/* ============================================================
   ssrdog 温暖机械工坊 - 样式规范 (Mechanical Workshop Theme)
   Palette:
   - Charcoal Black (炭黑背景): #15191D
   - Deep Card Background: #1B222A / #202832
   - Card Border & Rivets: #2C3744
   - Brass Accent (黄铜色重点): #F4BC63 / #E2A445
   - Mint Green (薄荷绿线路): #72D5C3 / #4FA898
   - Cool Steel Slate (文本与高亮): #CBD3DE / #8B9BB0
   ============================================================ */

:root {
  --bg-primary: #15191D;
  --bg-surface: #1B222A;
  --bg-surface-elevated: #212A34;
  --bg-surface-inset: #121518;
  --border-metal: #2C3744;
  --border-metal-brass: rgba(244, 188, 99, 0.35);
  --border-metal-mint: rgba(114, 213, 195, 0.4);

  --bg-card-glass: linear-gradient(180deg, rgba(27, 34, 43, 0.78) 0%, rgba(19, 24, 30, 0.94) 100%);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(114, 213, 195, 0.5);
  --shadow-glass: 0 4px 24px -2px rgba(0, 0, 0, 0.5), inset 0 1px 0 0 rgba(255, 255, 255, 0.08);
  --shadow-glass-hover: 0 20px 40px -10px rgba(0, 0, 0, 0.7), 0 0 30px -5px rgba(114, 213, 195, 0.18), inset 0 1px 0 0 rgba(255, 255, 255, 0.15);
  
  --brass: #F4BC63;
  --brass-light: #FFDDA1;
  --brass-dark: #C89038;
  --brass-glow: rgba(244, 188, 99, 0.25);
  
  --mint: #72D5C3;
  --mint-light: #A5F2E4;
  --mint-dark: #3E9484;
  --mint-glow: rgba(114, 213, 195, 0.35);
  
  --text-primary: #F0F4F8;
  --text-secondary: #CBD3DE;
  --text-muted: #8292A2;
  
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-max: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
  --shadow-workshop: 0 12px 36px rgba(0, 0, 0, 0.45);
  --shadow-brass: 0 0 24px rgba(244, 188, 99, 0.25);
  --shadow-mint: 0 0 24px rgba(114, 213, 195, 0.28);
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
}

body {
  font-family: var(--font-base);
  line-height: 1.65;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(244, 188, 99, 0.045) 0%, transparent 45%),
    radial-gradient(circle at 85% 35%, rgba(114, 213, 195, 0.045) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(114, 213, 195, 0.035) 0%, transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility Focus Outline */
:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

a {
  color: var(--mint);
  text-decoration: none;
  transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

a:hover {
  color: var(--mint-light);
  text-shadow: 0 0 8px var(--mint-glow);
}

p {
  margin-bottom: 1rem;
}

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

ul, ol {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section {
  padding: 4.5rem 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem auto;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.95rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brass);
  background: rgba(244, 188, 99, 0.09);
  border: 1px solid rgba(244, 188, 99, 0.28);
  border-radius: 999px;
  margin-bottom: 1rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.badge-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 8px var(--brass);
}

.badge-tag.mint {
  color: var(--mint);
  background: rgba(114, 213, 195, 0.09);
  border-color: rgba(114, 213, 195, 0.28);
}

.badge-tag.mint::before {
  background: var(--mint);
  box-shadow: 0 0 8px var(--mint);
}

.section-title {
  font-size: 2.15rem;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

.notice-banner {
  background: rgba(244, 188, 99, 0.08);
  border-left: 3px solid var(--brass);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: var(--brass-light);
  margin: 1.25rem 0;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.notice-banner.mint {
  background: rgba(114, 213, 195, 0.08);
  border-left-color: var(--mint);
  color: var(--mint-light);
}

/* Mechanical Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(21, 25, 29, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-metal);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-gear-icon {
  width: 32px;
  height: 32px;
  color: var(--brass);
  animation: gearSpin 14s linear infinite;
}

.brand-name-highlight {
  color: var(--brass);
}

.brand-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.45rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal);
  border-radius: 4px;
  color: var(--mint);
  font-family: var(--font-mono);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.35rem 0;
  position: relative;
}

.nav-link:hover, .nav-link:focus-visible {
  color: var(--brass);
}

.nav-link.active {
  color: var(--mint);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--mint);
  box-shadow: var(--shadow-mint);
}

.header-cta-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Mechanical Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.45rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
}

.btn-brass {
  background: linear-gradient(135deg, #FFDDA1 0%, var(--brass) 45%, var(--brass-dark) 100%);
  color: #121518;
  border: 1px solid rgba(255, 235, 180, 0.45);
  box-shadow: 0 4px 14px rgba(244, 188, 99, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn-brass:hover {
  background: linear-gradient(135deg, #FFF0CF 0%, #FFD07A 50%, var(--brass) 100%);
  color: #080A0C;
  box-shadow: 0 6px 24px rgba(244, 188, 99, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

.btn-outline-mint {
  background: linear-gradient(180deg, rgba(114, 213, 195, 0.12) 0%, rgba(114, 213, 195, 0.05) 100%);
  color: var(--mint);
  border: 1px solid rgba(114, 213, 195, 0.45);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(114, 213, 195, 0.2);
}

.btn-outline-mint:hover {
  background: linear-gradient(180deg, rgba(114, 213, 195, 0.22) 0%, rgba(114, 213, 195, 0.12) 100%);
  color: var(--mint-light);
  border-color: var(--mint);
  box-shadow: 0 6px 20px rgba(114, 213, 195, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-metal);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.btn-secondary:hover {
  background: #283340;
  color: var(--text-primary);
  border-color: var(--brass);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.8rem;
  font-size: 1.05rem;
}

/* Hamburger Toggle Button */
.hamburger-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-metal);
  border-radius: var(--radius-sm);
  width: 42px;
  height: 42px;
  padding: 8px;
  cursor: pointer;
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
}

.hamburger-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-metal);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.6);
  z-index: 2000;
  padding: 1.5rem;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  flex-direction: column;
}

.mobile-nav-drawer.open {
  transform: translateX(0);
}

.mobile-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 1999;
}

.mobile-nav-backdrop.open {
  display: block;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-metal);
}

.mobile-nav-close {
  background: transparent;
  border: 1px solid var(--border-metal);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-nav-close:hover {
  color: var(--text-primary);
  border-color: var(--brass);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
}

.mobile-nav-links a {
  font-size: 1.05rem;
  color: var(--text-primary);
  display: block;
  padding: 0.4rem 0;
}

.mobile-nav-links a:hover {
  color: var(--brass);
}

/* ============================================================
   Hero Section & Interactive Robot Assembly Workshop
   ============================================================ */
.hero-section {
  padding: 3.5rem 0 4.5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-title .highlight-brass {
  color: var(--brass);
  text-shadow: 0 0 20px rgba(244, 188, 99, 0.35);
}

.hero-title .highlight-mint {
  color: var(--mint);
  text-shadow: 0 0 20px rgba(114, 213, 195, 0.35);
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-metal);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.meta-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 8px var(--mint);
}

/* Robot Workshop Stage */
.workshop-stage-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 45px -10px rgba(0, 0, 0, 0.7), 0 0 30px -5px rgba(244, 188, 99, 0.12), inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}

.workshop-stage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brass), var(--mint));
}

.workshop-stage-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(44, 55, 68, 0.6);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.workshop-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.anim-control-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.anim-control-btn:hover {
  border-color: var(--brass);
  color: var(--text-primary);
}

/* Fixed Aspect Ratio Stage Canvas to Avoid CLS */
.robot-canvas-container {
  width: 100%;
  aspect-ratio: 4 / 3;
  max-height: 380px;
  position: relative;
  background: var(--bg-surface-inset);
  border: 1px solid rgba(44, 55, 68, 0.4);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.robot-svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Workshop Stage Footer & Demo Status */
.workshop-stage-footer {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.demo-status-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--mint);
  padding: 0.35rem 0.65rem;
  background: rgba(114, 213, 195, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(114, 213, 195, 0.2);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 6px var(--mint);
  display: inline-block;
}

.demo-disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  text-align: right;
  width: 100%;
}

/* Robot & Mechanical Animation Keyframes */
@keyframes eyeBlink {
  0%, 45%, 55%, 100% {
    transform: scaleY(1);
  }
  50% {
    transform: scaleY(0.1);
  }
}

@keyframes antennaSway {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-12deg);
  }
  75% {
    transform: rotate(12deg);
  }
}

@keyframes gearSpin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes gearSpinReverse {
  from {
    transform: rotate(360deg);
  }
  to {
    transform: rotate(0deg);
  }
}

@keyframes linePulseGlow {
  0%, 100% {
    stroke-opacity: 0.35;
    filter: drop-shadow(0 0 1px var(--mint));
  }
  50% {
    stroke-opacity: 1;
    filter: drop-shadow(0 0 8px var(--mint));
  }
}

@keyframes sparkFlash {
  0%, 100% {
    opacity: 0.2;
    transform: scale(0.85);
  }
  50% {
    opacity: 1;
    transform: scale(1.15);
  }
}

/* Applied Robot Part Classes */
.robot-antenna {
  transform-origin: 200px 75px;
  animation: antennaSway 3.6s ease-in-out infinite;
}

.robot-eyes {
  transform-origin: 200px 115px;
  animation: eyeBlink 4.2s ease-in-out infinite;
}

.robot-gear-primary {
  transform-origin: 175px 195px;
  animation: gearSpin 8s linear infinite;
}

.robot-gear-secondary {
  transform-origin: 225px 200px;
  animation: gearSpinReverse 8s linear infinite;
}

.circuit-path-segment-1 {
  animation: linePulseGlow 3s ease-in-out infinite;
}

.circuit-path-segment-2 {
  animation: linePulseGlow 3s ease-in-out 0.8s infinite;
}

.circuit-path-segment-3 {
  animation: linePulseGlow 3s ease-in-out 1.6s infinite;
}

.workshop-sparks {
  animation: sparkFlash 2s ease-in-out infinite;
}

/* Assembly Demo Active Sequence Classes */
.assembling-demo .robot-gear-primary {
  animation-duration: 2s !important;
}
.assembling-demo .robot-gear-secondary {
  animation-duration: 2s !important;
}
.assembling-demo .circuit-path-segment-1,
.assembling-demo .circuit-path-segment-2,
.assembling-demo .circuit-path-segment-3 {
  stroke: var(--brass-light) !important;
  stroke-width: 4px !important;
  filter: drop-shadow(0 0 10px var(--brass)) !important;
}

/* Global Animation Pause State */
.animations-paused *,
.animations-paused *::before,
.animations-paused *::after {
  animation-play-state: paused !important;
}

/* ============================================================
   Section 1: 组装步骤 (Purchase / Assembly Process)
   ============================================================ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.4rem;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.step-card:hover {
  transform: translateY(-5px);
  border-color: rgba(244, 188, 99, 0.5);
  box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.6), 0 0 20px -5px rgba(244, 188, 99, 0.15), inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
}

.step-number-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--brass);
  background: rgba(244, 188, 99, 0.1);
  border: 1px solid var(--border-metal-brass);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 1rem;
}

.step-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mint);
  margin-bottom: 1.1rem;
}

.step-icon-wrap svg {
  width: 26px;
  height: 26px;
}

.step-card-title {
  font-size: 1.15rem;
  margin-bottom: 0.65rem;
  color: var(--text-primary);
}

.step-card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   Section 2: 零件说明 (Advantages / Specs)
   ============================================================ */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.adv-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-md);
  padding: 2rem 1.6rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.adv-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--mint), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.adv-card:hover {
  border-color: rgba(114, 213, 195, 0.5);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glass-hover);
}

.adv-card:hover::after {
  opacity: 1;
}

.adv-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--mint);
  background: rgba(114, 213, 195, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 1rem;
}

.adv-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.adv-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.1rem;
}

.adv-specs-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px dashed var(--border-metal);
  padding-top: 0.9rem;
  font-size: 0.85rem;
}

.adv-specs-list li {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.45rem;
  color: var(--text-muted);
}

.adv-specs-list li span:last-child {
  color: var(--brass-light);
  font-family: var(--font-mono);
}

/* ============================================================
   Section 3: 电路走线图 (Global Nodes Circuit Routing)
   ============================================================ */
.circuit-routing-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-glass);
}

.circuit-routing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.routing-legend {
  display: flex;
  gap: 1.25rem;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.legend-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.legend-color-dot.mint {
  background: var(--mint);
}

.legend-color-dot.brass {
  background: var(--brass);
}

.circuit-map-container {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 460px;
  background: var(--bg-surface-inset);
  border: 1px solid rgba(44, 55, 68, 0.5);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.circuit-map-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.nodes-grid-info {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.node-chip {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
}

.node-chip-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.node-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.node-type-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--mint);
}

.node-detail {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============================================================
   Section 4: 用途插槽 (AI & Streaming Application Slots)
   ============================================================ */
.slots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.slot-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-md);
  padding: 2rem 1.6rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.slot-card:hover {
  border-color: rgba(244, 188, 99, 0.5);
  transform: translateY(-5px);
  box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.6), 0 0 20px -5px rgba(244, 188, 99, 0.15), inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
}

.slot-pin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--brass);
}

.slot-title {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.slot-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.slot-feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}

.slot-pill {
  font-size: 0.75rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ============================================================
   Section 5: 规格托盘 (Plans / Spec Trays)
   ============================================================ */
.trays-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.tray-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-lg);
  padding: 2.2rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.tray-card:hover {
  transform: translateY(-6px);
  border-color: rgba(114, 213, 195, 0.5);
  box-shadow: var(--shadow-glass-hover);
}

.tray-card.featured {
  border-color: rgba(244, 188, 99, 0.65);
  background: linear-gradient(180deg, rgba(244, 188, 99, 0.08) 0%, rgba(27, 34, 43, 0.85) 40%, rgba(19, 24, 30, 0.95) 100%);
  box-shadow: 0 16px 36px -6px rgba(0, 0, 0, 0.6), 0 0 35px -5px rgba(244, 188, 99, 0.25), inset 0 1px 0 0 rgba(255, 235, 180, 0.25);
}

.tray-card.featured:hover {
  border-color: var(--brass);
  box-shadow: 0 22px 45px -8px rgba(0, 0, 0, 0.7), 0 0 45px -5px rgba(244, 188, 99, 0.35), inset 0 1px 0 0 rgba(255, 235, 180, 0.4);
}

.tray-badge-ribbon {
  position: absolute;
  top: -12px;
  right: 1.5rem;
  background: linear-gradient(135deg, var(--brass) 0%, var(--brass-dark) 100%);
  color: #121518;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.tray-tier-id {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.tray-name {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.tray-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  min-height: 42px;
}

.tray-price-box {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-metal);
}

.tray-price-row {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.tray-price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brass);
}

.tray-price-val {
  font-size: 2.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--brass);
  line-height: 1;
  letter-spacing: -0.02em;
}

.tray-price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: normal;
  margin-left: 0.2rem;
}

.tray-price-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
  font-family: var(--font-mono);
}

.tray-price-tbd {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brass);
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.tray-features {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem 0;
  flex-grow: 1;
}

.tray-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.feature-check {
  color: var(--mint);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================================
   Section 6: 工坊笔记 (9 Articles Card Grid - Desktop 3, Tablet 2, Mobile 1)
   ============================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.85rem;
}

.article-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-glass);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-glass-hover);
}

.article-card-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #0D1318;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-card-cover img,
.article-card-cover svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.article-card:hover .article-card-cover img,
.article-card:hover .article-card-cover svg {
  transform: scale(1.035);
}

.article-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-category {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.22rem 0.65rem;
  border-radius: 9999px;
  background: rgba(244, 188, 99, 0.08);
  border: 1px solid rgba(244, 188, 99, 0.22);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--brass);
  letter-spacing: 0.04em;
  font-weight: 600;
  width: fit-content;
  margin-bottom: 0.85rem;
  transition: all var(--transition-fast);
}

.article-category::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 6px var(--brass);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover .article-category {
  background: rgba(114, 213, 195, 0.1);
  border-color: rgba(114, 213, 195, 0.35);
  color: var(--mint);
}

.article-card:hover .article-category::before {
  background: var(--mint);
  box-shadow: 0 0 6px var(--mint);
}

.article-card-title {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
  line-height: 1.45;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.article-card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.article-card-title a:hover {
  color: var(--mint);
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: #8E9EAF;
  line-height: 1.65;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 0.95rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.article-read-link {
  color: var(--mint);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-base);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.article-card:hover .article-read-link {
  color: var(--mint-light);
  gap: 0.55rem;
}

/* ============================================================
   Section 7: 工坊演示评价 (Demonstration Reviews)
   ============================================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-card-glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: rgba(244, 188, 99, 0.45);
  box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.6), 0 0 20px -5px rgba(244, 188, 99, 0.15), inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
}

.review-badge-demo {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--brass);
  background: rgba(244, 188, 99, 0.1);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 1rem;
}

.review-quote {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--border-metal);
  padding-top: 0.85rem;
}

.user-avatar-placeholder {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-metal-brass);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brass);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.user-meta-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.92rem;
}

.user-meta-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================================
   Section 8: FAQ Accordion
   ============================================================ */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

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

.faq-trigger {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-trigger:hover {
  color: var(--brass);
}

.faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--brass);
}

.faq-content {
  display: none;
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-content {
  display: block;
}

/* ============================================================
   Article Detail & Standalone Pages Styling
   ============================================================ */
.breadcrumbs-nav {
  padding: 1.25rem 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

.breadcrumbs-list li::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--border-metal);
}

.breadcrumbs-list li:last-child::after {
  content: "";
}

.breadcrumbs-list a {
  color: var(--text-secondary);
}

.breadcrumbs-list a:hover {
  color: var(--brass);
}

.article-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border-metal);
  margin-bottom: 2.5rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #D6DFE8;
}

.article-body h2 {
  font-size: 1.75rem;
  margin: 2.5rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-metal);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 1.2em;
  background: var(--brass);
  border-radius: 2px;
}

.article-body h3 {
  font-size: 1.35rem;
  margin: 1.75rem 0 0.85rem;
  color: var(--mint);
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 4px solid var(--brass);
  background: rgba(244, 188, 99, 0.08);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.75rem 0;
  font-style: italic;
  color: var(--brass-light);
}

.article-cta-box {
  background: linear-gradient(135deg, #1C232B 0%, #232C36 100%);
  border: 1px solid var(--border-metal-brass);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin: 3rem 0;
  text-align: center;
  box-shadow: var(--shadow-brass);
}

.article-cta-box h3 {
  color: var(--brass-light);
  font-size: 1.45rem;
  margin-bottom: 0.75rem;
}

.article-cta-box p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 1.5rem auto;
}

.related-posts-section {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-metal);
}

.related-posts-title {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

/* ============================================================
   Footer Section
   ============================================================ */
.site-footer {
  background: #111417;
  border-top: 1px solid var(--border-metal);
  padding: 4rem 0 2rem;
  margin-top: auto;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand-title {
  color: var(--text-primary);
  font-size: 1.2rem;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-heading {
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.55rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

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

.footer-external-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-external-list li {
  margin-bottom: 0.65rem;
}

.footer-external-list a {
  color: var(--mint);
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.footer-bottom {
  border-top: 1px solid rgba(44, 55, 68, 0.6);
  padding-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom-links {
  display: flex;
  gap: 1.25rem;
}

/* ============================================================
   Responsive Breakpoints:
   375px, 390px, 430px (Mobile), 768px (Tablet), 1024px, 1440px
   ============================================================ */

/* Large Desktop (1440px) */
@media (min-width: 1440px) {
  :root {
    --container-max: 1320px;
  }
  .hero-title {
    font-size: 3.2rem;
  }
}

/* Tablet (max-width: 1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-content {
    text-align: center;
  }
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-meta-strip {
    justify-content: center;
  }
  .workshop-stage-card {
    max-width: 580px;
    margin: 0 auto;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .trays-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .slots-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

/* Mobile & Small Tablet (max-width: 768px) */
@media (max-width: 768px) {
  .main-nav, .header-cta-wrap .btn-outline-mint {
    display: none;
  }
  .hamburger-btn {
    display: flex;
  }
  .section {
    padding: 3rem 0;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .nodes-grid-info {
    grid-template-columns: 1fr 1fr;
  }
  .trays-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* Mobile Small (375px, 390px, 430px) */
@media (max-width: 430px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-meta-strip {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
  .nodes-grid-info {
    grid-template-columns: 1fr;
  }
  .workshop-stage-footer {
    flex-direction: column;
    align-items: flex-start;
  }
  .robot-canvas-container {
    max-height: 280px;
  }
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}