:root {
  --bg: #f3f7fb;
  --panel: #ffffff;
  --border: #d7e2ef;
  --text: #133047;
  --muted: #4a6982;
  --primary: #0a7ea4;
  --primary-strong: #066488;
  --accent: #f0a12b;
  --shadow: 0 12px 28px rgba(13, 46, 74, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Tahoma, Arial, sans-serif;
  background: radial-gradient(circle at 20% 15%, #e7f3ff 0%, #f7fbff 40%, #f0f6fb 100%);
  color: var(--text);
}

.app-header {
  padding: 1.2rem 1.2rem 0.4rem;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.2vw, 2rem);
}

.app-header p {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.app-layout {
  max-width: 1360px;
  margin: 0 auto;
  padding: 1rem 1rem 1.4rem;
  display: grid;
  direction: ltr;
  gap: 1rem;
  grid-template-columns: 1.35fr 1fr;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1rem;
  direction: rtl;
}

.simulation-panel h2,
.card h2 {
  margin: 0 0 0.7rem;
  font-size: 1.1rem;
}

.canvas-wrap {
  background: linear-gradient(180deg, #f6fbff, #edf6ff);
  border: 1px solid #c5d8ea;
  border-radius: 12px;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  max-height: 62vh;
}

.playback-controls {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

button,
select,
input[type="range"] {
  font-family: inherit;
}

.playback-controls button {
  border: 1px solid #c0d4e6;
  background: #fff;
  color: #184564;
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.playback-controls button:hover {
  border-color: #8fb6d5;
  transform: translateY(-1px);
}

.playback-controls button.active {
  background: #e6f6ff;
  border-color: #81b7d9;
}

.time-display {
  margin: 0.8rem 0 0;
  font-weight: 700;
  color: #1e516f;
}

.controls-panel {
  display: grid;
  gap: 0.8rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem;
  background: #fff;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin: 0.5rem 0 0.3rem;
}

.value-pill {
  background: #ecf5ff;
  color: #0f4f76;
  border: 1px solid #c2ddf4;
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-size: 0.85rem;
  min-width: 62px;
  text-align: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  margin: 0 0 0.35rem;
}

select {
  width: 100%;
  border-radius: 9px;
  border: 1px solid #c4d7e8;
  padding: 0.5rem;
  margin-bottom: 0.45rem;
  background: #fff;
}

.run-btn {
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 0.82rem 1rem;
  margin-top: 0.6rem;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  box-shadow: 0 10px 20px rgba(9, 101, 144, 0.24);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.run-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 13px 22px rgba(9, 101, 144, 0.3);
}

fieldset {
  border: 1px solid #cbdff0;
  border-radius: 10px;
  margin: 0.5rem 0;
  padding: 0.55rem;
}

legend {
  padding: 0 0.25rem;
  color: #174e6f;
  font-weight: 700;
  font-size: 0.95rem;
}

fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  margin-inline-end: 0.65rem;
  margin-bottom: 0.25rem;
  cursor: pointer;
}

.feedback-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.feedback-list li {
  background: #f5faff;
  border: 1px solid #d4e4f3;
  border-radius: 9px;
  padding: 0.4rem 0.55rem;
  color: #1e4a6a;
  font-size: 0.93rem;
}

.prediction-feedback {
  margin: 0.65rem 0 0;
  font-weight: 700;
  color: #0f5f82;
  background: #ecf7ff;
  border: 1px solid #c5e1f5;
  border-radius: 10px;
  padding: 0.55rem;
}

.note-card {
  background: linear-gradient(135deg, #fffaf0, #fff4d8);
  border-color: #f0d9a1;
}

.note-card p {
  margin: 0;
  color: #6d4f17;
}

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

  .simulation-panel {
    order: 1;
  }

  .controls-panel {
    order: 2;
  }
}