/* Base / Theme */
:root {
  --ink: #eaeaea;
  --accent: #88c0d0;
  --panel: rgba(255, 255, 255, 0.04);
  --shadow: rgba(0,0,0,0.4);
  --edge: #3a4252;
}

* { box-sizing: border-box; }
img { max-width: 100%; height: auto; display: block; }

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #1c1f26, #2e3440);
  color: var(--ink);
  /* IMPORTANT: no flex here; let the page flow naturally */
  text-align: center;
}

/* Optional centered card */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

/* Header */
header {
  padding: 1.5rem 0 0.5rem;
}
h1 {
  font-size: 2.2rem;
  margin: 0 0 0.5rem 0;
}

/* Copy */
p {
  font-size: 1.1rem;
  line-height: 1.55;
  opacity: 0.9;
}
.divider {
  width: 60px;
  height: 2px;
  background-color: var(--accent);
  margin: 1.5rem auto;
}

/* Video Library */
#video-library { margin-top: 2em; }
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25em;
  margin-top: 1em;
}
.video-item {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 12px;
  padding: 0.9em;
  box-shadow: 0 4px 20px var(--shadow);
}
.video-item iframe {
  width: 100%;
  aspect-ratio: 16 / 9;   /* responsive */
  border: 0;
  border-radius: 8px;
  background: #000;
}
.video-item h3 {
  font-size: 1.1em;
  color: var(--accent);
  margin: 0.5em 0 0.2em;
}
.video-item p {
  font-size: 0.9em;
  color: #cfcfcf;
  margin: 0;
}

/* PDF Library */
#pdf-library {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--edge);
  border-radius: 12px;
  padding: 2em 1.25em;
  margin-top: 2em;
}
#pdf-library h2 { color: var(--accent); margin-top: 0; }
#pdf-library p { color: #d7d7d7; margin-top: 0.25em; }

.pdf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 1.25em;
}
.pdf-item {
  text-align: center;
  border: 1px solid var(--edge);
  padding: 1em;
  border-radius: 10px;
  background-color: rgba(255,255,255,0.04);
  box-shadow: 0 4px 14px var(--shadow);
}
.pdf-item a { text-decoration: none; color: var(--ink); }
.pdf-item div { margin-top: 0.55em; }
.pdf-item span { color: var(--accent); font-size: 0.95em; }

/* Buttons */
.btn, .orders a, .usage-guide-link, button {
  display: inline-block;
  background-color: #4c7aa6;
  color: #fff;
  padding: 0.8em 1.3em;
  margin: 0.4em;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  line-height: 1;
  border: 1px solid var(--edge);
  box-shadow: 0 6px 18px var(--shadow);
}
.btn:hover, .orders a:hover, .usage-guide-link:hover, button:hover {
  background-color: #3e6990;
}

/* Footer */
footer {
  font-size: 0.9rem;
  margin-top: 2rem;
  opacity: 0.8;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--edge);
}
footer img {
  display: block;
  margin: 1em auto 0 auto; /* centers the logo in the footer */
}
/* Even-width button row for helper docs */
.btn-row {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.btn-row .btn { min-width: 260px; }