/* ===== Base ===== */
:root {
  --primary: #0d6efd;
  --bg: #f4f6f9;
  --card-bg: #ffffff;
  --text-main: #212529;
  --text-muted: #6c757d;
  --border-soft: #e0e0e0;
}

body {
  background: linear-gradient(180deg, #f8f9fa, #eef1f5);
  font-family: "Segoe UI", "Prompt", system-ui, sans-serif;
  color: var(--text-main);
}

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, #0d6efd, #0b5ed7);
  color: white;
  border-radius: 12px;
  margin-top: 20px;
}

header h2 {
  font-weight: 700;
}

header p {
  opacity: 0.9;
}

/* ===== Section ===== */
section {
  background: var(--card-bg);
  border-radius: 14px;
  padding: 20px 24px;
  margin-bottom: 24px;
  border: 1px solid var(--border-soft);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

section h4 {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

section ul {
  padding-left: 20px;
}

section ul li {
  margin-bottom: 6px;
}

/* ===== Screenshots ===== */
img {
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  transition: all 0.3s ease;
  background-color: #fff;
}

img:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

p.text-center {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Buttons ===== */
.btn-primary {
  background: linear-gradient(135deg, #0d6efd, #084298);
  border: none;
  padding: 10px 18px;
  font-weight: 500;
  border-radius: 10px;
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-outline-secondary {
  border-radius: 10px;
  padding: 10px 18px;
}

/* ===== Footer ===== */
footer {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 40px;
}

/* ===== Responsive polish ===== */
@media (max-width: 768px) {
  header {
    text-align: center;
  }

  section {
    padding: 18px;
  }
}