/* ============================================
   Bicycle Animation - Stylesheet
   ============================================ */

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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: lavender;
  color: #333;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ---------- Utility ---------- */

.hidden {
  display: none !important;
}

/* ---------- Screens ---------- */

.screen {
  text-align: center;
  width: 100%;
  max-width: 1060px;
  padding: 1rem;
}

/* ---------- Home Screen ---------- */

#home-screen h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

#home-screen p {
  font-size: 1.2rem;
  color: #555;
  margin-bottom: 2rem;
}

/* ---------- Buttons ---------- */

.btn {
  padding: 12px 40px;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn:active {
  transform: translateY(0);
}

/* ---------- Animation Screen ---------- */

#animation-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.back-link {
  align-self: flex-start;
  color: #a0a0c0;
  text-decoration: none;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: #fff;
}

#canvas {
  border: 2px solid #333;
  border-radius: 8px;
  background: #fff;
  max-width: 100%;
}

#rerun-btn {
  margin-top: 0.5rem;
}