/* ============================================================
   SBL — Solutions Based Learning
   Shared design system

   Signature motif: the contour line. Geography is the live
   subject and the whole ecosystem's founding metaphor — reading
   a landscape by its contours, then finding a route through it.
   The same line language appears three ways:
     1. Ambient topographic contours (backgrounds)
     2. The Thinking Pathway (THINK → SOLVE, a route through the hub)
     3. Syllabus trail nodes (a route through a subject)
   ============================================================ */

:root {
  /* ---- Color ---- */
  --ink:          #060D16;   /* deepest background, page edges */
  --navy:         #0B1929;   /* primary background */
  --navy-raised:  #10233A;   /* panel surfaces */
  --navy-line:    #1B3247;   /* hairlines / dividers on navy */
  --teal:         #17B8A6;   /* SBL brand teal — live / active */
  --teal-bright:  #2DE1CB;   /* glow, hover, high-emphasis */
  --white:        #F6FAFA;   /* primary text on navy */
  --slate:        #7C93A3;   /* secondary text */
  --slate-dim:    #445A6B;   /* muted / coming-soon state */
  --slate-dimmer: #2A3B49;   /* coming-soon borders */

  /* ---- Type ---- */
  --font-display: 'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'IBM Plex Mono', 'SFMono-Regular', monospace;

  /* ---- Motion ---- */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

@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;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

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

/* ---- Ambient topographic contours ----
   A single repeating SVG of nested, imperfect contour rings,
   used at very low opacity as atmosphere. Never decorative-only
   noise: on the geography pages the same linework reappears at
   full strength as real UI (the trail), so the background reads
   as "the same world, zoomed out." */
.sbl-contours {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='800' height='800' viewBox='0 0 800 800'%3E%3Cg fill='none' stroke='%2317B8A6' stroke-width='1'%3E%3Cpath d='M-50 620 Q 150 560 300 610 T 650 580 T 900 640'/%3E%3Cpath d='M-50 500 Q 180 430 340 490 T 700 450 T 900 510'/%3E%3Cpath d='M-50 380 Q 200 300 380 370 T 720 320 T 900 390'/%3E%3Cpath d='M-50 260 Q 220 170 400 250 T 740 190 T 900 270'/%3E%3Cpath d='M-50 140 Q 240 40 420 130 T 760 60 T 900 150'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 800px 800px;
  background-repeat: repeat;
  animation: driftContours 90s linear infinite;
}
@keyframes driftContours {
  from { background-position: 0 0; }
  to   { background-position: -800px -400px; }
}

/* ---- Skip link / focus ---- */
.sbl-skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--teal);
  color: var(--ink);
  padding: 0.75rem 1.25rem;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.sbl-skip:focus { left: 1rem; top: 1rem; }

:focus-visible {
  outline: 2px solid var(--teal-bright);
  outline-offset: 3px;
}

/* ---- Eyebrow / mono labels (status, coordinates, taglines) ---- */
.sbl-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.sbl-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.sbl-status--live { color: var(--teal-bright); }
.sbl-status--soon { color: var(--slate-dim); }
.sbl-status__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor;
}
.sbl-status--live .sbl-status__dot { box-shadow: 0 0 8px var(--teal-bright); animation: pulseDot 2.2s var(--ease) infinite; }
@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.75); }
}

/* ---- Footer ---- */
.sbl-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 3rem 1.5rem 4rem;
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  color: var(--slate);
  border-top: 1px solid var(--navy-line);
  max-width: 720px;
  margin: 0 auto;
}