/* ==========================================================================
   蓝帆云 (Lanfan Cloud) - Anechoic Chamber Minimal Design System
   Theme: 全消音暗室与绝对静音风 (Anechoic Chamber Minimal)
   Primary Color: #121214 (Matte Sound-Absorbing Charcoal Gray)
   Typography: Zero-noise high-contrast monochrome
   ========================================================================== */

:root {
  --bg-dark: #121214;
  --bg-card: #18181c;
  --bg-card-hover: #202026;
  --bg-elevated: #26262e;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 255, 255, 0.3);
  
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-inverse: #09090b;

  --accent-silver: #e4e4e7;
  --accent-white: #ffffff;
  --accent-dark: #27272a;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
  
  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --max-width: 1240px;
}

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

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

body {
  overflow-x: hidden;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
}

/* Custom Cursor Trail (鼠标换尾翼) */
#custom-cursor-wing {
  position: fixed;
  top: 0;
  left: 0;
  width: 24px;
  height: 24px;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.08s ease-out, opacity 0.2s ease;
}

#custom-cursor-wing svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--accent-white);
  stroke-width: 1.5;
  filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.3));
}

.cursor-trail-dot {
  position: fixed;
  pointer-events: none;
  z-index: 9998;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s, opacity 0.3s ease-out;
}

/* Acoustic Chamber Geometry Texture (消音暗室与吸音尖劈背景) */
.acoustic-bg {
  background-color: var(--bg-dark);
  background-image: 
    linear-gradient(135deg, rgba(255, 255, 255, 0.02) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255, 255, 255, 0.02) 25%, transparent 25%),
    linear-gradient(45deg, rgba(255, 255, 255, 0.02) 25%, transparent 25%),
    linear-gradient(315deg, rgba(255, 255, 255, 0.02) 25%, var(--bg-dark) 25%);
  background-position: 20px 0, 20px 0, 0 0, 0 0;
  background-size: 40px 40px;
  background-repeat: repeat;
}

/* Sound-Absorbing Wedge Card Effect (吸音尖劈卡片) */
.acoustic-wedge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), background-color var(--transition-normal);
}

.acoustic-wedge-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #27272a, #71717a, #27272a);
  opacity: 0.5;
  transition: opacity var(--transition-normal);
}

.acoustic-wedge-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  background-color: var(--bg-card-hover);
}

.acoustic-wedge-card:hover::before {
  opacity: 1;
}

/* Acoustic 3D Texture pattern overlay for special cards */
.acoustic-pattern-overlay {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    45deg,
    #fff,
    #fff 2px,
    transparent 2px,
    transparent 12px
  );
}

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

/* Typography & Utilities */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }

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

.text-gradient {
  background: linear-gradient(180deg, #ffffff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-mono {
  font-family: var(--font-mono);
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tag-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-white);
}

/* Button Styles - High Contrast Zero Glow */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background-color: #e4e4e7;
  border-color: #e4e4e7;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.06);
  border-color: var(--border-focus);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* Header & Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(18, 18, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  height: 72px;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-icon svg {
  width: 18px;
  height: 18px;
  fill: var(--text-primary);
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 10rem 0 6rem;
  position: relative;
  text-align: center;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.hero-title {
  margin: 1.5rem 0 1.25rem;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 3rem;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  letter-spacing: -0.04em;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Features Grid - Acoustic Wedges */
.section {
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 4rem;
}

.section-title {
  margin-top: 0.75rem;
  margin-bottom: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  padding: 2.25rem;
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.feature-icon-wrapper svg {
  width: 24px;
  height: 24px;
  stroke: var(--text-primary);
}

.feature-title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.feature-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Pricing Section */
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 2.5rem 0 3.5rem;
}

.pricing-toggle-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.pricing-toggle-label.active {
  color: var(--text-primary);
  font-weight: 600;
}

.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--bg-card-hover);
  border: 1px solid var(--border-subtle);
  transition: 0.3s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--text-primary);
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--bg-elevated);
  border-color: var(--border-focus);
}

input:checked + .slider:before {
  transform: translateX(24px);
}

.save-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  margin-left: 0.5rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.pricing-card {
  padding: 2.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.pricing-card.featured {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
}

.pricing-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  background: var(--text-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.pricing-name {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.pricing-price {
  margin: 1.25rem 0;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 600;
}

.price-amount {
  font-size: 2.75rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.04em;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 1.5rem 0 2rem;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.pricing-features li svg {
  width: 16px;
  height: 16px;
  stroke: var(--text-primary);
  flex-shrink: 0;
}

/* Matrix Table Comparison */
.comparison-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  margin-top: 2.5rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table th {
  background: var(--bg-elevated);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: var(--bg-card-hover);
}

.comparison-table .highlight-row {
  background: rgba(255, 255, 255, 0.03);
  font-weight: 600;
}

.check-icon {
  color: var(--accent-white);
  font-weight: bold;
}

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

/* Article Cards Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.article-tag {
  color: var(--text-primary);
  font-weight: 600;
  font-family: var(--font-mono);
}

.article-title {
  font-size: 1.25rem;
  margin-bottom: 0.85rem;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title {
  color: var(--accent-silver);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.article-read-more svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.article-card:hover .article-read-more svg {
  transform: translateX(4px);
}

/* User Reviews (用户评价) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.review-card {
  padding: 2rem;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.user-info h4 {
  font-size: 1rem;
  margin-bottom: 0.15rem;
}

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

.rating-stars {
  color: #fff;
  letter-spacing: 2px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.review-content {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

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

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

.faq-item:hover {
  border-color: var(--border-focus);
}

.faq-question {
  width: 100%;
  padding: 1.5rem 1.75rem;
  background: none;
  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-question svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-secondary);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  stroke: var(--text-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  padding: 0 1.75rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.75rem 1.5rem;
}

/* Article Template Custom Page Styles */
.article-header {
  padding: 9rem 0 3rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body-wrapper {
  padding: 4rem 0 6rem;
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-content h2 {
  font-size: 1.75rem;
  color: var(--text-primary);
  margin: 2.5rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin: 2rem 0 1rem;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content ul, .article-content ol {
  margin: 1.25rem 0 1.5rem 2rem;
  color: var(--text-secondary);
}

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

.article-content blockquote {
  border-left: 3px solid var(--text-primary);
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  margin: 1.75rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-primary);
}

.article-content a {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-cta-box {
  background: var(--bg-card);
  border: 1px solid var(--border-focus);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  text-align: center;
  margin: 3.5rem 0;
}

.article-cta-box h3 {
  margin-bottom: 0.75rem;
}

.article-cta-box p {
  margin-bottom: 1.5rem;
}

/* Footer & PBN Footprint Links (页脚 PBN 权重管道) */
.footer {
  background: #0b0b0d;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  font-size: 0.85rem;
  margin-top: 0.85rem;
  color: var(--text-muted);
  max-width: 320px;
}

.footer-column h4 {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Footprint PBN Pipe (页脚 PBN 友情链接区) */
.footer-pbn-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  margin-top: 2rem;
}

.pbn-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  text-align: center;
}

.pbn-links-flex {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem 1.5rem;
  list-style: none;
  font-size: 0.8rem;
}

.pbn-links-flex a {
  color: #71717a;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  text-align: center;
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-subtle);
    padding: 2rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    display: none;
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .hero {
    padding: 7rem 0 4rem;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
  }
}

/* ==========================================================================
   Download Modal Dialog (下载弹窗 - 绝对静音暗室风格)
   ========================================================================== */
body.modal-open {
  overflow: hidden !important;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 12, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.94) translateY(12px);
  transition: transform var(--transition-bounce), opacity var(--transition-normal);
  padding: 2.25rem 2rem;
}

.modal-backdrop.active .modal-dialog {
  transform: scale(1) translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover,
.modal-close-btn:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  border-color: var(--border-focus);
  outline: none;
}

.modal-header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.modal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.85rem;
  margin-bottom: 0.85rem;
}

.modal-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Selected Plan Hint inside modal */
.modal-plan-hint {
  display: none;
  background: rgba(255, 255, 255, 0.04);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-primary);
  align-items: center;
  justify-content: space-between;
}

.modal-plan-hint.active {
  display: flex;
}

.modal-plan-hint .plan-tag {
  color: #a1a1aa;
}

.modal-plan-hint .plan-name-val {
  font-weight: 600;
  color: var(--accent-white);
}

/* Download Action Buttons (Android & iOS Only) */
.modal-downloads {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.modal-download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.25rem;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.modal-download-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--text-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.modal-download-card:hover,
.modal-download-card:focus-visible {
  border-color: var(--border-focus);
  background: var(--bg-elevated);
  transform: translateY(-2px);
  outline: none;
}

.modal-download-card:hover::after,
.modal-download-card:focus-visible::after {
  opacity: 1;
}

.modal-download-card.highlight {
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.06);
}

.modal-download-card.highlight .rec-badge {
  display: inline-block;
}

.download-card-main {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.download-os-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.download-os-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.download-os-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.rec-badge {
  display: none;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.15);
  color: var(--accent-white);
}

.download-os-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.download-action-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.modal-download-card:hover .download-action-btn,
.modal-download-card:focus-visible .download-action-btn {
  background: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
}

.modal-steps-guide {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  margin-bottom: 1.5rem;
}

.modal-steps-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.modal-steps-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.modal-steps-list li {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.45;
}

.modal-steps-list li span.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.modal-footer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.modal-footer a {
  color: var(--text-secondary);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.modal-footer a:hover {
  color: var(--text-primary);
}

/* Download Hub Page Additional Styling */
.download-hero {
  padding: 8rem 0 3.5rem;
  text-align: center;
}

.download-grid-center {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 860px;
  margin: 2.5rem auto 0;
}

.guide-step-card {
  padding: 2rem;
  border-radius: var(--radius-md);
}

.guide-step-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.12);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}