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

:root {
  --bg-primary: #0f1117;
  --bg-secondary: #161922;
  --bg-card: #1c1f2e;
  --text-primary: #e4e6ef;
  --text-secondary: #9499b3;
  --accent: #6c63ff;
  --accent-hover: #857eff;
  --border: #2a2d3e;
  --radius: 8px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  padding: 4rem 0 3rem;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.header__title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.header__subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.nav__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.nav__link:hover {
  color: var(--accent);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.section__text {
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Form */
.form {
  max-width: 480px;
}

.form__group {
  margin-bottom: 1.25rem;
}

.form__label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form__input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

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

.form__textarea {
  resize: vertical;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--accent-hover);
}

/* Footer */
.footer {
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* Mobile */
@media (max-width: 600px) {
  .header {
    padding: 2.5rem 0 2rem;
  }

  .header__title {
    font-size: 1.75rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .nav {
    gap: 1rem;
  }
}