/* ===== Variables & Reset ===== */
:root {
  /* Paleta UBAM */
  --ubam-blue: #29ABE2;
  --ubam-blue-dark: #1E8FC4;
  --ubam-green: #7AC143;
  --ubam-green-dark: #5FA032;
  --ubam-gray: #58595B;
  --ubam-white: #FFFFFF;

  --sky-top: #29ABE2;
  --sky-bottom: #7DD3F0;
  --grass: #7AC143;
  --grass-dark: #5FA032;
  --dirt: #8B6914;
  --orange: #FF6B35;
  --orange-dark: #E55A2B;
  --yellow: #FFD93D;
  --purple: #29ABE2;
  --blue: #29ABE2;
  --red: #E74C3C;
  --white: #FFFFFF;
  --shadow: rgba(41, 171, 226, 0.2);
  --card-bg: #FFFFFF;
  --text: #58595B;
  --text-light: #7A7B7D;
  --border: 3px solid #29ABE2;
  --radius: 16px;
  --radius-sm: 10px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Fredoka', sans-serif;
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 60%, var(--grass) 60%, var(--grass-dark) 100%);
}

/* ===== Sky decorations ===== */
.sky-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.sun {
  position: absolute;
  top: 40px;
  right: 80px;
  width: 90px;
  height: 90px;
  background: var(--yellow);
  border-radius: 50%;
  border: 4px solid #F39C12;
  box-shadow: 0 0 40px rgba(255, 217, 61, 0.6);
  animation: pulse-sun 3s ease-in-out infinite;
}

@keyframes pulse-sun {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.cloud {
  position: absolute;
  background: white;
  border-radius: 50px;
  border: 3px solid #D5DBDB;
  opacity: 0.9;
}

.cloud::before, .cloud::after {
  content: '';
  position: absolute;
  background: white;
  border-radius: 50%;
  border: 3px solid #D5DBDB;
}

.cloud-1 {
  width: 100px;
  height: 40px;
  top: 60px;
  left: 10%;
  animation: float-cloud 20s linear infinite;
}

.cloud-1::before { width: 50px; height: 50px; top: -25px; left: 15px; }
.cloud-1::after { width: 60px; height: 40px; top: -15px; right: 10px; }

.cloud-2 {
  width: 80px;
  height: 35px;
  top: 120px;
  left: 50%;
  animation: float-cloud 25s linear infinite reverse;
}

.cloud-2::before { width: 40px; height: 40px; top: -20px; left: 10px; }
.cloud-2::after { width: 45px; height: 35px; top: -12px; right: 8px; }

.cloud-3 {
  width: 70px;
  height: 30px;
  top: 40px;
  left: 75%;
  animation: float-cloud 18s linear infinite;
}

.cloud-3::before { width: 35px; height: 35px; top: -18px; left: 8px; }
.cloud-3::after { width: 40px; height: 30px; top: -10px; right: 5px; }

@keyframes float-cloud {
  0% { transform: translateX(0); }
  100% { transform: translateX(30px); }
}

/* ===== Site Header (discreto) ===== */
.site-header {
  position: relative;
  z-index: 2;
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 20px 8px;
}

.site-header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-header-logo {
  flex-shrink: 0;
  width: 72px;
  height: auto;
  opacity: 0.92;
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.12));
}

.site-header-text {
  flex: 1;
  min-width: 0;
}

.site-header-kicker {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
  margin-bottom: 2px;
}

.site-header h1 {
  font-size: 1.65rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.18);
  letter-spacing: -0.3px;
  line-height: 1.15;
}

.site-header .subtitle {
  font-family: 'Patrick Hand', cursive;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
  margin-top: 2px;
}

.subtitle {
  font-family: 'Patrick Hand', cursive;
  font-size: 1.2rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ===== Layout ===== */
.layout {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: grid;
  grid-template-columns: 1fr 320px;
  grid-template-rows: auto auto auto auto;
  gap: 20px;
}

.canvas-section {
  grid-column: 1;
  grid-row: 1;
}

.controls-panel {
  grid-column: 2;
  grid-row: 1 / 3;
}

.stats-panel {
  grid-column: 1;
  grid-row: 2;
}

.formulas-panel {
  grid-column: 1 / -1;
  grid-row: 3;
}

.graph-panel {
  grid-column: 1 / -1;
  grid-row: 4;
}

/* ===== Panels ===== */
.canvas-section,
.controls-panel,
.stats-panel,
.formulas-panel,
.graph-panel {
  background: var(--card-bg);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: 6px 6px 0 var(--shadow);
  padding: 20px;
}

.canvas-section h2,
.controls-panel h2,
.stats-panel h2,
.formulas-panel h2,
.graph-panel h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ===== Canvas ===== */
.canvas-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

#sim-canvas {
  width: 100%;
  height: auto;
  border: 3px solid var(--text);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, #29ABE2 0%, #7DD3F0 70%, #7AC143 70%, #5FA032 100%);
  cursor: crosshair;
  display: block;
}

.canvas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.canvas-legend span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
  border: 2px solid var(--text);
}

.dot-theory { background: rgba(41, 171, 226, 0.5); }
.dot-actual { background: var(--orange); }
.dot-vx { background: var(--ubam-blue); }
.dot-vy { background: var(--red); }

/* ===== Buttons ===== */
.btn {
  font-family: 'Fredoka', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 18px;
  border: 3px solid var(--ubam-blue-dark);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 3px 3px 0 var(--shadow);
}

.btn:hover:not(:disabled) {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--shadow);
}

.btn:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--shadow);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--ubam-blue);
  color: white;
  border-color: var(--ubam-blue-dark);
}

.btn-primary:hover:not(:disabled) {
  background: var(--ubam-blue-dark);
}

.btn-secondary {
  background: var(--ubam-green);
  color: white;
  border-color: var(--ubam-green-dark);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

.toggle-label input {
  width: 18px;
  height: 18px;
  accent-color: var(--ubam-green);
}

/* ===== Controls ===== */
.control-group {
  margin-bottom: 20px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.value-display {
  background: rgba(41, 171, 226, 0.15);
  padding: 2px 10px;
  border-radius: 8px;
  border: 2px solid var(--ubam-blue);
  font-size: 0.85rem;
  min-width: 80px;
  text-align: center;
  color: var(--ubam-blue-dark);
}

input[type="range"] {
  width: 100%;
  height: 10px;
  -webkit-appearance: none;
  appearance: none;
  background: #E8E8E8;
  border-radius: 5px;
  border: 2px solid var(--text);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  background: var(--ubam-green);
  border: 3px solid var(--ubam-green-dark);
  border-radius: 50%;
  cursor: grab;
}

input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.angle-visual {
  height: 60px;
  margin-top: 8px;
  background: #F0F0F0;
  border: 2px dashed var(--text-light);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.angle-visual::before {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 20px;
  width: 50px;
  height: 4px;
  background: var(--text);
  transform-origin: left center;
  transition: transform 0.2s;
}

.gravity-presets {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.preset-btn {
  flex: 1;
  font-family: 'Fredoka', sans-serif;
  font-size: 0.75rem;
  padding: 6px 4px;
  background: rgba(41, 171, 226, 0.1);
  border: 2px solid var(--ubam-blue);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  color: var(--ubam-blue-dark);
}

.preset-btn:hover {
  background: var(--ubam-blue);
  color: white;
}

.tip-box {
  background: #FFF3CD;
  border: 2px solid #F39C12;
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 0.85rem;
  line-height: 1.4;
}

/* ===== Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.stat-card {
  background: #F8F9FA;
  border: 2px solid var(--text);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  transition: transform 0.15s;
}

.stat-card:hover {
  transform: scale(1.02);
}

.stat-card.highlight {
  background: linear-gradient(135deg, rgba(41, 171, 226, 0.12), rgba(122, 193, 67, 0.18));
  border-color: var(--ubam-green);
}

.stat-icon {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 4px;
  line-height: 1.2;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ===== Formulas ===== */
.formulas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.formula-card {
  background: rgba(41, 171, 226, 0.06);
  border: 2px solid var(--ubam-blue);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.formula-card h3 {
  font-size: 1rem;
  color: var(--ubam-blue-dark);
  margin-bottom: 8px;
}

.formula {
  font-family: 'Patrick Hand', cursive;
  font-size: 1.15rem;
  background: white;
  padding: 10px 14px;
  border-radius: 8px;
  border: 2px dashed var(--ubam-blue);
  margin-bottom: 8px;
  text-align: center;
}

.formula .note {
  font-size: 0.8rem;
  color: var(--text-light);
}

.formula-calc {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ubam-green-dark);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.formula-desc {
  font-size: 0.8rem;
  color: var(--text-light);
  line-height: 1.4;
}

/* ===== Graphs ===== */
.graphs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.graph-box {
  background: #FAFAFA;
  border: 2px solid var(--text);
  border-radius: var(--radius-sm);
  padding: 12px;
}

.graph-box h3 {
  font-size: 0.9rem;
  margin-bottom: 8px;
  text-align: center;
}

.graph-box canvas {
  width: 100%;
  height: auto;
  border-radius: 6px;
}

/* ===== Footer ===== */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 20px 16px 24px;
  font-size: 0.85rem;
  color: var(--text-light);
  background: var(--ubam-white);
  border-top: 4px solid var(--ubam-green);
  margin-top: 8px;
}

.footer-logo {
  display: block;
  max-width: 110px;
  height: auto;
  margin: 0 auto 12px;
  opacity: 0.95;
}

.footer-school {
  font-family: 'Fredoka', sans-serif;
  font-weight: 600;
  color: var(--ubam-gray);
  margin-top: 4px;
  font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .canvas-section,
  .controls-panel,
  .stats-panel,
  .formulas-panel,
  .graph-panel {
    grid-column: 1;
    grid-row: auto;
  }

  .graphs-row {
    grid-template-columns: 1fr;
  }

  .header h1,
  .site-header h1 {
    font-size: 1.35rem;
  }
}

@media (max-width: 600px) {
  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .site-header-logo {
    width: 64px;
  }

  .site-header h1 {
    font-size: 1.25rem;
  }

  .site-header .subtitle {
    font-size: 0.9rem;
  }

  .footer-logo {
    max-width: 96px;
  }

  .canvas-toolbar {
    justify-content: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .formulas-grid {
    grid-template-columns: 1fr;
  }
}

.back-link { display: inline-block; margin-bottom: 10px; color: rgba(255,255,255,.92); font-size: .85rem; font-weight: 600; text-decoration: none; }
.back-link:hover, .back-link:focus-visible { text-decoration: underline; }