/* Application shell: fixed top bar, collapsible side rail, scrolling content. */

/* ── Top bar ──────────────────────────────────────────────────────────────── */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  height: var(--topbar-h);
  padding: 0 var(--sp-3);
  background: var(--surface-card);
  border-bottom: 1px solid var(--border);
}

.topbar__left,
.topbar__right { display: flex; align-items: center; gap: var(--sp-3); min-width: 0; }

.brand { display: flex; align-items: center; gap: var(--sp-2); }
.brand__mark {
  display: grid;
  place-items: center;
  width: 24px; height: 24px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--text-inverse);
}
.brand__mark svg { width: 16px; height: 16px; }
.brand__name {
  font-size: var(--fs-16);
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.tariff-chip {
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
  max-width: 320px;
  height: 26px;
  padding: 0 var(--sp-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-sunken);
  white-space: nowrap;
}
.tariff-chip__label {
  font-size: var(--fs-11);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.tariff-chip__value {
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--text-secondary);
  text-overflow: ellipsis;
}

.region-switch {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  height: 26px;
  padding: 0 var(--sp-2) 0 var(--sp-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-sunken);
  white-space: nowrap;
}
.region-switch__label {
  font-size: var(--fs-11);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.region-switch select {
  height: 24px;
  max-width: 220px;
  padding: 0 var(--sp-4) 0 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: var(--fs-12);
  cursor: pointer;
}
.region-switch select:focus-visible {
  outline: none;
  box-shadow: none;
}
.region-switch select:disabled { color: var(--text-muted); }

.topbar__date {
  font-size: var(--fs-13);
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ── Side navigation ──────────────────────────────────────────────────────── */
.shell { display: flex; padding-top: var(--topbar-h); min-height: 100%; }

.sidenav {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  z-index: 15;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: var(--sidenav-w);
  padding: var(--sp-2) 0;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--surface-card);
  border-right: 1px solid var(--border);
  transition: width 0.15s ease;
}

.navlist { display: flex; flex-direction: column; gap: 1px; }

.navlink {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: 36px;
  padding: 0 var(--sp-5) 0 var(--sp-4);
  border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  color: var(--text-secondary);
  font-size: var(--fs-13);
  font-weight: 500;
  white-space: nowrap;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.navlink:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.navlink__icon { flex: 0 0 auto; width: 18px; height: 18px; }
.navlink[aria-current="page"] {
  background: var(--surface-active);
  color: var(--text-accent);
  font-weight: 600;
}

.sidenav__footer { padding: var(--sp-4) var(--sp-4) var(--sp-2); }

/* Collapsed rail: icons only. */
body.nav-collapsed .sidenav { width: var(--sidenav-w-collapsed); }
body.nav-collapsed .navlink__text,
body.nav-collapsed .sidenav__footer { display: none; }
body.nav-collapsed .navlink { padding-right: 0; border-radius: 0; justify-content: flex-start; }
body.nav-collapsed .content { margin-left: var(--sidenav-w-collapsed); }

/* ── Content ──────────────────────────────────────────────────────────────── */
.content {
  flex: 1 1 auto;
  min-width: 0;
  margin-left: var(--sidenav-w);
  padding: var(--sp-5) var(--sp-6) var(--sp-8);
  transition: margin-left 0.15s ease;
}

.view { display: flex; flex-direction: column; gap: var(--sp-5); max-width: 1600px; }
.view[hidden] { display: none; }

.page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.page-title {
  font-size: var(--fs-22);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.page-sub { margin-top: 2px; font-size: var(--fs-13); color: var(--text-secondary); }

.date-nav { display: flex; align-items: center; gap: var(--sp-2); }
.date-picker { display: flex; }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .content { padding: var(--sp-4); }
  .tariff-chip { max-width: 200px; }
}

/* Below this width the rail becomes an overlay drawer, collapsed by default. */
@media (max-width: 840px) {
  .sidenav {
    width: var(--sidenav-w);
    box-shadow: var(--shadow-pop);
    transform: translateX(-100%);
    transition: transform 0.15s ease;
  }
  .content, body.nav-collapsed .content { margin-left: 0; }
  body.nav-open .sidenav { transform: translateX(0); }
  body.nav-collapsed .sidenav { width: var(--sidenav-w); }
  body.nav-collapsed .navlink__text,
  body.nav-collapsed .sidenav__footer { display: revert; }
  body.nav-collapsed .navlink { padding-right: var(--sp-5); border-radius: 0 var(--radius-pill) var(--radius-pill) 0; }

  .nav-scrim {
    position: fixed;
    inset: var(--topbar-h) 0 0 0;
    z-index: 14;
    background: rgba(32, 33, 36, 0.4);
    border: 0;
    padding: 0;
  }

  .topbar__date { display: none; }
  .region-switch__label { display: none; }
  .region-switch select { max-width: 148px; }
  .page-head { align-items: stretch; flex-direction: column; }
}

@media (max-width: 560px) {
  .tariff-chip { display: none; }
  .region-switch { padding-left: var(--sp-2); }
  .region-switch select { max-width: 128px; }
  .btn--icon-text span { display: none; }
  .btn--icon-text { width: 32px; padding: 0; justify-content: center; }
}