/* =========================================================================
   Nimbus Nexus placeholder page
   Styling is driven entirely by Nimbus Design tokens.
   Token values mirror nimbus-design/tokens/*.json and
   nimbus-design/design-system/05-code/css-tokens.md (the --nn-* layer).
   ========================================================================= */

:root {
  /* Backgrounds */
  --nn-color-bg: #05070B;
  --nn-color-panel: #0C111A;
  --nn-color-surface: #141B27;

  /* Text */
  --nn-color-text-primary: #F3F6FA;
  --nn-color-text-secondary: #9BA8BA;
  --nn-color-text-muted: #6C778A;

  /* Brand */
  --nn-color-brand-purple: #9B5CFF;
  --nn-color-brand-indigo: #6D73FF;
  --nn-color-brand-blue: #3CAEFF;
  --nn-color-brand-cyan: #33E6FF;
  --nn-gradient-brand: linear-gradient(135deg, #9B5CFF 0%, #6D73FF 35%, #3CAEFF 70%, #33E6FF 100%);

  /* Semantic */
  --nn-color-info: #3CAEFF;

  /* Borders */
  --nn-border-default: rgba(255, 255, 255, 0.08);
  --nn-border-emphasis: rgba(255, 255, 255, 0.12);

  /* Spacing: 8-point scale */
  --nn-space-1: 4px;
  --nn-space-2: 8px;
  --nn-space-3: 16px;
  --nn-space-4: 24px;
  --nn-space-5: 32px;
  --nn-space-6: 48px;
  --nn-space-7: 64px;
  --nn-space-8: 96px;
  --nn-space-9: 128px;

  /* Radius */
  --nn-radius-sm: 8px;
  --nn-radius-md: 16px;
  --nn-radius-lg: 24px;
  --nn-radius-xl: 32px;
  --nn-radius-pill: 999px;

  /* Typography */
  --nn-font-display: "Space Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --nn-font-body: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --nn-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --nn-font-size-display-xl: 72px;
  --nn-line-height-display-xl: 1.0;
  --nn-font-size-display-l: 56px;
  --nn-line-height-display-l: 1.05;
  --nn-font-size-h1: 44px;
  --nn-line-height-h1: 1.1;
  --nn-font-size-h2: 32px;
  --nn-line-height-h2: 1.2;
  --nn-font-size-h3: 24px;
  --nn-line-height-h3: 1.25;
  --nn-font-size-body-l: 18px;
  --nn-line-height-body-l: 1.6;
  --nn-font-size-body: 16px;
  --nn-line-height-body: 1.6;
  --nn-font-size-small: 14px;
  --nn-line-height-small: 1.5;
  --nn-font-size-micro: 12px;
  --nn-line-height-micro: 1.4;

  /* Motion */
  --nn-duration-hover: 150ms;
  --nn-duration-card: 250ms;
  --nn-duration-hero-ambient: 20s;

  /* Layout */
  --nn-width-marketing: 1200px;
  --nn-width-reading: 760px;
}

/* ------------------------------------------------------------------ Reset */

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

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

body {
  margin: 0;
  background-color: var(--nn-color-bg);
  color: var(--nn-color-text-secondary);
  font-family: var(--nn-font-body);
  font-size: var(--nn-font-size-body);
  line-height: var(--nn-line-height-body);
  font-feature-settings: "ss01", "cv05";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

:focus-visible {
  outline: 2px solid var(--nn-color-brand-blue);
  outline-offset: 3px;
  border-radius: var(--nn-radius-sm);
}

/* ------------------------------------------------------ Skip link / a11y */

.skip-link {
  position: absolute;
  left: var(--nn-space-3);
  top: -120px;
  z-index: 100;
  padding: var(--nn-space-2) var(--nn-space-4);
  background: var(--nn-color-surface);
  color: var(--nn-color-text-primary);
  border: 1px solid var(--nn-border-emphasis);
  border-radius: var(--nn-radius-sm);
  font-size: var(--nn-font-size-small);
  text-decoration: none;
  transition: top var(--nn-duration-hover) ease;
}

.skip-link:focus {
  top: var(--nn-space-3);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

/* ----------------------------------------------------------- Containers */

.container {
  width: 100%;
  max-width: var(--nn-width-marketing);
  margin-inline: auto;
  padding-inline: var(--nn-space-4);
}

/* --------------------------------------------------- Ambient background */
/* Approved Nimbus brand motifs only: restrained flow glow + faint grid.
   Decorative, so hidden from assistive tech. */

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.ambient__glow {
  position: absolute;
  top: -10%;
  left: 50%;
  width: min(1100px, 120vw);
  aspect-ratio: 1;
  transform: translateX(-50%);
  background:
    radial-gradient(circle at 38% 40%, rgba(155, 92, 255, 0.20), transparent 60%),
    radial-gradient(circle at 62% 55%, rgba(51, 230, 255, 0.16), transparent 62%),
    radial-gradient(circle at 50% 48%, rgba(109, 115, 255, 0.16), transparent 65%);
  filter: blur(40px);
  opacity: 0.9;
  animation: ambient-drift var(--nn-duration-hero-ambient) ease-in-out infinite alternate;
}

.ambient__grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(155, 168, 186, 0.10) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 60%);
          mask-image: radial-gradient(circle at 50% 22%, #000 0%, transparent 60%);
  opacity: 0.5;
}

@keyframes ambient-drift {
  from { transform: translateX(-50%) translateY(0) scale(1); }
  to   { transform: translateX(-50%) translateY(24px) scale(1.05); }
}

/* ---------------------------------------------------------------- Header */

.site-header {
  padding-block: var(--nn-space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--nn-space-3);
  text-decoration: none;
}

.brand__mark {
  width: 40px;
  height: 40px;
  flex: none;
  /* Logo art is an additive glow on solid black; screen drops the black
     background to transparent against the dark page without distortion. */
  mix-blend-mode: screen;
}

.brand__name {
  font-family: var(--nn-font-display);
  font-size: var(--nn-font-size-body-l);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--nn-color-text-primary);
}

/* ------------------------------------------------------------------ Hero */

.hero {
  padding-block: var(--nn-space-8) var(--nn-space-7);
  text-align: center;
}

.hero__logo {
  width: clamp(180px, 34vw, 280px);
  height: auto;
  margin: 0 auto var(--nn-space-6);
  /* Screen drops the logo's solid-black background against the dark page;
     the mark already carries its own earned glow, reinforced by the ambient
     field behind it, so no extra drop-shadow is needed. */
  mix-blend-mode: screen;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--nn-space-2);
  margin-bottom: var(--nn-space-4);
  padding: var(--nn-space-1) var(--nn-space-3);
  border: 1px solid var(--nn-border-emphasis);
  border-radius: var(--nn-radius-pill);
  background: var(--nn-color-panel);
  color: var(--nn-color-text-secondary);
  font-size: var(--nn-font-size-micro);
  line-height: var(--nn-line-height-micro);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow__dot {
  width: 7px;
  height: 7px;
  border-radius: var(--nn-radius-pill);
  background: var(--nn-color-brand-cyan);
  box-shadow: 0 0 10px rgba(51, 230, 255, 0.8);
}

.hero__title {
  margin: 0 auto var(--nn-space-4);
  max-width: 16ch;
  font-family: var(--nn-font-display);
  font-weight: 600;
  font-size: clamp(40px, 7vw, var(--nn-font-size-display-l));
  line-height: var(--nn-line-height-display-l);
  letter-spacing: -0.02em;
  color: var(--nn-color-text-primary);
}

.hero__lead {
  margin: 0 auto;
  max-width: 60ch;
  font-size: var(--nn-font-size-body-l);
  line-height: var(--nn-line-height-body-l);
  color: var(--nn-color-text-secondary);
}

/* --------------------------------------------------------- Section base */

.section {
  padding-block: var(--nn-space-7);
}

.section__head {
  max-width: var(--nn-width-reading);
  margin-bottom: var(--nn-space-6);
}

.section__eyebrow {
  margin: 0 0 var(--nn-space-2);
  font-size: var(--nn-font-size-micro);
  line-height: var(--nn-line-height-micro);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--nn-color-text-muted);
}

.section__title {
  margin: 0 0 var(--nn-space-3);
  font-family: var(--nn-font-display);
  font-weight: 600;
  font-size: var(--nn-font-size-h2);
  line-height: var(--nn-line-height-h2);
  letter-spacing: -0.01em;
  color: var(--nn-color-text-primary);
}

.section__text {
  margin: 0;
  max-width: var(--nn-width-reading);
  color: var(--nn-color-text-secondary);
}

/* --------------------------------------------------------- Notice panel */

.notice {
  display: flex;
  gap: var(--nn-space-3);
  align-items: flex-start;
  padding: var(--nn-space-4) var(--nn-space-5);
  background: var(--nn-color-panel);
  border: 1px solid var(--nn-border-default);
  border-radius: var(--nn-radius-lg);
}

.notice__icon {
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  color: var(--nn-color-info);
}

.notice__body {
  margin: 0;
  font-size: var(--nn-font-size-body);
  color: var(--nn-color-text-secondary);
}

.notice__body strong {
  color: var(--nn-color-text-primary);
  font-weight: 600;
}

/* ---------------------------------------------------------- Areas grid */

.areas {
  display: grid;
  gap: var(--nn-space-4);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.card {
  padding: var(--nn-space-5);
  background: var(--nn-color-panel);
  border: 1px solid var(--nn-border-default);
  border-radius: var(--nn-radius-md);
  transition:
    border-color var(--nn-duration-card) ease,
    transform var(--nn-duration-card) ease,
    background-color var(--nn-duration-card) ease;
}

.card:hover {
  border-color: var(--nn-border-emphasis);
  background: var(--nn-color-surface);
  transform: translateY(-2px);
}

.card__icon {
  width: 36px;
  height: 36px;
  margin-bottom: var(--nn-space-4);
  color: var(--nn-color-brand-blue);
}

.card__title {
  margin: 0 0 var(--nn-space-2);
  font-family: var(--nn-font-display);
  font-weight: 600;
  font-size: var(--nn-font-size-h3);
  line-height: var(--nn-line-height-h3);
  color: var(--nn-color-text-primary);
}

.card__text {
  margin: 0;
  font-size: var(--nn-font-size-body);
  color: var(--nn-color-text-secondary);
}

/* ---------------------------------------------------------------- Footer */

.site-footer {
  margin-top: var(--nn-space-7);
  border-top: 1px solid var(--nn-border-default);
  padding-block: var(--nn-space-6);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--nn-space-4);
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--nn-space-3);
}

.footer__mark {
  width: 28px;
  height: 28px;
  flex: none;
  mix-blend-mode: screen;
}

.footer__name {
  font-family: var(--nn-font-display);
  font-size: var(--nn-font-size-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--nn-color-text-primary);
}

.footer__meta {
  margin: 0;
  font-size: var(--nn-font-size-small);
  color: var(--nn-color-text-muted);
}

.footer__tagline {
  font-family: var(--nn-font-display);
  font-size: var(--nn-font-size-small);
  letter-spacing: 0.04em;
  color: var(--nn-color-text-secondary);
}

/* ----------------------------------------------------------- Responsive */

@media (max-width: 768px) {
  .hero {
    padding-block: var(--nn-space-7) var(--nn-space-6);
  }

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

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ------------------------------------------------------- Reduced motion */

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

  .ambient__glow {
    animation: none;
  }
}