/* ==========================================================================
   Flywarp 飞梭 - Neo-Brutalist & Playful High-Conversion Design System
   Domain: Flywarp.homes
   Style Reference: Playful Retro Pop + Neo-Brutalism (Bold Borders, Hard Shadows)
   ========================================================================== */

:root {
  --bg-primary: #2ac4ba;
  --bg-secondary: #f4f7f6;
  --bg-card: #ffffff;
  --bg-dark: #0f172a;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  
  /* Pop Accent Palette */
  --coral-accent: #ff6b6b;
  --yellow-accent: #ffd152;
  --cyan-accent: #2ac4ba;
  --purple-accent: #8b5cf6;
  --green-accent: #10b981;
  
  /* Brutalist Shadows & Borders */
  --border-thick: 2.5px solid #0f172a;
  --border-thin: 1.5px solid #0f172a;
  --shadow-hard: 4px 4px 0px #0f172a;
  --shadow-hard-lg: 6px 6px 0px #0f172a;
  --shadow-hard-coral: 4px 4px 0px #ff6b6b;
  --shadow-hard-yellow: 4px 4px 0px #ffd152;
  --radius-card: 16px;
  --radius-btn: 12px;
  --radius-badge: 9999px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Neo-Brutalist Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-btn);
  border: var(--border-thick);
  box-shadow: var(--shadow-hard);
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  text-align: center;
  white-space: nowrap;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px #0f172a;
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px #0f172a;
}

.btn-primary {
  background-color: var(--green-accent);
  color: #ffffff;
}

.btn-yellow {
  background-color: var(--yellow-accent);
  color: var(--text-main);
}

.btn-coral {
  background-color: var(--coral-accent);
  color: #ffffff;
}

.btn-white {
  background-color: #ffffff;
  color: var(--text-main);
}

.btn-dark {
  background-color: var(--bg-dark);
  color: #ffffff;
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  box-shadow: 3px 3px 0px #0f172a;
}

.btn-lg {
  padding: 1.1rem 2.2rem;
  font-size: 1.125rem;
  border-radius: 14px;
}

/* Dynamic Floating Animation & Badges */
@keyframes floatSlow {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-8px) rotate(1.5deg);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.95);
  }
}

.float-anim {
  animation: floatSlow 4s ease-in-out infinite;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-badge);
  border: var(--border-thin);
  box-shadow: 2px 2px 0px #0f172a;
}

.badge-yellow { background-color: var(--yellow-accent); }
.badge-coral { background-color: var(--coral-accent); color: #fff; }
.badge-green { background-color: #d1fae5; color: #065f46; border-color: #065f46; }
.badge-white { background-color: #fff; }

/* Pulse dot */
.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.3);
  animation: pulseGlow 1.8s infinite;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #ffffff;
  border-bottom: var(--border-thick);
  padding: 0.9rem 0;
  box-shadow: 0 4px 0px rgba(15, 23, 42, 0.08);
}

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

.logo-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.5px;
}

.logo-icon-box {
  width: 38px;
  height: 38px;
  background-color: var(--yellow-accent);
  border: var(--border-thick);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 3px 3px 0px #0f172a;
  font-size: 1.2rem;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  transition: all 0.15s ease;
}

.nav-link:hover {
  background-color: #f1f5f9;
  color: var(--coral-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mobile-menu-btn {
  display: none;
  background: #ffffff;
  border: var(--border-thick);
  border-radius: 8px;
  padding: 0.5rem;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: 2px 2px 0px #0f172a;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 3.5rem 0 4.5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

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

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #ffffff;
  border: var(--border-thick);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-badge);
  box-shadow: var(--shadow-hard);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.2rem;
  color: #0f172a;
}

.hero-title .highlight-yellow {
  background-color: var(--yellow-accent);
  padding: 0.1rem 0.45rem;
  border: var(--border-thick);
  border-radius: 8px;
  display: inline-block;
  box-shadow: 3px 3px 0px #0f172a;
  transform: rotate(-1deg);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: #1e293b;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 1.8rem;
  max-width: 580px;
  background-color: rgba(255, 255, 255, 0.85);
  padding: 0.8rem 1.2rem;
  border-radius: 12px;
  border: var(--border-thin);
}

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

.hero-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  list-style: none;
  font-size: 0.9rem;
  font-weight: 700;
  color: #0f172a;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: #ffffff;
  padding: 0.3rem 0.75rem;
  border-radius: 8px;
  border: var(--border-thin);
  box-shadow: 2px 2px 0px #0f172a;
}

/* Hero Visual Card (Style Inspired by Image 1) */
.hero-visual-card {
  background-color: #ffffff;
  border: 3.5px solid #0f172a;
  border-radius: 20px;
  padding: 1.8rem;
  box-shadow: 8px 8px 0px #ff6b6b, 8px 8px 0px 3px #0f172a;
  position: relative;
  transition: transform 0.2s ease;
}

.hero-visual-card:hover {
  transform: translateY(-4px);
}

.sticker-pack {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.sticker-square {
  width: 48px;
  height: 48px;
  border: 3px solid #0f172a;
  border-radius: 10px;
  box-shadow: 3px 3px 0px #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 900;
}

.sticker-coral { background-color: var(--coral-accent); color: #fff; }
.sticker-yellow { background-color: var(--yellow-accent); }
.sticker-teal { background-color: var(--cyan-accent); color: #fff; }

.visual-headline {
  font-size: 1.7rem;
  font-weight: 900;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
}

.visual-sub {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

/* Latency Checker Simulator */
.node-ping-box {
  background-color: #f8fafc;
  border: var(--border-thin);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1.2rem;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dashed #cbd5e1;
  font-size: 0.85rem;
  font-weight: 600;
}

.node-row:last-child {
  border-bottom: none;
}

.ping-tag {
  color: #059669;
  font-weight: 800;
  font-family: monospace;
}

/* ==========================================================================
   Section Common Layout
   ========================================================================== */
.section {
  padding: 4.5rem 0;
}

.section-white {
  background-color: #ffffff;
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
}

.section-light {
  background-color: var(--bg-secondary);
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
}

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

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-badge);
  background-color: var(--yellow-accent);
  border: var(--border-thick);
  box-shadow: 2px 2px 0px #0f172a;
  margin-bottom: 0.8rem;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Core Advantages (优势)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}

.feature-card {
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: var(--radius-card);
  padding: 1.8rem;
  box-shadow: var(--shadow-hard);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0px #0f172a;
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  border: var(--border-thick);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.2rem;
  box-shadow: 3px 3px 0px #0f172a;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
}

.feature-text {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Pricing Section (图2 还原)
   ========================================================================== */
.pricing-section {
  background-color: #ffffff;
  border-top: var(--border-thick);
  border-bottom: var(--border-thick);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background-color: #ffffff;
  border: 2px solid #e2e8f0;
  border-radius: 16px;
  padding: 2.2rem 1.8rem;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hard-lg);
  border: var(--border-thick);
}

/* Featured / Professional Plan (Matching Image 2 highlight) */
.pricing-card.featured {
  border: 3px solid #14b8a6;
  box-shadow: 0 10px 25px -5px rgba(20, 184, 166, 0.25);
  position: relative;
}

.pricing-card.featured::before {
  content: "人气推荐 · 畅快首选";
  position: absolute;
  top: -14px;
  right: 20px;
  background-color: #14b8a6;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1.5px solid #0f172a;
  box-shadow: 2px 2px 0px #0f172a;
}

.plan-icon-top {
  font-size: 1.5rem;
  margin-bottom: 0.8rem;
  color: #0f172a;
}

.plan-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: #0f172a;
  margin-bottom: 0.8rem;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
  margin-bottom: 1.5rem;
}

.currency-sym {
  font-size: 1.25rem;
  font-weight: 700;
  color: #0f172a;
}

.price-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
}

.price-cycle {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.2rem;
}

.features-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.plan-features-list {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: #334155;
  margin-bottom: 0.75rem;
  line-height: 1.45;
}

.plan-feature-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: #14b8a6;
}

.plan-action-btn {
  width: 100%;
  background-color: #14b8a6;
  color: #ffffff;
  border: var(--border-thick);
  border-radius: 12px;
  padding: 0.9rem;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 3px 3px 0px #0f172a;
  transition: all 0.15s ease;
  text-align: center;
}

.plan-action-btn:hover {
  background-color: #0d9488;
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0px #0f172a;
}

/* ==========================================================================
   Knowledge Base & Articles (文章知识库)
   ========================================================================== */
.articles-section {
  background-color: var(--bg-secondary);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.8rem;
}

.article-card {
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: var(--radius-card);
  padding: 1.6rem;
  box-shadow: var(--shadow-hard);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  position: relative;
}

.article-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0px #0f172a;
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.9rem;
}

.article-badge {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: var(--border-thin);
}

.article-read-time {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.article-title-link {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  transition: color 0.15s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-title-link:hover {
  color: var(--coral-accent);
}

.article-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.2rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed #e2e8f0;
  padding-top: 0.9rem;
  font-size: 0.85rem;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-pill {
  background-color: #f1f5f9;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #475569;
}

.article-arrow {
  font-weight: 800;
  color: var(--coral-accent);
}

/* ==========================================================================
   FAQ Section (常见问题)
   ========================================================================== */
.faq-section {
  background-color: #ffffff;
  border-top: var(--border-thick);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: 14px;
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-question-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 800;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-icon-arrow {
  font-size: 1.2rem;
  font-weight: 900;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background-color: #f8fafc;
  border-top: 1px dashed transparent;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  transition: max-height 0.3s ease-in-out;
  border-top: 1px dashed #cbd5e1;
}

.faq-answer-inner {
  padding: 1.25rem 1.5rem;
  font-size: 0.95rem;
  color: #334155;
  line-height: 1.65;
}

/* ==========================================================================
   Client Downloads Bar
   ========================================================================== */
.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}

.download-card {
  background: #ffffff;
  border: var(--border-thick);
  border-radius: 14px;
  padding: 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-hard);
  transition: all 0.2s ease;
}

.download-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px #0f172a;
}

.download-os-icon {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.download-os-name {
  font-weight: 800;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.download-os-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   CTA Banner (免费注册)
   ========================================================================== */
.cta-banner-section {
  padding: 5rem 0;
}

.cta-banner-box {
  background-color: var(--yellow-accent);
  border: 3.5px solid #0f172a;
  border-radius: 24px;
  padding: 3.5rem 2.5rem;
  box-shadow: 8px 8px 0px #0f172a;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-title {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.cta-desc {
  font-size: 1.15rem;
  font-weight: 600;
  color: #1e293b;
  max-width: 650px;
  margin: 0 auto 2rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-dark);
  color: #f1f5f9;
  padding: 4.5rem 0 2rem;
  border-top: var(--border-thick);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.footer-brand-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: #94a3b8;
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.footer-col-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 1.2rem;
  border-left: 4px solid var(--yellow-accent);
  padding-left: 0.6rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  color: #94a3b8;
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

.footer-link:hover {
  color: var(--yellow-accent);
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: #64748b;
}

/* ==========================================================================
   Article Detail Page Styles
   ========================================================================== */
.article-header-wrapper {
  background-color: #ffffff;
  border-bottom: var(--border-thick);
  padding: 3rem 0 2.5rem;
}

.breadcrumb-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.breadcrumb-nav a {
  color: var(--text-main);
}

.breadcrumb-nav a:hover {
  color: var(--coral-accent);
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.3;
  margin-bottom: 1.2rem;
}

.article-info-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #64748b;
}

.article-body-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
  padding: 3rem 0 5rem;
}

/* Sidebar Sticky TOC */
.sidebar-toc {
  position: sticky;
  top: 90px;
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: var(--radius-card);
  padding: 1.4rem;
  box-shadow: var(--shadow-hard);
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: var(--border-thin);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.toc-link {
  color: #475569;
  font-weight: 600;
  transition: color 0.15s ease;
  display: block;
}

.toc-link:hover {
  color: var(--coral-accent);
}

/* Content Area */
.article-content-card {
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: var(--radius-card);
  padding: 2.8rem 2.2rem;
  box-shadow: var(--shadow-hard-lg);
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #1e293b;
}

.article-prose h2 {
  font-size: 1.65rem;
  font-weight: 900;
  color: #0f172a;
  margin-top: 2.4rem;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2.5px solid #0f172a;
}

.article-prose h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #0f172a;
  margin-top: 1.8rem;
  margin-bottom: 0.75rem;
}

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

.article-prose ul, .article-prose ol {
  margin-bottom: 1.4rem;
  padding-left: 1.6rem;
}

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

/* Callout Box */
.callout-box {
  background-color: #f0fdf4;
  border: var(--border-thick);
  border-left: 6px solid #10b981;
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  margin: 1.8rem 0;
  box-shadow: 3px 3px 0px #0f172a;
}

.callout-warning {
  background-color: #fffbeb;
  border-left-color: #f59e0b;
}

.callout-title {
  font-weight: 800;
  margin-bottom: 0.4rem;
  color: #0f172a;
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 1.8rem 0;
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  border: var(--border-thick);
  background-color: #ffffff;
}

.custom-table th, .custom-table td {
  padding: 0.85rem 1rem;
  border: 1px solid #cbd5e1;
  text-align: left;
  font-size: 0.9rem;
}

.custom-table th {
  background-color: #f1f5f9;
  font-weight: 800;
  color: #0f172a;
}

/* Article Affiliate CTA Box */
.article-cta-box {
  background-color: var(--yellow-accent);
  border: var(--border-thick);
  border-radius: 16px;
  padding: 2rem;
  margin: 2.5rem 0;
  text-align: center;
  box-shadow: var(--shadow-hard);
}

.article-cta-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.article-cta-text {
  font-size: 0.95rem;
  color: #334155;
  margin-bottom: 1.2rem;
}

/* User Reviews Section */
.reviews-container {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: var(--border-thick);
}

.reviews-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 1.5rem;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
}

.review-card {
  background-color: #f8fafc;
  border: var(--border-thin);
  border-radius: 12px;
  padding: 1.2rem;
  box-shadow: 2px 2px 0px #0f172a;
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.reviewer-name {
  font-weight: 800;
  font-size: 0.95rem;
}

.review-stars {
  color: #f59e0b;
  font-size: 0.85rem;
}

.review-body {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.5;
}

.review-tag {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: #059669;
  font-weight: 700;
}

/* Internal Linking Grid */
.internal-links-box {
  background-color: #ffffff;
  border: var(--border-thick);
  border-radius: 16px;
  padding: 1.8rem;
  margin-top: 3rem;
  box-shadow: var(--shadow-hard);
}

.internal-links-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.internal-links-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.8rem;
  list-style: none;
}

.internal-link-item a {
  display: block;
  padding: 0.6rem 0.8rem;
  background-color: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 700;
  color: #334155;
  transition: all 0.15s ease;
}

.internal-link-item a:hover {
  border-color: #0f172a;
  background-color: #f1f5f9;
  color: var(--coral-accent);
  transform: translateX(3px);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-subtitle {
    margin: 0 auto 1.8rem;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-list {
    justify-content: center;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-toc {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu, .nav-actions .btn-white {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-content-card {
    padding: 1.8rem 1.2rem;
  }
}