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

:root {
  --black: #0f0f0f;
  --white: #ffffff;
  --gray: #6b7280;
  --border: #e5e7eb;
  --max-width: 1100px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--black);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 2rem 0;
}

.hero__inner {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--black);
  display: block;
  padding-top: 0.25rem;
}

.hero__center {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 0;
}

.tagline {
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  max-width: 14ch;
  margin-bottom: 1.5rem;
}

.subline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--gray);
  max-width: 52ch;
  line-height: 1.65;
}

/* ── Mission ── */
.mission {
  padding: 6rem 0;
  border-top: 1px solid var(--border);
}

.mission__text {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.75;
  max-width: 60ch;
}

/* ── Founder ── */
.founder {
  padding: 6rem 0;
  border-top: 1px solid var(--border);
}

.founder__inner {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
}

.founder__photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.founder__name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.2rem;
}

.founder__role {
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: 1rem;
}

.founder__bio {
  font-size: 1rem;
  line-height: 1.7;
  max-width: 52ch;
  margin-bottom: 1.25rem;
}

.founder__links {
  display: flex;
  gap: 1.5rem;
}

.founder__links a {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--black);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color 0.15s;
}

.founder__links a:hover {
  color: var(--gray);
}

/* ── Footer ── */
.footer {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer__contact {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.footer__contact a {
  color: var(--black);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color 0.15s;
}

.footer__contact a:hover {
  color: var(--gray);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--gray);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero {
    padding: 1.5rem 0;
  }

  .founder__inner {
    flex-direction: column;
    gap: 1.5rem;
  }

  .mission,
  .founder {
    padding: 4rem 0;
  }

  .footer {
    padding: 2.5rem 0;
  }
}