/* ============================================================
   Frontiers Research Hub — Base & Reset
   ============================================================ */

/* Fonts */
@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: var(--fw-reg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }

a { color: inherit; text-decoration: none; }

button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: var(--c-cyan-soft); color: var(--c-text); }

/* ---- Headings ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-semi);
  letter-spacing: var(--track-tight);
  line-height: var(--lh-tight);
  margin: 0 0 0.5em;
  color: var(--c-text);
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: var(--lh-snug); }
h4 { font-size: var(--fs-h4); }

p { margin: 0 0 1em; color: var(--c-muted); max-width: var(--maxw-text); }

/* ---- Utility: mono eyebrow / label ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-med);
  text-transform: uppercase;
  letter-spacing: var(--track-wide);
  color: var(--c-cyan);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin: 0 0 var(--s-4);
}
.eyebrow::before {
  content: "";
  width: 1.6em; height: 1px;
  background: var(--grad-signature);
  display: inline-block;
}

.meta {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: var(--track-wide);
  color: var(--c-faint);
}

/* ---- Signature gradient text ---- */
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead { font-size: var(--fs-lead); color: var(--c-muted); line-height: 1.6; }

/* ---- Layout helpers ---- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-pad-y); position: relative; }
.section--deep { background: var(--c-bg-deep); }

.grid { display: grid; gap: var(--s-5); }
.section-intro { max-width: 60ch; margin-bottom: var(--s-7); }

/* ---- Buttons ---- */
.btn {
  --btn-pad-y: 0.85em;
  --btn-pad-x: 1.6em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semi);
  letter-spacing: 0.01em;
  padding: var(--btn-pad-y) var(--btn-pad-x);
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  white-space: nowrap;
  flex: 0 0 auto;
  line-height: 1;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              background var(--dur-med) var(--ease-out),
              border-color var(--dur-med) var(--ease-out);
  will-change: transform;
}

.btn--primary {
  background: var(--grad-signature);
  color: #06090F;
  box-shadow: 0 0 0 rgba(34,211,238,0);
}
.btn--primary:hover {
  box-shadow: 0 0 30px rgba(34, 211, 238, 0.45), 0 0 60px rgba(99,102,241,0.25);
  transform: translateY(-2px);
}

.btn--ghost {
  background: rgba(255,255,255,0.02);
  color: var(--c-text);
  border-color: var(--c-hairline-2);
}
.btn--ghost:hover {
  border-color: rgba(34, 211, 238, 0.5);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.btn--sm { --btn-pad-y: 0.6em; --btn-pad-x: 1.1em; font-size: 0.85rem; }

/* ---- Cards ---- */
.card {
  background: var(--c-panel);
  border: 1px solid var(--c-hairline);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  box-shadow: var(--shadow-card), var(--glow-inner);
  position: relative;
  transition: transform var(--dur-med) var(--ease-out),
              border-color var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out);
}
.card:hover {
  border-color: rgba(34, 211, 238, 0.28);
  box-shadow: var(--shadow-soft), 0 0 40px -8px rgba(34,211,238,0.25), var(--glow-inner);
}

/* Gradient-border card variant */
.card--accent { position: relative; }
.card--accent::before {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-signature);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0.5;
  transition: opacity var(--dur-med) var(--ease-out);
  pointer-events: none;
}
.card--accent:hover::before { opacity: 1; }

/* Chip / tag / badge */
.chip {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  text-transform: uppercase;
  letter-spacing: var(--track-wide);
  color: var(--c-muted);
  padding: 0.4em 0.9em;
  border: 1px solid var(--c-hairline-2);
  border-radius: var(--r-pill);
  background: rgba(255,255,255,0.02);
}
.chip--live { color: var(--c-green); border-color: rgba(52,211,153,0.3); }
.chip--live::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--c-green); box-shadow: 0 0 8px var(--c-green);
}

/* ---- Confirm marker (content placeholders) ---- */
.confirm {
  font-family: var(--font-mono);
  font-size: 0.8em;
  color: #0A0E16;
  background: #FBBF24;
  padding: 0.1em 0.5em;
  border-radius: 5px;
  font-weight: 600;
  white-space: nowrap;
}

/* ---- Section glow backdrop helper ---- */
.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

/* ---- Accessibility: reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Skip link */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--c-cyan); color: #06090F;
  padding: 0.7em 1.2em; border-radius: 0 0 8px 0;
  font-weight: 600; z-index: var(--z-modal);
}
.skip-link:focus { left: 0; }