/* Anthro-Tech.org — Stylesheet */

:root {
  --color-bg: #fafafa;
  --color-bg-alt: #f0f0f0;
  --color-text: #1a1a1a;
  --color-text-muted: #555;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-accent: #7c3aed;
  --color-border: #ddd;
  --color-card-bg: #fff;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1100px;
  --radius: 8px;
}

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

html { scroll-behavior: smooth; }

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

.hidden { display: none !important; }

/* Typography */
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; }
h1 { font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-size: 2rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: 700px; margin: 0 auto; padding: 0 1.5rem; }

/* Navigation */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 250, 250, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 0;
}
.nav-container {
  max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-weight: 800; font-size: 1.25rem; color: var(--color-text); }
.nav-logo:hover { text-decoration: none; }
.nav-menu { list-style: none; display: flex; gap: 1.5rem; }
.nav-menu a { color: var(--color-text-muted); font-size: 0.9rem; font-weight: 500; }
.nav-menu a:hover { color: var(--color-primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

/* Hero */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, #e8eeff 100%);
}
.hero-subtitle {
  font-size: 1.15rem; color: var(--color-text-muted);
  max-width: 650px; margin: 0 auto 2rem;
}
.hero-stats {
  display: flex; justify-content: center; gap: 3rem;
  margin-bottom: 2rem; flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-number { display: block; font-size: 2rem; font-weight: 800; color: var(--color-primary); }
.stat-label { font-size: 0.85rem; color: var(--color-text-muted); }

/* Buttons */
.btn {
  display: inline-block; padding: 0.75rem 1.5rem; border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem; cursor: pointer;
  border: 2px solid transparent; transition: all 0.2s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-secondary:hover { background: var(--color-primary); color: #fff; }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-border); }
.btn-outline:hover { border-color: var(--color-primary); }

/* Sections */
.section { padding: 4rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-subtitle { font-size: 1.1rem; color: var(--color-text-muted); margin-bottom: 2rem; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--color-card-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 2rem; position: relative;
}
.card-badge {
  display: inline-block; background: var(--color-bg-alt); color: var(--color-text-muted);
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem; border-radius: 4px; margin-bottom: 0.75rem;
}
.card-badge-featured { background: var(--color-primary); color: #fff; }
.card-price {
  font-size: 1.5rem; font-weight: 800; color: var(--color-primary); margin-bottom: 1rem;
}
.price-annual { font-size: 0.9rem; font-weight: 500; color: var(--color-text-muted); }
.card-audience { font-size: 0.85rem; color: var(--color-text-muted); font-style: italic; margin: 1rem 0; }
.card ul { list-style: none; margin: 1rem 0; }
.card ul li { padding: 0.35rem 0 0.35rem 1.25rem; position: relative; font-size: 0.95rem; }
.card ul li::before { content: "→"; position: absolute; left: 0; color: var(--color-primary); }

/* Forms */
.form-inline {
  display: flex; gap: 0.75rem; flex-wrap: wrap;
  align-items: flex-start; margin-top: 1.5rem;
}
.form-inline input, .form-inline select {
  flex: 1; min-width: 200px; padding: 0.75rem 1rem;
  border: 1px solid var(--color-border); border-radius: var(--radius);
  font-size: 0.95rem; font-family: var(--font-body);
}
.form-stack { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 1rem; }
.form-stack input, .form-stack select, .form-stack textarea {
  padding: 0.75rem 1rem; border: 1px solid var(--color-border);
  border-radius: var(--radius); font-size: 0.95rem; font-family: var(--font-body);
  width: 100%;
}
.form-stack textarea { resize: vertical; }

/* Footer */
.footer {
  background: var(--color-text); color: #ccc; padding: 3rem 0 1.5rem;
}
.footer h4 { color: #fff; margin-bottom: 0.75rem; font-size: 1rem; }
.footer a { color: #aaa; }
.footer a:hover { color: #fff; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 0.4rem; font-size: 0.9rem; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; margin-bottom: 2rem; }
.footer-copyright {
  text-align: center; font-size: 0.8rem; color: #777;
  border-top: 1px solid #333; padding-top: 1.5rem;
}

/* Animations */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s, transform 0.6s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  .hero { padding: 3rem 0 2.5rem; }
  .hero-stats { gap: 1.5rem; }
  .card-grid, .card-grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-toggle { display: block; }
  .nav-menu {
    display: none; flex-direction: column; position: absolute;
    top: 100%; left: 0; right: 0; background: var(--color-bg);
    border-bottom: 1px solid var(--color-border); padding: 1rem 1.5rem;
  }
  .nav-menu.active { display: flex; }
  .form-inline { flex-direction: column; }
  .form-inline input, .form-inline select { min-width: 100%; }
}