/* ==========================================================================
   uuone.sbs - Apple Aesthetic Core Stylesheet
   Design Philosophy: Ultra minimalism, extreme negative space, massive sans-serif typography,
   soft ambient glows, 28px super-rounded corners, translucent frosted glass cards.
   ========================================================================== */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --bg-color: #f5f5f7;
  --card-bg: rgba(255, 255, 255, 0.82);
  --card-solid-bg: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #a1a1a6;
  --accent-blue: #0071e3;
  --accent-blue-hover: #0077ed;
  --accent-blue-light: rgba(0, 113, 227, 0.08);
  --accent-green: #34c759;
  --accent-orange: #ff9500;
  --border-light: rgba(0, 0, 0, 0.06);
  --border-glass: rgba(255, 255, 255, 0.5);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --radius-pill: 9999px;
  --shadow-ambient: 0 20px 40px -15px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 30px 60px -12px rgba(0, 113, 227, 0.12);
  --backdrop-blur: blur(20px) saturate(180%);
  --transition-smooth: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  overflow-x: hidden;
  position: relative;
  line-height: 1.5;
  background-color: var(--bg-color);
}

/* Ambient Environmental Glow background overlays */
.ambient-glow-1 {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 113, 227, 0.12) 0%, rgba(52, 199, 89, 0.04) 45%, rgba(245, 245, 247, 0) 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.ambient-glow-2 {
  position: absolute;
  top: 1400px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(175, 82, 222, 0.08) 0%, rgba(0, 113, 227, 0.05) 50%, rgba(245, 245, 247, 0) 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

/* Base Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Navigation Header */
header.apple-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(245, 245, 247, 0.75);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.logo-brand {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-badge {
  font-size: 11px;
  font-weight: 600;
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  padding: 3px 8px;
  border-radius: var(--radius-pill);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.nav-link:hover {
  color: var(--accent-blue);
}

/* Apple Buttons */
.btn-apple-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.3);
  border: none;
  cursor: pointer;
}

.btn-apple-primary:hover {
  background: var(--accent-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 113, 227, 0.4);
}

.btn-apple-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 113, 227, 0.08);
  color: var(--accent-blue);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: var(--transition-smooth);
  border: 1px solid rgba(0, 113, 227, 0.15);
  cursor: pointer;
}

.btn-apple-secondary:hover {
  background: rgba(0, 113, 227, 0.15);
  transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
  padding-top: 160px;
  padding-bottom: 90px;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.9);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.hero-tag .dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
  100% { opacity: 1; transform: scale(1); }
}

.hero-title {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -1.8px;
  color: var(--text-primary);
  max-width: 900px;
  margin: 0 auto 24px;
}

.hero-title span {
  background: linear-gradient(135deg, #0071e3 0%, #409cff 50%, #af52de 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 21px;
  font-weight: 400;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.45;
  letter-spacing: -0.3px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border-light);
}

.stat-item .num {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.stat-item .label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Section Common Titles */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-caption {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--text-primary);
  line-height: 1.15;
}

.section-description {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 12px auto 0;
}

/* Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 100px;
}

.bento-card {
  background: var(--card-bg);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-ambient);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  position: relative;
}

.bento-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(0, 113, 227, 0.2);
}

.bento-card.span-2 {
  grid-column: span 2;
}

.bento-card.span-3 {
  grid-column: span 3;
}

.bento-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 24px;
}

.bento-card h3 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.bento-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Speed Simulator Component */
.speed-test-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-ambient);
  margin-bottom: 100px;
}

.nodes-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.node-card {
  background: var(--bg-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border-light);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 24px;
}

.node-name {
  font-weight: 600;
  font-size: 15px;
}

.node-type {
  font-size: 12px;
  color: var(--text-secondary);
}

.node-ping {
  font-family: monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-green);
  background: rgba(52, 199, 89, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

/* Pricing Grid Section */
.pricing-section {
  margin-bottom: 120px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.price-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-ambient);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
  position: relative;
}

.price-card.featured {
  border: 2px solid var(--accent-blue);
  box-shadow: 0 20px 40px rgba(0, 113, 227, 0.15);
  transform: scale(1.03);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-blue);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
}

.price-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.price-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 38px;
}

.price-val {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.price-val span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.price-features {
  list-style: none;
  margin-bottom: 32px;
}

.price-features li {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.price-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* User Reviews Section */
.reviews-section {
  margin-bottom: 120px;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-ambient);
}

.review-stars {
  color: #ffcc00;
  margin-bottom: 16px;
  font-size: 16px;
}

.review-content {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.author-name {
  font-weight: 600;
  font-size: 14px;
}

.author-role {
  font-size: 12px;
  color: var(--text-secondary);
}

/* FAQ Accordion */
.faq-section {
  margin-bottom: 120px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-question {
  width: 100%;
  padding: 24px;
  font-size: 17px;
  font-weight: 600;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
}

.faq-icon {
  transition: transform 0.3s ease;
  font-size: 20px;
  color: var(--text-secondary);
}

.faq-answer {
  padding: 0 24px 24px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: none;
}

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

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* SEO Article Section */
.articles-section {
  margin-bottom: 120px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.article-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 24px;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-ambient);
  border-color: rgba(0, 113, 227, 0.2);
}

.article-category {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.article-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.article-snippet {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.article-meta {
  font-size: 12px;
  color: var(--text-tertiary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Article Template (Inner Pages) */
.article-page {
  padding-top: 120px;
  padding-bottom: 100px;
}

.article-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}

.article-tag {
  display: inline-block;
  background: var(--accent-blue-light);
  color: var(--accent-blue);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.article-main-title {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 20px;
}

.article-date-meta {
  font-size: 14px;
  color: var(--text-secondary);
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 56px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-ambient);
}

.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: #2c2c2e;
}

.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content a {
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dashed var(--accent-blue);
}

.article-content a:hover {
  border-bottom-style: solid;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(0, 113, 227, 0.05) 0%, rgba(52, 199, 89, 0.05) 100%);
  border: 1px solid rgba(0, 113, 227, 0.15);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}

.article-cta-box h4 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.article-cta-box p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* Footer & PBN Infusion Area */
footer.apple-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 40px;
  margin-top: 100px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
}

.footer-col h5 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

/* Low-Key Integrated PBN Friend Links Section (要求：小字号、融入现有页脚、隐蔽精准) */
.pbn-links-area {
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

.pbn-links-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.pbn-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  list-style: none;
}

.pbn-links-grid a {
  color: #98989d;
  text-decoration: none;
  font-size: 11px;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
  padding-top: 20px;
}

/* Canvas Trail Overlay */
#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* Mobile Nav Toggle Button */
.nav-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1001;
  transition: var(--transition-smooth);
}

.nav-toggle-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.nav-toggle-icon {
  width: 22px;
  height: 14px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

.nav-toggle-btn[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle-btn[aria-expanded="true"] .nav-toggle-icon span:nth-child(2) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Modal Overlay & Dialog Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  height: 100vh;
  height: 100dvh;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  padding-bottom: max(16px, env(safe-area-inset-bottom));
  padding-top: max(16px, env(safe-area-inset-top));
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  overflow-y: auto;
  box-sizing: border-box;
}

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

.modal-dialog {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 480px;
  max-height: calc(100dvh - 32px);
  max-height: calc(100vh - 32px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  transform: scale(0.95) translateY(10px);
  transition: transform 0.25s cubic-bezier(0.25, 1, 0.5, 1);
  box-sizing: border-box;
}

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

.modal-header {
  padding: 24px 24px 16px;
  position: relative;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.modal-header-text {
  padding-right: 16px;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 6px;
}

.modal-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-close-btn {
  background: rgba(0, 0, 0, 0.05);
  border: none;
  width: 36px;
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.modal-close-btn:hover {
  background: rgba(0, 0, 0, 0.1);
  color: var(--text-primary);
}

.modal-close-btn:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.platform-buttons-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 20px;
}

.btn-platform {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  background: #f8f9fa;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  min-height: 60px;
  box-sizing: border-box;
  transition: var(--transition-smooth);
}

.btn-platform:hover {
  border-color: var(--accent-blue);
  background: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.1);
  transform: translateY(-2px);
}

.btn-platform:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.platform-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 14px;
  flex-shrink: 0;
}

.platform-icon svg {
  width: 28px;
  height: 28px;
}

.platform-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  text-align: left;
}

.platform-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.platform-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.platform-action-arrow {
  color: var(--accent-blue);
  font-size: 18px;
  font-weight: 700;
  margin-left: 8px;
  flex-shrink: 0;
}

.modal-fallback-link {
  font-size: 13px;
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  margin-top: 8px;
}

.modal-fallback-link:hover {
  text-decoration: underline;
}

.modal-footer {
  padding: 14px 24px;
  background: #fbfbfd;
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-tertiary);
  text-align: center;
  line-height: 1.5;
}

/* Download Page Specific Styling */
.download-page {
  padding-top: 120px;
  padding-bottom: 100px;
}

.download-hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 48px;
}

.download-hero-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.download-hero-subtitle {
  font-size: clamp(15px, 2.5vw, 18px);
  color: var(--text-secondary);
  line-height: 1.6;
}

.download-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.download-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 36px 28px;
  box-shadow: var(--shadow-ambient);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  align-items: center;
}

.download-card-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card-icon svg {
  width: 48px;
  height: 48px;
}

.download-card-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}

.download-card-meta {
  width: 100%;
  background: #fbfbfd;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
}

.download-steps-section {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 40px;
  box-shadow: var(--shadow-ambient);
  margin-bottom: 48px;
}

.download-steps-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
}

.step-flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-card {
  background: #fbfbfd;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
}

.step-number {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Mobile Responsive Adjustments */
@media (max-width: 992px) {
  .hero-title {
    font-size: clamp(36px, 6vw, 48px);
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card.span-2, .bento-card.span-3 {
    grid-column: span 1;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr repeat(2, 1fr);
  }
  .download-cards-grid {
    grid-template-columns: 1fr;
  }
  .step-flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .apple-nav {
    height: 56px;
  }
  .nav-toggle-btn {
    display: inline-flex;
  }
  .nav-inner {
    position: relative;
  }
  .nav-menu {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border-bottom: 1px solid var(--border-light);
    flex-direction: column;
    padding: 20px 24px 28px;
    gap: 16px;
    align-items: flex-start;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.08);
    display: none;
    max-height: calc(100vh - 56px);
    max-height: calc(100dvh - 56px);
    overflow-y: auto;
  }
  .nav-menu.active {
    display: flex;
  }
  .nav-menu li {
    width: 100%;
  }
  .nav-link {
    font-size: 16px;
    padding: 8px 0;
    display: block;
    width: 100%;
    color: var(--text-primary);
  }
  .nav-inner .btn-apple-primary {
    font-size: 13px;
    padding: 8px 16px;
    min-height: 38px;
  }
  .hero-section {
    padding-top: 100px;
    padding-bottom: 60px;
  }
  .hero-title {
    font-size: clamp(28px, 7vw, 38px);
    letter-spacing: -0.8px;
    margin-bottom: 16px;
  }
  .hero-subtitle {
    font-size: clamp(15px, 3.8vw, 17px);
    margin-bottom: 28px;
  }
  .hero-actions {
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 36px;
  }
  .hero-actions .btn-apple-primary,
  .hero-actions .btn-apple-secondary {
    width: 100%;
    min-height: 48px;
    font-size: 16px;
    box-sizing: border-box;
  }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 24px;
    padding-top: 20px;
  }
  .stat-item .num {
    font-size: 26px;
  }
  .stat-item .label {
    font-size: 12px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .price-card {
    padding: 28px 20px;
  }
  .price-card.featured {
    transform: none;
  }
  .price-val {
    font-size: 32px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .article-page {
    padding-top: 80px;
    padding-bottom: 60px;
  }
  .article-container {
    padding: 24px 18px;
  }
  .article-header {
    margin-bottom: 24px;
  }
  .article-main-title {
    font-size: clamp(22px, 5.5vw, 28px);
  }
  .article-content {
    font-size: 16px;
    line-height: 1.7;
    word-break: break-word;
    overflow-wrap: break-word;
  }
  .article-content ul, .article-content ol {
    margin-left: 20px;
  }
  .article-cta-box {
    padding: 24px 16px;
    margin: 32px 0;
  }
  .step-flow-grid {
    grid-template-columns: 1fr;
  }
  .download-steps-section {
    padding: 24px 18px;
  }
  .speed-test-box {
    padding: 20px 16px;
  }
  .container {
    padding: 0 16px;
  }
  .ambient-glow-1, .ambient-glow-2 {
    display: none;
  }
}

@media (max-width: 480px) {
  .logo-brand {
    font-size: 19px;
  }
  .hero-tag {
    font-size: 12px;
    padding: 5px 12px;
    white-space: normal;
    text-align: center;
  }
  .modal-dialog {
    border-radius: var(--radius-md);
  }
  .modal-header {
    padding: 18px 16px 14px;
  }
  .modal-body {
    padding: 16px;
  }
  .btn-platform {
    padding: 12px 14px;
  }
  .pbn-links-grid {
    gap: 8px 14px;
  }
}