/* ================ CSS VARIABLES ================ */
:root {
  --square-size: 60px;
  --gap: 8px;
  --v-gap: 24px;
  --warehouse-height: 200px;
}

/* ================ GLOBAL & LAYOUT ================ */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  font-family: Arial, sans-serif;
}
h1 {
  text-align: center;
  margin-bottom: 1rem;
}

/* ================ BINS HEADER & NAV BUTTONS ================ */
.main-header {
  background-color: #232F3E;
  display: flex;
  align-items: center;
  padding: 0.5rem 2rem;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
}
.logo {
  height: 40px;
  margin-right: 1rem;
}
.header-title {
  color: #fff;
  font-size: 1.2rem;
  font-weight: bold;
  margin-right: auto;
}
.nav-btn {
  background-color: #FF9900;
  color: #111;
  border: none;
  border-radius: 5px;
  padding: 0.5rem 1rem;
  margin-left: 0.5rem;
  cursor: pointer;
  font-weight: bold;
}
.nav-btn:hover {
  background-color: #e48f00;
}

/* ================ PAGE CONTAINER ================ */
/* full-height container under header, using flex for trends page */
.page-container {
  margin-top: 70px;                  /* offset header */
  display: flex;
  flex-direction: column;
  width: 100%;
  height: calc(100vh - 70px);
  box-sizing: border-box;
  background: #fff;
  padding: 1rem;
}

/* ================ FORM STYLES ================ */
.form-input {
  width: 80%;
  max-width: 400px;
  margin: 1rem auto;
  display: block;
  padding: 1rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}
.big-button {
  background-color: #28a745;
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  margin: 1rem auto;
  display: block;
}
.big-button:hover {
  background-color: #218838;
}
fieldset {
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}
legend {
  font-weight: bold;
}

/* ================ TRENDS PAGE SPECIFIC ================ */
/* Controls area stays at top */
#trend-controls {
  flex: 0 0 auto;
}
/* Chart container fills all remaining height */
.chart-container {
  flex: 1 1 auto;
  width: 100%;
  position: relative;
}
.chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}

/* ================ HEATMAP STYLES ================= */
/* (unchanged from before) */
.heatmap-wrapper {
  width: 100%;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}
.diagram-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--v-gap);
}
.dock-row {
  display: flex;
  gap: var(--gap);
}
.dock-square {
  width: var(--square-size);
  height: var(--square-size);
  background: #ddd;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #333;
  cursor: pointer;
  user-select: none;
}
.warehouse {
  width: calc((var(--square-size) * 83) + (var(--gap) * 82));
  height: var(--warehouse-height);
  background: #ccc;
  border-radius: 6px;
}
.tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 8px;
  border-radius: 4px;
  font-size: 0.9rem;
  line-height: 1.2;
  display: none;
  z-index: 2000;
}

/* ================ UTILITY ================= */
.hidden {
  display: none;
}