:root {
    --bg: #0b1220;
    --panel: #0f1a2b;
    --ink: #e6eefc;
    --muted: #a7b3c7;
    --acc: #5aa9ff;
    --ok: #47d7ac;
    --warn: #ffcf5a;
    --bad: #ff7a7a;
    --code: #0c1526;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, system-ui, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.6;
}

header {
    padding: 28px 16px 12px;
    background: linear-gradient(180deg, #101c33, transparent);
    display: flex;
    flex-direction: column;
    align-items: center; /* horizontally centers all child elements */
}

header h1 {
    margin: 0 0 6px;
    font-size: clamp(1.6rem, 2.6vw, 2.3rem);
}

header p {
    margin: 4px 0 0;
    color: var(--muted);
}

main {
    max-width: 1080px;
    margin: 0 auto;
    padding: 16px;
}

.toc {
    background: var(--panel);
    border: 1px solid #1d2a42;
    border-radius: 16px;
    padding: 14px 16px;
    margin: 10px 0 24px;
}

.toc h2 {
    margin: 0 0 8px;
    font-size: 1rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.toc a {
    display: inline-block;
    margin: 6px 10px 6px 0;
    color: var(--acc);
    text-decoration: none;
}

section.pattern {
    background: var(--panel);
    border: 1px solid #1d2a42;
    border-radius: 18px;
    padding: 18px 18px 8px;
    margin: 18px 0;
    scroll-margin-top: 90px;
}

h2 {
    margin: 0.2rem 0 8px;
    font-size: clamp(1.2rem, 2vw, 1.5rem);
}

.meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 6px 0 12px;
}

.chip {
    font-size: 0.78rem;
    border: 1px solid #23334f;
    background: #0c172a;
    border-radius: 999px;
    padding: 4px 10px;
    color: var(--muted);
}

.good {
    border-color: #214635;
    color: #b7f3df;
    background: #0c1f1a;
}

.warn {
    border-color: #5a4a1d;
    color: #ffe9ae;
    background: #231d0a;
}

details {
    margin: 8px 0 10px;
}

summary {
    cursor: pointer;
    color: var(--acc);
}

.card {
  background:#0b1629;
  border:1px solid #1b2a45;
  border-radius:14px;
  padding:12px;
  margin:10px 0;
  min-width:0; /* allows shrinking in a grid */
}

.grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

@media (min-width: 800px){
  .grid {
    display: grid;
    gap: 12px;
    grid-template-columns: 3.5fr 1fr; /* Code gets 2/3, explanation 1/3 */
  }
}

pre {
  overflow-x: auto; /* prevents pre from breaking layout */
  max-width: 100%;
}

code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 0.92rem;
}

.row {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: space-between;
    margin: 6px 0;
}

.btn {
    cursor: pointer;
    border: 1px solid #254066;
    background: #0f203a;
    color: var(--ink);
    border-radius: 10px;
    padding: 6px 10px;
    font-size: 0.85rem;
}

.btn:hover {
    background: #13274a;
}

.notes {
    color: var(--muted);
    font-size: 0.95rem;
}

footer {
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
    padding: 28px;
    position: fixed;  /* Keep it at the bottom of the viewport */
    bottom: 0;
    width: 100%;
    background-color: transparent; /* Transparent background */
    z-index: 1000;   /* Ensure it sits above other content */
}

.footer-paragraph {
    color: #92d7ff; /* base color for the paragraph */
    margin: 0;
}

.footer-paragraph a {
    color: #5aa9ff; /* same as paragraph base color */
    font-weight: bold;
    transition: color 0.3s ease; /* smooth color transition */
}

.footer-paragraph a:hover {
    color: #92d7ff; /* color on hover */
}

.ex-title {
    margin: 0 0 6px;
    font-weight: 600;
    color: #cfe0ff;
}