* {
  box-sizing: border-box;
}

:root {
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 10px 24px rgba(31, 41, 55, 0.08);
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 40%, #f9fafb 100%);
  color: var(--text);
}

.container {
  width: min(900px, 92%);
  margin: 40px auto 60px;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
}

.subtitle {
  margin-top: 10px;
  color: var(--muted);
}

.feed {
  margin-top: 24px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.card img {
  display: block;
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.card-content {
  padding: 14px 16px 18px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.loader,
.end-message {
  margin: 22px 0 8px;
  text-align: center;
  color: var(--muted);
  font-weight: 600;
}

.sentinel {
  height: 1px;
}

@media (max-width: 640px) {
  .container {
    margin-top: 28px;
  }

  .card img {
    height: 210px;
  }
}