:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #6b6b6b;
  --border: #e6e6e6;
}

[data-theme="dark"] {
  --bg: #0e0e0e;
  --text: #f5f5f5;
  --muted: #9a9a9a;
  --border: #1f1f1f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 760px;
  margin: auto;
  padding: 88px 24px;
}

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

h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0;
}

.subtitle {
  margin-top: 14px;
  font-size: 1.1rem;
  color: var(--muted);
}

.links {
  margin: 44px 0;
}

.links a {
  margin-right: 22px;
  text-decoration: none;
  color: var(--text);
  position: relative;
}

.links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background: var(--text);
  transition: width 0.25s ease;
}

.links a:hover::after {
  width: 100%;
}

section {
  margin-top: 72px;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 16px;
}

p {
  max-width: 60ch;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 10px;
}

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

footer {
  margin-top: 110px;
  font-size: 0.9rem;
  color: var(--muted);
}

button {
  background: none;
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text);
}

/* Animations */

.fade-in {
  animation: fade 0.8s ease forwards;
}

@keyframes fade {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}