/* ==========================================================================
   brainsaw.org — shared styles (every page loads this file).
   Change the look of the site by editing the custom properties just below.
   Sections: 1 Base · 2 Top bar · 3 Bottom bar · 4 Page layout · 5 Components
   ========================================================================== */

:root {
  --bg:         #f8f5f0;   /* warm paper */
  --bg-tint:    #efe9e1;   /* panels, table stripes */
  --ink:        #26303a;   /* body text (dark slate, from the logo) */
  --ink-soft:   #5d6872;   /* secondary text */
  --rule:       #d9d0c4;   /* hairlines */
  --accent:     #b3414f;   /* links and buttons (deep rose, from the brain) */
  --accent-dk:  #8d2f3c;

  --status-active:  #3f9b0b;   /* systems table: grass green */
  --status-pending: #ad4f00;   /* under construction or renovation: dark orange */
  --status-retired: #808080;   /* 50% black, fully opaque */

  --bar-text:   #bfbfbf;   /* 75% white, fully opaque */
  --bar-height: 4rem;

  --font-body:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;

  --page-width: 62rem;
}


/* ---------- 1. Base ------------------------------------------------------ */

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-body);
  line-height: 1.65;
}

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

a { color: var(--accent); }
a:hover, a:focus { color: var(--accent-dk); }

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
}


/* ---------- 2. Top bar ---------------------------------------------------- */
/* Black at 75% opacity with the page (or carousel) blurred behind it. */

.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--bar-height);
  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);  /* 50% white x 60% opaque */
}

.topbar__inner {
  max-width: 84rem;
  height: 100%;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar__logo { display: block; height: 2.6rem; }
.topbar__logo img { height: 100%; width: auto; }

.topbar__links {
  display: flex;
  gap: 2.25rem;
  margin: 0; padding: 0;
  list-style: none;
}

.topbar a { color: var(--bar-text); text-decoration: none; }
.topbar__links a { font-size: 1rem; letter-spacing: 0.04em; padding: 0.4rem 0; }
.topbar__links a:hover,
.topbar__links a:focus,
.topbar__links a[aria-current="page"] { color: #fff; }

/* Hamburger: only shown on narrow screens (see media query below). */
.topbar__toggle {
  display: none;
  width: 2.5rem; height: 2.5rem;
  padding: 0;
  background: none; border: 0;
  cursor: pointer;
}
.topbar__toggle span,
.topbar__toggle span::before,
.topbar__toggle span::after {
  display: block;
  position: relative;
  width: 1.5rem; height: 2px;
  margin: 0 auto;
  background: var(--bar-text);
  content: "";
}
.topbar__toggle span::before { position: absolute; top: -7px; left: 0; }
.topbar__toggle span::after  { position: absolute; top:  7px; left: 0; }

@media (max-width: 40rem) {
  .topbar__inner { justify-content: flex-start; gap: 0.75rem; }
  .topbar__toggle { display: block; order: -1; margin-left: -0.5rem; }

  /* The links become a drop-down panel under the bar. */
  .topbar__links {
    display: none;
    position: absolute;
    top: var(--bar-height); left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
    background: rgba(0, 0, 0, 0.9);   /* more opaque than the bar, so the links stay readable */
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  }
  .topbar__links.is-open { display: flex; }
  .topbar__links a { display: block; padding: 0.8rem 0; font-size: 1.1rem; }
}


/* ---------- 3. Bottom bar (desktop only) ---------------------------------- */

.bottombar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}
.bottombar a {
  color: var(--bar-text);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.bottombar a:hover, .bottombar a:focus { color: #fff; }

@media (max-width: 40rem) { .bottombar { display: none; } }


/* ---------- 4. Page layout (about, systems, publications) ----------------- */

/* Clear the fixed bars above and below the content. */
.page {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: calc(var(--bar-height) + 3rem) 1.25rem 5.5rem;
}

.page h1 { font-size: clamp(2rem, 5vw, 3rem); margin: 0 0 0.5rem; }
.page h2 { font-size: 1.7rem; margin: 3rem 0 0.75rem; }
.page h3 { font-size: 1.25rem; margin: 0 0 0.4rem; }

.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 40rem; }

/* The systems page is wider, to give the map room. */
.page--wide { max-width: 84rem; }


/* ---------- 5. Components ------------------------------------------------- */

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.45rem 1.1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-size: 0.95rem;
  text-decoration: none;
}
.btn:hover, .btn:focus { background: var(--accent-dk); color: #fff; }

/* About page: an image + text block */
.feature {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1.75rem;
  align-items: center;
  margin: 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
}
.feature img { border-radius: 8px; border: 1px solid var(--rule); }
.feature p { margin: 0 0 0.75rem; }
@media (max-width: 40rem) {
  .feature { grid-template-columns: 1fr; }
  .feature img { max-width: 11rem; }
}

/* About page: the video */
.video { max-width: 46rem; margin: 1.5rem auto; }   /* auto side margins centre it */
.video__frame { position: relative; aspect-ratio: 16 / 9; background: #000; }
.video__frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video figcaption { font-size: 0.9rem; color: var(--ink-soft); margin-top: 0.4rem; }

/* Systems page: the table */
.table-wrap { overflow-x: auto; }
.systems-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.systems-table th, .systems-table td {
  text-align: left;
  padding: 0.55rem 0.8rem;
  vertical-align: top;
}
.systems-table th { font-family: var(--font-heading); font-size: 1rem; border-bottom: 2px solid var(--ink); }
/* One <tbody> per site: the rule and the stripe go round the site, not each of its systems. */
.systems-table tbody { border-bottom: 1px solid var(--rule); }
.systems-table tbody:nth-of-type(even) { background: var(--bg-tint); }
/* A site's systems sit close together, keeping the full padding above the first and below the last. */
.systems-table tbody tr:not(:first-child) td { padding-top: 0.1rem; }
.systems-table tbody tr:not(:last-child) td:not([rowspan]) { padding-bottom: 0.1rem; }
.systems-table .status { white-space: nowrap; }
.systems-table .status[data-status="in-use"]   { color: var(--status-active); font-weight: 700; }
.systems-table .status[data-status="building"],
.systems-table .status[data-status="paused"]   { color: var(--status-pending); }
/* A retired system: its whole line is grey, and the site's cells too once every system there is retired. */
.systems-table tr.retired td:not([rowspan]),
.systems-table tr.retired td:not([rowspan]) .note,
.systems-table tbody.retired td,
.systems-table tbody.retired .note             { color: var(--status-retired); }
.systems-table .note { display: block; color: var(--ink-soft); font-size: 0.85rem; }

/* Banner image under the top bar, with the page title over it */
.banner {
  position: relative;
  height: 10.5rem;                    /* includes the 4rem under the top bar */
  padding-top: var(--bar-height);
  background: #1b2030 center / cover no-repeat;
  color: #fff;
}
.banner::after {                      /* darken the lower edge so the title reads */
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0) 35%, rgba(0,0,0,0.65));
}
.banner__inner {
  position: absolute; z-index: 1;
  left: 0; right: 0; bottom: 1.1rem;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}
.banner h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.4rem); text-shadow: 0 2px 12px rgba(0,0,0,0.5); }
.banner--wide .banner__inner { max-width: 84rem; }   /* for pages using .page--wide */
.page--below-banner { padding-top: 2.5rem; }

/* About page: the in-house systems */
.photo-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1.5rem 0; }
.photo-row figure { margin: 0; }
.photo-row img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 8px; }
.photo-row figcaption { font-size: 0.9rem; color: var(--ink-soft); margin-top: 0.4rem; }
@media (max-width: 40rem) { .photo-row { grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem; } }