/* ==========================================================================
   Maktub Solutions AI — Design tokens
   ========================================================================== */
:root {
  --bg: #050c0a;
  --bg-alt: #08150f;
  --surface: #0b1b15;
  --surface-hover: #0f231b;
  --border: rgba(163, 224, 196, 0.09);
  --border-strong: rgba(163, 224, 196, 0.22);

  --text: #f1faf5;
  --text-muted: #a6c3b7;
  --text-faint: #5c7a6d;

  --accent-deep: #047857;
  --accent-bright: #34d399;
  --signal: #5eead4;
  --gradient-brand: linear-gradient(135deg, #047857 0%, #10b981 50%, #34d399 100%);

  --font-heading: "Bricolage Grotesque", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(16, 185, 129, 0.28);

  --container-w: 1160px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { max-width: 100%; overflow-x: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.015em;
}
p { margin: 0 0 1em; color: var(--text-muted); }
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-deep);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 999;
}
.skip-link:focus { left: 16px; top: 16px; }

::selection { background: var(--accent-deep); color: #fff; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out), border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(115deg, #047857, #10b981 45%, #34d399 55%, #10b981 100%);
  background-size: 220% 100%;
  color: #04140f;
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.32);
  animation: btn-flow 7s ease-in-out infinite;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(16, 185, 129, 0.45); }
@keyframes btn-flow {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--signal); color: var(--signal); }
.btn-sm { padding: 10px 20px; font-size: 0.85rem; }

@media (prefers-reduced-motion: reduce) {
  .btn-primary { animation: none; }
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(5, 12, 10, 0.6);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(5, 12, 10, 0.88);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 76px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  margin-right: auto;
}
.logo-text .logo-accent {
  color: var(--accent-bright);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav a {
  font-size: 0.88rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.main-nav a:hover { color: var(--text); }
.nav-cta { flex-shrink: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 18px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  padding: 200px 0 120px;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -320px;
  left: 55%;
  width: 1000px;
  height: 800px;
  background: radial-gradient(closest-side, rgba(16, 185, 129, 0.24), rgba(52, 211, 153, 0.08) 45%, transparent 72%);
  filter: blur(10px);
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 720px) 1fr;
  align-items: center;
  gap: 24px;
}
.hero-copy { max-width: 720px; min-width: 0; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 500;
  font-family: var(--font-mono);
  color: var(--signal);
  margin-bottom: 22px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(94, 234, 212, 0.18);
  animation: blip-pulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}
.hero h1 {
  font-size: clamp(2.3rem, 4.4vw, 3.7rem);
  color: var(--text);
  margin-bottom: 26px;
}
.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 1.1rem;
  max-width: 620px;
  margin-bottom: 38px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}
.tech-strip-wrap {
  padding-top: 28px;
  border-top: 1px solid var(--border);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.tech-strip {
  display: flex;
  width: max-content;
  gap: 14px;
  font-family: var(--font-mono);
  animation: tech-strip-scroll 26s linear infinite;
}
.tech-strip:hover { animation-play-state: paused; }
.tech-strip li {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.tech-strip li::before { content: "◆ "; color: var(--signal); font-size: 0.6rem; }

@keyframes tech-strip-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* --- Signal ring: hero signature element ------------------------------- */
.signal-ring {
  position: relative;
  justify-self: end;
  width: min(420px, 100%);
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.signal-ring__sweep {
  position: absolute;
  inset: 6%;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0deg, transparent 260deg, rgba(94, 234, 212, 0.5) 336deg, var(--signal) 360deg);
  animation: signal-spin 34s linear infinite;
  -webkit-mask: radial-gradient(closest-side, transparent calc(100% - 1.5px), #000 calc(100% - 1.5px));
  mask: radial-gradient(closest-side, transparent calc(100% - 1.5px), #000 calc(100% - 1.5px));
}
.signal-ring__ring {
  position: absolute;
  border: 1px solid var(--border);
  border-radius: 50%;
}
.signal-ring__ring--outer { inset: 0; }
.signal-ring__ring--mid { inset: 18%; border-color: var(--border-strong); }
.signal-ring__ring--inner { inset: 38%; }
.signal-ring__core {
  position: absolute;
  inset: 44%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(52, 211, 153, 0.5), rgba(4, 120, 87, 0.18) 65%, transparent 75%);
}
.signal-ring__trace {
  position: absolute;
  inset: 30%;
  width: 40%;
  height: 40%;
  overflow: visible;
}
.signal-ring__trace path {
  fill: none;
  stroke: var(--text);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 64;
  stroke-dashoffset: 64;
  animation: trace-draw 4.5s var(--ease-out) infinite;
}
.signal-ring__blip {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  margin: -3px;
  border-radius: 50%;
  background: var(--signal);
  transform: rotate(var(--angle)) translate(var(--dist)) rotate(calc(-1 * var(--angle)));
  animation: blip-pulse 3s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes signal-spin { to { transform: rotate(360deg); } }
@keyframes trace-draw {
  0% { stroke-dashoffset: 64; opacity: 0; }
  8% { opacity: 1; }
  55% { stroke-dashoffset: 0; opacity: 1; }
  75% { stroke-dashoffset: 0; opacity: 1; }
  100% { stroke-dashoffset: -64; opacity: 0; }
}
@keyframes blip-pulse {
  0%, 100% { opacity: 0.35; transform: rotate(var(--angle)) translate(var(--dist)) rotate(calc(-1 * var(--angle))) scale(0.85); }
  50% { opacity: 1; transform: rotate(var(--angle)) translate(var(--dist)) rotate(calc(-1 * var(--angle))) scale(1.3); }
}

@media (prefers-reduced-motion: reduce) {
  .tech-strip { animation: none; }
  .signal-ring__sweep { animation: none; }
  .signal-ring__trace path { animation: none; stroke-dashoffset: 0; opacity: 1; }
  .signal-ring__blip { animation: none; opacity: 0.8; }
  .eyebrow::before { animation: none; }
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr); }
  .signal-ring { display: none; }
}

/* ==========================================================================
   Sections (shared)
   ========================================================================== */
.section { padding: 116px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); color: var(--text); }
.section-sub { font-size: 1.05rem; }
h2 { color: var(--text); }

/* ==========================================================================
   About
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.about-grid h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.mini-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: border-color 0.3s ease, transform 0.3s var(--ease-out);
}
.mini-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.mini-icon { font-size: 1.4rem; display: block; margin-bottom: 12px; }
.mini-card h3 { font-size: 0.98rem; color: var(--text); margin-bottom: 6px; }
.mini-card p { font-size: 0.86rem; margin-bottom: 0; }

/* ==========================================================================
   Cards grid (Soluções) — module cards with a gradient-sweep hover border
   ========================================================================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.35s var(--ease-out), background 0.3s ease;
  isolation: isolate;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--border-strong), var(--border) 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  z-index: -1;
  transition: background 0.4s ease;
}
.card:hover {
  transform: translateY(-4px);
  background: var(--surface-hover);
}
.card:hover::before {
  background: conic-gradient(from 180deg, var(--accent-deep), var(--signal), var(--accent-bright), var(--accent-deep));
}
.card-icon {
  font-size: 1.7rem;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  margin-bottom: 22px;
}
.card h3 { font-size: 1.06rem; color: var(--text); margin-bottom: 10px; }
.card p { font-size: 0.92rem; margin-bottom: 0; }

/* ==========================================================================
   Portfólio (cases)
   ========================================================================== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.case-card {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  isolation: isolate;
  transition: transform 0.35s var(--ease-out), background 0.3s ease;
}
.case-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--border-strong), var(--border) 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  z-index: -1;
}
.case-card:hover {
  transform: translateY(-4px);
  background: var(--surface-hover);
}
.case-card h3 {
  font-size: 1.15rem;
  color: var(--text);
  margin: 6px 0 18px;
}
.case-block { margin-bottom: 14px; }
.case-block:last-of-type { margin-bottom: 0; }
.case-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.case-block p { font-size: 0.9rem; margin: 0; }
.case-result .case-label { color: var(--signal); }
.case-stack {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-faint);
}
@media (max-width: 860px) {
  .case-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Stack
   ========================================================================== */
.stack-groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.stack-group h3 {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 16px;
  font-weight: 500;
}
.pills { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  padding: 9px 18px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--border-strong);
  font-size: 0.83rem;
  font-family: var(--font-mono);
  color: var(--text);
  font-weight: 400;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.pill:hover { border-color: var(--signal); color: var(--signal); }

/* ==========================================================================
   Founder
   ========================================================================== */
.founder-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 56px;
  align-items: center;
}
.founder-avatar {
  position: relative;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: var(--gradient-brand);
  box-shadow: var(--shadow-glow);
  justify-self: center;
  overflow: hidden;
}
.founder-avatar::after {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 50%;
  border: 1px dashed var(--border-strong);
  animation: signal-spin 60s linear infinite;
}
.founder-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.founder-text h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); margin-bottom: 6px; }
.founder-role {
  color: var(--signal);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.88rem;
  margin-bottom: 22px;
}

@media (prefers-reduced-motion: reduce) {
  .founder-avatar::after { animation: none; }
}

/* ==========================================================================
   CTA final
   ========================================================================== */
.cta-final {
  position: relative;
  padding: 108px 0;
  text-align: center;
  background: radial-gradient(ellipse at center, rgba(16, 185, 129, 0.12), transparent 70%), var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cta-final::before {
  content: "";
  display: block;
  width: 64px;
  height: 1px;
  margin: 0 auto 32px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
}
.cta-final h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); margin-bottom: 14px; }
.cta-final p { font-size: 1.05rem; margin-bottom: 32px; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 28px;
}
.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.94rem;
  transition: border-color 0.2s ease, transform 0.25s var(--ease-out);
}
.contact-link:hover { border-color: var(--signal); transform: translateX(4px); }
.contact-icon { font-size: 1.05rem; }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-form label {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-faint);
  font-weight: 500;
  margin-top: 14px;
}
.contact-form input,
.contact-form textarea {
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(94, 234, 212, 0.12);
}
.contact-form .btn { margin-top: 20px; align-self: flex-start; }
.consent-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 400;
  cursor: pointer;
}
.consent-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--signal);
  background: none;
  border: none;
  padding: 0;
}
.consent-check a { color: var(--signal); text-decoration: underline; }
.form-note {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--signal);
  min-height: 1.2em;
  margin: 10px 0 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 28px;
  background: var(--bg-alt);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}
.footer-nav { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-nav a { font-size: 0.84rem; font-family: var(--font-mono); color: var(--text-muted); }
.footer-nav a:hover { color: var(--text); }
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  transition: border-color 0.2s ease;
}
.footer-socials a:hover { border-color: var(--signal); }
.footer-copy {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
  text-align: center;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.footer-copy a { color: var(--text-muted); text-decoration: underline; text-underline-offset: 2px; }
.footer-copy a:hover { color: var(--signal); }

.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.2s ease;
  z-index: 90;
}
.back-to-top:hover { border-color: var(--signal); }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ==========================================================================
   Focus visibility (accessibility floor)
   ========================================================================== */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .about-grid,
  .founder-grid,
  .contact-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .founder-avatar { width: 160px; height: 160px; }
  .cards-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stack-groups { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 760px) {
  .main-nav, .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: rgba(5, 12, 10, 0.98);
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border);
  }

  .hero { padding: 150px 0 80px; }
  .section { padding: 76px 0; }
  .cards-grid { grid-template-columns: minmax(0, 1fr); }
  .about-cards { grid-template-columns: minmax(0, 1fr); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}