/* ==========================================================================
   蓝帆云 Lanfan Cloud - 高维折叠与多面体几何风 (Dimensional Tessellation)
   Design Token & Visual Aesthetics Engine
   ========================================================================== */

:root {
  /* Color Palette - Origami Paper Texture & High Contrast Charcoal */
  --bg-main: #EBE9E4;
  --bg-card: #F4F2EE;
  --bg-card-alt: #E3DFD7;
  --bg-dark: #1A1A1A;
  --bg-dark-surface: #242424;
  
  --text-main: #1A1A1A;
  --text-muted: #5A5852;
  --text-light: #F4F2EE;
  --text-dim: #8C887E;

  --accent-dark: #1A1A1A;
  --accent-gold: #C5A059;
  --accent-gold-light: #DFBC77;
  --accent-origami: #D6D1C6;
  --accent-shadow: rgba(26, 26, 26, 0.08);

  --border-dark: #1A1A1A;
  --border-subtle: rgba(26, 26, 26, 0.12);
  --border-highlight: rgba(255, 255, 255, 0.6);

  /* Fonts */
  --font-sans: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Origami Facet Polygon Shadow Tokens */
  --origami-shadow: 
    -4px 4px 0px rgba(26, 26, 26, 0.9),
    -8px 8px 16px rgba(0, 0, 0, 0.06);

  --origami-shadow-hover: 
    -7px 7px 0px rgba(26, 26, 26, 1),
    -12px 12px 24px rgba(0, 0, 0, 0.12);

  --origami-shadow-light:
    -3px 3px 0px rgba(26, 26, 26, 0.15);

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  background-color: var(--bg-main);
  background-image: 
    linear-gradient(rgba(26, 26, 26, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 26, 26, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: -1px -1px;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}

/* Hide default cursor on devices with fine pointers for Wing Cursor */
@media (pointer: fine) {
  body {
    cursor: default;
  }
}

#origami-cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 99999;
}

/* Typography & Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  text-transform: uppercase;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.6rem);
}

p {
  color: var(--text-muted);
  font-size: 1rem;
}

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

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

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Origami Geometric Facet Components (Dimensional Tessellation) */
.origami-card {
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  box-shadow: var(--origami-shadow);
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  background-image: 
    linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, transparent 50%),
    linear-gradient(315deg, rgba(0, 0, 0, 0.04) 0%, transparent 50%);
  clip-path: polygon(
    0 0,
    calc(100% - 14px) 0,
    100% 14px,
    100% 100%,
    14px 100%,
    0 calc(100% - 14px)
  );
}

.origami-card:hover {
  transform: translate(3px, -3px);
  box-shadow: var(--origami-shadow-hover);
}

.origami-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 14px;
  height: 14px;
  background: var(--bg-dark);
  clip-path: polygon(0 0, 100% 100%, 0 100%);
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.9rem 1.8rem;
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--border-dark);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.btn-primary {
  background: var(--bg-dark);
  color: var(--bg-main);
  box-shadow: -4px 4px 0px rgba(0,0,0,0.3);
}

.btn-primary:hover {
  background: #2D2D2D;
  color: #FFFFFF;
  transform: translate(2px, -2px);
  box-shadow: -6px 6px 0px rgba(0,0,0,0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  box-shadow: -3px 3px 0px var(--border-dark);
}

.btn-secondary:hover {
  background: #E4E0D6;
  transform: translate(2px, -2px);
  box-shadow: -5px 5px 0px var(--border-dark);
}

.btn-gold {
  background: var(--accent-gold);
  color: #1A1A1A;
  border-color: #1A1A1A;
  box-shadow: -4px 4px 0px #1A1A1A;
}

.btn-gold:hover {
  background: var(--accent-gold-light);
  transform: translate(2px, -2px);
  box-shadow: -6px 6px 0px #1A1A1A;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Badge & Section Tags */
.origami-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--bg-dark);
  color: var(--bg-main);
  border: 1px solid var(--border-dark);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.origami-badge.gold {
  background: var(--accent-gold);
  color: #1A1A1A;
}

/* Navigation Header */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(235, 233, 228, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-dark);
  padding: 1rem 0;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--bg-dark);
  clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-main);
  font-weight: 900;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-main);
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--bg-dark);
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 2px solid var(--border-dark);
  width: 42px;
  height: 42px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.mobile-menu-btn span {
  width: 22px;
  height: 2px;
  background-color: var(--text-main);
  transition: all 0.3s ease;
}

/* Hero Section */
.hero {
  padding: 5rem 0 4rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}

.hero-title {
  margin-top: 0.5rem;
}

.hero-title span.highlight {
  position: relative;
  display: inline-block;
  background: var(--accent-gold);
  color: #1A1A1A;
  padding: 0 0.4rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
}

.coupon-box {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-card);
  border: 2px dashed var(--border-dark);
  padding: 0.6rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  margin-top: 0.5rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

.copy-btn {
  background: var(--bg-dark);
  color: var(--bg-main);
  border: none;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background var(--transition-fast);
}

.copy-btn:hover {
  background: var(--accent-gold);
  color: #1A1A1A;
}

/* Origami Graphic / Model in Hero */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.origami-polyhedron {
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1;
  background: var(--bg-card-alt);
  border: 2px solid var(--border-dark);
  box-shadow: -10px 10px 0px var(--border-dark);
  clip-path: polygon(30% 0%, 70% 0%, 100% 30%, 100% 70%, 70% 100%, 30% 100%, 0% 70%, 0% 30%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  overflow: hidden;
}

.poly-lines {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(30deg, var(--border-dark) 1px, transparent 1px),
    linear-gradient(150deg, var(--border-dark) 1px, transparent 1px),
    linear-gradient(270deg, var(--border-dark) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.15;
}

.hero-stat-card {
  position: absolute;
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  padding: 0.85rem 1.25rem;
  box-shadow: -4px 4px 0px var(--border-dark);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 10;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.hero-stat-card.stat-1 {
  top: 10%;
  left: -5%;
}

.hero-stat-card.stat-2 {
  bottom: 12%;
  right: -5%;
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
}

/* Features Grid */
.features-section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem;
}

.section-header p {
  margin-top: 0.75rem;
  font-size: 1.1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--bg-dark);
  color: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  margin-bottom: 0.5rem;
}

/* Pricing Section */
.pricing-section {
  padding: 5rem 0;
  background: rgba(26, 26, 26, 0.02);
  border-top: 2px solid var(--border-dark);
  border-bottom: 2px solid var(--border-dark);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.price-card {
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  background: var(--bg-card);
}

.price-card.popular {
  background: #FFFDF9;
  border-width: 3px;
  transform: translateY(-8px);
  box-shadow: -8px 8px 0px rgba(26, 26, 26, 1);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--accent-gold);
  color: #1A1A1A;
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border: 2px solid var(--border-dark);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
}

.price-header {
  border-bottom: 2px solid var(--border-subtle);
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
}

.price-name {
  font-size: 1.35rem;
  font-weight: 800;
}

.price-amount {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-top: 0.75rem;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
}

.price-number {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.price-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--text-main);
}

.price-features li svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

/* Node Protocols Section */
.protocol-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 3rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  box-shadow: var(--origami-shadow-light);
}

.protocol-tag {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.4rem 0.9rem;
  background: var(--bg-dark);
  color: var(--bg-main);
}

/* User Reviews Section */
.reviews-section {
  padding: 5rem 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.review-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
}

.review-body {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-main);
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 1rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.author-avatar {
  width: 44px;
  height: 44px;
  background: var(--bg-dark);
  color: var(--bg-main);
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
}

.author-info h4 {
  font-size: 1rem;
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.star-rating {
  color: var(--accent-gold);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* FAQ Accordion Section */
.faq-section {
  padding: 5rem 0;
  background: rgba(26, 26, 26, 0.02);
  border-top: 2px solid var(--border-dark);
}

.faq-wrapper {
  max-width: 860px;
  margin: 3rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.faq-item {
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  box-shadow: -4px 4px 0px var(--border-dark);
  overflow: hidden;
  transition: all var(--transition-fast);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.faq-header {
  padding: 1.4rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  font-weight: 700;
  font-size: 1.1rem;
}

.faq-icon {
  width: 28px;
  height: 28px;
  background: var(--bg-dark);
  color: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--accent-gold);
  color: #1A1A1A;
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 1.8rem;
  background: rgba(0,0,0,0.015);
}

.faq-item.active .faq-content {
  max-height: 400px;
  padding: 0 1.8rem 1.6rem;
  border-top: 1px dashed var(--border-subtle);
}

.faq-content p {
  margin-top: 1rem;
  font-size: 0.98rem;
  line-height: 1.7;
}

/* Articles Section */
.articles-section {
  padding: 5rem 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.article-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
}

.article-card h3 {
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--text-main);
}

.article-card h3 a:hover {
  color: var(--accent-gold-light);
  text-decoration: underline;
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-dim);
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 800;
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-main);
}

.article-link:hover {
  gap: 0.75rem;
}

/* Article Detail Page Layout */
.article-page {
  padding: 3rem 0 5rem;
}

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

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  margin: 1rem 0;
}

.article-body {
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  box-shadow: var(--origami-shadow);
  padding: 3rem 2.5rem;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D2D2C;
}

.article-body h2 {
  font-size: 1.65rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-dark);
}

.article-body h3 {
  font-size: 1.3rem;
  margin: 1.8rem 0 0.8rem;
}

.article-body p {
  margin-bottom: 1.4rem;
  color: #383632;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

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

.article-body blockquote {
  background: rgba(26, 26, 26, 0.05);
  border-left: 4px solid var(--border-dark);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  font-weight: 500;
}

.article-cta-box {
  margin: 3rem 0 2rem;
  padding: 2rem;
  background: var(--bg-dark);
  color: var(--bg-main);
  border: 2px solid var(--border-dark);
  box-shadow: -6px 6px 0px var(--accent-gold);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.article-cta-box h3 {
  color: var(--bg-main);
  font-size: 1.4rem;
}

.article-cta-box p {
  color: #D4D1C9;
}

/* Footer & PBN Links Section */
footer {
  background: var(--bg-dark);
  color: var(--bg-main);
  border-top: 3px solid var(--border-dark);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-brand p {
  color: #A3A096;
  margin-top: 1rem;
  font-size: 0.9rem;
  max-width: 320px;
}

.footer-col h4 {
  color: var(--bg-main);
  font-size: 1rem;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: #C2BFB5;
  font-size: 0.88rem;
}

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

/* PBN Network Links Area (页脚 PBN 权重精准输血管道) */
.pbn-pipeline-section {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  text-align: center;
}

.pbn-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #78756D;
  margin-bottom: 0.8rem;
  font-weight: 700;
}

.pbn-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.6rem 1.2rem;
  list-style: none;
}

.pbn-links li a {
  color: #928E84;
  font-size: 0.78rem;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.pbn-links li a:hover {
  color: var(--accent-gold);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  font-size: 0.8rem;
  color: #78756D;
}

/* Mobile Responsive Adjustments */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-main);
    border-bottom: 2px solid var(--border-dark);
    padding: 1.5rem;
    gap: 1.2rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  }

  .hero {
    padding: 3rem 0;
  }

  .pricing-grid, .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .article-body {
    padding: 1.8rem 1.2rem;
  }
}

/* ==========================================================================
   客户端下载弹窗 (Universal Client Download Modal)
   蓝帆云高维折叠与多面体几何风品牌定制
   ========================================================================== */
body.modal-open {
  overflow: hidden !important;
}

.dl-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999999;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.dl-modal.active {
  display: flex;
}

.dl-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 26, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1;
}

.dl-modal-card {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 540px;
  background: var(--bg-card);
  border: 2px solid var(--border-dark);
  border-top: 5px solid var(--accent-gold);
  padding: 2.2rem 2rem;
  box-shadow: -8px 8px 0px rgba(26, 26, 26, 1), -16px 16px 32px rgba(0, 0, 0, 0.18);
  animation: dlModalFadeIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes dlModalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.dl-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--bg-card-alt);
  color: var(--text-main);
  border: 1.5px solid var(--border-dark);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.dl-modal-close:hover {
  background: var(--accent-gold);
  color: #1A1A1A;
  transform: translate(-1px, -1px);
  box-shadow: -2px 2px 0px var(--border-dark);
}

.dl-modal-header {
  margin-bottom: 1.5rem;
}

.dl-modal-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-gold);
  background: var(--bg-dark);
  border: 1px solid var(--accent-gold);
  margin-bottom: 0.75rem;
  letter-spacing: 1px;
}

.dl-modal-title {
  font-family: var(--font-sans);
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.dl-modal-subtitle {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.dl-plan-alert {
  display: none;
  align-items: center;
  gap: 0.5rem;
  background: rgba(197, 160, 89, 0.15);
  border: 1.5px dashed var(--accent-gold);
  padding: 0.6rem 0.9rem;
  margin-bottom: 1.2rem;
  font-size: 0.86rem;
  color: #5c4415;
  font-weight: 600;
}

.dl-platform-list {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}

.dl-btn {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 1.1rem 1.25rem;
  background: var(--bg-main);
  border: 2px solid var(--border-dark);
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition-fast);
  cursor: pointer;
  box-shadow: -3px 3px 0px var(--border-dark);
}

.dl-btn:hover {
  background: #FFFFFF;
  border-color: var(--border-dark);
  transform: translate(-2px, -2px);
  box-shadow: -5px 5px 0px var(--accent-gold);
}

.dl-btn-icon {
  flex-shrink: 0;
  color: var(--text-main);
}

.dl-btn:hover .dl-btn-icon {
  color: var(--accent-gold);
}

.dl-btn-info {
  flex-grow: 1;
}

.dl-btn-title {
  display: block;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.3;
}

.dl-btn-desc {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.dl-btn-arrow {
  color: var(--accent-gold);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  transition: var(--transition-fast);
}

.dl-btn:hover .dl-btn-arrow {
  transform: translateX(4px);
  color: var(--text-main);
}

.dl-modal-tips {
  background: var(--bg-card-alt);
  border-left: 3px solid var(--accent-gold);
  padding: 0.8rem 1rem;
  margin-bottom: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.dl-tip-item {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.dl-modal-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.dl-footer-link {
  color: var(--accent-gold);
  text-decoration: underline;
  font-weight: 700;
  transition: var(--transition-fast);
}

.dl-footer-link:hover {
  color: var(--text-main);
}

@media (max-width: 600px) {
  .dl-modal-card {
    padding: 1.8rem 1.2rem;
  }
  .dl-modal-title {
    font-size: 1.3rem;
  }
  .dl-btn {
    padding: 0.9rem 1rem;
    gap: 0.8rem;
  }
}