/* ==========================================================================
   龙猫云机场 (Totoro Cloud Airport) - Design System & Styles
   Aesthetic: Fluffy Pet & Soft Rounded (绒毛龙猫萌宠轻拟态风)
   Palette: Chinchilla Grey, Cream White, Paw Pad Pink & Honey Warm Accents
   ========================================================================== */

:root {
  /* Color Tokens */
  --bg-cream: #FAF6F0;
  --bg-page: #FDFBF7;
  --bg-card: #FFFFFF;
  --bg-card-alt: #F7F3EE;
  
  --text-main: #3D3632;
  --text-sub: #786F6A;
  --text-muted: #A39891;
  --text-white: #FFFFFF;
  
  --brand-primary: #524945;
  --brand-totoro-grey: #6E7582;
  --brand-slate: #485260;
  
  --paw-pink: #FF9EB5;
  --paw-pink-hover: #FF758F;
  --paw-pink-light: #FFF0F3;
  --paw-pink-border: #FFD4DF;
  
  --accent-honey: #FFC56E;
  --accent-honey-light: #FFF8EB;
  --accent-mint: #8EE0C0;
  --accent-mint-light: #EBFBF5;
  
  --border-light: #F0EAE1;
  --border-pink: #FFDDE5;
  
  /* Fluffy Soft Shadows */
  --shadow-fluffy-sm: 0 6px 20px -4px rgba(82, 73, 69, 0.06), 0 2px 8px -1px rgba(255, 158, 181, 0.12);
  --shadow-fluffy: 0 16px 40px -10px rgba(82, 73, 69, 0.08), 0 4px 16px -2px rgba(255, 158, 181, 0.16);
  --shadow-fluffy-hover: 0 24px 50px -12px rgba(82, 73, 69, 0.14), 0 8px 24px -2px rgba(255, 117, 143, 0.25);
  --shadow-inner-glow: inset 0 2px 5px rgba(255, 255, 255, 0.9), inset 0 -2px 6px rgba(82, 73, 69, 0.03);

  /* Radius Tokens (Ultra Soft Capsule Curves) */
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --radius-pill: 9999px;

  /* Fonts & Transitions */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --transition-squish: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease, background-color 0.2s ease;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: var(--transition-squish);
}

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

ul {
  list-style: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 16px;
  z-index: 1000;
  margin-bottom: 24px;
}

.nav-capsule {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-pill);
  padding: 12px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-fluffy-sm);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.logo-paw-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--paw-pink-light), #FFE4EC);
  border: 2px solid var(--paw-pink-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 10px rgba(255, 158, 181, 0.25);
  transition: var(--transition-squish);
}

.brand-logo:hover .logo-paw-icon {
  transform: rotate(-10deg) scale(1.1);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-sub);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--brand-primary);
  background-color: var(--paw-pink-light);
}

.nav-cta-btn {
  background: linear-gradient(135deg, var(--paw-pink) 0%, var(--paw-pink-hover) 100%);
  color: var(--text-white);
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 8px 20px -4px rgba(255, 117, 143, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-cta-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 28px -4px rgba(255, 117, 143, 0.5);
  color: var(--text-white);
}

.nav-cta-btn:active {
  transform: scale(0.95);
}

/* Mobile Nav Menu Button */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* Fluffy Buttons & Squish Animation */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: var(--transition-squish);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--paw-pink) 0%, #FF6B8B 100%);
  color: var(--text-white);
  box-shadow: 0 12px 28px -6px rgba(255, 117, 143, 0.45), 0 4px 10px rgba(0, 0, 0, 0.05);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 18px 36px -6px rgba(255, 117, 143, 0.55);
  color: var(--text-white);
}

.btn-primary:active {
  transform: scale(0.95);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--brand-primary);
  border: 2px solid var(--border-light);
  box-shadow: var(--shadow-fluffy-sm);
}

.btn-secondary:hover {
  background: var(--paw-pink-light);
  border-color: var(--paw-pink-border);
  transform: translateY(-2px);
  color: var(--brand-primary);
}

.btn-secondary:active {
  transform: scale(0.95);
}

/* Badges & Tags */
.badge-capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--paw-pink-light);
  color: #D84B6A;
  border: 1.5px solid var(--paw-pink-border);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  font-weight: 700;
}

.badge-honey {
  background: var(--accent-honey-light);
  color: #C07914;
  border-color: #FFE5B4;
}

.badge-mint {
  background: var(--accent-mint-light);
  color: #1A8A63;
  border-color: #BBEEDC;
}

/* Sections General */
.section {
  padding: 72px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--brand-primary);
  line-height: 1.3;
  margin-top: 12px;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* Fluffy Card Base */
.fluffy-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
  padding: 36px;
  box-shadow: var(--shadow-fluffy);
  transition: var(--transition-squish);
  position: relative;
  overflow: visible;
}

.fluffy-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-fluffy-hover);
  border-color: var(--paw-pink-border);
}

/* Hero Section */
.hero-section {
  padding: 40px 0 72px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

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

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--brand-primary);
  margin-top: 16px;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-title span.highlight-pink {
  color: #FF5376;
  background: linear-gradient(120deg, rgba(255, 158, 181, 0.25) 0%, rgba(255, 117, 143, 0.15) 100%);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-sub);
  margin-bottom: 32px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 24px;
  border-top: 2px dashed var(--border-light);
  width: 100%;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--brand-primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image-card {
  background: linear-gradient(145deg, #FFFFFF, #FAF5EF);
  border-radius: var(--radius-xl);
  border: 3px solid #FFF;
  padding: 16px;
  box-shadow: var(--shadow-fluffy-hover);
  position: relative;
  animation: floatBounce 4s ease-in-out infinite;
}

.hero-image-card img {
  border-radius: var(--radius-lg);
}

.floating-badge-1 {
  position: absolute;
  top: -16px;
  left: -20px;
  background: var(--bg-card);
  border: 2px solid var(--paw-pink-border);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-fluffy);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.9rem;
}

.floating-badge-2 {
  position: absolute;
  bottom: -16px;
  right: -16px;
  background: var(--bg-card);
  border: 2px solid #FFE5B4;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-fluffy);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.9rem;
}

@keyframes floatBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-icon-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--paw-pink-light);
  border: 2px solid var(--paw-pink-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  transition: var(--transition-squish);
}

.fluffy-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(6deg);
  background: var(--paw-pink);
  color: #FFF;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* Pricing Grid (Reference User Screenshot Table) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: 20px;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  border-radius: var(--radius-xl);
  padding: 32px 24px;
}

.pricing-card.popular {
  border-color: var(--paw-pink);
  background: linear-gradient(180deg, #FFFFFF 0%, var(--paw-pink-light) 100%);
  transform: scale(1.04);
  position: relative;
  z-index: 2;
}

.pricing-card.popular:hover {
  transform: scale(1.06) translateY(-6px);
}

.pricing-popular-badge {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--paw-pink), #FF5376);
  color: #FFF;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 18px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(255, 83, 118, 0.35);
  white-space: nowrap;
  z-index: 10;
}

.pricing-plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.4rem;
  font-weight: 900;
  color: #FF476E;
  margin-bottom: 16px;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pricing-features {
  margin: 20px 0 28px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-sub);
}

.pricing-feature-item i {
  color: var(--paw-pink-hover);
  font-weight: 900;
}

/* Target Audience Grid */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.audience-card {
  text-align: center;
  padding: 28px 20px;
}

.audience-avatar {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.audience-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
}

/* Tutorial Tab Component */
.tutorial-wrapper {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
  padding: 40px;
  box-shadow: var(--shadow-fluffy);
}

.tab-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-card-alt);
  border: 2px solid var(--border-light);
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-sub);
  cursor: pointer;
  transition: var(--transition-squish);
}

.tab-btn:hover, .tab-btn.active {
  background: var(--paw-pink);
  border-color: var(--paw-pink-hover);
  color: #FFF;
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(255, 117, 143, 0.3);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.step-card {
  background: var(--bg-card-alt);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.step-num {
  width: 36px;
  height: 36px;
  background: var(--paw-pink);
  color: #FFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* Article Showcase Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-tag {
  align-self: flex-start;
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.6;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.article-read-more {
  font-weight: 700;
  color: #FF476E;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-fluffy-sm);
  transition: var(--transition-squish);
}

.faq-question {
  padding: 20px 28px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--paw-pink-hover);
  transition: transform 0.25s ease;
}

.faq-item.active .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  padding: 0 28px;
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 28px 24px 28px;
}

/* Footer Section */
.site-footer {
  background: #3A3330;
  color: #E2DCD7;
  padding: 64px 0 32px 0;
  margin-top: 96px;
  border-top-left-radius: var(--radius-xl);
  border-top-right-radius: var(--radius-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: #ADA49E;
  margin-top: 16px;
  line-height: 1.7;
  max-width: 340px;
}

.footer-column-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: #FFF;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #C0B7B0;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--paw-pink);
  transform: translateX(4px);
}

.footer-seo-keywords {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.seo-tag {
  font-size: 0.78rem;
  color: #8C837C;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: #8C837C;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Article Detail Page Layout */
.article-container {
  max-width: 860px;
  margin: 40px auto;
  background: #FFF;
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-light);
  padding: 48px;
  box-shadow: var(--shadow-fluffy);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.article-header {
  margin-bottom: 36px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--brand-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding-bottom: 20px;
  border-bottom: 2px dashed var(--border-light);
}

.article-content {
  font-size: 1.05rem;
  color: #332D29;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--brand-primary);
  margin-top: 40px;
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 4px solid var(--paw-pink);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-slate);
  margin-top: 28px;
  margin-bottom: 12px;
}

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

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

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

.article-callout {
  background: var(--paw-pink-light);
  border-left: 4px solid var(--paw-pink);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  margin: 28px 0;
}

.article-callout-title {
  font-weight: 800;
  color: #D84B6A;
  margin-bottom: 6px;
}

.article-faq-box {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-light);
}

.related-posts {
  margin-top: 48px;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    align-items: center;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .feature-grid, .pricing-grid, .audience-grid, .article-grid, .step-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .feature-grid, .pricing-grid, .audience-grid, .article-grid, .step-list {
    grid-template-columns: 1fr;
  }
  .pricing-card.popular {
    transform: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 24px 20px;
  }
  .hero-title {
    font-size: 2rem;
  }
}