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

html,
body {
  height: 100%;
}

body {
  font-family: "Libre Baskerville", Georgia, "Times New Roman", serif;
  background: #ffffff;
  color: #111;
  line-height: 1.6;

  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* HEADER */
header {
  border-bottom: 1px solid #eee;
  font-family: system-ui, -apple-system, sans-serif;
}

.nav {
  height: 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: system-ui, -apple-system, sans-serif;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;

  text-decoration: none;
  color: #111;
}

.logo img {
  width: 32px;
  height: 32px;
  display: block;
}

.logo span {
  font-family: "Libre Baskerville", Georgia, "Times New Roman", serif;
  font-size: 1.6rem;        /* lớn hơn */
  font-weight: 700;
  letter-spacing: 0.04em;   /* cổ điển hơn */
  line-height: 1;
}


.nav ul {
  list-style: none;
  display: flex;
  gap: 1.25rem;
}

.nav a {
  text-decoration: none;
  color: #555;
  font-size: 0.95rem;
}

.nav a:hover {
  color: #000;
}

/* HERO / TITLES */
.section-title {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-family: "Libre Baskerville", Georgia, "Times New Roman", serif;
}

/* BUTTON */
.button {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  background: #111;
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.95rem;
  min-height: 44px;
}

.button.secondary {
  background: transparent;
  border: 1px solid #ddd;
  color: #111;
}

/* GRID – APPS */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* CARD */
.card {
  border: 1px solid #eee;
  border-radius: 14px;
  padding: 1.5rem;

  display: flex;
  flex-direction: column;
  height: 100%;
}

.card img {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  background: #ddd;
  margin-bottom: 1rem;
}

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

.card p {
  font-size: 0.95rem;
  color: #555;
  flex: 1;
}

.card .button {
  margin-top: 1rem;
  align-self: flex-start;
}

@media (hover: hover) {
  .card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  }
}

section p {
    max-width: 1100px;
    line-height: 1.7;
    opacity: 0.85;
    margin-top: 16px;
    margin-bottom: 16px;
}

/* FOOTER */
footer {
  border-top: 1px solid #eee;
  padding: 2rem 0;
  font-size: 0.9rem;
  color: #666;
  font-family: system-ui, -apple-system, sans-serif;
}

footer nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

footer a {
  text-decoration: none;
  color: #555;
}

footer a:hover {
  color: #000;
}