/* ============================================================
   Vargas Code · 3 variantes
   1) Editorial  — claro, serifa display + plex sans
   2) Studio     — escuro, mono + sans, vibe técnica
   3) Brutalist  — alto contraste, archivo black, grid grosso
   ============================================================ */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background: var(--bg);
  color: var(--fg);
  transition: background .35s ease, color .35s ease;
}

/* default vars (editorial light) */
:root {
  --accent: #1f8a5b;
  --accent-on: #ffffff;
  --bg: #f7f5ef;
  --fg: #0f1c2e;
  --fg-mute: #5b6675;
  --fg-soft: #8a93a0;
  --rule: #d9d4c5;
  --card: #ffffff;
  --card-soft: #efece3;
  --navy: #0f1c2e;
}

/* font pairings driven by tweak */
body[data-font="modern"]  { --f-display: 'Instrument Serif', Georgia, serif; --f-body: 'IBM Plex Sans', sans-serif; --f-mono: 'IBM Plex Mono', monospace; }
body[data-font="classic"] { --f-display: 'Archivo', sans-serif; --f-body: 'IBM Plex Sans', sans-serif; --f-mono: 'IBM Plex Mono', monospace; }
body[data-font="techno"]  { --f-display: 'Space Grotesk', sans-serif; --f-body: 'Space Grotesk', sans-serif; --f-mono: 'JetBrains Mono', monospace; }

/* ===================== TOP NAV ===================== */
.topnav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid color-mix(in oklab, var(--fg) 8%, transparent);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); }
.brand-mark { width: 28px; height: 28px; object-fit: contain; }
.brand-text { font-size: 15px; letter-spacing: .01em; }
.brand-text b { font-weight: 700; }
.brand-text i { font-style: normal; color: var(--accent); font-weight: 600; margin-left: 2px; }

.variant-tabs {
  display: inline-flex; gap: 2px;
  padding: 4px; border-radius: 999px;
  background: color-mix(in oklab, var(--fg) 6%, transparent);
}
.vt {
  appearance: none; border: 0; background: transparent;
  color: var(--fg-mute); font: 500 12.5px/1 'IBM Plex Sans', sans-serif;
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  letter-spacing: .02em;
}
.vt:hover { color: var(--fg); }
.vt.active { background: var(--fg); color: var(--bg); }

/* Editorial nav links (simplified single-variant nav) */
.ed-nav-links {
  display: inline-flex; gap: 28px; align-items: center;
}
.ed-nav-links a {
  font: 500 13px/1 'IBM Plex Sans', sans-serif;
  color: var(--fg-mute); text-decoration: none;
  letter-spacing: .02em;
  transition: color .15s;
}
.ed-nav-links a:hover { color: var(--fg); }

.nav-cta {
  font: 500 13px/1 'IBM Plex Sans', sans-serif;
  color: var(--fg); text-decoration: none;
  padding: 9px 16px; border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--fg) 18%, transparent);
}
.nav-cta:hover { background: var(--fg); color: var(--bg); }

/* show/hide variants */
.variant { display: none; }
.variant.active { display: block; }

/* ====================================================== */
/* ============ VARIANT 1 : EDITORIAL =================== */
/* ====================================================== */

.variant-editorial {
  font-family: var(--f-body);
}

/* ----- HERO ----- */
.ed-hero {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 40px 60px;
  display: grid; grid-template-columns: 80px 1fr;
  gap: 24px;
}
.ed-hero-rail { padding-top: 8px; }
.ed-eyebrow {
  font-family: var(--f-mono);
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
}
.ed-hero-title {
  grid-column: 2;
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(40px, 6.5vw, 88px);
  line-height: .98;
  letter-spacing: -0.02em;
  margin: 0 0 48px;
  color: var(--fg);
  text-wrap: balance;
}
.ed-hero-title em { font-style: italic; color: var(--accent); }
.ed-hero-meta {
  grid-column: 2;
  display: grid; grid-template-columns: 1.6fr 1fr;
  gap: 60px;
  border-top: 1px solid var(--rule);
  padding-top: 28px;
}
.ed-hero-lede {
  font-size: 17px; line-height: 1.55; max-width: 52ch;
  margin: 0; color: var(--fg-mute);
  text-wrap: pretty;
}
.ed-stats { display: grid; grid-template-columns: repeat(2, auto); gap: 20px 44px; margin: 0; align-content: start; }
.ed-stats div { display: flex; flex-direction: column; }
.ed-stats dt {
  font-family: var(--f-display); font-size: 38px; line-height: 1;
  color: var(--fg); margin-bottom: 8px;
}
.ed-stats dd {
  margin: 0; font-family: var(--f-mono);
  font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--fg-soft);
}

/* ----- SECTION HEAD ----- */
.ed-section-head {
  max-width: 1200px; margin: 0 auto;
  padding: 60px 40px 28px;
  display: grid; grid-template-columns: 80px 1fr auto;
  align-items: end; gap: 24px;
  border-bottom: 1px solid var(--rule);
}
.ed-section-tag {
  font-family: var(--f-mono);
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
}
.ed-section-head h2 {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1; letter-spacing: -0.015em;
}
.ed-section-count {
  font-family: var(--f-mono);
  font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--fg-soft);
}
a.ed-section-count { text-decoration: none; transition: color .15s; }
a.ed-section-count:hover { color: var(--accent); }

/* Linha de contexto opcional logo abaixo do cabeçalho de seção. */
.ed-section-lead {
  max-width: 1200px; margin: 18px auto 0;
  padding: 0 40px;
  font-size: 16px; line-height: 1.55;
  color: var(--fg-mute);
  text-wrap: pretty;
}

/* ----- PORTFOLIO GRID ----- */
.ed-portfolio { padding-bottom: 40px; }
.ed-grid {
  max-width: 1200px; margin: 32px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.ed-card {
  display: flex; flex-direction: column;
  border-radius: 16px;
  overflow: hidden;
  background: var(--card);
  box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 12px 30px -18px rgba(15,28,46,.18);
  transition: transform .25s ease, box-shadow .25s ease;
}
.ed-card:hover { transform: translateY(-3px); box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 22px 40px -18px rgba(15,28,46,.28); }
.ed-card-banner {
  height: 110px;
  position: relative;
  background: var(--app-color);
}
.ed-card-icon {
  position: absolute; left: 22px; bottom: -22px;
  width: 64px; height: 64px;
  border-radius: 16px;
  background: #fff;
  display: grid; place-items: center;
  box-shadow: 0 6px 18px rgba(0,0,0,.18), 0 0 0 1px rgba(0,0,0,.04);
  overflow: hidden;
}
.ed-card-icon img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.ed-card-body { padding: 36px 22px 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.ed-card-tag {
  align-self: flex-start;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--app-color);
  background: color-mix(in oklab, var(--app-color) 12%, transparent);
  padding: 5px 10px; border-radius: 999px;
}
.ed-card-name { margin: 0; font-family: var(--f-display); font-size: 24px; font-weight: 600; line-height: 1.1; color: var(--fg); }
.ed-card-desc { margin: 0; font-size: 15px; line-height: 1.55; color: var(--fg-mute); flex: 1; }
.ed-card-cta {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  margin-top: 8px;
  background: var(--accent); color: var(--accent-on);
  font: 500 15px/1 var(--f-body);
  text-decoration: none;
  padding: 13px 16px; border-radius: 10px;
  transition: background .2s;
}
.ed-card-cta:hover { filter: brightness(.92); }
.ed-card-cta::before {
  content: ''; width: 0; height: 0;
  border-left: 8px solid currentColor;
  border-top: 5px solid transparent; border-bottom: 5px solid transparent;
}

/* ----- BOOKS ----- */
.ed-books { padding-bottom: 40px; }
.ed-books-grid {
  max-width: 1200px; margin: 32px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.ed-book {
  display: grid; grid-template-columns: 1fr 1.4fr;
  gap: 18px; align-items: start;
}
.ed-book-cover {
  aspect-ratio: 2/3;
  border-radius: 6px;
  background: var(--book-color, var(--accent));
  position: relative; overflow: hidden;
  box-shadow: 0 12px 30px -16px rgba(15,28,46,.4);
}
.ed-book-cover img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; display: block;
  cursor: zoom-in;
}
.ed-book-cover::before {
  content: ''; position: absolute; inset: 0;
  background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 14px, transparent 14px 28px);
}
.ed-book-cover-title {
  position: absolute; left: 14px; right: 14px; top: 18px;
  font-family: var(--f-display); font-size: 16px; line-height: 1.1;
  color: rgba(255,255,255,.95); letter-spacing: -0.01em;
}
.ed-book-cover-foot {
  position: absolute; left: 14px; right: 14px; bottom: 14px;
  font-family: var(--f-mono); font-size: 9px; letter-spacing: .12em; text-transform: uppercase;
  color: rgba(255,255,255,.7);
}
.ed-book-meta { padding-top: 4px; display: flex; flex-direction: column; gap: 8px; }
.ed-book-tag {
  align-self: flex-start;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--fg-soft);
}
.ed-book-name { margin: 0; font-family: var(--f-display); font-size: 22px; line-height: 1.1; color: var(--fg); }
.ed-book-desc { margin: 0; font-size: 15px; line-height: 1.5; color: var(--fg-mute); }
.ed-book-link { font-family: var(--f-mono); font-size: 12px; color: var(--accent); text-decoration: none; letter-spacing: .04em; margin-top: 4px; }
.ed-book-link:hover { text-decoration: underline; }

/* ----- CURSOS ----- */
.ed-courses { padding-bottom: 40px; }
.ed-courses-grid {
  max-width: 1200px; margin: 28px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.ed-course {
  display: flex; flex-direction: column;
  border-radius: 16px; overflow: hidden;
  background: var(--card);
  box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 12px 30px -18px rgba(15,28,46,.18);
  transition: transform .25s cubic-bezier(.2,.7,.2,1), box-shadow .25s ease;
}
.ed-course:hover { transform: translateY(-3px); box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 22px 40px -18px rgba(15,28,46,.28); }
.ed-course.is-soon { opacity: .68; }
.ed-course.is-soon:hover { transform: none; box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 12px 30px -18px rgba(15,28,46,.18); }
.ed-course-cover {
  position: relative;
  min-height: 134px;
  padding: 16px 18px;
  display: flex; flex-direction: column; justify-content: space-between;
}
.ed-course-cover::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 38%, rgba(0,0,0,.24) 100%);
}
.ed-course-code {
  position: relative; z-index: 1; align-self: flex-start;
  font-family: var(--f-mono); font-size: 11px; font-weight: 500; letter-spacing: .12em;
  color: rgba(255,255,255,.92);
  background: rgba(255,255,255,.18);
  padding: 4px 9px; border-radius: 6px;
}
.ed-course-cover-text { position: relative; z-index: 1; }
.ed-course-cover-title {
  margin: 0; font-family: var(--f-display); font-weight: 600;
  font-size: 21px; line-height: 1.08; letter-spacing: -0.01em; color: #fff;
}
.ed-course-cover-sub {
  margin: 5px 0 0; font-family: var(--f-mono); font-size: 11px; letter-spacing: .03em;
  color: rgba(255,255,255,.82);
}
.ed-course-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.ed-course-meta {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .03em; color: var(--fg-soft);
}
.ed-course-dot { width: 3px; height: 3px; border-radius: 50%; background: currentColor; opacity: .55; }
.ed-course-desc { margin: 0; font-size: 14px; line-height: 1.55; color: var(--fg-mute); flex: 1; }
.ed-course-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 4px; }
.ed-course-pill {
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--fg-mute); background: var(--card-soft);
  padding: 6px 10px; border-radius: 999px; white-space: nowrap;
}
.ed-course-pill--free { color: var(--accent); background: color-mix(in oklab, var(--accent) 12%, transparent); }
.ed-course-pill--soon { color: var(--fg-soft); }
.ed-course-cta {
  font-family: var(--f-mono); font-size: 12px; letter-spacing: .03em;
  color: var(--accent); text-decoration: none; white-space: nowrap;
}
.ed-course-cta:hover { text-decoration: underline; }
.ed-course-cta--soon { color: var(--fg-soft); cursor: default; }
.ed-course-cta--soon:hover { text-decoration: none; }

/* ----- STORYBOOKS ----- */
.ed-storybooks { padding-bottom: 40px; }
.ed-sb-grid {
  max-width: 1200px; margin: 28px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.ed-sb {
  display: flex; flex-direction: column;
  border-radius: 16px; overflow: hidden;
  background: var(--card);
  box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 12px 30px -18px rgba(15,28,46,.2);
  transition: transform .25s cubic-bezier(.2,.7,.2,1), box-shadow .25s ease;
}
.ed-sb:hover { transform: translateY(-3px); box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 24px 46px -20px rgba(15,28,46,.32); }
.ed-sb-cover {
  position: relative; display: block;
  aspect-ratio: 4 / 3; overflow: hidden; background: var(--card-soft);
}
.ed-sb-cover img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform .5s cubic-bezier(.2,.7,.2,1);
}
.ed-sb:hover .ed-sb-cover img { transform: scale(1.04); }
.ed-sb-badge {
  position: absolute; left: 14px; bottom: 14px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .02em;
  color: #2a2018; background: rgba(255,255,255,.92);
  padding: 7px 12px; border-radius: 999px;
  box-shadow: 0 4px 14px rgba(0,0,0,.18);
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
}
.ed-sb-cover:hover .ed-sb-badge { transform: translateY(-2px); }
.ed-sb-body { padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 9px; flex: 1; }
.ed-sb-tag {
  font-family: var(--f-mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--fg-soft);
}
.ed-sb-name {
  margin: 0; font-family: var(--f-display); font-weight: 600;
  font-size: 26px; line-height: 1.05; letter-spacing: -0.01em; color: var(--fg);
}
.ed-sb-name em { font-style: italic; font-weight: 400; color: var(--accent); }
.ed-sb-desc { margin: 0; font-size: 14px; line-height: 1.55; color: var(--fg-mute); flex: 1; }
.ed-sb-cta { font-family: var(--f-mono); font-size: 12px; letter-spacing: .03em; color: var(--accent); text-decoration: none; margin-top: 4px; }
.ed-sb-cta:hover { text-decoration: underline; }

/* ----- ABOUT ----- */
.ed-about { padding-bottom: 40px; }
.ed-about-body {
  max-width: 1200px; margin: 32px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: 80px 1fr 1fr; gap: 24px;
}
.ed-about-lead {
  grid-column: 2;
  font-family: var(--f-display);
  font-size: clamp(22px, 2.4vw, 30px); line-height: 1.25;
  margin: 0; color: var(--fg);
  text-wrap: balance;
}
.ed-about-lead em { color: var(--accent); font-style: italic; }
.ed-about-body > p:not(.ed-about-lead) {
  grid-column: 3;
  font-size: 15px; line-height: 1.65;
  color: var(--fg-mute); margin: 0;
}
.ed-about-body > p:not(.ed-about-lead) + p:not(.ed-about-lead) { margin-top: 14px; }
.ed-values {
  grid-column: 2 / -1;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  list-style: none; padding: 28px 0 0; margin: 28px 0 0;
  border-top: 1px solid var(--rule);
  font-size: 14px; color: var(--fg-mute);
}
.ed-values li b {
  display: block; font-family: var(--f-display); font-weight: 600;
  font-size: 18px; color: var(--fg); margin-bottom: 4px;
}

/* ----- CONTACT ----- */
.ed-contact { padding-bottom: 80px; }
.ed-form {
  max-width: 1200px; margin: 32px auto 0;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px 24px;
}
.ed-field { display: flex; flex-direction: column; gap: 6px; }
.ed-field-full { grid-column: 1 / -1; }
.ed-field span {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--fg-soft);
}
.ed-field input, .ed-field select, .ed-field textarea {
  font: 400 15px/1.5 var(--f-body);
  color: var(--fg); background: transparent;
  border: 0; border-bottom: 1px solid var(--rule);
  padding: 10px 0; outline: none; resize: none;
  transition: border-color .2s;
}
.ed-field textarea { border: 1px solid var(--rule); padding: 14px 16px; border-radius: 10px; background: var(--card); }
.ed-field select { border-bottom: 1px solid var(--rule); appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--fg-mute) 50%), linear-gradient(135deg, var(--fg-mute) 50%, transparent 50%); background-position: right 8px center, right 4px center; background-size: 4px 4px, 4px 4px; background-repeat: no-repeat; padding-right: 24px; }
.ed-field input:focus, .ed-field textarea:focus, .ed-field select:focus { border-color: var(--accent); }
.ed-form-foot {
  grid-column: 1 / -1;
  display: flex; justify-content: space-between; align-items: center; gap: 24px;
  border-top: 1px solid var(--rule); padding-top: 22px;
}
.ed-form-note {
  font-family: var(--f-mono); font-size: 11px; color: var(--fg-soft);
  margin: 0; max-width: 40ch; line-height: 1.5;
}
.ed-btn-primary {
  appearance: none; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-on);
  font: 500 14px/1 var(--f-body);
  padding: 14px 22px; border-radius: 10px;
  transition: filter .2s, transform .15s;
}
.ed-btn-primary:hover { filter: brightness(.92); transform: translateY(-1px); }

/* ----- FOOTER ----- */
.ed-footer {
  max-width: 1200px; margin: 0 auto;
  padding: 28px 40px 40px;
  border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: auto 1fr auto; gap: 32px;
  align-items: center;
}
.ed-footer-l { display: inline-flex; align-items: center; gap: 10px; }
.ed-footer-links { display: inline-flex; gap: 28px; justify-content: center; flex-wrap: wrap; }
.ed-footer-links a { font-size: 14px; color: var(--fg-mute); text-decoration: none; }
.ed-footer-links a:hover { color: var(--fg); }
.ed-footer-r { font-family: var(--f-mono); font-size: 11px; color: var(--fg-soft); text-align: right; }


/* ====================================================== */
/* ============ VARIANT 2 : STUDIO (DEV) ================ */
/* ====================================================== */

.variant-studio {
  --bg: #0a0f1a;
  --fg: #e8eef5;
  --fg-mute: #8b95a8;
  --fg-soft: #5d6778;
  --rule: #1a2233;
  --card: #0f1626;
  --card-soft: #131c2e;
  --accent-on: #06120a;
  font-family: var(--f-body);
  background: var(--bg);
  color: var(--fg);
}
body.variant-studio-active { background: #0a0f1a; }

.st-hero {
  max-width: 1200px; margin: 0 auto;
  padding: 100px 40px 80px;
}
.st-prompt {
  display: flex; flex-direction: column; gap: 4px;
  font-family: var(--f-mono); font-size: 13px; line-height: 1.5;
  color: var(--fg-mute);
  margin-bottom: 40px;
}
.st-prompt-line { display: block; }
.st-prompt-out { color: var(--fg); padding-left: 14px; }
.st-glyph { color: var(--accent); margin-right: 8px; }
.st-hero-title {
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 112px);
  line-height: .95; letter-spacing: -0.04em;
  margin: 0 0 36px; color: var(--fg);
}
.st-tag { color: var(--accent); font-weight: 400; }
.st-accent { color: var(--accent); }
.st-muted { color: var(--fg-mute); }
.st-hero-foot {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--rule); padding-top: 22px;
  font-family: var(--f-mono); font-size: 12px;
  color: var(--fg-soft);
}
.st-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 12px; border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 14%, transparent);
  color: var(--accent); font-size: 12px;
}
.st-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

/* section heads */
.st-sec-head {
  max-width: 1200px; margin: 0 auto;
  padding: 60px 40px 24px;
  display: grid; grid-template-columns: auto auto 1fr auto; gap: 18px;
  align-items: center;
}
.st-sec-num { font-family: var(--f-mono); font-size: 12px; color: var(--accent); }
.st-sec-head h2 {
  margin: 0;
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: -0.01em;
  color: var(--fg);
}
.st-sec-line { height: 1px; background: var(--rule); }
.st-sec-meta { font-family: var(--f-mono); font-size: 11px; color: var(--fg-soft); }

/* portfolio */
.st-portfolio { padding-bottom: 40px; }
.st-grid {
  max-width: 1200px; margin: 0 auto;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--rule);
  border: 1px solid var(--rule); border-radius: 14px; overflow: hidden;
}
.st-app {
  background: var(--card);
  padding: 26px 28px;
  display: grid; grid-template-columns: 56px 1fr auto; gap: 20px;
  align-items: start;
  position: relative;
  transition: background .2s;
}
.st-app:hover { background: var(--card-soft); }
.st-app-icon {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: var(--app-color);
  display: grid; place-items: center;
  font-family: var(--f-mono); font-size: 22px; font-weight: 700;
  color: rgba(255,255,255,.95);
  box-shadow: 0 0 0 1px rgba(255,255,255,.05) inset;
}
.st-app-body { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.st-app-name {
  font-family: var(--f-mono); font-size: 18px; font-weight: 600;
  margin: 0; color: var(--fg);
  display: flex; align-items: center; gap: 10px;
}
.st-app-name::after {
  content: '.app'; font-weight: 400; font-size: 13px; color: var(--fg-soft);
}
.st-app-tag {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--app-color);
}
.st-app-desc { margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--fg-mute); }
.st-app-cta {
  align-self: start;
  font-family: var(--f-mono); font-size: 12px;
  color: var(--accent); text-decoration: none;
  padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--rule);
  white-space: nowrap;
  transition: background .2s, border-color .2s;
}
.st-app-cta:hover { background: color-mix(in oklab, var(--accent) 12%, transparent); border-color: var(--accent); }

/* books */
.st-books { padding-bottom: 40px; }
.st-books-list {
  max-width: 1200px; margin: 0 auto;
  padding: 0 40px;
  display: grid; gap: 1px; background: var(--rule);
  border: 1px solid var(--rule); border-radius: 14px; overflow: hidden;
}
.st-book {
  background: var(--card);
  padding: 22px 28px;
  display: grid; grid-template-columns: 60px 1fr 120px 90px; gap: 24px;
  align-items: center;
  font-family: var(--f-mono);
}
.st-book-num { color: var(--fg-soft); font-size: 12px; }
.st-book-name { color: var(--fg); font-size: 16px; font-weight: 500; }
.st-book-desc { font-family: var(--f-body); color: var(--fg-mute); font-size: 13px; line-height: 1.5; margin-top: 4px; }
.st-book-meta { color: var(--fg-soft); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.st-book-link { color: var(--accent); font-size: 12px; text-decoration: none; text-align: right; }

/* about */
.st-about { padding-bottom: 40px; }
.st-about-grid {
  max-width: 1200px; margin: 0 auto;
  padding: 0 40px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.st-about-card {
  background: var(--card);
  border: 1px solid var(--rule); border-radius: 14px;
  padding: 24px;
  display: flex; flex-direction: column; gap: 14px;
}
.st-card-lbl { font-family: var(--f-mono); font-size: 11px; color: var(--accent); }
.st-about-card p { margin: 0; font-size: 14px; line-height: 1.6; color: var(--fg); }
.st-stack, .st-process { margin: 0; padding: 0; list-style: none; font-family: var(--f-mono); font-size: 13px; color: var(--fg-mute); display: flex; flex-direction: column; gap: 6px; }
.st-process { counter-reset: step; padding-left: 0; }
.st-process li { counter-increment: step; padding-left: 24px; position: relative; }
.st-process li::before { content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 0; color: var(--accent); }
.st-stack li::before { content: '◆ '; color: var(--accent); margin-right: 6px; }

/* contact */
.st-contact { padding-bottom: 80px; }
.st-form {
  max-width: 1200px; margin: 0 auto;
  padding: 0 40px;
  display: flex; flex-direction: column; gap: 16px;
  font-family: var(--f-mono);
}
.st-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.st-form label { display: flex; flex-direction: column; gap: 6px; }
.st-form span { font-size: 12px; color: var(--accent); }
.st-form input, .st-form select, .st-form textarea {
  background: var(--card); border: 1px solid var(--rule); border-radius: 8px;
  padding: 12px 14px; color: var(--fg);
  font: 400 14px/1.5 var(--f-mono);
  outline: none; resize: vertical;
  transition: border-color .2s;
}
.st-form input:focus, .st-form textarea:focus, .st-form select:focus { border-color: var(--accent); }
.st-btn {
  align-self: flex-start;
  appearance: none; cursor: pointer;
  background: var(--accent); color: var(--accent-on);
  border: 0; padding: 14px 22px; border-radius: 8px;
  font: 600 13px/1 var(--f-mono);
  transition: filter .2s;
}
.st-btn:hover { filter: brightness(1.1); }

/* footer */
.st-footer {
  margin-top: 40px;
  border-top: 1px solid var(--rule);
}
.st-footer-grid {
  max-width: 1200px; margin: 0 auto;
  padding: 40px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr auto; gap: 40px;
  font-family: var(--f-mono); font-size: 13px;
}
.st-footer-grid > div { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.st-footer-grid p { margin: 0; color: var(--fg-mute); font-size: 12px; line-height: 1.6; }
.st-footer-grid a { color: var(--fg-mute); text-decoration: none; }
.st-footer-grid a:hover { color: var(--accent); }
.st-foot-lbl { color: var(--accent); font-size: 11px; }
.st-foot-copy { color: var(--fg-soft); font-size: 11px; align-items: flex-end !important; }


/* ====================================================== */
/* ============ VARIANT 3 : BRUTALIST =================== */
/* ====================================================== */

.variant-brutalist {
  --bg: #ededea;
  --fg: #0a0a0a;
  --fg-mute: #2a2a2a;
  --fg-soft: #6a6a6a;
  --rule: #0a0a0a;
  --card: #ffffff;
  font-family: var(--f-body);
}
.variant-brutalist .ed-section-head, .variant-brutalist .ed-grid { display: none; }

.br-marquee {
  border-top: 2px solid var(--rule);
  border-bottom: 2px solid var(--rule);
  background: var(--fg); color: var(--bg);
  overflow: hidden; white-space: nowrap;
  display: flex; gap: 40px;
  font: 700 13px/1 'Archivo', sans-serif;
  letter-spacing: .12em;
  padding: 12px 0;
}
.br-marquee span {
  display: inline-block;
  animation: br-scroll 40s linear infinite;
  flex-shrink: 0;
}
@keyframes br-scroll { from { transform: translateX(0); } to { transform: translateX(-100%); } }

.br-hero-body {
  max-width: 1400px; margin: 0 auto;
  padding: 60px 40px;
  display: grid; grid-template-columns: 1.6fr 1fr; gap: 60px;
  border-bottom: 2px solid var(--rule);
  align-items: end;
}
.br-hero-title { margin: 0; }
.br-hero-line {
  display: block;
  font-family: 'Archivo', sans-serif;
  font-weight: 900;
  font-size: clamp(56px, 11vw, 168px);
  line-height: .85;
  letter-spacing: -0.04em;
  color: var(--fg);
  text-transform: uppercase;
}
.br-l1 { color: var(--fg); }
.br-l2 { color: var(--accent); display: inline-flex; align-items: center; gap: 12px; }
.br-l3 { color: var(--fg); padding-left: 80px; }
.br-hero-dot {
  display: inline-block;
  width: clamp(40px, 7vw, 96px); height: clamp(40px, 7vw, 96px);
  border-radius: 50%;
  background: var(--fg);
  vertical-align: middle;
  margin: 0 8px;
}
.br-hero-side { padding-bottom: 16px; }
.br-hero-side p {
  font-size: 16px; line-height: 1.55; color: var(--fg-mute);
  margin: 0 0 24px; max-width: 32ch;
}
.br-cta {
  display: inline-block;
  font: 700 14px/1 'Archivo', sans-serif;
  letter-spacing: .05em;
  text-decoration: none;
  background: var(--fg); color: var(--bg);
  padding: 16px 22px;
  border: 2px solid var(--fg);
  transition: background .15s, color .15s;
}
.br-cta:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.br-hero-grid {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-bottom: 2px solid var(--rule);
}
.br-hero-grid > div {
  padding: 22px 30px;
  border-right: 2px solid var(--rule);
  display: flex; flex-direction: column; gap: 4px;
}
.br-hero-grid > div:last-child { border-right: 0; }
.br-hero-grid b {
  font-family: 'Archivo', sans-serif; font-weight: 900;
  font-size: 38px; line-height: 1; color: var(--fg);
}
.br-hero-grid span {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--fg-soft); text-transform: uppercase;
}

/* section heads */
.br-head {
  max-width: 1400px; margin: 0 auto;
  padding: 40px 40px 24px;
  display: grid; grid-template-columns: 100px 1fr auto;
  gap: 24px; align-items: end;
  border-bottom: 2px solid var(--rule);
}
.br-head-num {
  font-family: var(--f-mono); font-size: 12px;
  letter-spacing: .12em; color: var(--accent);
}
.br-head h2 {
  margin: 0;
  font-family: 'Archivo', sans-serif; font-weight: 900;
  font-size: clamp(36px, 5.5vw, 80px);
  line-height: .9; letter-spacing: -0.025em;
  text-transform: uppercase;
}
.br-head-meta {
  font-family: var(--f-mono); font-size: 11px;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--fg-soft);
}

/* portfolio brutalist */
.br-portfolio { padding-bottom: 0; }
.br-grid {
  max-width: 1400px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr);
}
.br-card {
  background: var(--card);
  border-right: 2px solid var(--rule);
  border-bottom: 2px solid var(--rule);
  padding: 0;
  display: flex; flex-direction: column;
  position: relative;
}
.br-card:nth-child(3n) { border-right: 0; }
.br-card-band {
  background: var(--app-color);
  height: 18px;
}
.br-card-head {
  padding: 24px 26px 16px;
  display: grid; grid-template-columns: 56px 1fr auto;
  gap: 16px; align-items: center;
  border-bottom: 2px solid var(--rule);
}
.br-card-icon {
  width: 56px; height: 56px;
  background: var(--app-color);
  border: 2px solid var(--rule);
  display: grid; place-items: center;
  font-family: 'Archivo', sans-serif; font-weight: 900;
  font-size: 24px; color: #fff;
}
.br-card-name { margin: 0; font-family: 'Archivo', sans-serif; font-weight: 900; font-size: 26px; line-height: 1; color: var(--fg); text-transform: uppercase; letter-spacing: -0.01em; }
.br-card-num { font-family: var(--f-mono); font-size: 11px; color: var(--fg-soft); }
.br-card-tag {
  padding: 10px 26px;
  font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--fg);
  background: var(--bg);
  border-bottom: 2px solid var(--rule);
}
.br-card-desc {
  padding: 18px 26px;
  font-size: 14px; line-height: 1.55; color: var(--fg-mute);
  margin: 0; flex: 1;
}
.br-card-cta {
  display: block;
  padding: 14px 26px;
  background: var(--fg); color: var(--bg);
  text-decoration: none;
  font: 700 13px/1 'Archivo', sans-serif;
  letter-spacing: .08em;
  text-transform: uppercase;
  transition: background .15s;
}
.br-card-cta:hover { background: var(--accent); }

/* books brutalist */
.br-books { padding-bottom: 0; }
.br-books-list {
  max-width: 1400px; margin: 0 auto;
  border-bottom: 2px solid var(--rule);
}
.br-book {
  display: grid; grid-template-columns: 100px 1fr 2fr auto;
  gap: 24px; align-items: center;
  padding: 24px 40px;
  border-bottom: 2px solid var(--rule);
  background: var(--card);
}
.br-book:last-child { border-bottom: 0; }
.br-book-num { font-family: var(--f-mono); color: var(--fg-soft); font-size: 13px; }
.br-book-name { font-family: 'Archivo', sans-serif; font-weight: 900; font-size: 22px; text-transform: uppercase; color: var(--fg); }
.br-book-desc { font-size: 14px; color: var(--fg-mute); line-height: 1.55; }
.br-book-link { font: 700 12px/1 'Archivo', sans-serif; letter-spacing: .08em; color: var(--accent); text-decoration: none; text-transform: uppercase; }

/* about brutalist */
.br-about { padding-bottom: 0; }
.br-about-grid {
  max-width: 1400px; margin: 0 auto;
  padding: 50px 40px;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 60px;
  border-bottom: 2px solid var(--rule);
}
.br-about-big {
  font-family: 'Archivo', sans-serif; font-weight: 900;
  font-size: clamp(28px, 3.6vw, 56px);
  line-height: 1; letter-spacing: -0.02em;
  margin: 0; text-transform: uppercase; color: var(--fg);
}
.br-about-mark {
  background: var(--accent); color: #fff;
  padding: 0 8px;
}
.br-about-cols { display: flex; flex-direction: column; gap: 22px; }
.br-about-cols > div { border-top: 2px solid var(--rule); padding-top: 14px; }
.br-about-lbl { font-family: var(--f-mono); font-size: 11px; letter-spacing: .12em; color: var(--accent); }
.br-about-cols p { margin: 6px 0 0; font-size: 14px; line-height: 1.55; color: var(--fg-mute); }
.br-about-cols em { color: var(--fg); font-style: normal; font-weight: 700; }

/* contact brutalist */
.br-contact { padding-bottom: 0; }
.br-form {
  max-width: 1400px; margin: 0 auto;
  padding: 40px;
  display: flex; flex-direction: column; gap: 18px;
  border-bottom: 2px solid var(--rule);
}
.br-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.br-field { display: flex; flex-direction: column; gap: 6px; }
.br-field span { font: 700 12px/1 'Archivo', sans-serif; letter-spacing: .12em; }
.br-field input, .br-field select, .br-field textarea {
  background: var(--card);
  border: 2px solid var(--rule);
  padding: 14px 16px;
  font: 400 15px/1.5 var(--f-body);
  color: var(--fg); outline: none; resize: vertical;
}
.br-field input:focus, .br-field textarea:focus, .br-field select:focus {
  border-color: var(--accent);
}
.br-btn {
  align-self: flex-start;
  appearance: none; cursor: pointer;
  background: var(--fg); color: var(--bg);
  border: 2px solid var(--rule);
  padding: 18px 28px;
  font: 900 14px/1 'Archivo', sans-serif;
  letter-spacing: .08em;
  transition: background .15s;
}
.br-btn:hover { background: var(--accent); border-color: var(--accent); }

/* footer brutalist */
.br-footer { background: var(--fg); color: var(--bg); }
.br-footer-top {
  max-width: 1400px; margin: 0 auto;
  padding: 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 40px;
  flex-wrap: wrap;
}
.br-foot-brand { display: inline-flex; align-items: center; gap: 12px; }
.br-foot-brand .brand-text { color: var(--bg); font-size: 18px; }
.br-foot-brand .brand-text i { color: var(--accent); }
.br-foot-links { display: flex; gap: 32px; flex-wrap: wrap; }
.br-foot-links a {
  color: var(--bg); text-decoration: none;
  font: 700 12px/1 'Archivo', sans-serif; letter-spacing: .12em;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}
.br-foot-links a:hover { border-color: var(--accent); color: var(--accent); }
.br-footer-marquee {
  border-top: 2px solid #fff;
  overflow: hidden; white-space: nowrap;
  padding: 14px 0;
  font: 700 13px/1 'Archivo', sans-serif;
  letter-spacing: .12em;
}
.br-footer-marquee span {
  display: inline-block;
  animation: br-scroll 30s linear infinite;
}


/* ====================================================== */
/* ============ TWEAKS PANEL ============================ */
/* ====================================================== */
.tk-panel {
  position: fixed; right: 16px; bottom: 16px; z-index: 9999;
  width: 280px;
  background: rgba(255,255,255,.92);
  color: #1a1a1a;
  border: 1px solid rgba(0,0,0,.08);
  border-radius: 14px;
  box-shadow: 0 12px 40px rgba(0,0,0,.18);
  font: 12px/1.4 'IBM Plex Sans', sans-serif;
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  overflow: hidden;
}
.tk-hd { display: flex; justify-content: space-between; align-items: center; padding: 12px 14px; border-bottom: 1px solid rgba(0,0,0,.06); }
.tk-hd b { font-size: 12.5px; font-weight: 600; }
.tk-x { appearance: none; border: 0; background: transparent; color: rgba(0,0,0,.5); width: 22px; height: 22px; border-radius: 6px; cursor: pointer; font-size: 12px; }
.tk-x:hover { background: rgba(0,0,0,.06); color: #000; }
.tk-body { padding: 12px 14px; display: flex; flex-direction: column; gap: 12px; }
.tk-sect { font-size: 10px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: rgba(0,0,0,.5); }
.tk-row { display: flex; align-items: center; }
.tk-row-h { justify-content: space-between; }
.tk-seg { display: inline-flex; gap: 2px; padding: 3px; background: rgba(0,0,0,.06); border-radius: 8px; }
.tk-seg button {
  appearance: none; border: 0; background: transparent;
  font: 500 11.5px/1 'IBM Plex Sans', sans-serif;
  color: rgba(0,0,0,.6);
  padding: 7px 10px; border-radius: 6px; cursor: pointer; flex: 1;
}
.tk-seg button:hover { color: #000; }
.tk-seg button.active { background: #fff; color: #000; box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.tk-seg-stack { display: grid; grid-template-columns: repeat(3, 1fr); }
.tk-toggle {
  display: inline-block;
  width: 36px; height: 20px; border-radius: 999px;
  background: rgba(0,0,0,.15);
  position: relative; cursor: pointer;
  transition: background .2s;
}
.tk-toggle.on { background: var(--accent, #1f8a5b); }
.tk-toggle-knob {
  position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; transition: transform .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.tk-toggle.on .tk-toggle-knob { transform: translateX(16px); }
.tk-swatches { display: flex; gap: 8px; }
.tk-swatches button {
  appearance: none; border: 0;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--c);
  cursor: pointer;
  position: relative;
  box-shadow: 0 0 0 2px transparent;
  transition: box-shadow .15s;
}
.tk-swatches button.active { box-shadow: 0 0 0 2px var(--c); outline: 2px solid #fff; outline-offset: -4px; }


/* ====================================================== */
/* ============ DARK MODE OVERRIDES ===================== */
/* ====================================================== */

/* editorial dark */
body.dark .variant-editorial {
  --bg: #11141a;
  --fg: #ecedef;
  --fg-mute: #9aa1ad;
  --fg-soft: #6b7281;
  --rule: #232831;
  --card: #181c24;
  --card-soft: #1f242d;
}
body.dark .topnav { background: color-mix(in oklab, #11141a 80%, transparent); border-bottom-color: rgba(255,255,255,.08); }
body.dark .ed-card { box-shadow: 0 1px 0 rgba(255,255,255,.04), 0 12px 30px -18px rgba(0,0,0,.5); }
body.dark .ed-card-icon { background: #fff; }
body.dark .ed-course, body.dark .ed-sb { box-shadow: 0 1px 0 rgba(255,255,255,.04), 0 12px 30px -18px rgba(0,0,0,.55); }
body.dark .ed-course:hover, body.dark .ed-sb:hover { box-shadow: 0 1px 0 rgba(255,255,255,.04), 0 24px 46px -20px rgba(0,0,0,.7); }

/* studio inverts to LIGHT in light "mode" — the studio variant is dark by default; we offer a light alt */
body:not(.dark) .variant-studio {
  --bg: #ffffff;
  --fg: #0a0f1a;
  --fg-mute: #4a5365;
  --fg-soft: #8b94a3;
  --rule: #e6e9ef;
  --card: #f9fafb;
  --card-soft: #f3f5f8;
  --accent-on: #ffffff;
}
body:not(.dark) .variant-studio { background: #ffffff; }

/* brutalist dark */
body.dark .variant-brutalist {
  --bg: #0a0a0a;
  --fg: #f5f5f3;
  --fg-mute: #c8c8c6;
  --fg-soft: #888;
  --rule: #f5f5f3;
  --card: #161616;
}
body.dark .variant-brutalist .br-marquee { background: var(--fg); color: var(--bg); }
body.dark .variant-brutalist .br-cta { background: var(--fg); color: var(--bg); border-color: var(--fg); }
body.dark .variant-brutalist .br-cta:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
body.dark .variant-brutalist .br-card-cta { background: var(--fg); color: var(--bg); }
body.dark .variant-brutalist .br-btn { background: var(--fg); color: var(--bg); }
body.dark .variant-brutalist .br-footer { background: #161616; }

/* ─── Lightbox ─────────────────────────────────────────────── */
#book-lightbox {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,.85);
  align-items: center; justify-content: center;
}
#book-lightbox.open { display: flex; }
#book-lightbox img {
  max-width: min(90vw, 500px); max-height: 90vh;
  border-radius: 4px; box-shadow: 0 8px 40px rgba(0,0,0,.6);
}

/* Make body bg track active variant */
body.var-editorial { background: var(--bg); }
body.var-studio    { background: #0a0f1a; }
body.var-studio:not(.dark) { background: #ffffff; }
body.var-brutalist { background: #ededea; }
body.var-brutalist.dark { background: #0a0a0a; }
body.dark.var-editorial { background: #11141a; }


/* ====================================================== */
/* ============ RESPONSIVE ============================== */
/* ====================================================== */
@media (max-width: 920px) {
  .ed-grid, .ed-books-grid, .ed-courses-grid, .ed-sb-grid, .br-grid { grid-template-columns: repeat(2, 1fr); }
  .ed-hero { grid-template-columns: 1fr; padding: 48px 24px; }
  .ed-hero-rail { padding-top: 0; }
  .ed-hero-meta { grid-column: 1; grid-template-columns: 1fr; gap: 28px; }
  .ed-section-head, .ed-form, .ed-about-body, .ed-footer, .ed-section-lead { padding-left: 24px; padding-right: 24px; }
  .ed-grid, .ed-books-grid, .ed-courses-grid, .ed-sb-grid { padding-left: 24px; padding-right: 24px; }
  .ed-section-head { grid-template-columns: 1fr; gap: 8px; }
  .ed-about-body { grid-template-columns: 1fr; }
  .ed-about-lead, .ed-about-body > p { grid-column: 1; }
  .ed-values { grid-column: 1; grid-template-columns: 1fr; }
  .ed-form { grid-template-columns: 1fr; }
  .ed-footer { grid-template-columns: 1fr; text-align: center; gap: 16px; }
  .st-grid, .st-about-grid { grid-template-columns: 1fr; }
  .st-hero { padding: 60px 24px 50px; }
  .st-form-row, .st-footer-grid { grid-template-columns: 1fr; }
  .st-book { grid-template-columns: 1fr; gap: 8px; }
  .st-app { grid-template-columns: 56px 1fr; }
  .st-app-cta { grid-column: 1 / -1; align-self: stretch; text-align: center; }
  .br-hero-body { grid-template-columns: 1fr; padding: 40px 24px; }
  .br-l3 { padding-left: 0; }
  .br-grid { grid-template-columns: 1fr; }
  .br-card, .br-card:nth-child(3n) { border-right: 0; }
  .br-hero-grid { grid-template-columns: repeat(2, 1fr); }
  .br-hero-grid > div:nth-child(2) { border-right: 0; }
  .br-about-grid { grid-template-columns: 1fr; gap: 30px; padding: 30px 24px; }
  .br-form { padding: 30px 24px; }
  .br-form-row { grid-template-columns: 1fr; }
  .br-book { grid-template-columns: 60px 1fr; padding: 22px 24px; }
  .br-book-desc, .br-book-link { grid-column: 1 / -1; }
  .topnav { padding: 12px 16px; flex-wrap: wrap; gap: 12px; }
  .nav-cta { display: none; }
}
@media (max-width: 580px) {
  .ed-grid, .ed-books-grid, .ed-courses-grid, .ed-sb-grid { grid-template-columns: 1fr; }
  .tk-panel { width: calc(100vw - 32px); }
}