/* OpenSquilla Web UI — Channels view.
   Editorial spec-sheet read: hairline grid, mono numerals, accent only on
   status flips and the chiseled left edge of an active card. */

.ch-stage [hidden] { display: none !important; }

/* ─── Stage container ────────────────────────────────────────────────── */

.ch-stage {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  max-width: none;
  position: relative;
}

/* ─── Header ─────────────────────────────────────────────────────────── */

.ch-stage__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
  padding-top: var(--sp-3);
  position: relative;
}
.ch-stage__title-block {
  display: flex; flex-direction: column; gap: 6px; min-width: 0;
  position: relative;
  padding-left: 18px;
}
/* Editorial corner-bracket on the title block — a quiet brutalist mark. */
.ch-stage__title-block::before {
  content: "";
  position: absolute;
  left: 0; top: 4px; bottom: 28px;
  width: 10px;
  border-left: 1px solid var(--accent);
  border-top: 1px solid var(--accent);
  opacity: 0.85;
}
.ch-stage__eyebrow {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.ch-stage__title {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 700;
  letter-spacing: 0;
  line-height: var(--lh-display);
  position: relative;
  font-feature-settings: "ss01", "cv11";
}
.ch-stage__title::after {
  content: "";
  position: absolute; left: 0; bottom: -10px;
  width: 44px; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  border-radius: 2px;
}
.ch-stage__subtitle {
  font-size: var(--fs-sm); color: var(--text-muted);
  margin-top: var(--sp-4);
  max-width: 62ch;
  line-height: 1.55;
}
.ch-stage__actions { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }

.ch-neg { color: var(--danger); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ─── List section ───────────────────────────────────────────────────── */

.ch-list {
  position: relative;
}
.ch-list__head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: var(--sp-4); gap: var(--sp-3);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--hairline);
}
.ch-list__title {
  font-size: var(--fs-lg); font-weight: 700;
  letter-spacing: 0;
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
}
.ch-list__count {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 26px; height: 22px; padding: 0 8px;
  border-radius: 4px;
  font-size: 11px; font-weight: 700;
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.ch-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--sp-4);
}

/* ─── Card — chiseled spec sheet ─────────────────────────────────────── */

.ch-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-4) var(--sp-4) var(--sp-4) calc(var(--sp-4) + 4px);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    transform 220ms var(--ease-press);
  animation: ch-fade-up 380ms var(--ease-press) both;
  animation-delay: calc(40ms * var(--i, 0));
  position: relative;
  overflow: hidden;
}
/* Left-edge chisel — a 3px accent rail anchored on the inside, dim by default,
   lights up on hover. Reads like an instrument bezel. */
.ch-card::before {
  content: "";
  position: absolute;
  left: 0; top: 14px; bottom: 14px;
  width: 3px;
  background: var(--border);
  border-radius: 0 2px 2px 0;
  transition: background 220ms var(--ease-press), top 220ms var(--ease-press), bottom 220ms var(--ease-press);
}
/* Top-right tick — micro corner mark gives each card a "filed" feel. */
.ch-card::after {
  content: "";
  position: absolute;
  top: 10px; right: 10px;
  width: 8px; height: 8px;
  border-top: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
  pointer-events: none;
}
.ch-card:hover {
  border-color: var(--border-strong);
  box-shadow:
    0 1px 0 0 color-mix(in srgb, var(--accent) 18%, transparent) inset,
    0 24px 60px -32px rgba(0,0,0,0.7);
  transform: translateY(-2px);
}
.ch-card:hover::before {
  background: var(--accent);
  top: 8px; bottom: 8px;
  box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 60%, transparent);
}
.ch-card__head {
  display: flex; align-items: center; gap: 10px; min-width: 0;
}
.ch-card__name {
  font-weight: 700; font-size: var(--fs-md); flex: 1;
  letter-spacing: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  min-width: 0;
  font-family: var(--font-display);
}
.ch-card__status {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ch-card__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px 18px; margin: 0;
  padding-top: var(--sp-3);
  border-top: 1px dashed var(--border);
  position: relative;
}
.ch-card__meta > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.ch-card__meta dt {
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  font-family: var(--font-mono);
}
.ch-card__meta dd {
  margin: 0;
  font-size: var(--fs-sm);
  max-width: 100%;
  min-width: 0;
  color: var(--text);
  white-space: normal;
  overflow: hidden;
  overflow-wrap: anywhere;
  text-overflow: clip;
  font-weight: 500;
}
.ch-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: var(--track-tabular);
}

.ch-card__config { font-size: var(--fs-xs); }
.ch-card__config summary {
  cursor: pointer;
  color: var(--text-muted);
  user-select: none;
  min-height: 38px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 6px 0;
  transition: color var(--transition);
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.ch-card__config summary::before {
  content: "+";
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  width: 14px;
  text-align: center;
  color: var(--accent);
  transition: transform 200ms var(--ease-press);
}
.ch-card__config[open] summary::before { content: "−"; }
.ch-card__config summary:hover { color: var(--accent); }
.ch-card__config-pre {
  margin-top: var(--sp-2);
  padding: var(--sp-3);
  background:
    linear-gradient(180deg, transparent 0%, color-mix(in srgb, var(--bg) 96%, transparent) 100%),
    var(--bg);
  border: 1px solid var(--border);
  border-left: 2px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  border-radius: var(--radius-md);
  overflow: auto;
  max-height: 220px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.55;
  color: var(--text-muted);
}
.ch-card__footnote {
  margin-top: auto;
  padding-top: var(--sp-3);
  border-top: 1px dashed var(--border);
  font-size: var(--fs-xs);
  color: var(--text-dim);
  line-height: 1.55;
  font-style: italic;
}

/* ─── Empty state — graph-paper backdrop ─────────────────────────────── */

.ch-empty {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--sp-8) + var(--sp-2)) var(--sp-4);
  text-align: center;
  background:
    radial-gradient(80% 60% at 50% 0%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 70%),
    repeating-linear-gradient(0deg, transparent 0 23px, var(--hairline) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, var(--hairline) 23px 24px),
    var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}
/* Crosshair accents at the four corners — instrument fiducial marks. */
.ch-empty::before,
.ch-empty::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--accent);
  opacity: 0.5;
}
.ch-empty::before {
  top: 12px; left: 12px;
  border-right: 0; border-bottom: 0;
}
.ch-empty::after {
  bottom: 12px; right: 12px;
  border-left: 0; border-top: 0;
}
.ch-empty__art {
  width: 120px; height: 120px;
  color: var(--text-muted);
  line-height: 1;
  margin-bottom: var(--sp-4);
  filter: drop-shadow(0 0 24px color-mix(in srgb, var(--accent) 18%, transparent));
}
.ch-empty__art svg { display: block; width: 100%; height: 100%; }
.ch-empty__title {
  font-family: var(--font-display);
  font-size: 1.625rem; font-weight: 800;
  letter-spacing: 0;
  color: var(--text);
  margin-bottom: 10px;
}
.ch-empty__msg {
  width: 100%;
  max-width: 56ch;
  box-sizing: border-box;
  color: var(--text-muted);
  font-size: var(--fs-sm);
  line-height: 1.6;
  margin-bottom: var(--sp-4);
  overflow-wrap: anywhere;
}
.ch-empty__actions {
  display: flex;
  justify-content: center;
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}
.ch-empty__code {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-elevated));
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
  padding: 6px 14px;
  border-radius: var(--radius-md);
  letter-spacing: 0.02em;
  font-variant-ligatures: none;
}

/* ─── Animations ─────────────────────────────────────────────────────── */

@keyframes ch-fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
    filter: blur(2px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .ch-card { animation: none !important; }
  .ch-card:hover { transform: none; }
}

/* ─── Responsive ─────────────────────────────────────────────────────── */

@media (max-width: 720px) {
  .ch-stage__header { flex-direction: column; align-items: stretch; }
  .ch-stage__actions { width: 100%; }
  .ch-cards { grid-template-columns: 1fr; }
  .ch-card__head { align-items: flex-start; flex-wrap: wrap; }
  .ch-card__name {
    flex: 1 1 180px;
    max-width: 100%;
    white-space: normal;
    overflow-wrap: anywhere;
    text-overflow: clip;
  }
  .ch-card__head .chip {
    max-width: 100%;
    min-width: 0;
    white-space: normal;
    overflow-wrap: anywhere;
  }
  .ch-stage__title-block { padding-left: 14px; }
  .ch-stage__title-block::before {
    bottom: auto;
    height: 16px;
  }
}