@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@700&family=Roboto+Condensed:wght@400;700&display=swap');

/* --- THEME & VARIABLES --- */
:root {
  --primary-color: #0D47A1;
  --inflow-color: #42A5F5;
  --outflow-color: #f44336;
  --stock-color: #FFC107;
  --accent-color: #FFA000;
  --background-color: #f0f4f8;
  --card-background: #ffffff;
  --text-color: #212121;
  --light-text-color: #fff;
  --border-radius: 8px;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* --- GENERAL & TYPOGRAPHY --- */
body {
  font-family: 'Roboto Condensed', sans-serif;
  line-height: 1.6;
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--primary-color);
  color: var(--light-text-color);
  text-align: center;
  padding: 1.5rem 1rem;
}

header h1, h2 {
  font-family: 'Montserrat', sans-serif;
}

footer {
  text-align: center;
  padding: 1rem;
  margin-top: auto;
  background-color: #e0e0e0;
  font-size: 0.85rem;
}

/* --- LAYOUT & CARDS --- */
main {
  width: 100%;
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
  display: grid;
  gap: 1.5rem;
}

section {
  background: var(--card-background);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

h2 {
  margin-top: 0;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

/* --- SVG DIAGRAM --- */
.diagram svg {
  width: 100%;
  height: auto;
}
#diagram .stock-rect {
  fill: var(--stock-color);
}
#diagram .inflow-arrow {
  stroke: var(--inflow-color);
}
#diagram .inflow-text {
  fill: var(--inflow-color);
  font-weight: bold;
}
#diagram .outflow-arrow {
  stroke: var(--outflow-color);
}
#diagram .outflow-text {
  fill: var(--outflow-color);
  font-weight: bold;
}
#diagram .stock-text {
  fill: var(--text-color);
  font-weight: bold;
}

/* --- CONTROLS & INPUTS --- */
.controls {
  display: grid;
  gap: 1.25rem;
}
input[type="text"], input[type="number"] {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  font-family: 'Roboto Condensed', sans-serif;
  box-sizing: border-box;
}
.label-control {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
}
.label-control label {
  font-weight: bold;
}

/* --- SLIDERS --- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 10px;
  background: #ddd;
  border-radius: 5px;
  outline: none;
  transition: opacity .2s;
}
input[type="range"]:hover {
  opacity: 1;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  cursor: pointer;
  border-radius: 50%;
}
input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  cursor: pointer;
  border-radius: 50%;
}

/* --- BUTTONS & SCENARIOS --- */
button, .scenario-btn {
  padding: 0.6rem 1rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: 'Roboto Condensed', sans-serif;
  font-weight: 700;
}
button:hover, .scenario-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
#applyShockBtn {
  background-color: var(--accent-color);
  color: var(--text-color);
  width: 100%;
  margin-top: 0.5rem;
}

.scenarios {
  display: grid;
  gap: 1rem;
}
.scenario-control {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  align-items: center;
}
.scenario-btn {
  background-color: #e0e0e0;
  color: #333;
  white-space: nowrap;
}

/* --- STOCK DISPLAY --- */
.stock-level {
  text-align: center;
}
#stockDisplay {
  font-size: 4rem;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  color: var(--text-color);
  margin: 0;
  padding: 1rem;
  background-color: #FFF8E1;
  border: 2px solid var(--stock-color);
  border-radius: var(--border-radius);
  animation: pulse 2.5s infinite ease-in-out;
}
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); }
}

/* --- TOAST NOTIFICATION --- */
.toast {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background-color: var(--primary-color);
  color: var(--light-text-color);
  padding: 0.75rem 1.25rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  font-size: 0.9rem;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}
.toast.show {
  opacity: 1;
}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 768px) {
  header h1 {
    font-size: 1.8rem;
  }
  main {
    margin: 1rem auto;
  }
  .label-control, .scenario-control {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  #stockDisplay {
    font-size: 3rem;
  }
}