/* ============================================================
   Base: resets, element defaults, the type scale, ambient canvas,
   utilities. No component classes here.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  /* Hidden tooltips (visibility:hidden pseudo-elements) on right-edge
     buttons still count as scrollable overflow - never let them, or any
     other off-canvas decoration, create a horizontal scrollbar. Applies
     to the viewport, so sticky positioning is unaffected. */
  overflow-x: hidden;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-feature-settings: "ss01", "cv11";
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-top: env(safe-area-inset-top, 0px);
  position: relative;
  isolation: isolate;
}

/* Ambient atrium glow: two soft radial light sources fixed behind every
   page (the mockup's ::before). A fixed, non-interactive layer - it
   never repaints on scroll and costs nothing per frame. */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(60vw 42vh at 88% -12%, var(--ambient-a), transparent 62%),
    radial-gradient(48vw 40vh at -12% 18%, var(--ambient-b), transparent 58%);
  opacity: var(--opacity-ambient);
}

/* ---------------------------------------------------------------- type scale */

h1, h2, h3, h4 {
  margin: 0;
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  text-wrap: balance;
}
h1 { font-size: var(--text-xl); letter-spacing: var(--tracking-tighter); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-md); }
h4 { font-size: var(--text-base); }

.display { font-size: var(--text-3xl); font-weight: var(--weight-semibold); letter-spacing: var(--tracking-tighter); line-height: var(--leading-none); }

p { margin: 0 0 var(--space-3); text-wrap: pretty; }

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
  transition: color var(--duration-fast) var(--ease-out);
}
a:hover { text-decoration: underline; }

.mono, code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
}
code {
  font-size: 0.92em;
  padding: var(--space-0-5) var(--space-1-5);
  border-radius: var(--radius-xs);
  background: var(--bg-hover);
  border: var(--border-w) solid var(--border);
}
kbd {
  font-size: var(--text-2xs);
  padding: var(--space-0-5) var(--space-1-5);
  border-radius: var(--radius-xs);
  border: var(--border-w) solid var(--border-strong);
  border-bottom-width: var(--border-w-thick);
  background: var(--bg-elevated);
  color: var(--text-dim);
}

/* Every live number is tabular - digits never jitter as values tick. */
.tnum, .stat-value, .count-chip, .hero-chip, time, td.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

.text-dim { color: var(--text-dim); }
.text-faint { color: var(--text-faint); }

::selection {
  background: var(--accent-tint-strong);
  color: var(--text);
}

/* scrollbars: thin, theme-matched, non-intrusive */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--radius-full); border: 3px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background-color: var(--text-faint); }

/* focus-visible ring, applied consistently to every interactive element */
:focus { outline: none; }
:focus-visible {
  outline: var(--border-w-thick) solid var(--accent-ring);
  outline-offset: var(--space-0-5);
  border-radius: var(--radius-sm);
}

[hidden] { display: none !important; }

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

/* Skip link: invisible until focused by keyboard. */
.skip-link {
  position: fixed; top: var(--space-3); left: var(--space-3); z-index: var(--z-modal);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-full);
  background: var(--accent-solid); color: var(--text-on-accent); font-weight: var(--weight-semibold);
  transform: translateY(-200%);
  transition: transform var(--duration-base) var(--ease-out);
}
.skip-link:focus-visible { transform: translateY(0); text-decoration: none; }

.icon {
  width: var(--icon-md); height: var(--icon-md);
  flex: none;
  display: inline-block;
  vertical-align: middle;
  stroke-width: 1.75;
}
.icon-sm { width: var(--icon-sm); height: var(--icon-sm); }
.icon-lg { width: var(--icon-lg); height: var(--icon-lg); }
.icon-sprite { display: none; }
/* gradient/filter defs must stay rendered (display:none breaks url(#id) refs) */
.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; pointer-events: none; }

/* ---------------------------------------------------------------- utilities
   A small, closed set of layout utilities - used instead of inline
   style="" attributes. */

.m-0 { margin: 0; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.ml-auto { margin-left: auto; }
.p-0 { padding: 0; }
.w-full { width: 100%; }
.gap-2 { gap: var(--space-2); }
.max-w-sm { max-width: 320px; }
.input-fixed-sm { width: 90px; flex: none; }
.text-normal { text-transform: none; font-weight: var(--weight-normal); letter-spacing: normal; }
.cursor-default { cursor: default; }
.stat-unit { font-size: 0.55em; font-weight: var(--weight-medium); color: var(--text-dim); margin-left: var(--space-0-5); letter-spacing: 0; }
.text-xs { font-size: var(--text-xs); }
.grid-cols-main-side { grid-template-columns: 1.3fr 1fr; }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-danger { border-color: var(--danger); }
.vnc-frame-box {
  position: relative;
  border-radius: var(--radius-lg); overflow: hidden; border: var(--border-w) solid var(--glass-border);
  background: var(--canvas-black); min-height: 60vh;
  box-shadow: var(--shadow-md);
}

/* Status overlay for an embedded noVNC viewer - shared by /vnc and the
   Accounts sign-in panel so neither one can ever be a canvas with no
   feedback: every embed must show Connecting/Launching/Ready/Failed. */
.vnc-status-overlay {
  position: absolute;
  inset: 0;
  background: var(--scrim);
  backdrop-filter: blur(var(--blur-xs));
  -webkit-backdrop-filter: blur(var(--blur-xs));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  z-index: var(--z-sticky);
  color: var(--text);
  text-align: center;
  padding: var(--space-4);
  animation: fade-in var(--duration-base) var(--ease-out);
}
.vnc-status-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--surface-2);
  border: var(--border-w) solid var(--border-strong);
  max-width: 380px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: pop-in var(--duration-slow) var(--ease-out);
}
.vnc-status-title { font-size: var(--text-md); font-weight: var(--weight-semibold); }
.vnc-status-desc { font-size: var(--text-sm); color: var(--text-dim); }

/* ---------------------------------------------------------------- shared keyframes
   transform + opacity only. */
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes fade-out { to { opacity: 0; } }
@keyframes rise-in { from { opacity: 0; transform: translateY(var(--enter-y)); } to { opacity: 1; transform: none; } }
@keyframes pop-in { from { opacity: 0; transform: translateY(6px) scale(0.97); } to { opacity: 1; transform: none; } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
@keyframes breathe { 0%, 100% { opacity: 0.55; transform: scale(1); } 50% { opacity: 1; transform: scale(1.06); } }
@keyframes shimmer { from { transform: translateX(-100%); } to { transform: translateX(100%); } }

/* Staggered entrance: motion.js tags cards on page load with .reveal
   and an index --i; each rises in a beat after the previous one. */
.reveal {
  animation: rise-in var(--duration-slow) var(--ease-out) both;
  animation-delay: calc(var(--i, 0) * var(--stagger-step));
}

/* ---------------------------------------------------------------- page transitions
   Native cross-document View Transitions (Chromium 126+, Safari 18.2+):
   the sidebar and topbar are named, so they hold still while only the
   page content crossfades with a short slide. Browsers without support
   just navigate normally - nothing to polyfill. */
@view-transition { navigation: auto; }
.sidebar { view-transition-name: zs-sidebar; }
.topbar { view-transition-name: zs-topbar; }
main.page { view-transition-name: zs-page; }
::view-transition-old(zs-page) { animation: var(--duration-fast) var(--ease-in) both page-out; }
::view-transition-new(zs-page) { animation: var(--duration-slow) var(--ease-out) both page-in; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: var(--duration-base); }
@keyframes page-out { to { opacity: 0; transform: translateY(-4px); } }
@keyframes page-in { from { opacity: 0; transform: translateY(8px); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}