/*
  base.css
  ---------
  Resets, base typography, and the two-column app shell (sidebar + topbar +
  content). Page-specific styling lives in its own stylesheet.
*/

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  background-image: var(--gradient-hull);
  background-attachment: fixed;
  min-height: 100vh;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  margin: 0;
  letter-spacing: -0.01em;
  font-weight: 600;
}

p { margin: 0; }

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

button {
  font-family: var(--font-body);
  cursor: pointer;
}

::selection { background: var(--signal-green-dim); color: var(--text-primary); }

/* Scrollbars -- thin, hairline, matches the instrument-panel feel */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--radius-pill); }
*::-webkit-scrollbar-track { background: transparent; }

:focus-visible {
  outline: 2px solid var(--signal-green);
  outline-offset: 2px;
  border-radius: 4px;
}

.mono { font-family: var(--font-mono); letter-spacing: -0.01em; }

/* ---------------------------------------------------------------------- */
/* App shell                                                                */
/* ---------------------------------------------------------------------- */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.main-column {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.content {
  flex: 1;
  padding: var(--sp-7);
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

@media (max-width: 1100px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .content { padding: var(--sp-5); }
}

/* ---------------------------------------------------------------------- */
/* Page header                                                             */
/* ---------------------------------------------------------------------- */

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--sp-7);
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.page-header .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--signal-green);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--sp-2);
  display: block;
}

.page-header h1 {
  font-size: var(--fs-2xl);
}

.page-header .page-sub {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  margin-top: var(--sp-2);
}

.header-actions { display: flex; gap: var(--sp-3); align-items: center; }