/* styles.css */
:root {
  color: #111;
  background: #f4f6fb;
  font-family: Segoe UI, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  background: linear-gradient(135deg, #f8fbff, #eef3ff);
  min-height: 100vh;
  margin: 0;
  padding: 24px;
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

.meta {
  color: #444;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 4px;
  font-size: .95rem;
}

main.layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.building-shell {
  display: flex;
  --floor-height: 60px;
  background: #fff;
  border-radius: 16px;
  gap: 24px;
  padding: 16px;
  box-shadow: 0 15px 35px #0f235f1f;
}

#floor-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 180px;
}

.floor-row {
  display: flex;
  background: #eef2ff;
  border: 1px solid #d7ddfb;
  border-radius: 10px;
  justify-content: space-between;
  align-items:  center;
  padding: 8px 12px;
  transition: background .3s, transform .3s;
}

.floor-row.arriving {
  background: #c8f7dc;
  transform: scale(1.01);
}

.floor-label {
  font-weight: 600;
}

.floor-buttons {
  display: flex;
  gap: 8px;
}

.call-button {
  color: #fff;
  cursor: pointer;
  background: #4c6ef5;
  border: none;
  border-radius: 50%;
  width: 38px;
  height: 38px;
  transition: transform .2s, background .2s;
  font-size: 1.2rem;
}

.call-button.down {
  background: #ff7b54;
}

.call-button:hover:not(:disabled) {
  transform: translateY(-2px);
}

.call-button:disabled {
  opacity: .4;
  cursor: not-allowed;
}

.call-button.pending {
  box-shadow: 0 0 0 3px #4c6ef540;
}

#shaft-stack {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  flex: 1;
  align-items:  end;
  gap: 16px;
}

.elevator-shaft {
  position: relative;
  height: calc(var(--floor-height) * var(--floors, 10));
  background: repeating-linear-gradient(to top, #fff9, #fff9 1px, transparent 1px, transparent calc(var(--floor-height))), #dee8ff80;
  border: 2px solid #dbe0ff;
  border-radius: 12px;
  padding: 8px;
}

.elevator-car {
  position: absolute;
  height: calc(var(--floor-height)  - 12px);
  display: flex;
  color: #fff;
  background: linear-gradient(135deg, #4c6ef5, #6a82fb);
  border-radius: 12px;
  justify-content: center;
  align-items:  center;
  transition: bottom .75s linear;
  font-weight: 600;
  left: 8px;
  right: 8px;
  box-shadow: 0 12px 25px #4c6ef566;
}

.elevator-car .door {
  background: #fff3;
  border: 2px solid #fff6;
  border-radius: 8px;
  width: 70%;
  height: 70%;
}

#panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  background: #fff;
  border-radius: 16px;
  gap: 16px;
  padding: 16px;
  box-shadow: 0 15px 35px #0f235f1f;
}

.panel {
  display: flex;
  border: 1px solid #e0e7ff;
  border-radius: 12px;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
}

.panel h3 {
  margin: 0;
}

.panel .status {
  color: #555;
  margin: 0;
  font-size: .9rem;
}

.panel-buttons {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.panel-buttons button {
  color: #1c2752;
  cursor: pointer;
  background: #edf2ff;
  border: none;
  border-radius: 8px;
  padding: 8px 0;
  transition: background .2s, transform .2s;
  font-weight: 600;
}

.panel-buttons button.active {
  background: #ffd43b;
}

.panel-buttons button:hover {
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  main.layout {
    grid-template-columns: 1fr;
  }

  #shaft-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}