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

/* Theme Variables */
:root {
  --bg-dark: #0f172a;
  --panel-dark: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.15);
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --text-light: #e5e7eb;
  --shadow: 0 8px 30px rgba(0,0,0,0.4);
}

/* Body */
body {
  font-family: "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1e293b, #020617);
  color: var(--text-light);
  min-height: 100vh;
  padding: 20px;
}

/* App Container */
.app-container {
  max-width: 1200px;
  margin: auto;
}

/* Header */
.app-header {
  text-align: center;
  margin-bottom: 20px;
}

.app-header h1 {
  font-size: 32px;
  letter-spacing: 1px;
  background: linear-gradient(90deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout */
.main-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
}

/* Sidebar */
.sidebar {
  background: var(--panel-dark);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.sidebar h2 {
  margin-bottom: 15px;
}

/* Control Groups */
.control-group {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Inputs */
input[type="text"] {
  padding: 10px;
  border-radius: 8px;
  border: none;
  outline: none;
  background: #1e293b;
  color: white;
}

/* Buttons */
button {
  padding: 10px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
  font-weight: 500;
  transition: all 0.25s ease;
}

button:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #818cf8, #6366f1);
}

/* Reset button special color */
.reset-btn {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.reset-btn:hover {
  background: linear-gradient(135deg, #f87171, #ef4444);
}

/* Graph Section */
.graph-section {
  background: var(--panel-dark);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Canvas */
#graph-canvas {
  border-radius: 10px;
  background: #020617;
}

/* Info Panel */
.info-panel {
  margin-top: 20px;
  background: var(--panel-dark);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.info-panel h2 {
  margin-bottom: 10px;
}

/* Slider */
input[type="range"] {
  width: 100%;
  cursor: pointer;
}