/* ============================================================
   Treezpedia — Main Stylesheet
   Pure CSS, no build tools required
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400;1,600&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================================
   CSS Custom Properties (Design System)
   ============================================================ */
:root {
  /* Color palette */
  --bg: #f7f4ef;
  --bg-card: #fff;
  --text: #1c2e22;
  --text-muted: #5a7060;

  --green-900: #0d2818;
  --green-700: #1f5c38;
  --green-500: #329e5a;
  --green-300: #7dd4a0;
  --green-100: #d4f0e1;

  --gold: #c9a84c;
  --gold-light: #e8c870;
  --gold-pale: #f9f0d8;

  --white: #ffffff;
  --black: #000000;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;

  /* Border radius */
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow: 0 4px 24px rgba(13, 40, 24, 0.08);
  --shadow-sm: 0 2px 8px rgba(13, 40, 24, 0.06);
  --shadow-md: 0 8px 32px rgba(13, 40, 24, 0.12);
  --shadow-lg: 0 16px 48px rgba(13, 40, 24, 0.16);
  --shadow-gold: 0 4px 20px rgba(201, 168, 76, 0.3);

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --leading-tight: 1.2;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1280px;
  --container-md: 768px;
  --nav-height: 72px;

  /* Transitions */
  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
  --transition-spring: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

img {
  height: auto;
}

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

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: var(--leading-tight);
  color: var(--text);
}

/* ============================================================
   Reading Progress Bar
   ============================================================ */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--green-500), var(--gold));
  z-index: 9999;
  transition: width 0.1s linear;
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

/* ============================================================
   Utility Classes
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {
  .container { padding-inline: var(--space-6); }
}

@media (min-width: 1024px) {
  .container { padding-inline: var(--space-8); }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--green-500);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .section-title { font-size: var(--text-4xl); }
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  max-width: 600px;
}

.section-subtitle.center {
  margin-inline: auto;
}

/* ============================================================
   Reveal Animation (IntersectionObserver)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   CSS Keyframe Animations
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-12px); }
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-in     { animation: fadeIn 0.5s ease forwards; }
.animate-fade-in-up  { animation: fadeInUp 0.6s ease forwards; }
.animate-scale-in    { animation: scaleIn 0.4s ease forwards; }

/* ============================================================
   Sticky Glass Navbar
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(247, 244, 239, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(50, 158, 90, 0.1);
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(247, 244, 239, 0.96);
  box-shadow: var(--shadow-sm);
}

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

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--green-700);
  text-decoration: none;
  transition: color var(--transition);
}

.navbar-logo:hover { color: var(--green-500); }

.navbar-logo-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.navbar-nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .navbar-nav { display: flex; }
}

.navbar-nav a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--green-700);
  background: rgba(50, 158, 90, 0.08);
}

.navbar-nav a.active { font-weight: 600; }

.navbar-cta { display: none; }

@media (min-width: 768px) {
  .navbar-cta { display: block; }
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.hamburger:hover { background: rgba(50, 158, 90, 0.08); }

@media (min-width: 768px) {
  .hamburger { display: none; }
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--green-700);
  border-radius: var(--radius-full);
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

.hamburger.open .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open .hamburger-line:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(247, 244, 239, 0.98);
  backdrop-filter: blur(16px);
  z-index: 999;
  flex-direction: column;
  padding: var(--space-6);
  gap: var(--space-2);
  animation: fadeIn 0.2s ease;
  overflow-y: auto;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  display: block;
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}

.mobile-menu a:hover,
.mobile-menu a.active {
  background: rgba(50, 158, 90, 0.08);
  color: var(--green-700);
}

.mobile-menu-footer {
  margin-top: auto;
  padding-top: var(--space-6);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  transition: all var(--transition-spring);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--green-700);
  color: var(--white);
  border-color: var(--green-700);
  box-shadow: 0 4px 12px rgba(31, 92, 56, 0.3);
}

.btn-primary:hover {
  background: var(--green-900);
  border-color: var(--green-900);
  box-shadow: 0 6px 20px rgba(31, 92, 56, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--green-700);
  border-color: var(--green-700);
}

.btn-outline:hover {
  background: var(--green-700);
  color: var(--white);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}

.btn-ghost:hover {
  background: rgba(50, 158, 90, 0.08);
  color: var(--green-700);
}

.btn-gold {
  background: var(--gold);
  color: var(--white);
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
  background: var(--gold-light);
  border-color: var(--gold-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(201, 168, 76, 0.4);
}

.btn-white {
  background: var(--white);
  color: var(--green-700);
  border-color: var(--white);
}

.btn-white:hover {
  background: var(--bg);
  transform: translateY(-1px);
}

.btn-sm { padding: 0.5rem 1rem; font-size: var(--text-xs); }
.btn-lg { padding: 1rem 2rem; font-size: var(--text-base); }

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    var(--green-900) 0%,
    var(--green-700) 40%,
    #2d7a4f 70%,
    var(--green-900) 100%
  );
  background-size: 300% 300%;
  animation: gradientShift 12s ease infinite;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-block: var(--space-20);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--green-300);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease forwards;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s 0.1s ease both;
}

.hero h1 .highlight { color: var(--gold-light); }

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255,255,255,0.8);
  line-height: var(--leading-relaxed);
  max-width: 560px;
  margin: 0 auto var(--space-10);
  animation: fadeInUp 0.6s 0.2s ease both;
}

.hero-search {
  display: flex;
  max-width: 520px;
  margin: 0 auto var(--space-8);
  background: var(--white);
  border-radius: var(--radius-full);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  overflow: hidden;
  animation: fadeInUp 0.6s 0.3s ease both;
}

.hero-search input {
  flex: 1;
  padding: 1rem 1.5rem;
  border: none;
  outline: none;
  font-size: var(--text-base);
  color: var(--text);
  background: transparent;
}

.hero-search input::placeholder { color: var(--text-muted); }

.hero-search button {
  padding: 0.75rem 1.5rem;
  background: var(--green-500);
  color: var(--white);
  font-weight: 600;
  font-size: var(--text-sm);
  border: none;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
  font-family: var(--font-sans);
}

.hero-search button:hover { background: var(--green-700); }

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  animation: fadeInUp 0.6s 0.4s ease both;
}

/* Decorative leaf SVG */
.hero-leaf-bg {
  position: absolute;
  right: -80px;
  bottom: -60px;
  width: 500px;
  opacity: 0.06;
  z-index: 1;
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

.hero-leaf-bg-left {
  position: absolute;
  left: -100px;
  top: 20%;
  width: 380px;
  opacity: 0.04;
  z-index: 1;
  animation: float 10s ease-in-out infinite reverse;
  pointer-events: none;
}

/* Small hero (inner pages) */
.hero-sm {
  background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 100%);
  padding-block: var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-sm::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M20 0L0 20h40L20 0zM0 40h40L20 20 0 40z'/%3E%3C/g%3E%3C/svg%3E");
}

.hero-sm .container { position: relative; z-index: 1; }

.hero-sm h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--white);
  margin-bottom: var(--space-4);
}

.hero-sm p {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin-inline: auto;
}

/* ============================================================
   Stats Bar
   ============================================================ */
.stats-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--gray-200);
  padding-block: var(--space-8);
  box-shadow: var(--shadow-sm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  text-align: center;
}

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

.stat-number {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--green-700);
  line-height: 1;
  display: block;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* ============================================================
   Section Generic
   ============================================================ */
.section { padding-block: var(--space-20); }

.section-header { margin-bottom: var(--space-12); }
.section-header.centered { text-align: center; }

/* ============================================================
   Card System
   ============================================================ */
.card-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
}

.card-grid.cols-4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .card-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Tree Card */
.tree-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform var(--transition-spring), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(50, 158, 90, 0.06);
}

.tree-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.tree-card-image {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: var(--gray-200);
}

.tree-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.tree-card:hover .tree-card-image img { transform: scale(1.06); }

.tree-card-body {
  padding: var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.tree-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.tree-card-title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-1);
  line-height: var(--leading-snug);
}

.tree-card-scientific {
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.tree-card-description {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  flex: 1;
  margin-bottom: var(--space-4);
}

.tree-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--gray-100);
}

.tree-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.read-time {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ============================================================
   Tags & Badges
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  line-height: 1.4;
}

.tag-green  { background: var(--green-100); color: var(--green-700); }
.tag-gold   { background: var(--gold-pale); color: #8a6b1f; }
.tag-gray   { background: var(--gray-100);  color: var(--gray-700); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.25rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-fruit      { background: #fff3e0; color: #e65100; }
.badge-medicinal  { background: #e8f5e9; color: #2e7d32; }
.badge-evergreen  { background: #e0f2f1; color: #00695c; }
.badge-rare       { background: #f3e5f5; color: #6a1b9a; }
.badge-tropical   { background: #e0f7fa; color: #00838f; }
.badge-bonsai     { background: #fce4ec; color: #880e4f; }

/* ============================================================
   Category Pills / Filter Buttons
   ============================================================ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 2px solid var(--gray-200);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--green-500);
  color: var(--green-700);
  background: var(--green-100);
}

.filter-btn.active {
  background: var(--green-700);
  border-color: var(--green-700);
  color: var(--white);
}

/* ============================================================
   Category Cards (home page)
   ============================================================ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .category-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
  .category-grid { grid-template-columns: repeat(6, 1fr); }
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
  text-align: center;
  text-decoration: none;
  color: var(--text);
  transition: all var(--transition-spring);
  cursor: pointer;
}

.category-card:hover {
  border-color: var(--green-300);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  color: var(--green-700);
}

.category-icon  { font-size: 2rem; line-height: 1; }
.category-name  { font-size: var(--text-sm); font-weight: 600; line-height: var(--leading-snug); }

/* ============================================================
   Search Input
   ============================================================ */
.search-wrapper {
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 400px;
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 16px;
  height: 16px;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  background: var(--bg-card);
  color: var(--text);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(50, 158, 90, 0.1);
}

.search-input::placeholder { color: var(--gray-300); }

/* ============================================================
   Tree Detail Page Layout
   ============================================================ */
.tree-detail-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 1024px) {
  .tree-detail-layout { grid-template-columns: 280px 1fr; }
}

.tree-sidebar,
.post-layout > aside {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
}

.sidebar-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  margin-bottom: var(--space-4);
}

.sidebar-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--green-100);
}

/* ============================================================
   Table of Contents (sidebar)
   ============================================================ */
.toc-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.toc-list a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
}

.toc-list a:hover,
.toc-list a.toc-active {
  color: var(--green-700);
  background: var(--green-100);
  border-left-color: var(--green-500);
}

/* ============================================================
   Quick Facts Grid
   ============================================================ */
.quick-facts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .quick-facts-grid { grid-template-columns: repeat(3, 1fr); }
}

.quick-fact-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
}

.quick-fact-icon  { font-size: 1.25rem; line-height: 1; }
.quick-fact-label { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); font-weight: 600; }
.quick-fact-value { font-size: var(--text-sm); font-weight: 600; color: var(--text); }

/* ============================================================
   Benefits List (leaf bullets)
   ============================================================ */
.benefits-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.benefit-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.benefit-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--green-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.benefit-content h4 { font-size: var(--text-base); font-weight: 600; color: var(--text); margin-bottom: var(--space-1); }
.benefit-content p  { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

/* CSS leaf bullet for unordered lists in content */
.leaf-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
}

.leaf-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

.leaf-list li::before {
  content: '🍃';
  flex-shrink: 0;
  font-size: 0.9rem;
  margin-top: 2px;
}

/* ============================================================
   Growing Conditions Cards
   ============================================================ */
.growing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .growing-grid { grid-template-columns: repeat(3, 1fr); }
}

.growing-card {
  padding: var(--space-4);
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  text-align: center;
}

.growing-card-icon  { font-size: 1.5rem; margin-bottom: var(--space-2); }
.growing-card-label { font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); margin-bottom: var(--space-1); }
.growing-card-value { font-size: var(--text-sm); font-weight: 500; color: var(--text); }

/* ============================================================
   Breadcrumb
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.breadcrumb-item a { color: var(--green-500); text-decoration: none; transition: color var(--transition); }
.breadcrumb-item a:hover { color: var(--green-700); }
.breadcrumb-separator { color: var(--gray-300); }

/* ============================================================
   Related Trees – Horizontal Scroll
   ============================================================ */
.related-scroll {
  display: flex;
  gap: var(--space-4);
  overflow-x: auto;
  padding-bottom: var(--space-4);
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--green-300) transparent;
  -webkit-overflow-scrolling: touch;
}

.related-scroll::-webkit-scrollbar { height: 4px; }
.related-scroll::-webkit-scrollbar-track { background: transparent; }
.related-scroll::-webkit-scrollbar-thumb { background: var(--green-300); border-radius: var(--radius-full); }

.related-tree-card {
  flex: 0 0 220px;
  scroll-snap-align: start;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--gray-200);
}

.related-tree-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.related-tree-card img { width: 100%; height: 140px; object-fit: cover; }

.related-tree-card-body  { padding: var(--space-3); }
.related-tree-card-title { font-size: var(--text-sm); font-weight: 600; color: var(--text); margin-bottom: 2px; }
.related-tree-card-sci   { font-size: var(--text-xs); color: var(--text-muted); font-style: italic; }

/* ============================================================
   Blog / Listing Grid
   ============================================================ */
.blog-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(3, 1fr); }
}

.results-count {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-6);
}

.results-count strong { color: var(--green-700); font-weight: 600; }

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--text-muted);
}

.empty-state-icon { font-size: 3rem; margin-bottom: var(--space-4); }

.empty-state h3 { font-size: var(--text-xl); color: var(--text); margin-bottom: var(--space-2); }
.empty-state p  { margin-bottom: var(--space-6); line-height: var(--leading-relaxed); }

/* ============================================================
   Feature Cards (Why Treezpedia)
   ============================================================ */
.feature-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid rgba(50, 158, 90, 0.06);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  background: var(--green-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.feature-card h3 { font-size: var(--text-xl); font-weight: 700; }
.feature-card p  { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

/* ============================================================
   Newsletter CTA
   ============================================================ */
.newsletter-section {
  background: linear-gradient(135deg, var(--green-900) 0%, var(--green-700) 100%);
  padding-block: var(--space-20);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.newsletter-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(201, 168, 76, 0.1) 0%, transparent 70%);
}

.newsletter-section .container { position: relative; z-index: 1; }

.newsletter-section h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  color: var(--white);
  margin-bottom: var(--space-4);
}

.newsletter-section p {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.75);
  max-width: 480px;
  margin: 0 auto var(--space-8);
  line-height: var(--leading-relaxed);
}

.newsletter-form {
  display: flex;
  max-width: 440px;
  margin: 0 auto;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.newsletter-form input {
  flex: 1;
  min-width: 200px;
  padding: 0.875rem 1.25rem;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.1);
  color: var(--white);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition);
  font-family: var(--font-sans);
}

.newsletter-form input::placeholder { color: rgba(255,255,255,0.5); }
.newsletter-form input:focus { border-color: rgba(255,255,255,0.5); }

.newsletter-success {
  display: none;
  color: var(--green-300);
  font-weight: 600;
  margin-top: var(--space-4);
  font-size: var(--text-sm);
}

/* ============================================================
   Team Cards
   ============================================================ */
.team-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.team-card-image { width: 100%; height: 240px; object-fit: cover; object-position: top; }

.team-card-body { padding: var(--space-5); }
.team-card-name { font-size: var(--text-xl); font-weight: 700; color: var(--text); margin-bottom: var(--space-1); }
.team-card-role { font-size: var(--text-sm); color: var(--green-500); font-weight: 600; margin-bottom: var(--space-3); }
.team-card-bio  { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

/* ============================================================
   Contact Form
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 1024px) {
  .contact-layout { grid-template-columns: 1fr 380px; }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.form-label { font-size: var(--text-sm); font-weight: 600; color: var(--text); }
.form-label span { color: #e53e3e; margin-left: 2px; }

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: var(--font-sans);
}

.form-control:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(50, 158, 90, 0.1);
}

.form-control.error { border-color: #e53e3e; }

.form-error { font-size: var(--text-xs); color: #e53e3e; display: none; }
.form-error.show { display: block; }

textarea.form-control { resize: vertical; min-height: 140px; }

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235a7060' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-success {
  display: none;
  background: var(--green-100);
  border: 1px solid var(--green-300);
  border-radius: var(--radius);
  padding: var(--space-5);
  text-align: center;
}

.form-success.show { display: block; }
.form-success h3 { color: var(--green-700); font-size: var(--text-xl); margin-bottom: var(--space-2); }
.form-success p  { color: var(--text-muted); font-size: var(--text-sm); }

/* Contact Info Cards */
.contact-info-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-4);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--green-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-info-label { font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); margin-bottom: var(--space-1); }
.contact-info-value { font-size: var(--text-sm); color: var(--text); font-weight: 500; }
.contact-info-value a { color: var(--green-500); text-decoration: none; transition: color var(--transition); }
.contact-info-value a:hover { color: var(--green-700); }

/* ============================================================
   FAQ Accordion
   ============================================================ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition);
}

.faq-question:hover { color: var(--green-700); }
.faq-question.open  { color: var(--green-700); }

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--green-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--green-700);
  transition: transform var(--transition), background var(--transition);
}

.faq-question.open .faq-icon {
  transform: rotate(45deg);
  background: var(--green-700);
  color: var(--white);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer.open { max-height: 400px; }

.faq-answer-inner {
  padding: 0 var(--space-5) var(--space-5);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--green-900);
  color: rgba(255,255,255,0.75);
  padding-block: var(--space-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  margin-bottom: var(--space-4);
}

.footer-tagline {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 280px;
  color: rgba(255,255,255,0.6);
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-5);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--green-300); }

.footer-bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-copyright { font-size: var(--text-sm); color: rgba(255,255,255,0.4); }

.footer-social { display: flex; align-items: center; gap: var(--space-3); }

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.6);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.footer-social a:hover {
  background: var(--green-700);
  color: var(--white);
}

/* ============================================================
   Back to Top Button
   ============================================================ */
#back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--green-700);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  border: none;
  font-size: 1.1rem;
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  z-index: 500;
}

#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

#back-to-top:hover {
  background: var(--green-900);
  transform: translateY(-2px);
}

/* ============================================================
   Rich Content (tree detail article)
   ============================================================ */
.article-content h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text);
  margin: var(--space-10) 0 var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--green-100);
}

.article-content h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  margin: var(--space-6) 0 var(--space-3);
}

.article-content p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}

.article-content p:last-child { margin-bottom: 0; }

.article-hero-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: var(--space-8);
}

/* ============================================================
   Values / About Cards
   ============================================================ */
.values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .values-grid { grid-template-columns: repeat(3, 1fr); }
}

.value-card {
  padding: var(--space-8) var(--space-6);
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  border-top: 4px solid var(--green-300);
  transition: transform var(--transition), box-shadow var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.value-icon   { font-size: 2.5rem; margin-bottom: var(--space-4); }
.value-card h3 { font-size: var(--text-xl); font-weight: 700; color: var(--text); margin-bottom: var(--space-3); }
.value-card p  { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

/* ============================================================
   Interesting Facts / Callout Box
   ============================================================ */
.facts-callout {
  background: linear-gradient(135deg, var(--green-100) 0%, var(--gold-pale) 100%);
  border-radius: var(--radius);
  padding: var(--space-6);
  border-left: 4px solid var(--gold);
}

.facts-callout h3 { font-size: var(--text-xl); font-weight: 700; color: var(--text); margin-bottom: var(--space-4); }

.facts-callout ol {
  list-style: decimal;
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.facts-callout ol li { font-size: var(--text-sm); color: var(--text-muted); line-height: var(--leading-relaxed); }

/* ============================================================
   Responsive Overrides
   ============================================================ */
@media (min-width: 768px) {
  .hero-cta-group   { flex-wrap: nowrap; }
  .newsletter-form  { flex-wrap: nowrap; }
}

@media (max-width: 639px) {
  .section            { padding-block: var(--space-12); }
  .section-title      { font-size: var(--text-2xl); }
  .hero-leaf-bg,
  .hero-leaf-bg-left  { display: none; }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
  .navbar,
  .footer,
  .mobile-menu,
  #back-to-top,
  #reading-progress,
  .newsletter-section,
  .related-scroll,
  .breadcrumb,
  .filter-bar,
  .hero-cta-group { display: none !important; }

  body { background: white; color: black; font-size: 12pt; }
  a    { color: black; text-decoration: underline; }

  .hero, .hero-sm {
    background: #f0f0f0 !important;
    color: black !important;
    padding-block: 2rem;
  }

  .hero h1, .hero-sm h1 { color: black !important; }

  .tree-card, .feature-card, .sidebar-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  .tree-detail-layout { grid-template-columns: 1fr !important; }
  .tree-sidebar { position: static; }
}

/* ============================================================
   Tree Detail Pages — Additional Styles & Aliases
   (tree pages use slightly different class names; aliases
    allow both naming conventions to coexist)
   ============================================================ */

/* Progress bar alias (tree pages use class="progress-bar") */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--green-500), var(--gold));
  z-index: 9999;
  transition: width 0.1s linear;
}

/* Hamburger spans without explicit class (tree pages) */
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Navbar class aliases (tree pages use nav-container / nav-logo / nav-links) */
.nav-container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: var(--nav-height);
}
@media (min-width: 640px) { .nav-container { padding-inline: var(--space-6); } }
@media (min-width: 768px) { .nav-container { padding-inline: var(--space-8); } }

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--green-900);
  text-decoration: none;
  transition: color var(--transition);
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--green-500); }

.nav-links {
  display: none;
  list-style: none;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}
@media (min-width: 768px) { .nav-links { display: flex; } }

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--green-700); background: var(--green-100); }

/* Footer column alias: bare <div> inside footer-grid */
.footer-grid > div h4 {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-5);
}
.footer-grid > div ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-grid > div ul a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color var(--transition);
}
.footer-grid > div ul a:hover { color: var(--green-300); }

/* ---- Category Badge ---- */
.category-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--green-100);
  color: var(--green-700);
}
.category-badge.small { font-size: 0.65rem; padding: 0.15rem 0.5rem; }

/* ---- Breadcrumb Bar ---- */
.breadcrumb-bar {
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
  padding-block: var(--space-3);
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.breadcrumb a { color: var(--green-500); text-decoration: none; }
.breadcrumb a:hover { color: var(--green-700); }
.breadcrumb span { color: var(--text); font-weight: 500; }

/* ---- Tree Hero ---- */
.tree-hero {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
@media (min-width: 768px) { .tree-hero { min-height: 560px; } }

.tree-hero-image {
  position: absolute;
  inset: 0;
}
.tree-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.tree-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 26, 15, 0.88) 0%,
    rgba(10, 26, 15, 0.45) 50%,
    rgba(10, 26, 15, 0.1) 100%
  );
}
.tree-hero-content {
  position: relative;
  z-index: 2;
  color: var(--white);
  padding-block: var(--space-12);
}
.tree-hero-content .category-badge {
  background: rgba(125, 212, 160, 0.25);
  color: var(--green-300);
  border: 1px solid rgba(125, 212, 160, 0.4);
  margin-bottom: var(--space-4);
}
.tree-hero-content h1 {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 900;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-3);
}
@media (min-width: 768px) {
  .tree-hero-content h1 { font-size: var(--text-5xl); }
}

.scientific-name {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.75);
  margin-bottom: var(--space-5);
  font-style: italic;
}
.tree-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
}
.tree-meta span { display: flex; align-items: center; gap: var(--space-1); }

/* ---- Tree Page Layout (sidebar first in DOM → 280px | 1fr) ---- */
.tree-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
  padding-block: var(--space-12);
}
@media (min-width: 1024px) {
  .tree-layout { grid-template-columns: 280px 1fr; }
}

/* ---- Blog Post Layout (sidebar left, content right — mirrors tree pages) ----
   Article is first in DOM (SEO/mobile), aside is second.
   CSS order flips them visually at desktop: aside → left 280px, article → right 1fr */
.post-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
  padding-block: var(--space-20);
}
@media (min-width: 1024px) {
  .post-layout { grid-template-columns: 280px 1fr; }
  .post-layout > article,
  .post-layout > .tree-article,
  .post-layout > .tree-main { order: 2; }
  .post-layout > aside { order: 1; }
}

/* ---- TOC Card (sidebar) ---- */
.toc-card,
.quick-facts-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  margin-bottom: var(--space-5);
}
.toc-card h3,
.quick-facts-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--green-100);
}

/* ---- Quick Fact Items ---- */
.fact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--gray-100);
}
.fact-item:last-child { border-bottom: none; }
.fact-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 2px; }
.fact-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 600;
}
.fact-value { font-size: var(--text-sm); font-weight: 600; color: var(--text); }

/* ---- Tree Content ---- */
.tree-content { min-width: 0; }

.content-section {
  margin-bottom: var(--space-12);
}
.content-section h2 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--green-100);
}
@media (min-width: 768px) {
  .content-section h2 { font-size: var(--text-3xl); }
}
.content-section p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  margin-bottom: var(--space-5);
}
.content-section p:last-child { margin-bottom: 0; }
.content-section p em { font-style: italic; color: var(--text); }

/* ---- Benefits Grid ---- */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
@media (min-width: 640px) {
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
}

.benefit-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--green-300);
  transition: transform var(--transition), box-shadow var(--transition);
}
.benefit-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.benefit-card .benefit-icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-3);
  display: block;
}
.benefit-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-2);
}
.benefit-card p {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* ---- Growing Conditions Grid ---- */
.conditions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
@media (min-width: 640px) {
  .conditions-grid { grid-template-columns: repeat(3, 1fr); }
}

.condition-card {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  text-align: center;
  border: 1px solid var(--gray-100);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.condition-card:hover {
  border-color: var(--green-300);
  box-shadow: var(--shadow);
}
.condition-icon { font-size: 1.5rem; margin-bottom: var(--space-2); display: block; }
.condition-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: var(--space-1);
}
.condition-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
  line-height: var(--leading-snug);
}

/* ---- Interesting Facts List ---- */
.facts-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.facts-list li {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--green-300);
}
.facts-list li::before {
  content: '🌿';
  flex-shrink: 0;
  font-size: 1rem;
  margin-top: 2px;
}

/* ---- FAQ ---- */
.faq-container { display: flex; flex-direction: column; gap: var(--space-3); }

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: 1px solid var(--gray-100);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background var(--transition);
}
.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--green-500);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-question:hover { background: var(--gray-100); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding var(--transition);
}
.faq-item.open .faq-answer { max-height: 400px; }
.faq-answer p {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--text-muted);
  margin: 0;
}

/* ---- Article Tags ---- */
.article-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-8);
  border-top: 1px solid var(--gray-100);
  margin-top: var(--space-8);
  font-size: var(--text-sm);
  color: var(--text-muted);
}
.article-tags strong { margin-right: var(--space-1); }
.article-tags .tag { text-decoration: none; }

/* ---- Related Trees ---- */
.related-trees {
  background: var(--gray-100);
  padding-block: var(--space-16);
}
.related-trees h2 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-8);
  text-align: center;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 640px) { .related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .related-grid { grid-template-columns: repeat(3, 1fr); } }

.related-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.related-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}
.related-card:hover img { transform: scale(1.04); }

.related-card-body {
  padding: var(--space-4) var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.related-card-body h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text);
  transition: color var(--transition);
}
.related-card:hover .related-card-body h3 { color: var(--green-700); }

.sci-name {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-style: italic;
}

/* ---- Reveal animation ---- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   Blog Post Article Styles
   ============================================================ */

/* Article body typography */
.article-body h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 700;
  color: var(--text);
  margin: 2.5rem 0 1rem;
  line-height: 1.3;
}

.article-body h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 600;
  color: var(--text);
  margin: 2rem 0 0.75rem;
  line-height: 1.4;
}

.article-body h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  line-height: 1.8;
  color: var(--text-body, var(--text));
  margin-bottom: 1.25rem;
}

.article-body ul,
.article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.article-body li {
  line-height: 1.7;
  margin-bottom: 0.5rem;
  color: var(--text-body, var(--text));
}

.article-body strong {
  font-weight: 700;
  color: var(--text);
}

.article-body a {
  color: var(--primary-600, var(--green-700));
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--primary-800, var(--green-900));
}

/* Table styles */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.article-body th {
  background: var(--primary-50);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 700;
  color: var(--text);
  border-bottom: 2px solid var(--border-light);
}

.article-body td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-body, var(--text));
  vertical-align: top;
}

.article-body tr:last-child td { border-bottom: none; }
.article-body tr:nth-child(even) td { background: var(--bg-subtle, #f9fafb); }

/* Quick answer box */
.quick-answer-box {
  background: var(--primary-50);
  border-left: 4px solid var(--primary-500, var(--green-600));
  border-radius: 0 8px 8px 0;
  padding: 20px 24px;
  margin-bottom: 32px;
}

/* FAQ accordion in article */
.faq-section {
  margin: 2rem 0;
}

.faq-item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: var(--bg-card);
  border: none;
  padding: 18px 20px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: background var(--transition);
}

.faq-question:hover { background: var(--primary-50); }
.faq-question[aria-expanded="true"] { background: var(--primary-50); color: var(--primary-700, var(--green-800)); }

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--primary-500, var(--green-600));
  flex-shrink: 0;
  transition: transform 0.25s ease;
}
.faq-question[aria-expanded="true"]::after {
  content: '−';
}

.faq-answer {
  display: none;
  padding: 4px 20px 20px;
  background: var(--bg-card);
  color: var(--text-body, var(--text));
  line-height: 1.7;
}
.faq-answer.open { display: block; }
.faq-answer p { margin-bottom: 0.75rem; }
.faq-answer p:last-child { margin-bottom: 0; }

/* Info boxes */
.info-box {
  background: var(--primary-50);
  border: 1px solid var(--primary-200, var(--green-200));
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 1.5rem 0;
}

.info-box.warning {
  background: #fffbeb;
  border-color: #fde68a;
}

.info-box.danger {
  background: #fef2f2;
  border-color: #fecaca;
}

.info-box-title {
  font-weight: 700;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

/* Post breadcrumb */
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 4px;
  color: var(--border-light);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--primary-600, var(--green-700)); }
.breadcrumb li:last-child { color: var(--text); font-weight: 500; }