/* TpF2 Multiplayer site. Colours come from the TFMP roundel: ink, white, #007BFF. */

@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("assets/fonts/barlow-condensed-600.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("assets/fonts/barlow-condensed-700.woff2") format("woff2");
}

:root {
  --ink: #0b0d10;
  --paper: #f6f5f1;
  --surface: #ffffff;
  --text: #16191d;
  --muted: #5a6068;
  --rule: #dedbd2;
  --rule-strong: #c3bfb3;
  --blue: #007bff;
  --blue-text: #0063cc;
  --track: #cfcbc0;
  --display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", system-ui, sans-serif;
  --body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111316;
    --surface: #181b1f;
    --text: #e8e6e0;
    --muted: #a0a6ad;
    --rule: #272b30;
    --rule-strong: #3a3f45;
    --blue-text: #5aa9ff;
    --track: #3a3f45;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 17px/1.65 var(--body);
}
img, svg { max-width: 100%; }
a { color: var(--blue-text); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
code { font-family: var(--mono); font-size: 0.88em; }

.container { max-width: 1080px; margin: 0 auto; padding-inline: 24px; }
.narrow { max-width: 760px; }

/* ---------- top bar ---------- */
.topbar {
  background: var(--ink);
  color: #fff;
  border-bottom: 3px solid var(--blue);
}
.topbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; }
.brand img { width: 34px; height: 34px; }
.brand span { font: 700 1.35rem/1 var(--display); letter-spacing: 0.01em; }
.topnav { display: flex; gap: 22px; flex-wrap: wrap; }
.topnav a { color: #c9ced6; text-decoration: none; font-size: 0.95rem; }
.topnav a:hover { color: #fff; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}
.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 60% 40%;
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(8, 10, 13, 0.92) 0%, rgba(8, 10, 13, 0.78) 45%, rgba(8, 10, 13, 0.25) 100%),
    linear-gradient(0deg, rgba(8, 10, 13, 0.55) 0%, rgba(8, 10, 13, 0) 40%);
}
.hero .container { padding-block: 72px 80px; }
.hero-mark { width: 96px; height: 96px; display: block; margin-bottom: 20px; }
.hero h1 {
  font: 700 clamp(3rem, 8vw, 5.5rem)/0.95 var(--display);
  margin: 0 0 18px;
  letter-spacing: 0.005em;
}
.hero h1 em { font-style: normal; color: var(--blue); }
.hero .lede { font-size: clamp(1.1rem, 2.2vw, 1.3rem); max-width: 34em; color: #e3e6ea; margin: 0; }
.hero .facts { margin: 22px 0 0; color: #aab1ba; font-size: 0.95rem; }
.buttons { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 4px;
  font: 600 1.15rem/1 var(--display);
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 2px solid var(--blue);
}
.button.solid { background: var(--blue); color: #fff; }
.button.solid:hover { background: #0068d9; border-color: #0068d9; }
.button.ghost { color: #fff; border-color: rgba(255, 255, 255, 0.55); }
.button.ghost:hover { border-color: #fff; }

/* ---------- sections ---------- */
.section { padding-block: 72px; border-bottom: 1px solid var(--rule); }
.section:last-of-type { border-bottom: 0; }
.section h2 {
  font: 700 clamp(2rem, 4.5vw, 2.75rem)/1.05 var(--display);
  margin: 0 0 18px;
}
.section h3 {
  font: 600 1.45rem/1.15 var(--display);
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}
.section p { margin: 0 0 14px; }
.intro { font-size: 1.12rem; color: var(--muted); max-width: 40em; margin-bottom: 40px; }

.points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 2px solid var(--text);
}
.points > div { padding: 20px 24px 4px 0; }
.points > div + div { padding-left: 24px; border-left: 1px solid var(--rule); }
.points p { color: var(--muted); }
@media (max-width: 760px) {
  .points { grid-template-columns: 1fr; }
  .points > div, .points > div + div { padding: 18px 0 2px; border-left: 0; }
  .points > div + div { border-top: 1px solid var(--rule); }
}

/* ---------- diagram ---------- */
.figure { margin: 8px 0 0; }
.figure .scroll { overflow-x: auto; }
.figure svg { display: block; width: 100%; min-width: 640px; height: auto; }
.figure figcaption { color: var(--muted); font-size: 0.95rem; margin-top: 14px; max-width: 46em; }
.dg-track { stroke: var(--track); stroke-width: 6; stroke-linecap: round; }
.dg-held { stroke: var(--blue); stroke-width: 6; stroke-linecap: round; opacity: 0.35; }
.dg-label { fill: var(--text); font: 600 20px var(--display); }
.dg-note { fill: var(--muted); font: 14px var(--body); }
.dg-step { stroke: var(--blue); stroke-width: 2; stroke-dasharray: 6 6; }
.dg-steplabel { fill: var(--blue-text); font: 600 17px var(--display); }
.dg-msg { stroke: var(--muted); stroke-width: 1.5; fill: none; stroke-dasharray: 4 4; }
.dg-arrow { fill: var(--muted); }
.dg-click { fill: var(--surface); stroke: var(--text); stroke-width: 3; }
.dg-recv { fill: var(--surface); stroke: var(--muted); stroke-width: 2; }
.dg-apply { fill: var(--blue); stroke: var(--surface); stroke-width: 3; }
.dg-axis { stroke: var(--rule-strong); stroke-width: 1; }

/* ---------- download ---------- */
.download-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 48px; align-items: start; }
@media (max-width: 860px) { .download-grid { grid-template-columns: 1fr; gap: 28px; } }
.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.steps li { counter-increment: step; position: relative; padding: 0 0 22px 52px; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -2px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  border: 2px solid var(--blue);
  font: 700 1.1rem/30px var(--display);
  text-align: center;
}
@media (prefers-color-scheme: dark) { .steps li::before { background: var(--surface); } }
.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--blue);
  padding: 22px 24px;
}
.panel dl { margin: 0; }
.panel dt { font: 600 1.05rem/1.2 var(--display); letter-spacing: 0.02em; color: var(--muted); margin-top: 14px; }
.panel dt:first-child { margin-top: 0; }
.panel dd { margin: 2px 0 0; }
.panel .button { margin-top: 20px; }

.notice {
  border-left: 3px solid var(--blue);
  padding: 4px 0 4px 18px;
  color: var(--muted);
  max-width: 46em;
}

/* ---------- document pages ---------- */
.page-head { background: var(--ink); color: #fff; }
.page-head .container { padding-block: 48px 44px; }
.page-head h1 { font: 700 clamp(2.4rem, 6vw, 3.6rem)/1 var(--display); margin: 0 0 12px; }
.page-head p { color: #c7ccd3; margin: 0; max-width: 40em; }
.doc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding-block: 56px 72px; }
.doc > * { min-width: 0; }   /* a wide table scrolls inside its own box instead of widening the column */
@media (max-width: 900px) { .doc { grid-template-columns: 1fr; gap: 24px; } .toc { position: static !important; } }
.toc { position: sticky; top: 24px; align-self: start; font-size: 0.95rem; }
.toc strong { display: block; font: 600 1.05rem var(--display); letter-spacing: 0.02em; color: var(--muted); margin-bottom: 8px; }
.toc ol { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--rule); }
.toc li a { display: block; padding: 4px 0 4px 14px; color: var(--text); text-decoration: none; }
.toc li a:hover { color: var(--blue-text); }
.doc article { max-width: 720px; }
.doc article h2 { font: 700 1.9rem/1.1 var(--display); margin: 44px 0 12px; scroll-margin-top: 20px; }
.doc article h2:first-child { margin-top: 0; }
.doc article ul { padding-left: 1.2em; }
.doc article li { margin-bottom: 8px; }
.table-scroll { overflow-x: auto; margin: 18px 0; }
table { border-collapse: collapse; width: 100%; min-width: 620px; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 12px 14px 12px 0; border-bottom: 1px solid var(--rule); }
th { font: 600 1.05rem var(--display); letter-spacing: 0.02em; border-bottom: 2px solid var(--text); }

/* ---------- footer ---------- */
.footer { background: var(--ink); color: #9aa1aa; font-size: 0.92rem; }
.footer .container { display: flex; gap: 20px; align-items: flex-start; padding-block: 36px 44px; flex-wrap: wrap; }
.footer img { width: 40px; height: 40px; flex: none; }
.footer p { margin: 0 0 6px; max-width: 52em; }
.footer a { color: #d6dae0; }