/* ============================================================
   The X10 — Tree Knowledge Hub
   Premium single-page design with categories
   ============================================================ */

:root {
  --blue: #0F4C83;
  --blue-deep: #0A3A66;
  --blue-soft: #E8EEF5;
  --orange: #F68A39;
  --orange-soft: #FDE5D0;
  --green: #7BA05B;
  --cream: #FAF7F2;
  --cream-deep: #F0EBE0;
  --paper: #FFFFFF;
  --ink: #1A1A1A;
  --ink-soft: #5A5A5A;
  --ink-mute: #8A8A8A;
  --line: #ECE7D8;
  --shadow-sm: 0 2px 8px rgba(15, 76, 131, 0.06);
  --shadow-md: 0 6px 24px rgba(15, 76, 131, 0.08);
  --shadow-lg: 0 16px 48px rgba(15, 76, 131, 0.12);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Prompt', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.6;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.serif {
  font-family: 'Playfair Display', 'Prompt', serif;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ============================================================
   NAV (Sticky top)
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 242, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  background: var(--orange);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.5px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.nav-logo {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  display: block;
  box-shadow: var(--shadow-sm);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 17px;
  color: var(--blue);
}

.brand-tag {
  font-size: 10px;
  color: var(--orange);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 500;
}

.nav-links {
  display: none;
  gap: 24px;
  font-size: 13px;
  color: var(--ink-soft);
}

.nav-links a {
  position: relative;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--orange); }
.nav-links a.active { color: var(--blue); font-weight: 500; }

@media (min-width: 800px) {
  .nav-links { display: flex; }
}

/* ============================================================
   HERO — Brochure-style poster
   ============================================================ */
.hero {
  max-width: 720px;
  margin: 40px auto;
  padding: 50px 36px 36px;
  text-align: center;
  position: relative;
  border: 2px solid var(--blue);
  border-radius: 24px;
  background: var(--cream);
  box-shadow: 0 24px 80px rgba(15, 76, 131, 0.12);
}

@media (max-width: 760px) {
  .hero {
    margin: 16px;
    padding: 36px 20px 28px;
    border-radius: 16px;
  }
}

/* Brand logo */
.brand-block {
  margin-bottom: 8px;
  display: flex;
  justify-content: center;
}
.brand-logo {
  width: clamp(180px, 32vw, 260px);
  height: auto;
  display: block;
  filter: drop-shadow(0 6px 16px rgba(15, 76, 131, 0.18));
  transition: transform 0.3s ease;
}
.brand-logo:hover { transform: scale(1.02); }

/* Leaf divider */
.leaf-divider {
  display: flex; align-items: center; justify-content: center;
  gap: 16px; margin: 22px 0 18px;
}
.leaf-divider .line {
  flex: 0 0 80px; height: 1px; background: var(--blue); opacity: 0.4;
}
.leaf-divider .leaf { color: var(--orange); font-size: 14px; }

/* Tagline */
.hero-tagline {
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 600; color: var(--blue); line-height: 1.3;
  margin-bottom: 28px;
}
.hero-tagline span { display: block; }

/* Big CO2 */
.hero-co2 { margin: 24px 0; }
.co2-lead {
  font-size: 15px; color: var(--blue); margin-bottom: 8px; font-weight: 400;
}
.co2-row {
  display: flex; align-items: center; justify-content: center;
  gap: 14px; flex-wrap: wrap;
}
.co2-leaf { flex-shrink: 0; }
.co2-text { text-align: left; display: flex; flex-direction: column; }
.co2-number {
  font-size: clamp(54px, 10vw, 80px);
  font-weight: 700; color: var(--blue); line-height: 1; letter-spacing: -1px;
}
.co2-unit-row {
  display: flex; align-items: baseline; gap: 8px; margin-top: 2px;
}
.co2-unit-big { font-size: 20px; color: var(--blue); font-weight: 500; }
.co2-co2 {
  font-size: 30px; color: var(--orange); font-weight: 700;
  font-family: 'Playfair Display', serif;
}
.co2-co2 sub { font-size: 18px; vertical-align: sub; }
.co2-per { font-size: 18px; color: var(--blue); font-weight: 500; }
.co2-footnote {
  font-size: 11px; color: var(--ink-soft); margin-top: 12px;
}

/* Equivalents */
.hero-equiv {
  margin: 30px 0;
  padding: 22px 0;
  border-top: 1px solid rgba(15, 76, 131, 0.18);
  border-bottom: 1px solid rgba(15, 76, 131, 0.18);
}
.equiv-title {
  display: flex; align-items: center; justify-content: center;
  gap: 14px; margin-bottom: 18px; color: var(--blue);
}
.equiv-title .line {
  flex: 0 0 60px; height: 1px; background: var(--blue); opacity: 0.3;
}
.equiv-title .text { font-size: 14px; font-weight: 500; }
.equiv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.equiv-item { text-align: center; padding: 6px 4px; position: relative; }
.equiv-item:not(:last-child)::after {
  content: ''; position: absolute; right: 0; top: 25%; bottom: 25%;
  width: 1px; background: rgba(15, 76, 131, 0.18);
}
.equiv-icon { font-size: 28px; margin-bottom: 4px; }
.equiv-label {
  font-size: 11px; color: var(--blue); margin-bottom: 4px;
  line-height: 1.3;
}
.equiv-amount {
  font-size: clamp(18px, 4vw, 26px);
  font-weight: 700; color: var(--blue); line-height: 1; letter-spacing: -0.5px;
  font-family: 'Playfair Display', serif;
}
.equiv-unit { font-size: 11px; color: var(--ink-soft); margin-top: 4px; }

/* PM 2.5 */
.hero-pm25 {
  background: var(--blue); color: white;
  padding: 24px 22px; border-radius: 14px;
  margin: 22px 0; display: flex; align-items: center; gap: 16px;
  text-align: left;
}
.pm25-icon { flex-shrink: 0; }
.pm25-content { flex: 1; }
.pm25-title {
  font-size: 13px; color: rgba(255,255,255,0.92);
  line-height: 1.4; margin-bottom: 4px;
}
.pm25-highlight {
  font-size: 18px; color: white; font-weight: 700;
  line-height: 1.3; margin-bottom: 4px;
}
.pm25-sub {
  font-size: 11px; color: rgba(255,255,255,0.72); line-height: 1.5;
}

@media (max-width: 520px) {
  .hero-pm25 { flex-direction: column; text-align: center; padding: 20px 16px; }
  .pm25-icon svg { width: 48px; height: 48px; }
}

/* Mascots */
.hero-mascots {
  margin: 32px 0 24px;
  text-align: center;
  padding: 24px 12px;
  background: linear-gradient(180deg, #FFF7F0 0%, var(--cream) 100%);
  border-radius: 16px;
  border: 1px dashed rgba(246, 138, 57, 0.35);
}
.mascot-eyebrow {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; margin-bottom: 8px;
}
.mascot-eyebrow .line {
  flex: 0 0 32px; height: 1px; background: var(--orange); opacity: 0.4;
}
.mascot-eyebrow .text {
  font-size: 10px; letter-spacing: 3px; font-weight: 700; color: var(--orange);
}
.mascot-title {
  font-size: 22px; color: var(--blue); margin-bottom: 14px; font-weight: 700;
}
.mascot-title .boy { color: var(--blue); }
.mascot-title .girl { color: #C2185B; }

.mascot-image-wrap { margin: 16px auto; max-width: 460px; }
.mascot-image {
  width: 100%; height: auto; display: block; border-radius: 12px;
}
.mascot-fallback {
  display: none;
  justify-content: center; gap: 24px;
  padding: 20px;
}
.bear {
  width: 130px; text-align: center;
  background: white; border-radius: 14px;
  padding: 14px 8px;
  box-shadow: 0 4px 12px rgba(15, 76, 131, 0.08);
}
.bear-face { font-size: 48px; line-height: 1; }
.bear-float { font-size: 32px; margin-top: -8px; line-height: 1; }
.bear-girl .bear-float { filter: hue-rotate(45deg); }
.bear-name {
  margin-top: 8px; font-weight: 700; color: var(--blue);
  font-family: 'Playfair Display', serif;
}
.bear-girl .bear-name { color: #C2185B; }

.mascot-bios {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 14px; margin-top: 16px; text-align: left;
}
.mascot-bios .bio {
  background: white; padding: 12px 14px; border-radius: 10px;
  font-size: 12px;
}
.mascot-bios strong {
  color: var(--blue); font-family: 'Playfair Display', serif;
  font-size: 14px; display: block; margin-bottom: 4px;
}
.mascot-bios .bio:last-child strong { color: #C2185B; }
.mascot-bios p { color: var(--ink-soft); line-height: 1.5; }

@media (max-width: 480px) {
  .mascot-bios { grid-template-columns: 1fr; }
}

/* 200,000 trees */
.hero-trees {
  display: flex; align-items: center; justify-content: center;
  gap: 14px; margin: 22px 0 8px; text-align: left;
}
.tree-graphic { flex-shrink: 0; }
.tree-graphic svg { width: 90px; height: auto; }
.trees-text { flex: 1; max-width: 360px; }
.trees-lead { font-size: 17px; color: var(--blue); font-weight: 600; }
.trees-num {
  font-size: clamp(36px, 8vw, 54px);
  font-weight: 700; color: var(--blue); line-height: 1;
  display: inline-block;
}
.trees-unit {
  display: inline-block; font-size: 20px;
  color: var(--blue); font-weight: 500; margin-left: 6px;
}
.trees-sub {
  font-size: 11px; color: var(--ink-soft);
  margin-top: 6px; line-height: 1.5;
}

@media (max-width: 520px) {
  .hero-trees { flex-direction: column; text-align: center; gap: 4px; }
}

/* Stats row */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
}

.stat {
  background: var(--paper);
  padding: 28px 16px;
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--line);
  transition: transform 0.3s, box-shadow 0.3s;
}

.stat:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-num {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 32px;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-lbl {
  font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

/* ============================================================
   SECTION
   ============================================================ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 28px;
}

.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--orange);
  font-weight: 600;
  margin-bottom: 12px;
}

.section-title {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: clamp(28px, 4vw, 40px);
  color: var(--blue);
  line-height: 1.15;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================================
   CATEGORY FILTERS
   ============================================================ */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 48px;
  padding: 0 28px;
}

.filter-btn {
  background: var(--paper);
  border: 1.5px solid var(--line);
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.filter-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
  transform: translateY(-1px);
}

.filter-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
  box-shadow: var(--shadow-md);
}

.filter-btn .ic { font-size: 16px; }
.filter-btn .count {
  background: rgba(255,255,255,0.2);
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
}

.filter-btn:not(.active) .count {
  background: var(--cream-deep);
  color: var(--ink-mute);
}

/* ============================================================
   CATEGORY HEADER (when scrolling)
   ============================================================ */
.cat-block {
  margin-bottom: 80px;
  scroll-margin-top: 100px;
}

.cat-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
  padding: 32px;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--cat-from, var(--blue)) 0%, var(--cat-to, var(--blue-deep)) 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.cat-header::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255,255,255,0.08), transparent 70%);
}

.cat-icon {
  font-size: 56px;
  line-height: 1;
  flex-shrink: 0;
}

.cat-info {
  flex: 1;
}

.cat-sub {
  font-size: 11px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  opacity: 0.75;
  margin-bottom: 6px;
}

.cat-name {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 28px;
  margin-bottom: 8px;
}

.cat-desc {
  font-size: 14px;
  opacity: 0.92;
  font-weight: 300;
  max-width: 520px;
}

.cat-stats {
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-align: right;
  flex-shrink: 0;
}

.cat-stat .num {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
}

.cat-stat .lbl {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  opacity: 0.75;
  margin-top: 4px;
}

@media (max-width: 700px) {
  .cat-header {
    flex-direction: column;
    text-align: center;
    padding: 28px 20px;
  }
  .cat-stats { flex-direction: row; gap: 28px; text-align: center; }
}

/* ============================================================
   TREE CARDS — Editorial / Magazine style (world-class)
   ============================================================ */
.tree-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 700px) {
  .tree-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1100px) {
  .tree-grid { grid-template-columns: repeat(3, 1fr); }
}

.tree-card {
  background: var(--paper);
  border-radius: 4px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--card-accent, var(--blue));
  padding: 28px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  text-align: left;
}

.tree-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 50px rgba(15, 76, 131, 0.08);
}

.tree-card.hero {
  border-top-color: var(--orange);
  background:
    linear-gradient(180deg, rgba(253, 229, 208, 0.18) 0%, var(--paper) 35%);
}

.tree-card .card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  min-height: 14px;
}

.tree-card .hero-mark {
  font-size: 9px;
  letter-spacing: 2.5px;
  font-weight: 700;
  color: var(--orange);
  white-space: nowrap;
}

.cat-tag {
  font-size: 9px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--card-accent, var(--blue));
  font-weight: 600;
  display: inline-block;
  margin: 0;
}

.tree-name {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 28px;
  color: var(--blue);
  line-height: 1.1;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
}

.tree-sub-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--ink-mute);
}

.tree-alt {
  color: var(--ink-soft);
  font-weight: 500;
}

.tree-sci {
  font-style: italic;
  color: var(--ink-mute);
}

.tree-short {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.65;
  margin-bottom: 22px;
  flex: 1;
}

/* Stats row — minimal */
.tree-stats {
  display: flex;
  gap: 0;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}

.tree-stat {
  flex: 1;
  text-align: center;
  padding: 0 8px;
}

.tree-stat + .tree-stat {
  border-left: 1px solid var(--line);
}

.tree-stat-num {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 24px;
  color: var(--blue);
  line-height: 1;
}

.tree-stat-num.co2 { color: var(--orange); }

.tree-stat-lbl {
  font-size: 9px;
  color: var(--ink-mute);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-top: 6px;
  font-weight: 500;
}

.tree-toggle {
  background: transparent;
  border: 1px solid var(--blue);
  color: var(--blue);
  padding: 13px 16px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
}

.tree-toggle:hover {
  background: var(--blue);
  color: white;
}

.tree-toggle .arrow {
  font-size: 14px;
  transition: transform 0.25s;
  font-family: 'Playfair Display', serif;
}

.tree-card.open .tree-toggle .arrow { transform: rotate(180deg); }

.tree-details {
  display: none;
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.tree-card.open .tree-details { display: block; }

/* Quick facts grid (ออกดอก/ดูแล/อายุ/ความสูง) */
.facts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}

@media (min-width: 480px) {
  .facts-grid { grid-template-columns: 1fr 1fr; }
}

.fact {
  background: var(--cream);
  border-radius: 4px;
  padding: 12px 14px;
  border-left: 2px solid var(--card-accent, var(--blue));
}

.fact-label {
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
}

.fact-value {
  font-size: 13px;
  color: var(--blue);
  font-weight: 500;
  line-height: 1.45;
}

/* Story sections — magazine style */
.story-section { margin-bottom: 24px; }

.story-section:last-child { margin-bottom: 0; }

.story-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.story-eyebrow .line {
  flex: 1;
  height: 1px;
  background: var(--card-accent, var(--blue));
  opacity: 0.25;
}

.story-eyebrow .label {
  font-size: 9px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--card-accent, var(--blue));
  font-weight: 700;
}

.story-text {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink);
}

.story-text + .story-text {
  margin-top: 8px;
}

.story-text strong {
  color: var(--blue);
  font-weight: 600;
}

/* Storytelling pull-quote block */
.storytelling-block {
  background: var(--cream);
  border-radius: 4px;
  padding: 22px 22px 22px 26px;
  margin: 16px 0;
  position: relative;
}

.storytelling-block::before {
  content: '"';
  position: absolute;
  top: 4px;
  left: 12px;
  font-family: 'Playfair Display', serif;
  font-size: 48px;
  color: var(--orange);
  line-height: 1;
  font-style: italic;
}

.storytelling-block .text {
  font-family: 'Playfair Display', serif;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  font-style: italic;
  font-weight: 500;
  padding-left: 18px;
}

/* Benefits list */
.benefits {
  list-style: none;
  margin: 0;
}

.benefits li {
  position: relative;
  padding-left: 22px;
  font-size: 13px;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.6;
}

.benefits li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 1px;
  background: var(--orange);
}

/* ============================================================
   FOOTER (brochure orange band)
   ============================================================ */
footer {
  background: var(--orange);
  color: white;
  padding: 32px 28px 28px;
  margin-top: 60px;
  text-align: center;
  position: relative;
}

footer .foot-leaf {
  font-size: 16px;
  color: white;
  margin-bottom: 12px;
  opacity: 0.85;
}

footer .foot-logo {
  width: 76px;
  height: 76px;
  margin-bottom: 16px;
  display: inline-block;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  background: white;
  padding: 2px;
}

footer h2 {
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  font-size: clamp(18px, 3vw, 24px);
  line-height: 1.3;
  margin-bottom: 8px;
  color: white;
}

footer .quote {
  font-size: 10px;
  color: rgba(255,255,255,0.9);
  letter-spacing: 3px;
  font-weight: 400;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeUp 0.6s ease-out backwards;
}

.fade-in:nth-child(1) { animation-delay: 0.05s; }
.fade-in:nth-child(2) { animation-delay: 0.1s; }
.fade-in:nth-child(3) { animation-delay: 0.15s; }
.fade-in:nth-child(4) { animation-delay: 0.2s; }
.fade-in:nth-child(5) { animation-delay: 0.25s; }
.fade-in:nth-child(6) { animation-delay: 0.3s; }