/*
 * Perigee Doctrine, teaser landing stylesheet.
 * Single hand-authored stylesheet implementing the APPROVED 01-UI-SPEC token system.
 * No framework, no build step. Tokens live in :root below.
 *
 * Fonts: self-hosted WOFF2 under assets/fonts/ via @font-face below, NO Google Fonts CDN
 * (GDPR/DSGVO: no visitor IP sent to third parties). Fonts are OFL-1.1 (LICENSES/OFL-1.1.txt).
 *
 * Contrast: muted text #8B98AD verified AA on both backgrounds , 
 *   on #0A0F1A ≈ 6.56:1, on #131B2A ≈ 5.90:1 (both ≥ 4.5:1, WCAG 2.1 AA body text).
 */

/* --- Self-hosted fonts (WOFF2, latin subset incl. Western-European/umlauts).
       NO Google Fonts CDN, GDPR/DSGVO. font-display: swap for FOIT-free render. --- */
@font-face {
  font-family: "Space Grotesk"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("fonts/space-grotesk-400.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("fonts/space-grotesk-700.woff2") format("woff2");
}
@font-face {
  font-family: "Inter"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("fonts/inter-400.woff2") format("woff2");
}
@font-face {
  font-family: "Inter"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("fonts/inter-700.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("fonts/jetbrains-mono-400.woff2") format("woff2");
}

:root {
  /* --- Color (60/30/10) --- */
  --color-bg: #0A0F1A;          /* dominant 60%, orbital night */
  --color-surface: #131B2A;     /* secondary 30%, cards/bands/media frame */
  --color-accent: #4FD2E2;      /* accent 10%, RESERVED list only */
  --color-error: #F8857A;       /* email-form validation only */
  --color-text: #E6EDF5;        /* primary text */
  --color-muted: #8B98AD;       /* eyebrows, captions, footer */
  --color-hairline: #243047;    /* borders */
  --color-choir: #B69CFF;       /* Choir-violet, §5 pull-quote text ONLY */

  /* accent CTA text sits on the accent fill for AA contrast */
  --color-on-accent: #0A0F1A;

  /* --- Spacing scale (multiples of 4) --- */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* page-level vertical rhythm (mobile defaults; desktop bumped in @media) */
  --space-section: 64px;
  --space-hero: 80px;

  /* --- Typography (exactly 4 sizes, weights 400/700) --- */
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --size-eyebrow: 14px;                       /* JetBrains Mono 400 */
  --size-body: 18px;                          /* Inter 400 */
  --size-heading: 32px;                       /* Space Grotesk 700 */
  --size-display: clamp(40px, 6vw, 56px);     /* Space Grotesk 700 */

  --maxw: 1200px;
  --gutter: 16px;       /* mobile */
  --radius: 8px;
  --transition: 200ms ease-out;
}

@media (min-width: 768px) {
  :root {
    --space-section: 96px;
    --space-hero: 128px;
    --gutter: 24px;
  }
}

/* ====================================================================
   Base / reset
==================================================================== */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

h1, h2, h3 { margin: 0; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.body-text { max-width: 66ch; }

.muted { color: var(--color-muted); }

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

/* ====================================================================
   Focus + skip link (accent reserved use #3)
==================================================================== */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -100px;
  z-index: 100;
  background: var(--color-accent);
  color: var(--color-on-accent);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  text-decoration: none;
  transition: top var(--transition);
}
.skip-link:focus { top: var(--space-md); }

/* ====================================================================
   Buttons + links
==================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;                 /* tap target */
  padding: 0 var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), transform var(--transition);
}

/* primary = accent fill (reserved use #1) */
.btn-primary {
  background: var(--color-accent);
  color: var(--color-on-accent);
  border-color: var(--color-accent);
}
.btn-primary:hover { background: #6fdfed; border-color: #6fdfed; }
.btn-primary:active { transform: translateY(1px); }

/* secondary = ghost/outlined accent (no fill, keeps 10% budget) */
.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-secondary:hover { background: rgba(79, 210, 226, 0.10); }
.btn-secondary:active { transform: translateY(1px); }

.btn-compact { min-height: 38px; padding: 0 var(--space-md); font-size: var(--size-eyebrow); }

/* quiet text link (link hover/active underline = accent reserved use #2) */
.link-quiet {
  align-self: center;
  color: var(--color-muted);
  font-size: var(--size-eyebrow);
  font-family: var(--font-mono);
  text-decoration: none;
}
.link-quiet:hover, .link-quiet:active {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
}

/* ====================================================================
   Header / nav
==================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--color-hairline);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 60px;
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--size-body);
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--color-text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.nav-links a:not(.btn) {
  display: none;                    /* anchor links hidden on mobile */
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-muted);
}
.nav-links a:not(.btn):hover { color: var(--color-accent); text-decoration: underline; }
@media (min-width: 768px) {
  .nav-links a:not(.btn) { display: inline; }
}

/* ====================================================================
   Hero (section 2)
==================================================================== */
.hero { padding-block: var(--space-hero); }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
@media (min-width: 768px) {
  .hero-grid { grid-template-columns: 1.4fr 1fr; }
}

.eyebrow {
  margin: 0 0 var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  font-weight: 400;
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}
.display {
  font-family: var(--font-display);
  font-size: var(--size-display);
  font-weight: 700;
  line-height: 1.05;
  margin: 0 0 var(--space-lg);
}
.hero-sub { margin: 0 0 var(--space-xl); color: var(--color-text); }
.hero-sub strong { color: var(--color-text); font-weight: 700; }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

/* perigee-line / sensor motif (accent reserved use #4) */
.hero-motif { display: flex; justify-content: center; }
.perigee-line { width: 100%; max-width: 320px; height: auto; }
.perigee-line circle, .perigee-line path { fill: none; stroke: var(--color-hairline); stroke-width: 1.5; }
.perigee-line .orbit-arc { stroke: var(--color-accent); stroke-width: 2; }
.perigee-line .planet { fill: var(--color-surface); stroke: var(--color-hairline); }
.perigee-line .station { fill: var(--color-accent); stroke: none; }
.perigee-line .station.faint { fill: var(--color-muted); }

/* ====================================================================
   Section bands
==================================================================== */
.band-secondary { background: var(--color-surface); }

section { padding-block: var(--space-section); }
.hero { padding-block: var(--space-hero); }   /* hero keeps its own rhythm */

/* ====================================================================
   Magic moment (section 3)
==================================================================== */
.media-figure { margin: 0; }
.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  background: var(--color-bg);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius);
  overflow: hidden;
}
.media-placeholder { width: 100%; height: 100%; }
.media-bg { fill: var(--color-bg); }
.media-baseline { stroke: var(--color-hairline); stroke-width: 1; fill: none; }
.media-trace { stroke: var(--color-accent); stroke-width: 2; fill: none; stroke-linejoin: round; opacity: 0.85; }
.media-ping { fill: var(--color-accent); }
.caption {
  margin: var(--space-md) 0 0;
  font-size: var(--size-eyebrow);
  font-family: var(--font-mono);
  line-height: 1.4;
  max-width: 66ch;
}

/* ====================================================================
   Pillars (section 4)
==================================================================== */
.pillar-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}
@media (min-width: 768px) {
  .pillar-grid { grid-template-columns: repeat(3, 1fr); }
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius);
  padding: var(--space-lg);
}
.pillar-title {
  font-family: var(--font-display);
  font-size: var(--size-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
}

/* ====================================================================
   Choir pull-quote (section 5), the ONLY use of Choir-violet
==================================================================== */
.choir-band {
  background: var(--color-bg);
  border-block: 1px solid var(--color-hairline);
}
.choir-quote { margin: 0; text-align: center; }
.choir-text {
  font-family: var(--font-mono);
  font-size: var(--size-body);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-choir);          /* #B69CFF, reserved to this quote */
  margin: 0 auto var(--space-md);
  max-width: 60ch;
}
.choir-attrib {
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

/* ====================================================================
   Build-in-public band (section 6)
==================================================================== */
.build-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
}
@media (min-width: 768px) {
  .build-grid { grid-template-columns: 1.2fr 1fr; }
}
.section-heading {
  font-family: var(--font-display);
  font-size: var(--size-heading);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
}

.signup-card { padding: var(--space-lg); }
.signup-form { display: block; }
.signup-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: var(--space-sm);
}
.signup-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.signup-input {
  flex: 1 1 200px;
  min-height: 44px;
  padding: 0 var(--space-md);
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--size-body);
}
.signup-input::placeholder { color: var(--color-muted); }
.signup-input:hover { border-color: var(--color-accent); }
.signup-note { margin: var(--space-sm) 0 0; font-size: var(--size-eyebrow); font-family: var(--font-mono); }
.signup-status { margin: var(--space-sm) 0 0; font-size: var(--size-eyebrow); font-family: var(--font-mono); }
.signup-status[data-state="error"] { color: var(--color-error); }
.signup-status[data-state="success"] { color: var(--color-accent); }

/* ====================================================================
   Footer (section 7)
==================================================================== */
.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-hairline);
  padding-block: var(--space-3xl);
}
.footer-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.footer-license { margin: 0; font-size: var(--size-eyebrow); font-family: var(--font-mono); line-height: 1.5; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-md); }
.footer-links a {
  font-family: var(--font-mono);
  font-size: var(--size-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-muted);
}
.footer-links a:hover { color: var(--color-accent); text-decoration: underline; }
.footer-copy { margin: 0; font-size: var(--size-eyebrow); font-family: var(--font-mono); }

/* ====================================================================
   Scroll-in reveal, JS-gated so content is never hidden without JS.
==================================================================== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 250ms ease-out, transform 250ms ease-out;
}
.js [data-reveal].in-view { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
}

/* Language toggle (EN/DE), compact, stable width so the label swap doesn't shift the nav. */
.lang-toggle {
  min-width: 3.25rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}