/* ============================================================
   Sylntra website — shared global rules.
   Built strictly on the Sylntra design tokens (var(--*)).
   ============================================================ */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; overflow-x: clip; }

body {
  margin: 0;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-display);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--color-accent-periwinkle); color: var(--color-ink); }

/* --- Layout primitives ------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--gutter-desktop);
  padding-right: var(--gutter-desktop);
}
.band { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.band-tight { padding-top: var(--space-5xl); padding-bottom: var(--space-5xl); }
.surface-dark { background: var(--color-canvas-dark); color: var(--color-on-dark); }
.surface-light { background: var(--color-canvas); color: var(--color-ink); }

/* --- Type helpers (sentence-case display sans) ------------- */
.display-hero {
  font-family: var(--font-display); font-weight: var(--weight-medium);
  font-size: clamp(40px, 6.2vw, 84px); line-height: 1.02;
  letter-spacing: -0.03em; margin: 0;
}
.display-xxl { font-family: var(--font-display); font-weight: var(--weight-medium);
  font-size: clamp(34px, 4.4vw, 64px); line-height: 1.05; letter-spacing: -0.03em; margin: 0; }
.display-xl { font-family: var(--font-display); font-weight: var(--weight-medium);
  font-size: clamp(28px, 3vw, 40px); line-height: 1.1; letter-spacing: -0.02em; margin: 0; }
.display-lg { font-family: var(--font-display); font-weight: var(--weight-medium);
  font-size: var(--display-lg-size); line-height: var(--display-lg-line); letter-spacing: var(--display-lg-track); margin: 0; }
.display-md { font-family: var(--font-display); font-weight: var(--weight-medium);
  font-size: var(--display-md-size); line-height: var(--display-md-line); letter-spacing: var(--display-md-track); margin: 0; }
.lead { font-family: var(--font-display); font-weight: var(--weight-regular);
  font-size: clamp(17px, 1.45vw, 20px); line-height: 1.5; letter-spacing: -0.01em; color: var(--color-body); margin: 0; }
.lead.on-dark { color: #c9c9d6; }
.body { font-family: var(--font-display); font-size: var(--body-md-size); line-height: 1.55; letter-spacing: var(--body-md-track); color: var(--color-body); margin: 0; }
.mono-eyebrow {
  font-family: var(--font-mono); font-weight: var(--weight-medium);
  font-size: var(--mono-eyebrow-size); line-height: var(--mono-eyebrow-line);
  letter-spacing: 1.4px; text-transform: uppercase; color: var(--color-body); margin: 0;
}
.mono-eyebrow.on-dark { color: #9a9ab0; }
.gradient-text {
  background: var(--gradient-brand); -webkit-background-clip: text;
  background-clip: text; color: transparent;
}

/* --- Grids --------------------------------------------------- */
.grid { display: grid; gap: var(--space-3xl); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* --- Header -------------------------------------------------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
  border-bottom: 1px solid transparent;
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-2xl);
  height: 72px;
}
.site-header.is-solid { background: var(--color-canvas); border-bottom: var(--border-hairline); }
.site-header.is-top { background: transparent; }
.brand-lockup { display: flex; align-items: center; gap: var(--space-sm); text-decoration: none; }
.brand-mark { width: 26px; height: 26px; border-radius: var(--radius-sm); background: var(--gradient-brand); display: inline-block; }
.brand-word { font-family: var(--font-display); font-weight: var(--weight-medium); font-size: 21px; letter-spacing: -0.6px; }
.nav-links { display: flex; align-items: center; gap: var(--space-3xl); }
.nav-link {
  position: relative; font-family: var(--font-display); font-size: var(--body-md-size);
  letter-spacing: -0.01em; text-decoration: none; padding: 4px 0;
  transition: opacity 140ms ease;
}
.nav-link::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 1.5px;
  background: var(--gradient-brand); transition: right 220ms ease;
}
.nav-link:hover::after, .nav-link.is-active::after { right: 0; }
.nav-actions { display: flex; align-items: center; gap: var(--space-lg); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 44px; height: 44px; align-items: center; justify-content: center; }
.nav-toggle span { display: block; width: 22px; height: 1.5px; position: relative; }
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; width: 22px; height: 1.5px; }
.nav-toggle span::before { top: -6px; } .nav-toggle span::after { top: 6px; }

/* mobile drawer */
.mobile-drawer {
  position: fixed; inset: 0; z-index: 99; background: var(--color-canvas-dark);
  color: var(--color-on-dark); display: flex; flex-direction: column;
  padding: 96px var(--gutter-desktop) var(--space-5xl);
  transform: translateY(-100%); transition: transform 320ms cubic-bezier(.4,0,.1,1);
  pointer-events: none;
}
.mobile-drawer.is-open { transform: translateY(0); pointer-events: auto; }
.mobile-drawer a { color: var(--color-on-dark); text-decoration: none; font-family: var(--font-display);
  font-size: 34px; letter-spacing: -0.02em; padding: var(--space-md) 0; border-bottom: 1px solid var(--color-divider-dark); }

/* --- Footer -------------------------------------------------- */
.site-footer { background: var(--color-canvas-dark); color: var(--color-on-dark); }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: var(--space-3xl); }
.footer-col { display: flex; flex-direction: column; gap: var(--space-md); }
.footer-col h4 { font-family: var(--font-mono); font-weight: var(--weight-medium); font-size: var(--mono-eyebrow-size);
  letter-spacing: 1.4px; text-transform: uppercase; color: #9a9ab0; margin: 0 0 var(--space-sm); }
.footer-col a { font-family: var(--font-display); font-size: var(--body-md-size); letter-spacing: -0.01em;
  text-decoration: none; color: #d3d3df; transition: color 140ms ease; }
.footer-col a:hover { color: var(--color-on-dark); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2xl);
  border-top: 1px solid var(--color-divider-dark); padding-top: var(--space-2xl); margin-top: var(--space-5xl); flex-wrap: wrap; }
.social-row { display: flex; gap: var(--space-sm); }
.social-btn { width: 40px; height: 40px; border-radius: var(--radius-sm); border: 1px solid var(--color-divider-dark);
  display: inline-flex; align-items: center; justify-content: center; color: #d3d3df; transition: background-color 160ms ease, color 160ms ease; }
.social-btn:hover { background: var(--color-surface-dark-soft); color: #fff; }

/* --- Cards & hover ------------------------------------------ */
.lift { transition: transform 200ms ease, border-color 200ms ease; }
.lift:hover { transform: translateY(-4px); }

/* --- Reveal animations -------------------------------------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 700ms cubic-bezier(.2,.6,.2,1), transform 700ms cubic-bezier(.2,.6,.2,1); will-change: opacity, transform; }
.reveal.is-in { opacity: 1; transform: none; }
.reveal-scale { opacity: 0; transform: scale(.96); transition: opacity 700ms ease, transform 700ms cubic-bezier(.2,.6,.2,1); }
.reveal-scale.is-in { opacity: 1; transform: none; }

/* gradient ribbon divider */
.gradient-rule { height: 2px; width: 100%; background: var(--gradient-brand); border: 0; }

/* chat orb */
.chat-orb { position: fixed; bottom: 24px; right: 24px; z-index: 90; }

/* image slot default look */
image-slot { display: block; background: #f3f3f5; }
.surface-dark image-slot, .slot-dark image-slot { background: #11112b; }

/* hero portrait — natural dimensions, never cropped */
.hero-portrait { display: block; width: 100%; height: auto; border-radius: 10px; }

/* --- Tweak-driven page modes -------------------------------- */
.atmo { transition: opacity 300ms ease; }
body.accent-subtle .atmo { opacity: 0.13 !important; }
body.accent-vivid .atmo { opacity: 0.36 !important; }
body.density-compact .band { padding-top: var(--space-5xl); padding-bottom: var(--space-5xl); }
body.density-compact .band-tight { padding-top: var(--space-3xl); padding-bottom: var(--space-3xl); }
body.motion-off .reveal, body.motion-off .reveal-scale { opacity: 1 !important; transform: none !important; transition: none !important; }

@media (max-width: 900px) {
  .blog-grid { grid-template-columns: 1fr !important; }
  .feat-card { grid-template-columns: 1fr !important; }
}
@media (max-width: 700px) {
  .svc-cols { grid-template-columns: 1fr !important; }
  .contact-form { grid-template-columns: 1fr !important; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-scale { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* --- Responsive --------------------------------------------- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr 1fr; }
  .footer-top .footer-brandcol { grid-column: 1 / -1; }
}
@media (max-width: 960px) {
  .hero-grid, .grid-collapse { grid-template-columns: 1fr !important; }
  .process-row { grid-template-columns: 1fr !important; gap: var(--space-lg) !important; }
  .hero-portrait { max-height: 70vh; width: auto; max-width: 100%; margin: 0 auto; }
}
@media (max-width: 880px) {
  .nav-links, .nav-actions .nav-cta-desktop, .nav-actions .nav-secondary { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .band { padding-top: var(--space-5xl); padding-bottom: var(--space-5xl); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}