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

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: #eee;
  padding: 40px 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

h1 {
  text-align: center;
  margin-bottom: 10px;
}

.subtitle {
  text-align: center;
  color: #aaa;
  margin-bottom: 40px;
}

.section {
  background-color: #0f3460;
  border-radius: 16px;
  padding: 25px;
  margin-bottom: 30px;
}

.section-title {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 15px;
  color: #4a90e2;
  border-left: 4px solid #4a90e2;
  padding-left: 15px;
}

.section-description {
  color: #aaa;
  margin-bottom: 25px;
  font-size: 14px;
  padding-left: 19px;
}

.code {
  background-color: #0a0a1a;
  padding: 15px;
  border-radius: 8px;
  font-family: "Courier New", monospace;
  font-size: 13px;
  color: #82b1ff;
  overflow-x: auto;
  margin-top: 15px;
}

.comparison-box {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.method {
  flex: 1;
  min-width: 280px;
  background-color: #1a1a2e;
  border-radius: 12px;
  padding: 20px;
}

.method h3 {
  text-align: center;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid #4a90e2;
}

hr {
  border-color: #2a3a5a;
  margin: 30px 0;
}

/* ===================================
           DEMO 1: CARD GRID
           =================================== */
/* Flexbox version */
.flex-card-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.flex-card {
  flex: 1 1 200px;
  background-color: #4a90e2;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
}

/* Grid version */
.grid-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.grid-card {
  background-color: #4a90e2;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
}

/* ===================================
           DEMO 2: NAVIGATION BAR
           =================================== */
/* Flexbox version */
.flex-nav {
  background-color: #1a1a2e;
  padding: 15px 20px;
  border-radius: 8px;
}

.flex-nav ul {
  display: flex;
  justify-content: space-between;
  list-style: none;
}

.flex-nav a {
  color: white;
  text-decoration: none;
}

/* Grid version (less suitable) */
.grid-nav {
  background-color: #1a1a2e;
  padding: 15px 20px;
  border-radius: 8px;
}

.grid-nav ul {
  display: grid;
  grid-template-columns: repeat(5, auto);
  justify-content: space-between;
  list-style: none;
}

.grid-nav a {
  color: white;
  text-decoration: none;
}

/* ===================================
           DEMO 3: HOLY GRAIL LAYOUT
           =================================== */
/* Flexbox version (complicated) */
.flex-holygrail {
  display: flex;
  flex-direction: column;
  min-height: 400px;
}

.flex-header,
.flex-footer {
  background-color: #4a90e2;
  padding: 15px;
  text-align: center;
}

.flex-body {
  display: flex;
  flex: 1;
  gap: 20px;
  margin: 20px 0;
}

.flex-sidebar {
  background-color: #e94560;
  padding: 15px;
  width: 200px;
}

.flex-main {
  background-color: #2ecc71;
  padding: 15px;
  flex: 1;
}

/* Grid version (much simpler) */
.grid-holygrail {
  display: grid;
  grid-template-areas:
    "header header header"
    "sidebar main main"
    "footer footer footer";
  grid-template-columns: 200px 1fr 1fr;
  gap: 20px;
  min-height: 400px;
}

.grid-header {
  grid-area: header;
  background-color: #4a90e2;
  padding: 15px;
  text-align: center;
}
.grid-sidebar {
  grid-area: sidebar;
  background-color: #e94560;
  padding: 15px;
}
.grid-main {
  grid-area: main;
  background-color: #2ecc71;
  padding: 15px;
}
.grid-footer {
  grid-area: footer;
  background-color: #4a90e2;
  padding: 15px;
  text-align: center;
}

/* ===================================
           DEMO 4: PRODUCT CARD ROW
           =================================== */
/* Flexbox (natural) */
.flex-products {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.flex-product {
  flex: 1;
  min-width: 150px;
  background-color: #4a90e2;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
}

/* Grid (also works well) */
.grid-products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
}

.grid-product {
  background-color: #4a90e2;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
}

/* ===================================
           DEMO 5: TWO-COLUMN LAYOUT
           =================================== */
.two-col-demo {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.flex-side {
  flex: 1;
  background-color: #e94560;
  padding: 20px;
  border-radius: 8px;
}

.flex-side:first-child {
  background-color: #4a90e2;
}

.grid-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.grid-col {
  background-color: #4a90e2;
  padding: 20px;
  border-radius: 8px;
}

.grid-col:last-child {
  background-color: #e94560;
}

footer {
  text-align: center;
  padding: 40px;
  color: #666;
}

.verdict {
  background-color: #1a1a2e;
  padding: 15px;
  border-radius: 8px;
  margin-top: 15px;
  border-left: 4px solid #f39c12;
}