

  display: block;

  width: 100%;

  max-width: 1100px; /* 源图即 1100px 宽，限制最大显示宽度避免被放大变糊 */

  height: auto;

  margin: 0 auto 12px;

  border-radius: 6px;

  background: var(--color-white, #fff);

}

.help-doc-images img:last-child { margin-bottom: 0; }

.help-doc-toggle:checked + .help-doc-viewer { display: block !important; }



/* 移动端：用小一点的高度，避免内容超出视口 */

@media (max-width: 768px) {

  .help-doc-viewer { height: 480px !important; max-height: 480px !important; }

  .help-doc-images { height: 428px !important; max-height: 428px !important; }

}



/* Responsive breakpoints for new sections */

@media (max-width: 992px) {

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

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

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

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

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

  .help-faq-section { grid-template-columns: 1fr; }

  .help-faq-sidebar { position: static; }

}



@media (max-width: 768px) {

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

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

  .parts-category-grid { grid-template-columns: 1fr; }

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

  .help-quick-grid { grid-template-columns: 1fr; }

  .help-diagnose-grid { grid-template-columns: 1fr; }

  .help-download-list { grid-template-columns: 1fr; }

  .tech-search-bar { flex-direction: column; }

}



@media (max-width: 640px) {

  .parts-product-grid { grid-template-columns: 1fr; }

}

  



/* ===== FAQ 原生 details 折叠（无任何JS依赖，WP可用） ===== */

.faq-cat { border: 1px solid var(--color-border, #e5e7eb); border-radius: var(--radius-lg, 12px); margin-bottom: var(--space-lg, 18px); overflow: hidden; background: var(--color-white, #fff); }

.faq-cat > summary { list-style: none; cursor: pointer; padding: var(--space-lg, 18px) var(--space-xl, 32px); font-size: 1.15rem; font-weight: 700; display: flex; align-items: center; gap: var(--space-sm, 8px); background: var(--color-bg-alt, #f5f5f5); color: var(--color-text, #222); }

.faq-cat > summary::-webkit-details-marker { display: none; }

.faq-cat[open] > summary { color: var(--color-primary, #ff6b35); border-bottom: 1px solid var(--color-border-light, #eee); }

.faq-cat > summary .num { width: 32px; height: 32px; background: var(--color-primary, #ff6b35); color: var(--color-white, #fff); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.875rem; flex-shrink: 0; }

.faq-cat .faq-list { padding: var(--space-lg, 18px) var(--space-xl, 32px); }

/* 原生 details 展开时显示答案（覆盖旧 JS 用的 max-height:0 隐藏规则） */

.faq-item[open] > .faq-answer { max-height: none; overflow: visible; padding: 0 var(--space-xl, 32px) var(--space-lg, 18px); }

.faq-item[open] .faq-toggle { transform: rotate(45deg); color: var(--color-accent, #ff6b35); }



/* ===== 操作视频教程 ===== */

.video-tutorials {

  max-width: 1130px !important; /* 左右各留200px（1200-400=800） */

  margin: 0 auto;

  padding: 36px 0 20px; /* 调整上下间距 */

}



.video-tutorials .section-header {

  margin-bottom: 28px; /* 标题与卡片间距 */

}



.video-tutorials .grid {

  gap: 20px; 

}



/* 响应式：小屏时不再居中限宽，撑满 */

@media (max-width: 992px) {

  .video-tutorials {

    max-width: 100%;

  }

}