:root {
  --bg-canvas: #f7f5f0;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f0ece1;
  --text-primary: #111111;
  --text-muted: #4a4843;
  --accent-primary: #d62828;
  --accent-secondary: #9e1b1b;
  --border-subtle: #111111;
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-hard: 4px 4px 0 #111111;
  --radius-card: 20px;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, Consolas, "Courier New", monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--bg-canvas); color: var(--text-primary); font-family: var(--font-body); line-height: 1.6; overflow-wrap: anywhere; hyphens: auto; }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-card); border: 1px solid var(--border-subtle); object-fit: cover; }
a { color: var(--text-primary); text-decoration: underline; text-decoration-color: var(--accent-primary); text-underline-offset: 4px; transition: color 0.2s; }
a:hover { color: var(--accent-primary); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.prose { max-width: 70ch; margin: 0 auto; }
.mono-label, .step-num, h3.small-head { font-family: var(--font-mono); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); display: inline-block; margin-bottom: 8px; }
.step-num { background: var(--accent-primary); color: #ffffff; padding: 2px 10px; border-radius: 99px; font-weight: 700; border: 1px solid var(--border-subtle); }

header.site-header { position: relative; border-bottom: 1px solid var(--border-subtle); background: var(--bg-canvas); padding: 20px 0 0; }
.masthead-top { display: flex; justify-content: space-between; align-items: center; padding-bottom: 16px; }
.brand-link { font-family: var(--font-mono); font-weight: 800; font-size: 1.25rem; text-decoration: none; color: var(--text-primary); display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 18px; height: 18px; background: var(--accent-primary); border: 1px solid var(--border-subtle); border-radius: 50%; display: inline-block; }
.nav-row { border-top: 1px solid var(--border-subtle); padding: 12px 0; display: flex; justify-content: center; gap: 28px; flex-wrap: wrap; }
.nav-row a { font-family: var(--font-mono); font-size: 0.9rem; text-decoration: none; font-weight: 600; padding: 4px 8px; border-radius: 8px; }
.nav-row a:hover, .nav-row a[aria-current="page"] { background: var(--accent-primary); color: #ffffff; }
.menu-toggle { display: none; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: 10px; padding: 6px 12px; font-size: 1.25rem; cursor: pointer; line-height: 1; }

.hero-oversized { padding: 64px 0 48px; border-bottom: 1px solid var(--border-subtle); }
.hero-card { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-card); padding: 48px; }
h1 { font-size: clamp(2.25rem, 5vw, 4rem); line-height: 1.08; letter-spacing: -0.02em; margin-bottom: 20px; font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); line-height: 1.2; margin-bottom: 16px; font-weight: 700; }
h3 { font-size: 1.25rem; margin-bottom: 10px; font-weight: 700; }
p { margin-bottom: 16px; }

.btn { display: inline-block; background: var(--accent-primary); color: #ffffff !important; font-family: var(--font-mono); font-weight: 700; font-size: 0.95rem; text-decoration: none; padding: 14px 26px; border-radius: var(--radius-card); border: 1px solid var(--border-subtle); box-shadow: var(--shadow-hard); transition: transform 0.15s, box-shadow 0.15s; cursor: pointer; }
.btn:hover { transform: translate(4px, 4px); box-shadow: 0 0 0 #111111; }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary) !important; }

.section-block { padding: 56px 0; }
.red-band { background: var(--accent-primary); color: #ffffff; padding: 36px 0; border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle); }
.red-band h2, .red-band p, .red-band .mono-label { color: #ffffff; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.lesson-card { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-card); padding: 28px; display: flex; flex-direction: column; justify-content: space-between; }
.lesson-card img { margin-bottom: 18px; aspect-ratio: 4 / 3; width: 100%; }
.img-banner { aspect-ratio: 16 / 9; width: 100%; margin: 24px 0; }
.img-square { aspect-ratio: 1 / 1; width: 100%; }

.table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--border-subtle); border-radius: var(--radius-card); background: var(--bg-surface); }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.95rem; }
th, td { padding: 14px 18px; border-bottom: 1px solid var(--border-subtle); }
th { font-family: var(--font-mono); background: var(--bg-surface-hover); font-size: 0.85rem; text-transform: uppercase; }
tr:last-child td { border-bottom: none; }

.checklist { list-style: none; margin: 16px 0; }
.checklist li { padding: 10px 0; border-bottom: 1px dashed var(--border-subtle); display: flex; gap: 12px; align-items: baseline; }
.checklist li::before { content: "[✓]"; font-family: var(--font-mono); color: var(--accent-primary); font-weight: 700; }

.def-row { display: grid; grid-template-columns: 220px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border-subtle); }
.def-term { font-family: var(--font-mono); font-weight: 700; color: var(--accent-primary); }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-family: var(--font-mono); font-size: 0.85rem; margin-bottom: 6px; font-weight: 700; }
.form-control { width: 100%; padding: 12px 16px; border: 1px solid var(--border-subtle); border-radius: 12px; background: var(--bg-surface); font-family: var(--font-body); font-size: 1rem; }
.preview-box { background: var(--bg-surface-hover); border: 1px solid var(--border-subtle); border-radius: var(--radius-card); padding: 20px; font-family: var(--font-mono); font-size: 0.9rem; white-space: pre-wrap; margin-top: 16px; }

.site-footer { border-top: 1px solid var(--border-subtle); background: var(--bg-surface); padding: 48px 0 32px; margin-top: 64px; font-size: 0.9rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 32px; margin-bottom: 32px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.disclaimer-note { font-size: 0.82rem; color: var(--text-muted); border-top: 1px solid var(--border-subtle); padding-top: 20px; margin-top: 20px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.5s var(--ease-kinetic), transform 0.5s var(--ease-kinetic); }
.reveal-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 767px) {
  .menu-toggle { display: inline-block; }
  .nav-row { display: none; flex-direction: column; gap: 8px; padding: 16px; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-card); margin-bottom: 16px; }
  .nav-row.nav-open { display: flex; }
  .hero-card { padding: 28px 20px; }
  .def-row { grid-template-columns: 1fr; gap: 4px; }
}

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