/* ===================================================================
   YinCloud (隐云) - Japanese Zen Minimalism (和风禅意极简设计系统)
   Color Palette:
     - Warm Off-White (和纸温白): #faf9f5
     - Surface Muted (枯山灰白): #f3f1ea
     - Ink Dark (浓墨): #33322e
     - Ink Medium (淡墨): #5c5a53
     - Ink Muted (薄墨): #8c8a82
     - Hairline Border (细线界): #e5e2d8
     - Vermilion Accent (朱砂红): #b03a2e
   Typography:
     - Serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif
     - Accent Roman: 'Cormorant Garamond', 'Cinzel', serif
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,400&family=Noto+Serif+SC:wght@300;400;500;600;700&display=swap');

:root {
  --bg-warm: #faf9f5;
  --bg-surface: #f3f1ea;
  --bg-surface-subtle: #f8f6f0;
  
  --text-ink: #33322e;
  --text-medium: #5c5a53;
  --text-muted: #8c8a82;
  --text-faint: #b5b3aa;
  
  --border-hairline: #e5e2d8;
  --border-subtle: rgba(51, 50, 46, 0.08);
  --border-ink: #33322e;
  
  --vermilion: #b03a2e;
  --vermilion-subtle: rgba(176, 58, 46, 0.06);
  --vermilion-border: rgba(176, 58, 46, 0.25);
  
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', SimSun, serif;
  --font-roman: 'Cormorant Garamond', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  
  --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s ease;
}

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

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

body {
  font-family: var(--font-serif);
  background-color: var(--bg-warm);
  color: var(--text-ink);
  line-height: 1.85;
  letter-spacing: 0.04em;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Subtle Washi Paper Texture Overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(51, 50, 46, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 9999;
}

/* Selection Color */
::selection {
  background-color: rgba(176, 58, 46, 0.15);
  color: var(--vermilion);
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}

.container-narrow {
  max-width: 820px;
}

/* -------------------------------------------------------------------
   2. Vertical Text Column (右侧边栏「隐于云·藏于心」)
   ------------------------------------------------------------------- */
.zen-vertical-column {
  position: fixed;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.5em;
  color: var(--text-muted);
  border-left: 1px solid var(--border-hairline);
  padding-left: 10px;
  z-index: 40;
  pointer-events: none;
  user-select: none;
  opacity: 0.85;
}

.zen-vertical-column span {
  display: inline-block;
  font-weight: 400;
}

/* -------------------------------------------------------------------
   3. Buttons & Interactive Elements (Outline Minimalist)
   ------------------------------------------------------------------- */
.btn-zen {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 13px 36px;
  font-family: var(--font-serif);
  font-size: 0.92rem;
  letter-spacing: 0.22em;
  color: var(--text-ink);
  background: transparent;
  border: 1px solid var(--text-ink);
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  white-space: nowrap;
}

.btn-zen:hover {
  background: var(--text-ink);
  color: var(--bg-warm);
  transform: translateY(-1px);
}

.btn-zen-vermilion {
  border-color: var(--vermilion);
  color: var(--vermilion);
}

.btn-zen-vermilion:hover {
  background: var(--vermilion);
  color: var(--bg-warm);
  border-color: var(--vermilion);
}

.btn-zen-sm {
  padding: 8px 22px;
  font-size: 0.84rem;
  letter-spacing: 0.18em;
}

.btn-zen-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  letter-spacing: 0.15em;
  color: var(--text-medium);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: all var(--transition-normal);
}

.btn-zen-link:hover {
  color: var(--text-ink);
  border-bottom-color: var(--text-ink);
}

/* -------------------------------------------------------------------
   4. Vermilion Seal Stamp (朱红方印)
   ------------------------------------------------------------------- */
.zen-seal {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  width: 44px;
  height: 44px;
  border: 2px solid var(--vermilion);
  border-radius: 3px;
  padding: 2px;
  color: var(--vermilion);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  text-align: center;
  align-items: center;
  justify-content: center;
  background: var(--vermilion-subtle);
  transform: rotate(-2.5deg);
  user-select: none;
  box-shadow: 0 0 0 1px rgba(176, 58, 46, 0.12) inset;
  flex-shrink: 0;
}

.zen-seal span {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* -------------------------------------------------------------------
   5. Navbar (Sticky Hairline Header)
   ------------------------------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  background: rgba(250, 249, 245, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 100;
  transition: all var(--transition-normal);
}

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

.brand-logotype {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-normal);
}

.brand-logotype:hover .brand-logo-img {
  transform: scale(1.02);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  color: var(--text-ink);
}

.brand-sub {
  font-family: var(--font-roman);
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 36px;
}

.nav-link {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  letter-spacing: 0.16em;
  color: var(--text-medium);
  transition: color var(--transition-normal);
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-ink);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 1px;
  background: var(--text-ink);
  transition: width var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--text-ink);
  background: transparent;
  border: 1px solid var(--border-hairline);
}

/* -------------------------------------------------------------------
   6. Mobile Drawer Menu
   ------------------------------------------------------------------- */
.mobile-drawer {
  position: fixed;
  inset: 0;
  background: rgba(250, 249, 245, 0.98);
  backdrop-filter: blur(20px);
  z-index: 200;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.drawer-close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-hairline);
}

.drawer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 40px 0;
}

.drawer-nav a {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: 0.25em;
  color: var(--text-ink);
}

.drawer-footer {
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* -------------------------------------------------------------------
   7. Hero Section (Centered with Faint Slowly-Rotating Enso Circle)
   ------------------------------------------------------------------- */
.hero-section {
  position: relative;
  min-height: 86vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 130px 0 110px;
  overflow: hidden;
}

/* Faint Slowly-Rotating Enso Circle */
.enso-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 580px;
  height: 580px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
  user-select: none;
}

.enso-circle {
  width: 100%;
  height: 100%;
  animation: rotateEnso 120s linear infinite;
  transform-origin: center center;
}

@keyframes rotateEnso {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--text-muted);
  border: 1px solid var(--border-hairline);
  padding: 6px 20px;
  margin-bottom: 36px;
  background: rgba(250, 249, 245, 0.7);
}

.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4.5vw, 3.6rem);
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--text-ink);
  line-height: 1.4;
  margin-bottom: 30px;
}

.headline-block {
  display: inline-block;
  white-space: nowrap;
}

.hero-manifesto {
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 1.8vw, 1.18rem);
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--text-medium);
  line-height: 2.1;
  margin: 0 auto 46px;
  max-width: 680px;
}

.hero-manifesto span {
  display: block;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

/* -------------------------------------------------------------------
   8. Section Common Styling
   ------------------------------------------------------------------- */
.section {
  padding: 120px 0;
  position: relative;
}

.section-quiet {
  background-color: var(--bg-surface-subtle);
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}

.section-header {
  text-align: center;
  margin-bottom: 70px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-roman);
  font-size: 0.82rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--text-ink);
  line-height: 1.4;
}

.section-subtitle {
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-top: 12px;
}

/* -------------------------------------------------------------------
   9. Philosophy Section (Quiet Philosophy with Vermilion Seal Stamp)
   ------------------------------------------------------------------- */
.philosophy-card {
  border: 1px solid var(--border-hairline);
  background: var(--bg-warm);
  padding: 64px 56px;
  text-align: center;
  position: relative;
  max-width: 820px;
  margin: 0 auto;
}

.philosophy-stamp-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.philosophy-stamp-tag {
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  color: var(--vermilion);
}

.philosophy-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--text-ink);
  line-height: 2.1;
  margin-bottom: 28px;
}

.philosophy-prose {
  font-size: 0.96rem;
  color: var(--text-medium);
  line-height: 2.0;
  letter-spacing: 0.08em;
  max-width: 640px;
  margin: 0 auto;
}

/* -------------------------------------------------------------------
   10. 4 Sparse Feature Rows (Separated by 1px Hairlines)
   ------------------------------------------------------------------- */
.feature-rows {
  border-bottom: 1px solid var(--border-hairline);
}

.feature-row {
  border-top: 1px solid var(--border-hairline);
  padding: 44px 0;
  display: grid;
  grid-template-columns: 80px 280px 1fr;
  align-items: baseline;
  gap: 32px;
  transition: background-color var(--transition-normal);
}

.feature-row:hover {
  background-color: rgba(243, 241, 234, 0.4);
}

.feature-num {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--vermilion);
  letter-spacing: 0.15em;
  font-weight: 500;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-ink);
  line-height: 1.5;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-medium);
  line-height: 1.9;
  letter-spacing: 0.05em;
}

/* -------------------------------------------------------------------
   11. 3-Step Process (上传 / 加密 / 同步)
   ------------------------------------------------------------------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  position: relative;
}

.step-card {
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

.step-card:hover {
  transform: translateY(-2px);
}

.step-index {
  font-family: var(--font-roman);
  font-size: 0.88rem;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--text-ink);
  margin-bottom: 14px;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-medium);
  line-height: 1.95;
  letter-spacing: 0.04em;
}

/* -------------------------------------------------------------------
   12. Pricing Section (3 Calm Columns with Thin Top Rules)
   ------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-warm);
  border-top: 1px solid var(--border-hairline);
  padding: 44px 32px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card:hover {
  background: var(--bg-surface-subtle);
}

/* Middle Tier Vermilion Accent */
.pricing-card-featured {
  border-top: 2px solid var(--vermilion);
  background: var(--bg-surface-subtle);
}

.tier-header {
  margin-bottom: 28px;
}

.tier-badge {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--vermilion);
  margin-bottom: 8px;
  font-weight: 500;
}

.tier-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--text-ink);
  margin-bottom: 8px;
}

.tier-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.tier-price {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
}

.price-currency {
  font-family: var(--font-roman);
  font-size: 1.1rem;
  color: var(--text-ink);
}

.price-num {
  font-family: var(--font-roman);
  font-size: 2.8rem;
  font-weight: 400;
  color: var(--text-ink);
  line-height: 1;
  letter-spacing: 0.02em;
}

.price-cycle {
  font-size: 0.84rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-left: 6px;
}

.tier-storage {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--text-ink);
  margin-top: 8px;
  font-weight: 500;
}

.tier-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 40px;
  flex-grow: 1;
}

.tier-feature-item {
  font-size: 0.88rem;
  color: var(--text-medium);
  letter-spacing: 0.05em;
  display: flex;
  align-items: baseline;
  gap: 10px;
  line-height: 1.6;
}

.tier-feature-dot {
  width: 4px;
  height: 4px;
  background-color: var(--text-muted);
  border-radius: 50%;
  flex-shrink: 0;
  transform: translateY(-2px);
}

.pricing-card-featured .tier-feature-dot {
  background-color: var(--vermilion);
}

.tier-cta {
  width: 100%;
}

/* -------------------------------------------------------------------
   13. Article Showcase (Knowledge Archive / 文录禅思)
   ------------------------------------------------------------------- */
.articles-list {
  border-bottom: 1px solid var(--border-hairline);
}

.article-row {
  border-top: 1px solid var(--border-hairline);
  padding: 30px 12px;
  display: grid;
  grid-template-columns: 60px 1fr 140px;
  align-items: center;
  gap: 24px;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.article-row:hover {
  background-color: rgba(243, 241, 234, 0.45);
  padding-left: 18px;
}

.article-index {
  font-family: var(--font-roman);
  font-size: 0.95rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
}

.article-title-text {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-ink);
}

.article-meta {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-align: right;
}

/* -------------------------------------------------------------------
   14. FAQ Section (Hairline Dividers with Plus-Sign Toggles)
   ------------------------------------------------------------------- */
.faq-list {
  border-bottom: 1px solid var(--border-hairline);
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border-top: 1px solid var(--border-hairline);
}

.faq-button {
  width: 100%;
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text-ink);
  cursor: pointer;
  transition: color var(--transition-normal);
}

.faq-button:hover {
  color: var(--vermilion);
}

.faq-question {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.5;
}

.faq-toggle-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform var(--transition-normal), color var(--transition-normal);
}

.faq-toggle-icon::before,
.faq-toggle-icon::after {
  content: '';
  position: absolute;
  background-color: currentColor;
  transition: transform var(--transition-normal);
}

/* Horizontal line */
.faq-toggle-icon::before {
  width: 14px;
  height: 1px;
}

/* Vertical line */
.faq-toggle-icon::after {
  width: 1px;
  height: 14px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.16, 1, 0.3, 1), padding var(--transition-normal);
  font-size: 0.94rem;
  color: var(--text-medium);
  line-height: 2.0;
  letter-spacing: 0.05em;
}

.faq-item.active .faq-answer {
  padding-bottom: 28px;
}

/* -------------------------------------------------------------------
   15. Final Centered CTA
   ------------------------------------------------------------------- */
.final-cta-section {
  padding: 140px 0;
  text-align: center;
  border-top: 1px solid var(--border-hairline);
}

.final-cta-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.8vw, 2.8rem);
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--text-ink);
  line-height: 1.4;
  margin-bottom: 24px;
}

.final-cta-desc {
  font-size: 1.02rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 44px;
}

/* -------------------------------------------------------------------
   16. Ultra-Minimal Footer
   ------------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border-hairline);
  padding: 60px 0 40px;
  background: var(--bg-warm);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 36px;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.3em;
  color: var(--text-ink);
}

.footer-links {
  display: flex;
  gap: 28px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.84rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  transition: color var(--transition-normal);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(51, 50, 46, 0.06);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 16px;
}

/* -------------------------------------------------------------------
   17. Slow Gentle Fade-Up Scroll Animation (Progressive & SEO Safe)
   ------------------------------------------------------------------- */
.hero-content .fade-up {
  opacity: 1;
  transform: translateY(0);
}

.fade-up {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
  will-change: opacity, transform;
}

.js-reveal .fade-up:not(.visible) {
  opacity: 0;
  transform: translateY(28px);
}

.fade-up.visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* Stagger Delays */
.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* -------------------------------------------------------------------
   18. Article Subpages Specific Styling (Warm Zen Theme)
   ------------------------------------------------------------------- */
.article-page {
  padding: 80px 0 120px;
}

.article-header {
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 40px;
  margin-bottom: 60px;
}

.article-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--text-ink);
  line-height: 1.4;
  margin-bottom: 20px;
}

.article-body {
  font-size: 1.02rem;
  color: var(--text-ink);
  line-height: 2.1;
  letter-spacing: 0.05em;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-ink);
  margin: 50px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-ink);
  margin: 36px 0 16px;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body ul, .article-body ol {
  margin: 20px 0 28px 24px;
}

.article-body li {
  margin-bottom: 10px;
  color: var(--text-medium);
}

.article-body blockquote {
  border-left: 2px solid var(--vermilion);
  padding: 16px 24px;
  margin: 32px 0;
  background: var(--bg-surface-subtle);
  font-style: italic;
  color: var(--text-medium);
}

.article-internal-link {
  color: var(--vermilion);
  border-bottom: 1px dotted var(--vermilion);
}

.article-internal-link:hover {
  border-bottom-style: solid;
}

/* -------------------------------------------------------------------
   19. Responsive Media Queries (Zen Adaptive)
   ------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .zen-vertical-column {
    display: none;
  }
  .feature-row {
    grid-template-columns: 60px 220px 1fr;
    gap: 20px;
  }
  .steps-grid {
    gap: 32px;
  }
  .pricing-grid {
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .brand-logo-img {
    height: 34px;
  }
  .headline-block {
    display: block;
    margin: 4px 0;
  }
  .nav-menu, .nav-actions {
    display: none;
  }
  .mobile-toggle {
    display: inline-flex;
  }
  .hero-section {
    padding: 100px 0 80px;
    min-height: auto;
  }
  .enso-wrapper {
    width: 380px;
    height: 380px;
  }
  .section {
    padding: 80px 0;
  }
  .philosophy-card {
    padding: 44px 24px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 32px 0;
  }
  .feature-num {
    margin-bottom: -4px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .article-row {
    grid-template-columns: 40px 1fr;
  }
  .article-meta {
    grid-column: 2;
    text-align: left;
    margin-top: -12px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===================================================================
   20. Complete Article & Subpage Layouts (Zen Minimalist)
   =================================================================== */
.bg-ambient, #ambientCanvas, .ambient-orb, .floating-cloud, .cloud-svg-stream, .cloud-silhouette {
  display: none !important;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 56px;
  align-items: start;
  padding: 60px 0 100px;
}

.article-main {
  min-width: 0;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb-separator {
  color: var(--text-faint);
}

.breadcrumbs a:hover {
  color: var(--vermilion);
}

.article-title-main {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--text-ink);
  line-height: 1.4;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.article-card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.article-tag {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  padding: 2px 10px;
  border: 1px solid var(--border-hairline);
  color: var(--text-muted);
  background: var(--bg-surface-subtle);
}

.article-content {
  font-size: 1.02rem;
  line-height: 2.1;
  color: var(--text-ink);
  letter-spacing: 0.04em;
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-ink);
  margin: 48px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-ink);
  margin: 36px 0 16px;
}

.article-content p {
  margin-bottom: 24px;
}

.article-content ul, .article-content ol {
  margin: 18px 0 24px 28px;
}

.article-content li {
  margin-bottom: 8px;
  color: var(--text-medium);
}

.article-content strong {
  color: var(--text-ink);
  font-weight: 600;
}

.article-callout {
  border-left: 2px solid var(--vermilion);
  background: var(--bg-surface-subtle);
  padding: 24px 28px;
  margin: 36px 0;
  font-size: 0.96rem;
  color: var(--text-medium);
  line-height: 1.95;
}

.article-sidebar {
  position: sticky;
  top: 96px;
}

.sidebar-box {
  border: 1px solid var(--border-hairline);
  background: var(--bg-warm);
  padding: 28px;
  margin-bottom: 32px;
}

.toc-title, .footer-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--text-ink);
  margin-bottom: 18px;
  text-transform: uppercase;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toc-link {
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  transition: all var(--transition-normal);
  display: block;
  line-height: 1.5;
}

.toc-link:hover {
  color: var(--vermilion);
  padding-left: 4px;
}

/* Legacy Button Compatibility */
.btn-primary, .btn-secondary, .btn-shine {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 32px;
  font-family: var(--font-serif);
  font-size: 0.92rem;
  letter-spacing: 0.2em;
  color: var(--text-ink);
  background: transparent;
  border: 1px solid var(--text-ink);
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn-primary:hover, .btn-secondary:hover, .btn-shine:hover {
  background: var(--text-ink);
  color: var(--bg-warm);
}

.btn-block {
  width: 100%;
}

.footer-brand-desc {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.8;
  letter-spacing: 0.06em;
  max-width: 320px;
}