:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --accent: #e94560;
  --accent-hover: #d63851;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --success: #4caf50;
  --error: #f44336;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.card {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}

.card-centered {
  max-width: 400px;
  margin: 60px auto;
}

.btn {
  display: inline-block;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s ease, opacity 0.3s ease;
  text-align: center;
}

.btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--accent);
  color: white;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-weight: 500;
}

.input {
  width: 100%;
  padding: 12px;
  background-color: var(--bg-tertiary);
  border: 1px solid transparent;
  color: var(--text-primary);
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
}

.header {
  position: sticky;
  top: 0;
  background-color: var(--bg-secondary);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  padding: 15px 0;
  z-index: 100;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: bold;
}

.header-nav {
  display: flex;
  gap: 15px;
  align-items: center;
}

.alert {
  padding: 15px;
  border-radius: 4px;
  margin-bottom: 20px;
  display: none;
}

.alert.show {
  display: block;
}

.alert-error {
  background-color: rgba(244, 67, 54, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

.alert-success {
  background-color: rgba(76, 175, 80, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.hero {
  text-align: center;
  padding: 80px 20px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin: 40px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2rem;
}

.feature-box {
  text-align: center;
}

.feature-box h3 {
  margin-bottom: 15px;
  font-size: 1.3rem;
}

.feature-box p {
  color: var(--text-secondary);
}

.step-box {
  background-color: var(--bg-secondary);
  padding: 30px;
  border-radius: 8px;
}

.step-box h3 {
  color: var(--accent);
  margin-bottom: 15px;
}

footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  border-top: 1px solid var(--bg-tertiary);
  margin-top: 60px;
}

.hidden {
  display: none !important;
}

@media (max-width: 768px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero-btns {
    flex-direction: column;
  }
}