/* ============================================================
   Layout — top bar, sidebar rail, dashboard grid
   ============================================================ */
.app {
  display: grid;
  grid-template-columns: 300px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "topbar topbar"
    "rail   main";
  min-height: 100vh;
}

/* Top bar */
.topbar {
  grid-area: topbar;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-6);
  background: var(--surface);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border);
}
.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: 600;
  font-size: 17px;
  white-space: nowrap;
}
.topbar__logo {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #5ac8fa);
  display: grid; place-items: center;
  color: #fff; font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.topbar__dataset {
  font-size: 12px;
  color: var(--text-2);
  padding: 4px 10px;
  border-radius: var(--r-pill);
  background: var(--surface-2);
  border: 1px solid var(--border);
  max-width: 240px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.topbar__spacer { flex: 1; }
.topbar__actions { display: flex; align-items: center; gap: var(--sp-2); }

/* Filter rail */
.rail {
  grid-area: rail;
  position: sticky;
  top: 57px;
  align-self: start;
  height: calc(100vh - 57px);
  overflow-y: auto;
  padding: var(--sp-5);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

/* Main content */
.main {
  grid-area: main;
  padding: var(--sp-6) var(--sp-6) var(--sp-12);
  min-width: 0;
}
.section { margin-bottom: var(--sp-8); }
.section__head {
  display: flex; align-items: baseline; gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}
.section__head h2 { font-size: 20px; }
.section__head .hint { font-size: 13px; color: var(--text-2); }

/* KPI grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-4);
}

/* Chart grid */
.chart-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--sp-4);
}
.col-12 { grid-column: span 12; }
.col-8 { grid-column: span 8; }
.col-6 { grid-column: span 6; }
.col-4 { grid-column: span 4; }

@media (max-width: 1100px) {
  .col-8, .col-6, .col-4 { grid-column: span 12; }
}

/* Responsive: collapse rail */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }
  .rail {
    position: fixed;
    top: 57px; left: 0;
    width: 300px;
    max-width: 85vw;
    height: calc(100vh - 57px);
    background: var(--surface-solid);
    z-index: 60;
    transform: translateX(-105%);
    transition: transform var(--dur-mid) var(--ease-spring);
    box-shadow: var(--shadow-lg);
  }
  .rail.is-open { transform: translateX(0); }
  .rail-backdrop {
    position: fixed; inset: 57px 0 0 0; z-index: 55;
    background: rgba(0,0,0,0.3);
    opacity: 0; pointer-events: none;
    transition: opacity var(--dur-mid) var(--ease-out);
  }
  .rail-backdrop.is-open { opacity: 1; pointer-events: auto; }
}
@media (min-width: 901px) {
  .rail-toggle { display: none; }
}

/* Prevent horizontal overflow on small screens */
html, body { overflow-x: hidden; }
.main { min-width: 0; max-width: 100%; }

@media (max-width: 720px) {
  .topbar { flex-wrap: wrap; row-gap: var(--sp-2); padding: var(--sp-3) var(--sp-4); }
  .topbar__dataset { max-width: 140px; }
  .search-wrap { order: 5; flex: 1 1 100%; }
  .search-wrap .input--search { width: 100% !important; }
  .main { padding: var(--sp-4) var(--sp-4) var(--sp-10); }
}

@media (max-width: 560px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .kpi__value { font-size: 24px; }
  /* hide non-essential top-bar text buttons; keep icons */
  #reset-data-btn { display: none !important; }
  /* toolbar: fields stack cleanly and Clear spans full width */
  .txbar__field { flex: 1 1 44%; }
  .txbar__spacer { display: none; }
  .txbar .btn { flex: 1 1 100%; justify-content: center; }
}