:root {
  --bg-canvas: #eef7f2;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f9fcfa;
  --text-primary: #1f2937;
  --text-muted: #4b5563;
  --accent-primary: #14532d;
  --accent-secondary: #15803d;
  --accent-soft: #dcfce7;
  --border-subtle: rgba(20, 83, 45, 0.12);
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-elevation: 0 12px 32px -4px rgba(20, 83, 45, 0.12);
  --shadow-soft: 0 4px 16px rgba(20, 83, 45, 0.06);
  --glow-accent: 0 0 24px -4px rgba(20, 83, 45, 0.2);
  --glass-backdrop: blur(16px) saturate(180%);
  --radius: 4px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; color: var(--text-primary); background-color: var(--bg-canvas); line-height: 1.65; scroll-behavior: smooth; }
body { background-color: var(--bg-canvas); color: var(--text-primary); overflow-wrap: anywhere; hyphens: auto; position: relative; }

h1, h2, h3, h4 { font-weight: 800; letter-spacing: -0.025em; line-height: 1.2; color: var(--text-primary); margin-bottom: 0.75rem; }
h1 { font-size: clamp(2rem, 4vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.15rem); margin-top: 1.5rem; }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); }
p { margin-bottom: 1.15rem; color: var(--text-primary); }
ul, ol { margin: 0 0 1.25rem 1.5rem; }
li { margin-bottom: 0.5rem; }
a { color: var(--accent-primary); text-decoration: none; transition: color 0.2s var(--ease-kinetic); }

.ambient-bg { background-image: radial-gradient(circle at 80% 15%, rgba(21, 128, 61, 0.12) 0%, transparent 45%), radial-gradient(circle at 15% 85%, rgba(20, 83, 45, 0.1) 0%, transparent 50%); }

/* Header - Strictly Static/Relative, Left Brand, Centered Row Below */
.site-header { position: relative; width: 100%; background: var(--bg-surface); border-bottom: 1px solid var(--border-subtle); padding: 1rem 1.5rem 0.75rem; }
.header-inner { max-width: 1200px; margin: 0 auto; }
.header-top { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.brand-link { display: inline-flex; align-items: center; gap: 0.65rem; font-weight: 800; font-size: 1.35rem; letter-spacing: -0.03em; color: var(--accent-primary); text-align: left; }
.brand-mark { width: 28px; height: 28px; background: var(--accent-primary); color: #fff; border-radius: var(--radius); display: inline-flex; align-items: center; justify-content: center; font-size: 0.9rem; font-weight: 800; }

.menu-dots-btn { display: none; background: var(--bg-canvas); border: 1px solid var(--border-subtle); border-radius: var(--radius); padding: 0.35rem 0.7rem; font-size: 1.3rem; line-height: 1; color: var(--accent-primary); cursor: pointer; }
.site-nav { margin-top: 0.75rem; padding-top: 0.65rem; border-top: 1px solid var(--border-subtle); display: flex; justify-content: center; align-items: center; gap: 2rem; flex-wrap: wrap; }
.site-nav a { font-weight: 600; font-size: 0.95rem; color: var(--text-primary); position: relative; padding-bottom: 2px; }
.site-nav a::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 2px; background: var(--accent-primary); transition: width 0.25s var(--ease-kinetic); }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { width: 100%; }

/* Containers & Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 2.5rem 1.5rem; }
.reading-width { max-width: 70ch; margin: 0 auto; }

/* Hero */
.hero-split { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2.5rem; align-items: center; padding: 2rem 0 3rem; background: radial-gradient(circle at 75% 50%, rgba(21, 128, 61, 0.14), transparent 65%); }
.hero-copy p { font-size: 1.15rem; color: var(--text-muted); max-width: 58ch; }
.hero-actions { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; margin-top: 1.5rem; }
.hero-visual img, .card-img { width: 100%; height: auto; border-radius: var(--radius); object-fit: cover; display: block; box-shadow: var(--shadow-soft); background-color: #dfeee6; }
.aspect-16-9 { aspect-ratio: 16 / 9; }
.aspect-4-3 { aspect-ratio: 4 / 3; }
.aspect-1-1 { aspect-ratio: 1 / 1; }

/* Buttons & Links */
.btn-primary { display: inline-block; background: var(--accent-primary); color: #ffffff; font-weight: 700; padding: 0.8rem 1.5rem; border-radius: var(--radius); border: none; cursor: pointer; transition: transform 0.25s var(--ease-kinetic), box-shadow 0.25s var(--ease-kinetic), background-color 0.2s; }
.btn-primary:hover { background: var(--accent-secondary); transform: translateY(-3px); box-shadow: var(--shadow-elevation); color: #ffffff; }
.link-secondary { font-weight: 700; color: var(--accent-primary); position: relative; display: inline-block; padding-bottom: 2px; }
.link-secondary::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0%; height: 2px; background: var(--accent-primary); transition: width 0.3s var(--ease-kinetic); }
.link-secondary:hover::after { width: 100%; }

/* Bento Grid & Cards */
.bento-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.5rem; margin: 1.5rem 0 3rem; }
.span-8 { grid-column: span 8; }
.span-6 { grid-column: span 6; }
.span-4 { grid-column: span 4; }
.span-12 { grid-column: span 12; }

.auto-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin: 1.5rem 0 2.5rem; }

.tile { background: var(--bg-surface); border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow-soft); border: none; transition: transform 0.3s var(--ease-kinetic), box-shadow 0.3s var(--ease-kinetic); display: flex; flex-direction: column; justify-content: space-between; }
.tile:hover { transform: translateY(-5px) scale(1.01); box-shadow: var(--shadow-elevation), var(--glow-accent); }
.tag { display: inline-block; background: var(--accent-soft); color: var(--accent-primary); font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; padding: 0.25rem 0.6rem; border-radius: var(--radius); margin-bottom: 0.75rem; width: fit-content; }

/* Components: Filename Before/After, Decision Tree, Checklist */
.filename-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1rem 0; }
.code-box { padding: 0.9rem 1rem; border-radius: var(--radius); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 0.88rem; background: var(--bg-canvas); border-left: 4px solid var(--accent-primary); }
.code-box.before { border-left-color: #b45309; background: #fef3c7; color: #78350f; }
.code-box.after { border-left-color: var(--accent-primary); background: var(--accent-soft); color: var(--accent-primary); }

.decision-tree { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1rem; }
.decision-node { background: var(--bg-canvas); padding: 1.15rem; border-radius: var(--radius); border-top: 3px solid var(--accent-primary); }

.checklist-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.65rem 0; border-bottom: 1px solid var(--border-subtle); }
.checklist-item input[type="checkbox"] { accent-color: var(--accent-primary); width: 1.15rem; height: 1.15rem; margin-top: 0.25rem; border-radius: var(--radius); }

.reset-section { background: radial-gradient(circle at 50% 50%, rgba(21, 128, 61, 0.14), transparent 70%); padding: 2rem 0; }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; background: var(--bg-surface); border-radius: var(--radius); box-shadow: var(--shadow-soft); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 0.9rem 1rem; border-bottom: 1px solid var(--border-subtle); }
th { background: var(--accent-soft); color: var(--accent-primary); font-weight: 800; }

/* Forms */
.form-group { margin-bottom: 1.25rem; }
label { display: block; font-weight: 700; margin-bottom: 0.4rem; }
input[type="text"], input[type="email"], select, textarea { width: 100%; padding: 0.75rem 0.9rem; border: 1px solid rgba(20, 83, 45, 0.25); border-radius: var(--radius); background: var(--bg-surface); font-family: inherit; font-size: 1rem; color: var(--text-primary); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-primary); border-color: transparent; }
.message-preview { background: var(--bg-canvas); padding: 1.25rem; border-radius: var(--radius); font-family: monospace; white-space: pre-wrap; margin: 1rem 0; border: 1px solid var(--border-subtle); }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--ease-kinetic), transform 0.6s var(--ease-kinetic); }
.reveal-visible { opacity: 1; transform: translateY(0); }

/* Footer */
.site-footer { background: var(--bg-surface); border-top: 1px solid var(--border-subtle); padding: 3rem 1.5rem; margin-top: 4rem; font-size: 0.92rem; color: var(--text-muted); }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 2rem; }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-bottom { max-width: 1200px; margin: 2rem auto 0; padding-top: 1.5rem; border-top: 1px solid var(--border-subtle); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .span-8, .span-6, .span-4 { grid-column: span 6; }
  .hero-split { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .menu-dots-btn { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav { display: none; flex-direction: column; align-items: flex-start; gap: 0.85rem; padding: 1rem 0 0.5rem; }
  .site-nav.nav-open { display: flex; }
  .span-8, .span-6, .span-4, .span-12 { grid-column: span 12; }
  .filename-compare, .footer-inner { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .container { padding: 1.5rem 1rem; }
  .tile { padding: 1.25rem; }
}

@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}