/* ── StemLab Website ── */

/* ── Custom Properties ── */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a26;
  --bg-card-hover: #22222f;
  --border: #2a2a3a;
  --text-primary: #f0f0f5;
  --text-secondary: #9090a8;
  --text-muted: #606078;
  --accent: #7c5cfc;
  --accent-hover: #9478ff;
  --accent-glow: rgba(124, 92, 252, 0.15);
  --success: #34d399;
  --error: #f87171;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --max-width: 1100px;
  --radius: 12px;
  --radius-sm: 8px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; display: block; }

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ── Hero ── */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero-icon {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  margin: 0 auto 32px;
  box-shadow: 0 8px 32px rgba(124, 92, 252, 0.2);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 99px;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.hero-cta:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

.hero-cta svg {
  width: 18px;
  height: 18px;
}

.hero-note {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Features Grid ── */
.features {
  padding: 60px 0;
}

.features h2 {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: background 0.2s, border-color 0.2s;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── How It Works ── */
.how-it-works {
  padding: 60px 0 80px;
}

.how-it-works h2 {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ── Page Content (Privacy, Support) ── */
.page-header {
  padding: 60px 0 32px;
  text-align: center;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--text-secondary);
  margin-top: 8px;
}

.page-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.page-content h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 12px;
}

.page-content p, .page-content li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.page-content ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

.page-content li { margin-bottom: 6px; }

/* ── FAQ ── */
.faq {
  margin-bottom: 48px;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.faq-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ── Contact Form ── */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.contact-form h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  margin-top: 0;
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font);
  transition: border-color 0.2s;
}

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

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 28px;
  border-radius: 99px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.form-submit:hover { background: var(--accent-hover); }
.form-submit:disabled { opacity: 0.6; cursor: not-allowed; }

.form-status {
  margin-top: 16px;
  font-size: 0.9rem;
  min-height: 24px;
}

.form-status.success { color: var(--success); }
.form-status.error { color: var(--error); }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

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

.footer-left {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links a:hover { color: var(--text-primary); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 24px; }
  .hero { padding: 60px 0 48px; }
  .footer .container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .nav-links { gap: 20px; }
  .contact-form { padding: 24px 20px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}