:root {
  --panel: #fffaf0;
  --ink: #152238;
  --accent: #d14b22;
  --accent-soft: #f8cdbf;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 20%, #fdf7e5 0%, transparent 45%),
    radial-gradient(circle at 80% 10%, #f7d9c9 0%, transparent 40%),
    linear-gradient(140deg, #f3efe4 0%, #efe6d2 100%);
  min-height: 100vh;
}

.layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 20px;
  grid-template-columns: 2fr 1fr;
}

.panel {
  background: color-mix(in srgb, var(--panel) 90%, white 10%);
  border: 2px solid color-mix(in srgb, var(--ink) 12%, transparent);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgb(21 34 56 / 10%);
  padding: 18px;
}

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

.panel-header p {
  margin: 8px 0 0;
}

#game {
  width: 100%;
  border-radius: 14px;
  border: 2px solid color-mix(in srgb, var(--ink) 20%, transparent);
  background: linear-gradient(180deg, #f4f8ff 0%, #d7e2ff 100%);
  margin-top: 12px;
  touch-action: none;
  cursor: grab;
}

.hud {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.energy-warning {
  margin-top: 10px;
  display: flex;
  gap: 10px;
  align-items: center;
  background: #ffe9df;
  border: 2px solid #d14b22;
  border-radius: 10px;
  padding: 8px 10px;
  font-weight: 500;
}

#resetBtn,
.spell,
#difficultySelect,
.formula-grid input,
#tutorialBtn,
#sandboxDeleteBtn,
#energyRestartBtn,
#clearSandboxBtn {
  border: 2px solid var(--ink);
  border-radius: 12px;
  background: white;
  font: inherit;
  padding: 10px 12px;
  cursor: pointer;
  transition: transform 120ms ease, background-color 120ms ease;
}

#resetBtn:hover,
.spell:hover {
  transform: translateY(-1px);
  background: #fff7ec;
}

#resetBtn:active,
.spell:active {
  transform: translateY(0);
}

#difficultySelect,
.formula-grid input {
  cursor: text;
  transition: background-color 120ms ease;
}

.panel-spells h2 {
  margin-top: 0;
}

.help {
  margin-top: 0;
}

.aim-box {
  border: 2px dashed color-mix(in srgb, var(--ink) 25%, transparent);
  border-radius: 12px;
  padding: 12px;
  background: var(--accent-soft);
  display: grid;
  gap: 4px;
}

.spell-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.difficulty-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

#difficultySelect {
  padding: 6px 10px;
}

.formula-box {
  margin-top: 14px;
  border-radius: 12px;
  background: #fff6e8;
  padding: 12px;
}

.sandbox-box {
  margin-top: 14px;
  border-radius: 12px;
  background: #eef8ff;
  padding: 12px;
}

.sandbox-controls {
  display: grid;
  gap: 8px;
}

.hidden {
  display: none !important;
}

#buildMode {
  border: 2px solid var(--ink);
  border-radius: 10px;
  padding: 6px 8px;
  font: inherit;
}

#sandboxDeleteBtn.active {
  background: #ffd9ce;
  border-color: #d14b22;
}

.tutorial-modal {
  position: fixed;
  inset: 0;
  background: rgb(21 34 56 / 45%);
  display: grid;
  place-items: center;
  padding: 16px;
  z-index: 20;
}

.tutorial-card {
  width: min(560px, 100%);
  background: #fffaf0;
  border-radius: 14px;
  border: 2px solid color-mix(in srgb, var(--ink) 20%, transparent);
  padding: 16px;
}

.tutorial-card h3 {
  margin: 0 0 8px;
}

.tutorial-card p {
  margin: 0;
}

.tutorial-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
}

.formula-box h3 {
  margin: 0 0 4px;
  font-size: 1rem;
}

.formula-box p {
  margin: 0 0 8px;
  font-size: 0.92rem;
}

.formula-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 8px;
  align-items: end;
}

.formula-grid label {
  display: grid;
  gap: 4px;
  font-size: 0.9rem;
  min-width: 0;
}

.formula-grid input {
  padding: 6px 8px;
  width: 100%;
  min-width: 0;
}

.spell {
  display: grid;
  text-align: left;
  gap: 6px;
}

.spell strong {
  color: var(--accent);
  font-size: 1rem;
}

details {
  margin-top: 14px;
  background: #fff6e8;
  border-radius: 10px;
  padding: 10px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .formula-grid {
    grid-template-columns: 1fr;
  }
}