/* =========================
   RESET / GLOBAL STYLES
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* =========================
   CSS VARIABLES
========================= */
:root {
  --primary-color: #1d3557;
  --secondary-color: #457b9d;
  --accent-color: #e9c46a;
  --light-color: #f8f9fa;
  --dark-color: #222222;
  --white: #ffffff;
  --gray: #e6e6e6;
  --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  --radius: 10px;
  --transition: 0.3s ease;
}

/* =========================
   BODY / GENERAL TEXT
========================= */
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  letter-spacing: 0.3px;
  background-color: var(--light-color);
  color: var(--dark-color);
}

h1,
h2,
h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
}

p {
  margin-bottom: 15px;
}

img {
  width: 100%;
  display: block;
  border-radius: var(--radius);
}

main {
  width: 90%;
  max-width: 1200px;
  margin: 30px auto;
}

section {
  margin-bottom: 40px;
}

/* =========================
   HEADER / NAVIGATION
========================= */
header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 20px;
  text-align: center;
}

header h1 {
  color: var(--white);
  margin-bottom: 15px;
}

/* Flexbox use 1 */
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

nav li {
  display: inline-block;
}

/* link pseudo-classes */
nav a:link {
  color: var(--white);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 6px;
  transition: background-color var(--transition), color var(--transition);
}

nav a:visited {
  color: var(--white);
}

nav a:hover {
  background-color: var(--accent-color);
  color: var(--dark-color);
}

nav a:active {
  background-color: var(--secondary-color);
  color: var(--white);
}

/* =========================
   HERO SECTION
========================= */
.hero {
  background: linear-gradient(rgba(29, 53, 87, 0.75), rgba(69, 123, 157, 0.75));
  color: var(--white);
  padding: 60px 20px;
  text-align: center;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero h2 {
  color: var(--white);
  font-size: 2rem;
  margin-bottom: 15px;
}

.hero p {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* =========================
   GRID LAYOUT
========================= */
/* Grid use 1 */
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

/* =========================
   CARD STYLES
========================= */
.card,
.travel-card {
  background-color: var(--white);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover,
.travel-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15);
}

.card h3,
.travel-card h3 {
  margin-bottom: 10px;
}

.card img,
.travel-card img {
  margin-bottom: 15px;
  height: 220px;
  object-fit: cover;
}

.card ul,
.travel-card ul {
  margin-top: 10px;
  padding-left: 20px;
}

.card li,
.travel-card li {
  margin-bottom: 8px;
}

/* Flexbox use 2 */
.card-container {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.card-container .card {
  flex: 1 1 250px;
  max-width: 350px;
}

/* =========================
   LIST STYLES
========================= */
ol,
ul {
  margin-bottom: 20px;
  padding-left: 25px;
}

li {
  margin-bottom: 8px;
}

/* =========================
   TABLE STYLES
========================= */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 35px;
  background-color: var(--white);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  overflow: hidden;
}

th,
td {
  border: 1px solid var(--gray);
  padding: 12px;
  text-align: left;
}

th {
  background-color: var(--secondary-color);
  color: var(--white);
}

tr:nth-child(even) {
  background-color: #f2f2f2;
}

/* =========================
   FORM STYLES
========================= */
form {
  background-color: var(--white);
  padding: 25px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-width: 700px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
}

input,
select,
textarea {
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
  border: 1px solid #cccccc;
  border-radius: 6px;
  font-size: 1rem;
  font-family: Arial, sans-serif;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent-color);
  border-color: var(--accent-color);
}

button {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  padding: 12px 20px;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
}

button:hover {
  background-color: var(--secondary-color);
  transform: scale(1.03);
}

button:active {
  transform: scale(0.98);
}

/* =========================
   ASIDE / EXTRA INFO
========================= */
aside {
  background-color: var(--white);
  padding: 20px;
  border-left: 6px solid var(--accent-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-top: 20px;
}

/* =========================
   LINKS IN CONTENT
========================= */
main a:link {
  color: var(--secondary-color);
  text-decoration: none;
  transition: color var(--transition);
}

main a:visited {
  color: #5a4b81;
}

main a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

main a:active {
  color: var(--accent-color);
}

/* =========================
   FOOTER
========================= */
footer {
  background-color: var(--primary-color);
  color: var(--white);
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}

/* =========================
   ID SELECTOR EXAMPLE
========================= */
#featured-title {
  text-align: center;
}

/* =========================
   COMBINATION SELECTORS
========================= */
.featured .card p {
  font-size: 0.95rem;
}

.card-container .card ul li {
  color: var(--dark-color);
}

/* =========================
   RESPONSIVE DESIGN
========================= */
@media (max-width: 900px) {
  .grid-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  header {
    padding: 15px;
  }

  nav ul {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .grid-container {
    grid-template-columns: 1fr;
  }

  .card-container {
    flex-direction: column;
    align-items: center;
  }

  .hero {
    padding: 40px 15px;
  }

  .hero h2 {
    font-size: 1.7rem;
  }

  main {
    width: 95%;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 0.95rem;
  }

  .hero h2 {
    font-size: 1.5rem;
  }

  th,
  td {
    padding: 8px;
    font-size: 0.9rem;
  }

  form {
    padding: 20px 15px;
  }
}