/* =============================================================================
   layout.css — page frame: sidebar, shell, topbar, section grids, responsive.
   ========================================================================== */

/* Sidebar ------------------------------------------------------------------- */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: var(--z-sidebar);
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  padding: var(--sp-7) var(--sp-5);
  border-right: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--plane) 88%, transparent);
  backdrop-filter: var(--glass-blur);
  transition: transform var(--dur-2) var(--ease-out);
}

.sidebar__brand { display: block; padding: var(--sp-1) var(--sp-2) var(--sp-8); }
.sidebar__brand img { width: 190px; }
:root[data-theme="light"] .sidebar__brand img,
:root[data-theme="light"] .site-foot img { filter: invert(1) hue-rotate(180deg); }

.sidebar__nav { display: grid; gap: var(--sp-1); }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  color: var(--ink-2);
  font-size: var(--fs-md);
  font-weight: 600;
  transition: color var(--dur-1) var(--ease-out), background var(--dur-1) var(--ease-out);
}
.nav-link .icon { width: 18px; height: 18px; }
.nav-link:hover { color: var(--ink-1); background: var(--surface-hover); }
.nav-link.is-active {
  color: var(--ink-1);
  background: linear-gradient(90deg, var(--accent-soft), transparent);
}
.nav-link.is-active::before {
  content: "";
  position: absolute;
  left: calc(var(--sp-5) * -1);
  width: 3px;
  height: 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(var(--accent), var(--accent-2));
}

.sidebar__foot { margin-top: auto; display: grid; gap: var(--sp-3); }

.dataset-card {
  padding: var(--sp-4);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
}
.dataset-card__head { display: flex; align-items: center; gap: var(--sp-2); }
.dataset-card__head strong { font-size: var(--fs-sm); }
.dataset-card__stats { display: grid; gap: var(--sp-2); margin-top: var(--sp-3); }
.dataset-card__stats > div { display: flex; justify-content: space-between; gap: var(--sp-2); }
.dataset-card__stats dt { font-size: var(--fs-2xs); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.08em; }
.dataset-card__stats dd { font-size: var(--fs-xs); font-weight: 700; font-variant-numeric: tabular-nums; text-align: right; }

.signal { display: flex; align-items: flex-end; gap: 2px; height: 14px; }
.signal i {
  display: block;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--status-good);
  animation: signal-pulse 1.3s var(--ease-in-out) infinite;
}
.signal i:nth-child(1) { height: 6px; }
.signal i:nth-child(2) { height: 10px; animation-delay: 0.18s; }
.signal i:nth-child(3) { height: 14px; animation-delay: 0.36s; }
@keyframes signal-pulse { 50% { opacity: 0.28; transform: scaleY(0.6); } }

.sidebar__version { font-size: var(--fs-3xs); color: var(--ink-3); text-align: center; }

.sidebar-scrim {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-sidebar) - 1);
  background: rgba(4, 6, 12, 0.6);
  backdrop-filter: blur(2px);
}

/* Shell + topbar ------------------------------------------------------------ */
.shell { margin-left: var(--sidebar-w); position: relative; z-index: var(--z-content); }
.shell--bare { margin-left: 0; }

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: 0 clamp(var(--sp-5), 3vw, var(--sp-12));
  border-bottom: 1px solid var(--hairline);
  background: color-mix(in srgb, var(--plane) 78%, transparent);
  backdrop-filter: var(--glass-blur);
}
.topbar__left, .topbar__right { display: flex; align-items: center; gap: var(--sp-3); }
.topbar__title { display: grid; }
.topbar__crumb { font-size: var(--fs-2xs); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.12em; }
.topbar__title strong { font-size: var(--fs-md); }
/* Specific enough to beat .icon-btn's own display value. */
.topbar .topbar__menu { display: none; }

/* Content -------------------------------------------------------------------- */
.content {
  width: min(var(--content-max), 100% - clamp(var(--sp-5), 4vw, var(--sp-12)));
  margin-inline: auto;
  padding: var(--sp-8) 0 var(--sp-16);
  display: grid;
  gap: var(--sp-6);
}

/* Hero ------------------------------------------------------------------------ */
.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  align-items: center;
  gap: var(--sp-12);
  padding: clamp(var(--sp-8), 4vw, var(--sp-14)) clamp(var(--sp-6), 4.5vw, var(--sp-16));
  border: 1px solid var(--hairline);
  border-radius: var(--radius-2xl);
  background: var(--panel-bg);
  box-shadow: var(--shadow-3);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.45;
  mask-image: linear-gradient(105deg, #000, transparent 78%);
}
.hero__copy { position: relative; display: grid; gap: var(--sp-5); justify-items: start; }
.hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  line-height: var(--lh-tight);
  letter-spacing: -0.04em;
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--violet-300), var(--accent-2) 78%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
:root[data-theme="light"] .hero__title em {
  background: linear-gradient(100deg, var(--violet-600), var(--cyan-600) 78%);
  -webkit-background-clip: text;
  background-clip: text;
}
.hero__lede { max-width: 62ch; color: var(--ink-2); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.hero__hint { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-xs); color: var(--ink-3); }

.hero__stats { display: flex; flex-wrap: wrap; gap: var(--sp-8); margin-top: var(--sp-2); }
.hero__stats > div { display: grid; gap: var(--sp-1); }
.hero__stats dt { font-size: var(--fs-2xs); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.1em; }
.hero__stats dd { font-size: var(--fs-xl); font-weight: 800; }

/* Section grids ---------------------------------------------------------------- */
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--sp-4); }
.analytics { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4); }
.panel--wide { grid-column: 1 / -1; }
.maintenance { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr); gap: var(--sp-4); }

.site-foot {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--sp-6);
  padding-top: var(--sp-8);
  border-top: 1px solid var(--hairline);
  color: var(--ink-3);
  font-size: var(--fs-xs);
}
.site-foot img { width: 150px; }
.site-foot p { text-align: center; }

.error-page { max-width: 60ch; gap: var(--sp-5); justify-items: start; padding-top: var(--sp-16); }

/* Responsive ------------------------------------------------------------------- */
@media (max-width: 1280px) {
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .maintenance { grid-template-columns: 1fr; }
}

@media (max-width: 1024px) {
  :root { --sidebar-w: 0px; }
  .sidebar { width: 268px; transform: translateX(-100%); }
  .sidebar.is-open { transform: none; box-shadow: var(--shadow-3); }
  .nav-link.is-active::before { left: calc(var(--sp-5) * -1); }
  .shell { margin-left: 0; }
  .topbar .topbar__menu { display: inline-grid; }
  .hero { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .content { padding-top: var(--sp-5); gap: var(--sp-5); }
  .analytics { grid-template-columns: 1fr; }
  .panel--wide { grid-column: auto; }
  .topbar__crumb { display: none; }
  .hero__stats { gap: var(--sp-6); }
  .site-foot { grid-template-columns: 1fr; justify-items: center; text-align: center; }
}

@media (max-width: 560px) {
  :root { --topbar-h: 64px; }
  .kpis { grid-template-columns: 1fr; }
  .hero__actions { display: grid; width: 100%; }
  .hero__title { font-size: 2.4rem; }
  .topbar { padding: 0 var(--sp-4); gap: var(--sp-2); }
  .topbar__title strong { font-size: var(--fs-sm); }
}