/* Design tokens, dark base theme, typography */

:root {
  /* Background palette */
  --bg: #0D1117;           /* --color-bg-base */
  --bg-secondary: #10131C; /* --color-bg-elevated */
  --bg-tile: #10131C;      /* --color-bg-elevated */
  --bg-header: #0D1117;    /* --color-bg-base (header matches page) */
  --bg-overlay: rgba(13, 17, 23, 0.85); /* brand base with opacity */
  --bg-tile-hover: #1A1F2B; /* --color-bg-surface */
  --bg-surface: #1A1F2B;

  /* Text palette */
  --text: #F0F6FF;         /* --color-text-primary */
  --text-dim: #4A5060;     /* --color-text-disabled */
  --text-muted: #8E95A3;   /* --color-text-secondary */

  /* Borders */
  --border: #2A3040;       /* --color-border-default */
  --border-subtle: #1E2430; /* --color-border-subtle */

  /* Accent */
  --accent: #00D9F5;        /* brand cyan */
  --accent-hover: #00b8d1;  /* slightly darker cyan for hover */
  --accent-dim: rgba(0, 217, 245, 0.15);

  /* Bell / notification */
  --bell: #F1A640;
  --bell-color: #F1A640;    /* brand amber */
  --activity-color: #F1A640;
  --bell-glow: rgba(241, 166, 64, 0.25);
  --bell-border: rgba(241, 166, 64, 0.6);

  /* Status */
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;

  /* Layout */
  --tile-height: 300px;
  --tile-min-width: 360px;
  --grid-gap: 8px;
  --grid-padding: 16px;
  --header-height: 44px;

  /* Transitions */
  --t-zoom: 250ms ease-in-out;
  --t-fast: 150ms ease;
  --t-fade: 200ms ease;

  /* Typography */
  --font-ui: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', monospace;
}

/* Box-sizing reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Base */
html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

/* Utility */
.hidden {
  display: none !important;
}

/* ============================================================
   App layout
   ============================================================ */

.view {
  height: 100vh;
  overflow: hidden;
}

.view--active {
  display: flex;
  flex-direction: column;
}

.view.hidden {
  display: none;
}

/* ============================================================
   App header
   ============================================================ */

.app-header {
  height: var(--header-height);
  padding: 0 var(--grid-padding);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

/* ============================================================
   Session grid
   ============================================================ */

.session-grid {
  flex: 1;
  overflow-y: auto;
  padding: var(--grid-padding);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--tile-min-width), 1fr));
  gap: var(--grid-gap);
  align-content: start;
}

/* ============================================================
   Session tile
   ============================================================ */

.session-tile {
  height: var(--tile-height);
  background: var(--bg-tile);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  overflow: hidden;
  position: relative;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.session-tile:hover,
.session-tile:focus-visible {
  border-color: var(--accent);
}

/* Bell / notification tile */
.session-tile--bell {
  border-color: var(--bell-border);
  box-shadow: 0 0 0 1px var(--bell-border), inset 0 0 12px var(--bell-glow);
}

/* ============================================================
   Tile header
   ============================================================ */

.tile-header {
  height: 32px;
  padding: 0 10px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.tile-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.tile-meta {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  margin-left: 8px;
}

/* Bell notification badge */
.tile-bell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 16px;
  height: 16px;
  padding: 0 3px;
  border-radius: 8px;
  background: var(--bell);
  color: #0D1117;
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
  flex-shrink: 0;
  margin-right: 6px;
  animation: bell-pulse 1.4s ease-in-out infinite;
}

@keyframes bell-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

/* ============================================================
   Tile body
   ============================================================ */

.tile-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.tile-body pre {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.tile-pre {
  position: absolute;
  inset: 0;
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  white-space: pre;
  overflow: hidden;
  margin: 0;
}

/* Fade gradient at bottom of tile body */
.tile-body::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--bg-tile));
  pointer-events: none;
  z-index: 1;
}

/* ============================================================
   Empty state
   ============================================================ */

.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
}

/* ============================================================
   Responsive breakpoints
   ============================================================ */

@media (max-width:1199px) and (min-width:900px) {
  :root {
    --tile-min-width:420px;
  }
}

@media (max-width:899px) and (min-width:600px) {
  .session-grid {
    grid-template-columns:1fr;
    padding:8px;
  }
  .session-tile {
    height:200px;
  }
}

@media (max-width:599px) {
  .session-grid {
    display:flex;
    flex-direction:column;
    gap:1px;
    padding:0;
  }
  .session-tile {
    height:auto;
    border-radius:0;
    border-left:none;
    border-right:none;
  }
}

@media (max-width:599px) and (orientation:landscape) {
  .session-grid {
    padding:0;
  }
}

/* ============================================================
   Expanded view
   ============================================================ */

#view-expanded {
  position: relative;
}

.expanded-header {
  height: var(--header-height);
  padding: 0 12px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.back-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 18px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.expanded-session-name {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.palette-trigger {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 12px;
  padding: 4px 10px;
  cursor: pointer;
}

.view-body {
  display: flex;
  flex-direction: row;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* ============================================================
   Session sidebar
   ============================================================ */

.session-sidebar {
  width: 200px;
  min-width: 200px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  transition: width 0.25s ease, min-width 0.25s ease;
}

.session-sidebar.sidebar--collapsed {
  width: 0;
  min-width: 0;
}

.sidebar-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.sidebar-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-collapse-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 18px;
  padding: 2px 6px;
  border-radius: 4px;
}

.sidebar-collapse-btn:hover {
  color: var(--text);
}

.sidebar-toggle-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  cursor: pointer;
  color: var(--text-muted);
}

.sidebar-toggle-btn:hover {
  border-color: var(--accent);
}

/* ============================================================
   Sidebar session card styles
   ============================================================ */

.sidebar-item {
  height: 120px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.sidebar-item:hover {
  background: var(--bg-surface);
}

.sidebar-item--active {
  background: var(--bg-surface);
  border-left: 3px solid var(--accent);
}

.sidebar-item-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  padding: 8px 8px 4px;
  height: 32px;
  gap: 4px;
  align-items: center;
  flex-shrink: 0;
}

.sidebar-item-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.sidebar-item-body {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.sidebar-item-body pre {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 10px;
  line-height: 1.4;
  color: var(--text-muted);
  white-space: pre;
  padding: 0 8px 6px;
  margin: 0;
}

.sidebar-empty {
  padding: 16px 12px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

.terminal-container {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  background: #000;
  padding: 0 4px;  /* keep text off the side edges */
}

/* xterm.js injects overflow-y: scroll on .xterm-viewport — override it */
.xterm .xterm-viewport {
  overflow-y: hidden !important;
}

.reconnect-overlay {
  position: absolute;
  inset: var(--header-height) 0 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

/* ============================================================
   Zoom-in-place expand/collapse transition
   ============================================================ */

.session-tile--expanding {
  position: fixed;
  z-index: 50;
  border-radius: 4px;
  transition:
    top var(--t-zoom),
    left var(--t-zoom),
    width var(--t-zoom),
    height var(--t-zoom),
    border-radius var(--t-zoom);
}

.session-tile--expanded {
  top: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  border-radius: 0;
}

.session-grid--dimming .session-tile:not(.session-tile--expanding) {
  opacity: 0;
  transition: opacity var(--t-fade);
}

/* ============================================================
   Bell count badge
   ============================================================ */

.tile-bell-count {
  font-size: 10px;
  font-weight: 600;
  color: var(--bell);
  min-width: 16px;
  text-align: right;
}

/* ============================================================
   Connection status indicator states
   ============================================================ */

.connection-status--ok {
  color: var(--ok);
}

.connection-status--warn {
  color: var(--warn);
}

.connection-status--err {
  color: var(--err);
}

/* ============================================================
   Toast notification
   ============================================================ */

.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-header);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-muted);
  z-index: 100;
  pointer-events: none;
  animation: toast-in var(--t-fast) ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ============================================================
   Mobile three-tier priority list (bell / active / idle)
   ============================================================ */

@media (max-width:599px) {
  /* Tier 1 — bell: expanded preview (~126px total) */
  .session-tile--tier-bell .tile-body {
    height: 90px;
  }
  .session-tile--tier-bell {
    min-height: 126px;
  }

  /* Tier 2 — active: single-line preview (~60px total) */
  .session-tile--tier-active .tile-body {
    height: 24px;
  }
  .session-tile--tier-active {
    min-height: 60px;
  }
  .session-tile--tier-active .tile-pre {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Tier 3 — idle: name-only (~44px total) */
  .session-tile--tier-idle .tile-body {
    display: none;
  }
  .session-tile--tier-idle {
    min-height: 44px;
  }
  .session-tile--tier-idle .tile-header {
    height: 44px;
  }
  .session-tile--tier-idle .tile-name {
    color: var(--text-dim);
  }
}

/* ============================================================
   Command palette overlay (desktop session switching)
   ============================================================ */

.command-palette {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
}

.command-palette__backdrop {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(2px);
}

.command-palette__dialog {
  position: relative;
  width: min(440px, 90vw);
  background: var(--bg-header);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

.command-palette__input {
  width: 100%;
  padding: 14px 16px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  font-family: var(--font-ui);
  outline: none;
}

.command-palette__input::placeholder {
  color: var(--text-dim);
}

.command-palette__list {
  list-style: none;
  max-height: 320px;
  overflow-y: auto;
}

.palette-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-muted);
  transition: background var(--t-fast);
}

.palette-item:hover,
.palette-item--selected {
  background: var(--accent-dim);
  color: var(--text);
}

.palette-item__index {
  font-size: 11px;
  color: var(--text-dim);
  width: 16px;
}

.palette-item__name {
  flex: 1;
}

.palette-item__bell {
  color: var(--bell);
  font-size: 11px;
}

.palette-item__time {
  font-size: 11px;
  color: var(--text-dim);
}

/* ─── Mobile Bottom Sheet ─────────────────────────────────────── */

.bottom-sheet {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-end;
}

.bottom-sheet__backdrop {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
}

.bottom-sheet__panel {
  position: relative;
  width: 100%;
  background: var(--bg-header);
  border-top: 1px solid var(--border);
  border-radius: 12px 12px 0 0;
  max-height: 70vh;
  overflow-y: auto;
  animation: sheet-up var(--t-zoom) ease;
}

@keyframes sheet-up {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.bottom-sheet__handle {
  width: 36px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin: 10px auto 6px;
}

.bottom-sheet__list {
  list-style: none;
  padding-bottom: 8px;
}

.sheet-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
  height: 56px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--t-fast);
}

.sheet-item:hover {
  background: var(--accent-dim);
}

.sheet-item__name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sheet-item__bell {
  color: var(--bell);
}

.sheet-item__time {
  font-size: 12px;
  color: var(--text-dim);
}

/* ─── Floating Session Pill ───────────────────────────────────── */

.session-pill {
  position: fixed;
  bottom: 24px;
  right: 16px;
  z-index: 50;
  background: var(--bg-header);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0.75;
}

.session-pill:hover {
  opacity: 1;
  border-color: var(--accent);
  color: var(--text);
}

.session-pill__label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 140px;
}

.session-pill__bell {
  color: var(--bell);
}

/* ─── Reduced Motion ──────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .tile-bell {
    animation: none;
  }

  .session-tile--expanding {
    transition: none;
  }

  .session-grid--dimming .session-tile:not(.session-tile--expanding) {
    transition: none;
  }

  .bottom-sheet__panel {
    animation: none;
  }

  .toast {
    animation: none;
  }

  .session-sidebar {
    transition: none;
  }
}

/* ============================================================
   App wordmark
   ============================================================ */

.app-wordmark {
  margin: 0;
  line-height: 1;
  display: flex;
  align-items: center;
}
.app-wordmark img {
  height: 24px;
  width: auto;
  display: block;
}

/* ============================================================
   Responsive overlay sidebar at <960px
   ============================================================ */

@media (max-width: 959px) {
  .session-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    z-index: 200;
    width: 240px;
    min-width: 240px;
    transition: transform 0.25s ease;
    transform: translateX(0);
    box-shadow: 2px 0 16px rgba(0,0,0,0.5);
  }

  .session-sidebar.sidebar--collapsed {
    width: 240px;
    min-width: 240px;
    transform: translateX(-100%);
  }

  .sidebar-collapse-btn {
    display: none;
  }
}