/* ==========================================================================
   shell.css: app frame. Sidebar (brand, live device card, grouped nav,
   privacy note), top bar (title + device cluster + actions), page
   transitions and the footer. Phones get a sticky top bar with a
   scrollable tab strip. All values come from tokens.css.
   ========================================================================== */

.app-shell {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
}

/* ---------------------------------------------------------------- sidebar */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  padding: var(--sp-5) var(--sp-3) var(--sp-4);
  background: var(--panel);
  border-right: 1px solid var(--line-soft);
  overflow-y: auto;
  z-index: var(--z-sticky);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 0 var(--sp-2);
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  box-shadow: var(--shadow-sm);
  flex: none;
}

.brand-title-wrap { display: flex; flex-direction: column; min-width: 0; }
.brand-name { font-size: 15px; font-weight: 650; letter-spacing: var(--tracking-tight); color: var(--text); line-height: 1.25; }
.brand-sub  { font-size: var(--fs-xs); color: var(--muted); line-height: 1.35; }

/* live device card */
.device-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "icon text dot" "meter meter meter";
  align-items: center;
  column-gap: var(--sp-3);
  row-gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-3);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  color: var(--text);
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: border-color var(--t-med) var(--ease-out), box-shadow var(--t-med) var(--ease-out), transform var(--t-fast) var(--ease-out);
}
.device-card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.device-card:active { transform: scale(0.985); }
.device-card:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.device-card-icon {
  grid-area: icon;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--well-dark);
  color: var(--well-text);
}
.device-card-text { grid-area: text; display: flex; flex-direction: column; min-width: 0; }
.device-card-name { font-size: var(--fs-sm); font-weight: 600; line-height: 1.3; }
.device-card-status { font-size: var(--fs-xs); color: var(--muted); line-height: 1.35; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.device-card-dot {
  grid-area: dot;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-strong);
  position: relative;
}
.device-card[data-state="on"]   { border-color: var(--success-border); }
.device-card[data-state="on"]   .device-card-icon { background: var(--ink); color: var(--lime); }
.device-card[data-state="on"]   .device-card-status { color: var(--success-ink); }
.device-card[data-state="on"]   .device-card-dot { background: var(--success); }
.device-card[data-state="on"]   .device-card-dot::after,
.device-card[data-state="wait"] .device-card-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid currentColor;
  color: var(--success-ink);
  animation: dot-ring 2.4s var(--ease-out) infinite;
}
.device-card[data-state="wait"] { border-color: var(--warning-border); }
.device-card[data-state="wait"] .device-card-status { color: var(--warning-ink); }
.device-card[data-state="wait"] .device-card-dot { background: var(--warning); }
.device-card[data-state="wait"] .device-card-dot::after { color: var(--warning); }

.device-card-meter { grid-area: meter; display: flex; align-items: center; gap: var(--sp-2); }
.device-card-meter[hidden] { display: none; }
.meter-track { flex: 1; height: 6px; border-radius: var(--r-pill); background: var(--line-soft); overflow: hidden; }
.meter-fill { display: block; height: 100%; width: 0; border-radius: inherit; background: var(--success); transition: width var(--t-slow) var(--ease-out); }
.meter-fill[data-level="mid"] { background: var(--warning); }
.meter-fill[data-level="low"] { background: var(--danger); }
.meter-text { font: 500 var(--fs-xs)/1 var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

@keyframes dot-ring {
  0%   { opacity: 0.55; transform: scale(0.6); }
  70%  { opacity: 0;    transform: scale(1.6); }
  100% { opacity: 0;    transform: scale(1.6); }
}

/* grouped navigation */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-section {
  padding: var(--sp-4) var(--sp-3) var(--sp-1);
  font-size: var(--fs-2xs);
  font-weight: 600;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--muted);
}
.nav-section:first-child { padding-top: 0; }

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  height: 40px;
  padding: 0 var(--sp-2);
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font: 500 var(--fs-body)/1 var(--font-ui);
  text-align: left;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}

.nav-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex: none;
  color: inherit;
  transition: background var(--t-med) var(--ease-out), color var(--t-med) var(--ease-out), transform var(--t-med) var(--spring);
}
.nav-icon svg { width: 18px; height: 18px; }

.nav-label { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.nav-item:hover { background: var(--panel-2); color: var(--text); }
.nav-item:hover .nav-icon { transform: translateX(1px); }
.nav-item:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }

.nav-item.active {
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 600;
}
.nav-item.active .nav-icon { background: var(--lime); color: var(--on-accent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ink) 12%, transparent); }
.nav-item.active::before {
  content: '';
  position: absolute;
  left: calc(var(--sp-3) * -1);
  top: 9px;
  bottom: 9px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--ink);
  animation: nav-indicator var(--t-med) var(--spring) both;
}
@keyframes nav-indicator { from { transform: scaleY(0.2); opacity: 0; } to { transform: scaleY(1); opacity: 1; } }

/* locked until a keyboard is connected */
.nav-lock {
  display: none;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  place-items: center;
  color: var(--muted);
  background: var(--panel-2);
}
.sidebar-nav.device-disconnected .nav-item.locked-tab .nav-lock { display: grid; }
.sidebar-nav.device-disconnected .nav-item.locked-tab .nav-label,
.sidebar-nav.device-disconnected .nav-item.locked-tab .nav-icon { opacity: 0.55; }
.sidebar-nav.device-disconnected .nav-item.locked-tab:hover { background: var(--panel-2); }

.sidebar-footer { display: flex; flex-direction: column; gap: var(--sp-2); }

.privacy-note {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  padding: var(--sp-3);
  border-radius: var(--r-card);
  background: var(--panel-2);
  font-size: var(--fs-xs);
  line-height: 1.45;
  color: var(--muted);
}
.privacy-note strong { display: block; color: var(--text); font-size: var(--fs-sm); margin-bottom: 1px; }
.privacy-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex: none;
  background: var(--success-soft);
  color: var(--success-ink);
}

/* ------------------------------------------------------------ main + top */
.main-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
}

.top-header {
  position: relative;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  min-height: var(--header-h);
  padding: var(--sp-3) var(--sp-6);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.header-title-area { min-width: 0; display: flex; flex-direction: column; }
.header-eyebrow {
  font-size: var(--fs-2xs);
  font-weight: 600;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--accent-ink);
  line-height: 1.4;
}
.header-title-area h2 { font-size: 19px; font-weight: 600; line-height: 1.3; }
.header-title-area p {
  font-size: var(--fs-sm);
  color: var(--muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-telemetry-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex: none;
}

/* one capsule: status | battery | firmware */
.device-cluster {
  display: flex;
  align-items: stretch;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--panel);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}
.device-cluster > * + *:not([style*="display: none"]) { border-left: 1px solid var(--line-soft); }

.device-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  height: 100%;
  padding: 0 var(--sp-3);
  border: 0;
  background: transparent;
  color: var(--text);
  font: 500 var(--fs-sm)/1 var(--font-ui);
  white-space: nowrap;
}
button.device-pill { cursor: pointer; transition: background var(--t-fast) var(--ease-out); }
button.device-pill:hover { background: var(--panel-2); }
button.device-pill:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; border-radius: var(--r-pill); }

.device-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-strong);
  position: relative;
  flex: none;
}
.device-pill.connected { color: var(--success-ink); }
.device-pill.connected .device-dot { background: var(--success); box-shadow: 0 0 0 3px var(--success-soft); }
.device-pill.warning { color: var(--warning-ink); }
.device-pill.warning .device-dot { background: var(--warning); box-shadow: 0 0 0 3px var(--warning-soft); }
.device-pill.error { color: var(--danger-ink); }
.device-pill.error .device-dot { background: var(--danger); box-shadow: 0 0 0 3px var(--danger-soft); }
.device-pill.busy .device-dot { background: var(--lime); box-shadow: 0 0 0 1px var(--ink); animation: blink 1s ease-in-out infinite; }
.device-pill .status-help { display: inline-flex; color: var(--muted); }

.fw-pill { color: var(--muted); font-size: var(--fs-xs); }
.fw-pill .fw-label { font-weight: 600; letter-spacing: var(--tracking-caps); font-size: var(--fs-2xs); }
.fw-pill #fwVersion { color: var(--text); }

.battery-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-3);
  font: 500 var(--fs-sm)/1 var(--font-mono);
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.battery-shell {
  position: relative;
  width: 22px;
  height: 11px;
  border: 1.5px solid var(--text);
  border-radius: 3px;
  padding: 1px;
}
.battery-shell::after {
  content: '';
  position: absolute;
  right: -4px;
  top: 2.5px;
  width: 2px;
  height: 4px;
  border-radius: 0 1px 1px 0;
  background: var(--text);
}
.battery-fill { height: 100%; border-radius: 1px; background: var(--success); transition: width var(--t-slow) var(--ease-out); }
.charge-icon { color: var(--warning); display: inline-flex; }
.charge-icon svg { width: 14px; height: 14px; }

.btn-guide .btn-guide-label { margin-left: 2px; }

/* save indicator (Saving… / Saved / Couldn't save) */
.save-state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 var(--sp-2);
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--muted);
  transition: opacity var(--t-slow) var(--ease-out);
}
.save-state.is-idle { display: none; }
.save-state .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 1px var(--ink); animation: blink 1s ease-in-out infinite; }
.save-state.is-saved { color: var(--success-ink); background: var(--success-soft); }
.save-state.is-saved svg { animation: pop-in var(--t-med) var(--spring) both; }
.save-state.is-fading { opacity: 0; }
.save-state.is-error { color: var(--danger-ink); background: var(--danger-soft); }
.save-state .retry {
  margin-left: 4px;
  padding: 2px 8px;
  border: 1px solid var(--danger-border);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--danger-ink);
  font: 600 var(--fs-2xs)/1.4 var(--font-ui);
  cursor: pointer;
}

/* small "LIVE" chip used on preview cards */
.live-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--r-pill);
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: var(--fs-2xs);
  font-weight: 600;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
}
.live-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 1px var(--ink);
  animation: blink 1.6s ease-in-out infinite;
}

/* ------------------------------------------------------ content + motion */
.view-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-6) var(--sp-6) var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  scroll-behavior: smooth;
}
.view-container > .tab-pane,
.view-container > .app-footer { width: 100%; max-width: 1360px; margin-inline: auto; }

.tab-pane.is-entering { animation: view-in 300ms var(--ease-out) both; }
@keyframes view-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

/* ---------------------------------------------------------------- footer */
.app-footer {
  margin-top: auto;
  padding: var(--sp-4) 0 var(--sp-2);
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-4);
  font-size: var(--fs-xs);
  color: var(--muted);
}
.app-footer-credit { display: inline-flex; align-items: center; gap: var(--sp-1); }
.app-footer-credit svg { color: var(--danger); width: 14px; height: 14px; }
.app-footer-credit a { color: var(--text); font-weight: 600; text-decoration: none; border-bottom: 1px solid var(--lime); }
.app-footer-credit a:hover { background: var(--accent-soft); }
.app-footer-credit a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: var(--r-xs); }

/* ----------------------------------------------------- tablets & phones */
@media (max-width: 1180px) {
  .header-title-area p { display: none; }
  .btn-guide .btn-guide-label { display: none; }
}

@media (max-width: 860px) {
  html, body { height: auto; min-height: 100dvh; overflow-x: hidden; overflow-y: auto; }
  .app-shell { flex-direction: column; width: 100vw; height: auto; min-height: 100dvh; overflow: visible; }

  .sidebar {
    position: sticky;
    top: 0;
    width: 100%;
    min-width: 0;
    height: auto;
    flex-direction: column;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-4) var(--sp-2);
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
    background: color-mix(in srgb, var(--panel) 92%, transparent);
    backdrop-filter: saturate(1.4) blur(10px);
    overflow: visible;
  }
  .brand-mark { width: 32px; height: 32px; border-radius: 9px; }
  .device-card, .sidebar-footer, .nav-section { display: none; }

  .sidebar-nav {
    flex-direction: row;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .sidebar-nav::-webkit-scrollbar { display: none; }
  .nav-item {
    width: auto;
    flex: none;
    height: 36px;
    padding: 0 var(--sp-3) 0 6px;
    border: 1px solid var(--line);
    border-radius: var(--r-pill);
    background: var(--panel);
    font-size: var(--fs-sm);
  }
  .nav-icon { width: 24px; height: 24px; border-radius: var(--r-pill); }
  .nav-icon svg { width: 16px; height: 16px; }
  .nav-item.active { border-color: var(--ink); }
  .nav-item.active::before { display: none; }
  .nav-lock { display: none !important; }
  .sidebar-nav.device-disconnected .nav-item.locked-tab { display: none; }

  .main-wrapper { height: auto; overflow: visible; }
  .top-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-3);
    padding: var(--sp-4);
    backdrop-filter: none;
    background: var(--bg);
    border-bottom: 0;
  }
  .header-title-area h2 { font-size: var(--fs-h2); }
  .header-telemetry-bar { flex-wrap: wrap; }
  .device-cluster { flex: 1 1 100%; overflow-x: auto; }
  .view-container { padding: 0 var(--sp-4) var(--sp-4); overflow: visible; }
}

@media (max-width: 640px) {
  .app-footer { flex-direction: column; text-align: center; justify-content: center; }
  .header-telemetry-bar .btn-action-secondary,
  .header-telemetry-bar .btn-connect-primary { height: 40px; flex: 1; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .tab-pane.is-entering, .nav-item.active::before { animation: none; }
  .device-card-dot::after { animation: none !important; display: none; }
}