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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3e;
  --accent: #6c63ff;
  --accent-hover: #857dff;
  --text: #e2e8f0;
  --muted: #8892a4;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Nav */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--accent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--text);
}

/* Sections */
section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}

/* Hero */
.hero {
  text-align: center;
  padding-top: 8rem;
  padding-bottom: 8rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

/* Button */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s, transform 0.1s;
}

.btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

/* Cards */
.cards h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Contact */
.contact h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2.5rem;
}

#contact-form {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

label {
  font-size: 0.9rem;
  color: var(--muted);
}

input, textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
  width: 100%;
}

input:focus, textarea:focus {
  border-color: var(--accent);
}

#contact-form .btn {
  margin-top: 0.5rem;
  align-self: flex-start;
}

#form-feedback {
  text-align: center;
  color: var(--accent);
  margin-top: 1rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}