/* layout.css — global layout, containers, utilities, typography */

/* CSS Variables / Theme */
:root{
  --accent: #0b6efd;
  --bg: #f9fafc;
  --text: #222;
  --muted: #6b7280;
  --panel-bg: #ffffff;
  --radius: 12px;
  --container-max: 1200px;
  --gutter: 20px;
  --shadow-sm: 0 6px 18px rgba(11,110,253,0.08);
  --glass: rgba(255,255,255,0.75);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color-scheme: light;
}

/* Base */
* { box-sizing: border-box; }

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  overflow-y: scroll; /* Always show scrollbar to prevent layout shift */
}

body {
  margin: 0;
  padding: 0;
  padding-top: 130px; /* Space for fixed header */
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-family, Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
}

/* --------- Layout containers ---------- */
/* Main page wrapper for content (centered) */
main,
.page-wrapper {
  max-width: 100%;
  margin: 0;
  padding: 0;
  width: 100%;
  box-sizing: border-box;
  overflow-x: hidden;
}

/* Generic section inner container (for sections that use full-width background) */
.section-inner,
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  width: 100%;
}

/* Utility: centered content block (common) */
.center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* Simple grid helpers */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.col {
  flex: 1 1 0%;
}

/* Heading defaults */
h1, h2, h3, h4 {
  margin: 0 0 16px 0;
  line-height: 1.15;
  color: var(--text);
}
h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; }

/* Text utilities */
.lead { font-size: 1.05rem; color: var(--muted); }
.text-center { text-align: center; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--accent);
  border: none;
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
}
.btn:hover { opacity: 0.95; transform: translateY(-1px); }

/* Header sticky behavior: ensure header doesn't overlap main content */
header, .header-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  background: transparent; /* header component can define own background */
}

/* Footer spacing */
footer, .footer {
  margin-top: 0;
  padding: 40px 0;
  width: 100%;
}

/* Card defaults */
.card {
  background: var(--panel-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  padding: 18px;
}

/* Modal: ensure modal centers perfectly (works with your modal HTML) */
.modal-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.45);
  z-index: 2000;
}
.modal-content {
  width: 100%;
  max-width: 420px;
  background: var(--panel-bg);
  border-radius: 12px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
}

/* Responsive */
@media (max-width: 1024px) {
  main, .page-wrapper { padding: 18px; }
  h1 { font-size: 1.9rem; }
}

@media (max-width: 768px) {
  .row { flex-direction: column; }
  .nav-links { gap: 12px; }
  main, .page-wrapper { padding: 14px; }
  
  body {
    padding-top: 130px;
  }
}

@media (max-width: 480px) {
  body {
    padding-top: 130px;
  }
}

/* Tiny helpers */
.muted { color: var(--muted); font-size: 0.95rem; }
.small { font-size: 0.9rem; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mt-1 { margin-top: 8px; }