/* GPT Desk — Layout: nav, footer, grid, containers, responsive */

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-6);
}

/* ── Section wrapper ── */
.section {
  padding: var(--sp-20) 0;
}

.section--alt {
  background: var(--c-bg);
}

.section--indigo {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-secondary) 100%);
  color: #fff;
}

/* ── Section header ── */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-primary);
  background: var(--c-primary-s);
  border: 1px solid var(--c-border);
  border-radius: var(--r-full);
  padding: var(--sp-1) var(--sp-3);
  margin-bottom: var(--sp-4);
}

.section--indigo .section-tag {
  color: #fff;
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.25);
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--c-text);
  margin-bottom: var(--sp-4);
}

.section-desc {
  font-size: var(--text-md);
  color: var(--c-text-2);
  max-width: 560px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: var(--sp-12);
}

.section-header--center {
  text-align: center;
}

.section-header--center .section-desc {
  margin: 0 auto;
}

/* ── Grid ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-8); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); }

/* ── Flex utils ── */
.flex         { display: flex; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-2  { gap: var(--sp-2); }
.gap-4  { gap: var(--sp-4); }
.gap-6  { gap: var(--sp-6); }

/* ─────────────────────────────────────────────
   NAV
───────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.2s ease;
}

.nav.scrolled {
  box-shadow: 0 2px 20px rgba(89,86,233,0.08);
}

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

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav__logo-icon svg {
  display: block;
}

/* Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav__link {
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--c-text-2);
  border-radius: var(--r-sm);
  transition: color 0.15s, background 0.15s;
}

.nav__link:hover,
.nav__link.active {
  color: var(--c-primary);
  background: var(--c-primary-s);
}

/* CTA */
.nav__cta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

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

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--c-border);
  padding: var(--sp-4) var(--sp-6) var(--sp-6);
  flex-direction: column;
  gap: var(--sp-2);
  box-shadow: 0 8px 24px rgba(89,86,233,0.10);
  z-index: 99;
}

.nav__mobile.open { display: flex; }

.nav__mobile .nav__link {
  font-size: var(--text-base);
  padding: var(--sp-3) var(--sp-4);
}

.nav__mobile .btn {
  margin-top: var(--sp-2);
  text-align: center;
}

/* ─────────────────────────────────────────────
   BUTTONS
───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 10px 22px;
  border-radius: var(--r-sm);
  font-size: var(--text-sm);
  font-weight: 700;
  border: none;
  transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 0.01em;
}

.btn:active { transform: scale(0.97); }

.btn--primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 2px 12px rgba(89,86,233,0.30);
}

.btn--primary:hover {
  background: var(--c-primary-h);
  box-shadow: 0 4px 20px rgba(89,86,233,0.40);
}

.btn--white {
  background: #fff;
  color: var(--c-primary);
  box-shadow: 0 2px 12px rgba(0,0,0,0.10);
}

.btn--white:hover {
  background: var(--c-bg-alt);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.btn--ghost {
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: 1.5px solid rgba(255,255,255,0.35);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}

.btn--outline {
  background: transparent;
  color: var(--c-primary);
  border: 1.5px solid var(--c-border);
}

.btn--outline:hover {
  background: var(--c-primary-s);
  border-color: var(--c-primary);
}

.btn--lg {
  padding: 14px 32px;
  font-size: var(--text-base);
  border-radius: var(--r-md);
}

.btn--sm {
  padding: 7px 16px;
  font-size: var(--text-xs);
  border-radius: var(--r-sm);
}

/* ─────────────────────────────────────────────
   FOOTER
───────────────────────────────────────────── */
.footer {
  background: var(--c-text);
  color: rgba(255,255,255,0.55);
  padding: var(--sp-16) 0 var(--sp-8);
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--sp-8);
  padding-bottom: var(--sp-10);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: var(--sp-8);
}

.footer__brand .nav__logo {
  color: #fff;
  margin-bottom: var(--sp-4);
}

.footer__brand .nav__logo-icon {
  background: rgba(89,86,233,0.6);
}

.footer__tagline {
  font-size: var(--text-sm);
  line-height: 1.7;
  max-width: 240px;
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.35);
  margin-bottom: var(--sp-4);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.55);
  transition: color 0.15s;
}

.footer__link:hover { color: #fff; }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
}

/* ─────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer__top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: var(--sp-16) 0; }
  .section-title { font-size: var(--text-xl); }
  .grid-2,
  .grid-3 { grid-template-columns: 1fr; }

  .nav__links,
  .nav__cta .btn--outline { display: none; }
  .nav__hamburger { display: flex; }

  .footer__top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--sp-4); }
  .section-title { font-size: var(--text-lg); }
  .footer__top { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: var(--sp-3); text-align: center; }
}