/* ============================================================
   CUDA Week — shared design system
   ============================================================ */

:root {
  --bg:        #0a0a0b;
  --bg-soft:   #111114;
  --surface:  #16161a;
  --surface-2:#1c1c22;
  --border:   rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.16);

  --text:     #ececef;
  --text-dim: #a0a0a8;
  --text-muted:#6f6f78;

  --accent:    #76b900;          /* NVIDIA green */
  --accent-2:  #00d4ff;          /* electric cyan */
  --accent-warn:#ff9d4d;
  --accent-red:#ff5a5a;

  --code-bg:  #0d0d10;
  --code-border:rgba(118,185,0,0.18);

  --radius:   14px;
  --radius-sm:8px;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  --serif: "Iowan Old Style", "Charter", Georgia, serif;

  --max:    760px;
  --max-wide:1080px;
}

* { box-sizing: border-box; }
html, body { margin:0; padding:0; }
html { background: var(--bg); }
body {
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(1100px 600px at 80% -200px, rgba(118,185,0,0.08), transparent 70%),
    radial-gradient(900px 500px at -10% 10%, rgba(0,212,255,0.05), transparent 70%),
    var(--bg);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: #0a0a0b; }

a { color: var(--accent-2); text-decoration: none; border-bottom: 1px solid rgba(0,212,255,0.25); }
a:hover { border-color: var(--accent-2); }

/* ---- Top nav ---- */
.topnav {
  position: sticky; top:0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(10,10,11,0.78);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text);
  text-transform: uppercase;
  border-bottom: none;
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
}
.dayhop { display: flex; gap: 4px; flex-wrap: wrap; }
.dayhop a {
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text-dim);
  border: 1px solid transparent;
}
.dayhop a:hover { color: var(--text); background: var(--surface); border-color: var(--border); }
.dayhop a.current {
  color: var(--accent);
  border-color: rgba(118,185,0,0.4);
  background: rgba(118,185,0,0.08);
}

/* ---- Layout ---- */
main { max-width: var(--max); margin: 0 auto; padding: 56px 24px 96px; }
main.wide { max-width: var(--max-wide); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 28px;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 56px 0 14px;
}
h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 32px 0 8px;
  color: var(--text);
}
h4 {
  font-size: 14px;
  font-weight: 600;
  margin: 24px 0 6px;
  color: var(--text);
  font-family: var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-dim);
}

p { margin: 14px 0; color: var(--text); }
.lede {
  font-size: 21px;
  line-height: 1.5;
  color: var(--text-dim);
  margin: 22px 0 36px;
  font-family: var(--serif);
}

ul, ol { padding-left: 22px; }
li { margin: 6px 0; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 56px 0;
}

strong { color: #fff; font-weight: 600; }
em { color: var(--text-dim); font-style: italic; }
small { color: var(--text-muted); font-size: 13px; }

blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 3px solid var(--accent);
  background: rgba(118,185,0,0.04);
  font-family: var(--serif);
  font-size: 18px;
  color: var(--text);
}
blockquote cite { display:block; margin-top:8px; font-size:13px; font-family: var(--sans); color: var(--text-muted); font-style: normal; }

/* ---- Code ---- */
code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: #d6e9ad;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
  margin: 22px 0;
  color: #e2e2e6;
}
pre code { background: transparent; border: none; padding: 0; color: inherit; }
pre .c  { color: #6f6f78; font-style: italic; }   /* comment */
pre .k  { color: var(--accent); }                  /* keyword */
pre .s  { color: #ffd28a; }                        /* string */
pre .n  { color: var(--accent-2); }                /* number */
pre .p  { color: #d68fff; }                        /* prompt $ */
pre .o  { color: #ff7da3; }                        /* output */

.code-label {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 26px 0 -16px 4px;
  display: block;
}

/* ---- Callouts ---- */
.callout {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 28px 0;
  background: var(--surface);
}
.callout .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.callout.aha   { border-color: rgba(118,185,0,0.3); background: linear-gradient(180deg, rgba(118,185,0,0.06), transparent); }
.callout.warn  { border-color: rgba(255,157,77,0.3); background: rgba(255,157,77,0.05); }
.callout.warn .tag { color: var(--accent-warn); }
.callout.biz   { border-color: rgba(0,212,255,0.3); background: rgba(0,212,255,0.04); }
.callout.biz .tag { color: var(--accent-2); }

/* ---- Stat cards ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
  gap: 14px;
  margin: 28px 0;
}
.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  background: var(--surface);
}
.stat .num {
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat .label {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 6px;
}

/* ---- Day card grid (index) ---- */
.daygrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 36px 0;
}
.daycard {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--surface);
  transition: border-color .2s, transform .2s;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.daycard:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  background: var(--surface-2);
}
.daycard .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.14em;
}
.daycard h3 {
  margin: 8px 0 4px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.daycard p {
  font-size: 14px;
  color: var(--text-dim);
  margin: 6px 0 0;
}

/* ---- Pager ---- */
.pager {
  display: flex; justify-content: space-between; align-items: stretch;
  gap: 12px;
  margin-top: 64px;
  border-top: 1px solid var(--border);
  padding-top: 28px;
}
.pager a {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
}
.pager a:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface); }
.pager a small {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.pager a.next { text-align: right; }
.pager a.disabled { opacity: 0.4; pointer-events: none; }

/* ---- Progress strip ---- */
.progress {
  display: flex; gap: 4px;
  margin: 14px 0 0;
}
.progress span {
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
}
.progress span.done { background: var(--accent); }
.progress span.curr { background: var(--accent-2); box-shadow: 0 0 10px var(--accent-2); }

/* ---- Tables ---- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
}
tbody tr:hover { background: rgba(255,255,255,0.02); }
td.num, th.num { text-align: right; font-family: var(--mono); }

/* ---- Diagram ---- */
.diagram {
  margin: 28px 0;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
}
.diagram svg { max-width: 100%; height: auto; }
.diagram .caption {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* ---- Footer ---- */
footer {
  max-width: var(--max-wide);
  margin: 80px auto 40px;
  padding: 24px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 12px 18px;
  background: var(--accent);
  color: #0a0a0b;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--sans);
  font-size: 14px;
  text-decoration: none;
  transition: transform .15s, background .15s;
}
.btn:hover { background: #8ad400; transform: translateY(-1px); border: none; }
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn.ghost:hover { background: var(--surface); }

/* ---- Inline keys ---- */
kbd {
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--surface);
  color: var(--text);
}

/* ---- Speed bars (used on multiple days) ---- */
.speedbars { margin: 24px 0; }
.speedbar {
  display: grid;
  grid-template-columns: 140px 1fr 80px;
  align-items: center;
  gap: 14px;
  margin: 8px 0;
  font-size: 14px;
}
.speedbar .label { color: var(--text-dim); font-family: var(--mono); font-size: 12px; }
.speedbar .track {
  height: 18px;
  background: var(--surface);
  border-radius: 4px;
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}
.speedbar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 3px;
}
.speedbar .fill.cpu { background: linear-gradient(90deg, #555, #888); }
.speedbar .num { font-family: var(--mono); color: var(--text); text-align: right; font-size: 13px; }

/* responsive */
@media (max-width: 640px) {
  main { padding: 36px 18px 80px; }
  .topnav-inner { padding: 12px 16px; }
  .dayhop { display: none; }
  h1 { font-size: 34px; }
  .speedbar { grid-template-columns: 100px 1fr 70px; }
}