:root {
  --primary-bg: #0f172a;
  --secondary-bg: #1e293b;
  --text-color: #e2e8f0;
  --accent-color-1: #00B7FF;
  --accent-color-2: #00B7FF;
  --card-bg: rgba(30, 41, 59, 0.8);
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --primary-bg: #f1f5f9;
  --secondary-bg: #e2e8f0;
  --text-color: #1e293b;
  --card-bg: rgba(255, 255, 255, 0.8);
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--primary-bg);
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--secondary-bg);
  box-shadow: var(--shadow);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.theme-toggle {
  background: var(--card-bg);
  border: none;
  border-radius: 50px;
  padding: 0.5rem 1rem;
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  box-shadow: var(--shadow);
}

main {
  display: flex;
  flex: 1;
  padding: 2rem;
  gap: 2rem;
}

.robot-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

spline-viewer {
  width: 100%;
  height: 70vh;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tutorial-btn {
  margin-top: 1rem;
  background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
  color: white;
  border: none;
  border-radius: 50px;
  padding: 0.8rem 1.5rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.tutorial-btn:hover {
  transform: translateY(-2px);
}

.form-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

h1 {
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-weight: bold;
}

input[type="text"],
input[type="password"] {
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--secondary-bg);
  background: var(--primary-bg);
  color: var(--text-color);
}

.radio-group {
  display: flex;
  gap: 1rem;
  margin: 0.5rem 0;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color-1), var(--accent-color-2));
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.8rem 1.5rem;
  font-weight: bold;
  cursor: pointer;
  flex: 1;
}

.btn-secondary {
  background: var(--secondary-bg);
  color: var(--text-color);
  border: none;
  border-radius: 8px;
  padding: 0.8rem 1.5rem;
  font-weight: bold;
  cursor: pointer;
  flex: 1;
}

.result-container {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--secondary-bg);
  border-radius: 8px;
}

.tutorial-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.tutorial-content {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 15px;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
}

.close-tutorial {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-color);
  cursor: pointer;
}

footer {
  text-align: center;
  padding: 1rem;
  background: var(--secondary-bg);
  margin-top: auto;
}

@media (max-width: 768px) {
  main {
    flex-direction: column;
  }
  
  .robot-container, .form-container {
    width: 100%;
  }
}