/* Shajarah site: the look of the presentation deck. Charcoal, one orange, warm gray panels,
   letter-spaced section tags and diagonal stripes. Shared by every page, in both languages
   (logical properties, so right-to-left pages mirror by themselves). */

:root {
  color-scheme: light;
  --bg: #ffffff;
  --panel: #f2f1ee;
  --peach: #fdeee4;
  --ink: #2b2b29;          /* headings, dark panels */
  --text: #393835;
  --muted: #6b6963;
  --line: #e2e0da;
  --orange: #e8590c;       /* marks, bars, big numbers */
  --orange-text: #c2410c;  /* orange at text sizes (4.5:1 on white) */
  --dark: #2b2b29;         /* dark panels */
  --on-dark: #f4f3ef;
  --on-dark-muted: #c9c6bd;
  --on-dark-accent: #f4a582;
  --stripe-b: #2b2b29;
  /* charts */
  --series-tcp: #948f86;   /* context: the old way */
  --series-quic: #e8590c;  /* the story */
  --grid: #e6e4de;
  --axis: #c3c2b7;
  --critical: #d03b3b;
  --warning: #fab219;
  --good: #0ca30c;
  --net-wifi0: #2a78d6;
  --net-cell0: #2b2b29;
  --net-sat0: #1baf7a;
  --outage: rgba(43, 43, 41, 0.07);
  --push-burst: #c9c6bd;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  --r: 10px;               /* cards and panels, as on the first version of the site */
  --r-sm: 7px;             /* buttons, tags, tiles */
  --sans: "Helvetica Neue", Helvetica, Arial, "Liberation Sans", system-ui, sans-serif;
  --arabic: "Beiruti", "Noto Naskh Arabic", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1a1a19; --panel: #242422; --peach: #33251c; --ink: #f2f1ee; --text: #dcdad3;
    --muted: #a3a097; --line: #34332f; --orange-text: #f08a4f; --dark: #111110;
    --on-dark: #f2f1ee; --on-dark-muted: #b3b0a7; --stripe-b: #111110;
    --series-tcp: #8a867d; --grid: #2e2d2a; --axis: #45443f; --net-cell0: #e6e4dd;
    --outage: rgba(255, 255, 255, 0.07); --push-burst: #55544f; --shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1a1a19; --panel: #242422; --peach: #33251c; --ink: #f2f1ee; --text: #dcdad3;
  --muted: #a3a097; --line: #34332f; --orange-text: #f08a4f; --dark: #111110;
  --on-dark: #f2f1ee; --on-dark-muted: #b3b0a7; --stripe-b: #111110;
  --series-tcp: #8a867d; --grid: #2e2d2a; --axis: #45443f; --net-cell0: #e6e4dd;
  --outage: rgba(255, 255, 255, 0.07); --push-burst: #55544f; --shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}
:lang(ar) body, body:lang(ar) { font: 19px/1.8 var(--arabic); }
/* The deck's orange bar down the side of every content slide. */
body::before {
  content: ""; position: fixed; inset-block: 0; inset-inline-start: 0; width: 10px;
  background: var(--orange); z-index: 20;
}
@media (max-width: 700px) { body::before { width: 5px; } }
a { color: var(--orange-text); }
img, svg { max-width: 100%; }
.wrap { max-width: 1180px; margin: 0 auto; padding-inline: 16px; }
@media (min-width: 700px) { .wrap { padding-inline: 40px; } }
[lang="en"] { unicode-bidi: isolate; }
.ltr { direction: ltr; unicode-bidi: isolate; display: inline-block; }

/* ------------------------------------------------------------------ top bar */
.topnav { background: var(--dark); color: var(--on-dark); border-bottom: 3px solid var(--orange); }
.topnav .wrap { display: flex; align-items: center; gap: 18px; height: 52px; }
.topnav .brand { font: 800 1.45rem/1 var(--arabic); color: var(--orange); text-decoration: none; flex: none; margin-inline-end: auto; }
.topnav .links {
  display: flex; gap: 16px; overflow-x: auto; white-space: nowrap; scrollbar-width: none;
  flex: 1; min-width: 0; font-size: 0.8rem; letter-spacing: 0.03em;
}
.topnav .links { gap: 14px; }
.topnav .links::-webkit-scrollbar { display: none; }
.topnav .links a { color: var(--on-dark-muted); text-decoration: none; padding: 14px 0 12px; border-bottom: 2px solid transparent; }
.topnav .links a:hover { color: var(--on-dark); }
.topnav .links a.active { color: var(--on-dark); border-bottom-color: var(--orange); }
.topnav .links a b { color: var(--on-dark-accent); font-weight: 600; margin-inline-end: 5px; }
.lang {
  flex: none; font-size: 0.85rem; color: var(--on-dark); text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.3); border-radius: 999px; padding: 3px 12px;
}
.lang:lang(ar) { font-family: var(--arabic); font-size: 1rem; }
.lang:hover { border-color: var(--orange); }
.navbtn { flex: none; font-size: 0.82rem; font-weight: 700; color: #fff; background: var(--orange); text-decoration: none; padding: 5px 14px; border-radius: 999px; white-space: nowrap; }
@media (max-width: 600px) { .navbtn { display: none; } }

/* ------------------------------------------------------------------ title slide */
.hero { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); background: var(--bg); }
.hero .dark {
  position: relative; background: var(--dark); color: var(--on-dark);
  padding: 72px 40px 72px; padding-inline-start: max(40px, calc((100vw - 1180px) / 2 + 40px));
}
.hero .kicker { font-size: 0.85rem; font-weight: 700; letter-spacing: 0.3em; color: var(--on-dark-accent); text-transform: uppercase; margin: 0 0 32px; }
.hero .wordmark { font: 800 clamp(4.5rem, 12vw, 7.5rem)/1 var(--arabic); color: var(--orange); margin: 0; }
.hero .name { font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 700; color: #fff; margin: 4px 0 20px; line-height: 1.1; }
.hero .tagline { font-size: 1.3rem; color: var(--on-dark-muted); max-width: 30em; margin: 0 0 32px; }
.hero .side { padding: 72px 40px 40px; display: flex; flex-direction: column; gap: 28px; justify-content: center; }
.hero .side h2 { font-size: 0.85rem; letter-spacing: 0.3em; color: var(--orange-text); text-transform: uppercase; margin: 0 0 12px; }
.hero .team { list-style: none; padding: 0; margin: 0; font-size: 1.7rem; color: var(--ink); line-height: 1.7; }
.hero .glance { display: grid; gap: 10px; }
.hero .glance div { background: var(--peach); padding: 10px 14px; border-inline-start: 4px solid var(--orange); border-radius: var(--r-sm); }
.hero .glance b { display: block; font-size: 1.45rem; color: var(--orange-text); line-height: 1.2; }
.hero .glance span { font-size: 0.9rem; color: var(--text); }
@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .hero .dark { padding: 48px 20px 52px; }
  .hero .side { padding: 32px 20px 8px; }
}

.buttons { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-block; padding: 10px 18px; font-weight: 600; font-size: 0.95rem; text-decoration: none;
  border: 2px solid var(--orange); color: var(--on-dark); background: transparent; border-radius: var(--r-sm);
}
.btn.primary { background: var(--orange); color: #fff; }
.btn:hover { filter: brightness(1.08); }
.btn.light { color: var(--ink); }

/* ------------------------------------------------------------------ contents */
.page { max-width: 1400px; margin: 0 auto; }
nav.toc {
  position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line);
  display: flex; gap: 18px; overflow-x: auto; white-space: nowrap; scrollbar-width: none;
  padding: 10px 16px; font-size: 0.88rem;
}
nav.toc::-webkit-scrollbar { display: none; }
nav.toc a { color: var(--muted); text-decoration: none; padding: 2px 0; border-bottom: 2px solid transparent; }
nav.toc a b { color: var(--orange-text); font-weight: 700; margin-inline-end: 6px; font-size: 0.85em; }
nav.toc a:hover { color: var(--ink); }
nav.toc a.active { color: var(--ink); border-bottom-color: var(--orange); }
@media (min-width: 1180px) {
  .page { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 8px; padding-inline-start: 24px; }
  nav.toc {
    align-self: start; top: 24px; margin-top: 72px; flex-direction: column; gap: 2px; padding: 0;
    border: 0; background: none; overflow: visible; white-space: normal; font-size: 0.9rem;
  }
  nav.toc a { padding: 5px 0; padding-inline-start: 14px; border-bottom: 0; border-inline-start: 2px solid var(--line); }
  nav.toc a.active { border-inline-start-color: var(--orange); }
  .page .wrap { padding-inline: 32px 40px; }
  .page .slide { scroll-margin-top: 16px; }
}

/* ------------------------------------------------------------------ slides */
.slide { position: relative; padding: 72px 0 40px; scroll-margin-top: 56px; }
.slide::after { /* stripe patch in the top corner, as on the deck */
  content: ""; position: absolute; top: 0; inset-inline-end: 0; width: min(240px, 40vw); height: 18px;
  background: repeating-linear-gradient(-55deg, var(--orange) 0 8px, var(--stripe-b) 8px 16px);
}
.slide + .slide { border-top: 1px solid var(--line); }
.tag {
  display: inline-block; background: var(--dark); color: #fff; font-size: 0.82rem; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase; padding: 8px 18px; margin: 0 0 18px; border-radius: var(--r-sm);
}
:lang(ar) .tag { letter-spacing: 0; font-size: 1rem; }
h2.title { font-size: clamp(1.9rem, 4vw, 2.7rem); line-height: 1.15; color: var(--ink); margin: 0 0 28px; letter-spacing: -0.01em; }
:lang(ar) h2.title { letter-spacing: 0; }
h3 { font-size: 1.3rem; color: var(--orange-text); margin: 28px 0 8px; line-height: 1.3; }
h3:first-child { margin-top: 0; }
h4 { font-size: 1.05rem; color: var(--ink); margin: 20px 0 6px; }
p { margin: 0 0 14px; }
.lede { font-size: 1.15rem; color: var(--text); max-width: 60em; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.label { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
:lang(ar) .label { letter-spacing: 0; font-size: 0.95rem; }
ul.clean { list-style: none; padding: 0; margin: 0 0 14px; }
ul.dash { padding-inline-start: 20px; margin: 0 0 14px; }
ul.dash li, ol.steps li { margin-bottom: 8px; }
ol.steps { padding-inline-start: 22px; margin: 0 0 14px; }
ol.steps li::marker { color: var(--orange-text); font-weight: 700; }

.cols { display: grid; gap: 28px; }
.cols.two { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
.card table th, .card table td { padding: 7px 8px; }
.card table { font-size: 0.86rem; }
.cols.halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cols.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) { .cols.two, .cols.halves, .cols.three { grid-template-columns: minmax(0, 1fr); } }

.card { background: var(--panel); padding: 24px 26px; border-radius: var(--r); }
.card.dark { background: var(--dark); color: var(--on-dark); }
.card.dark h3, .card.dark > .num { color: var(--orange); }
.card.dark table { font-size: 0.9rem; }
.card.dark thead th { background: transparent; color: var(--on-dark-accent); border-bottom: 1px solid rgba(255,255,255,0.25); }
.card.dark td { color: var(--on-dark); border-bottom-color: rgba(255,255,255,0.12); }
.card.dark .label { color: var(--on-dark-accent); }
.card.dark p { color: var(--on-dark-muted); }
.card.dark strong.hl { color: var(--orange); }
.card.peach { background: var(--peach); }
.card > .num { font-size: clamp(2.8rem, 6vw, 4.2rem); font-weight: 800; color: var(--orange); line-height: 1; margin: 6px 0 12px; }
.card .big-label { font-size: 1.15rem; color: var(--on-dark); margin: 0 0 14px; }
.card h4 { margin-top: 0; }

/* Solutions: icon, name, text, strength/limitation */
.sol .head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.sol .icon { width: 52px; height: 52px; border-radius: 50%; background: var(--peach); display: grid; place-items: center; flex: none; color: var(--orange); }
.sol .icon svg { width: 26px; height: 26px; }
.sol h3 { margin: 0; color: var(--ink); }
.sol .pm { border-top: 1px solid var(--line); padding-top: 12px; margin-top: 16px; font-size: 0.95rem; }
.sol .pm p { margin-bottom: 8px; }
.sol .plus b { color: var(--orange-text); }
.sol .minus b { color: var(--ink); }

/* Numbered idea cards with arrows between them */
.ideas { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr); align-items: stretch; gap: 10px; }
.ideas .arrow { align-self: center; color: var(--orange); font-size: 1.6rem; }
:lang(ar) .ideas .arrow, :lang(ar) .flow .arrow { transform: scaleX(-1); }
.ideas .n { font-size: 3.2rem; font-weight: 800; color: var(--orange); line-height: 1; margin-bottom: 10px; }
.ideas h3 { color: var(--ink); margin: 0 0 10px; font-size: 1.4rem; }
.ideas .card.dark h3 { color: #fff; }
@media (max-width: 900px) {
  .ideas { grid-template-columns: minmax(0, 1fr); }
  .ideas .arrow { transform: rotate(90deg); justify-self: center; }
  :lang(ar) .ideas .arrow { transform: rotate(90deg); }
}

/* The model: five columns with headers */
.flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.flow .col { display: flex; flex-direction: column; background: var(--panel); position: relative; border-radius: var(--r); }
.flow .col header { padding: 18px 14px; text-align: center; background: #d6d3cb; color: var(--ink); min-height: 92px; display: flex; flex-direction: column; justify-content: center; border-radius: var(--r) var(--r) 0 0; }
.flow .col header b { font-size: 1.2rem; }
.flow .col header span { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.flow .col.dk header { background: var(--dark); color: #fff; }
.flow .col.dk header span { color: var(--on-dark-muted); }
.flow .col.or header { background: var(--orange); color: #fff; }
.flow .col.or header span { color: #ffe3d3; }
.flow .col.pe header { background: var(--peach); color: #8a2d06; }
.flow .col.pe header span { color: var(--orange-text); }
.flow .col .body { padding: 16px; font-size: 0.95rem; }
.flow .col + .col::before {
  content: "→"; position: absolute; top: 34px; inset-inline-start: -21px; width: 26px; height: 26px; z-index: 2;
  display: grid; place-items: center; border-radius: 50%; background: var(--bg); color: var(--orange);
  border: 2px solid var(--orange); font-size: 0.9rem; font-weight: 700;
}
.flow .col.pe::before { content: "⇄"; }
:lang(ar) .flow .col + .col::before { content: "←"; }
:lang(ar) .flow .col.pe::before { content: "⇄"; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .flow .col header { background: #3a3935; } }
:root[data-theme="dark"] .flow .col header { background: #3a3935; }
@media (max-width: 1000px) {
  .flow { grid-template-columns: minmax(0, 1fr); }
  .flow .col + .col::before { top: -21px; inset-inline-start: calc(50% - 13px); content: "↓"; }
  :lang(ar) .flow .col + .col::before { content: "↓"; }
  .flow .col header { min-height: 0; }
}

/* Prototype diagram */
.diagram { background: var(--panel); padding: 26px; border-radius: var(--r); }
.diagram .row { display: grid; grid-template-columns: 1fr auto 1.1fr auto 1.1fr auto 1.1fr auto 0.8fr; align-items: center; gap: 8px; }
.diagram .box { border: 2px solid var(--ink); background: var(--bg); padding: 14px 10px; text-align: center; min-height: 96px; display: flex; flex-direction: column; justify-content: center; border-radius: var(--r-sm); }
.diagram .box b { font-size: 1.15rem; color: var(--ink); }
.diagram .box span { font-size: 0.85rem; color: var(--muted); }
.diagram .box.dk { background: var(--dark); border-color: var(--dark); }
.diagram .box.dk b { color: #fff; }
.diagram .box.dk span { color: var(--on-dark-muted); }
.diagram .link { text-align: center; font-size: 0.8rem; color: var(--muted); font-weight: 700; }
.diagram .link i { display: block; height: 2px; background: var(--ink); min-width: 28px; margin: 6px 0; position: relative; }
.diagram .tunnel { background: var(--orange); color: #fff; text-align: center; padding: 12px 10px; font-weight: 700; border-radius: var(--r-sm); }
.diagram .tunnel small { display: block; font-weight: 600; color: #ffe3d3; font-size: 0.78rem; }
.diagram .note { margin: 18px 0 0; font-size: 0.95rem; }
.diagram .note b { color: var(--orange-text); }
@media (max-width: 1000px) {
  .diagram .row { grid-template-columns: minmax(0, 1fr); }
  .diagram .link i { width: 2px; height: 22px; min-width: 0; margin: 4px auto; }
}

.built-with { background: var(--dark); color: var(--on-dark-muted); padding: 18px 24px; border-radius: var(--r); display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: baseline; margin-top: 28px; }
.built-with .label { color: var(--on-dark-accent); margin: 0; }
.built-with b { color: var(--orange); font-weight: 700; }

/* Stat tiles in a row */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin: 0 0 28px; }
.stat { padding: 22px 24px; background: var(--peach); border-radius: var(--r); }
.stat.dark { background: var(--dark); }
.stat .num { font-size: clamp(2.4rem, 5vw, 3.4rem); font-weight: 800; color: var(--orange); line-height: 1.05; }
.stat .num small { font-size: 0.45em; font-weight: 700; }
.stat p { margin: 8px 0 0; font-size: 0.95rem; color: #7a3d16; }
.stat.dark p { color: var(--on-dark-muted); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .stat p { color: var(--text); } }
:root[data-theme="dark"] .stat p { color: var(--text); }

/* Tables */
.table-wrap { overflow-x: auto; margin: 10px 0 18px; border-radius: var(--r); }
table { border-collapse: collapse; font-size: 0.93rem; min-width: 100%; }
th, td { text-align: start; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--dark); color: #fff; font-weight: 600; font-size: 0.85rem; border-bottom: 0; }
td.num, th.num { text-align: end; white-space: nowrap; font-variant-numeric: tabular-nums; }
tr.ours td { background: var(--peach); font-weight: 700; }
td .yes { color: var(--orange-text); font-weight: 700; }
caption { caption-side: bottom; text-align: start; color: var(--muted); font-size: 0.85rem; padding-top: 8px; }

/* Charts */
.chart-card { background: var(--bg); border: 1px solid var(--line); padding: 16px 18px 12px; border-radius: var(--r); }
.chart-card h4 { margin: 0 0 4px; }
.chart-card .sub { font-size: 0.85rem; color: var(--muted); margin: 0 0 8px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 0.85rem; color: var(--muted); margin: 6px 0 4px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.key { width: 12px; height: 12px; border-radius: 2px; display: inline-block; flex: none; }
.key.line { height: 3px; }
.key.dot { border-radius: 50%; width: 10px; height: 10px; }
svg.chart { display: block; width: 100%; height: auto; overflow: visible; direction: ltr; }
svg.chart text { fill: var(--muted); font-size: 12px; font-family: var(--sans); }
:lang(ar) svg.chart text { font-family: var(--arabic); font-size: 14px; }
svg.chart text.val { fill: var(--ink); font-weight: 700; font-size: 13px; }
svg.chart text.ink { fill: var(--ink); }
svg.chart .grid { stroke: var(--grid); stroke-width: 1; }
svg.chart .axis { stroke: var(--axis); stroke-width: 1; }
svg.chart .hit { cursor: pointer; }
details.data { margin-top: 6px; font-size: 0.88rem; }
details.data summary { cursor: pointer; color: var(--muted); }
.tooltip {
  position: fixed; pointer-events: none; z-index: 30; max-width: 280px; display: none;
  background: var(--bg); color: var(--text); border: 1px solid var(--line); padding: 7px 10px;
  font-size: 0.85rem; box-shadow: var(--shadow); border-radius: var(--r-sm);
}
.tooltip b { color: var(--ink); }

/* Improvements: four groups, built items tinted */
.map-legend { display: flex; gap: 22px; font-size: 0.95rem; margin: -12px 0 22px; }
.map-legend span { display: inline-flex; align-items: center; gap: 8px; }
.mind { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; }
@media (max-width: 900px) { .mind { grid-template-columns: minmax(0, 1fr); } }
.group { border-radius: var(--r); overflow: hidden; }
.group .gname { background: var(--dark); color: #fff; font-weight: 700; font-size: 1.1rem; padding: 12px 18px; }
.group ul { list-style: none; padding: 0; margin: 4px 0 0; display: grid; gap: 4px; }
.group li { background: var(--panel); padding: 9px 16px; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 14px; align-items: center; }
.group li b { display: block; color: var(--ink); font-size: 0.98rem; }
.group li span { font-size: 0.86rem; color: var(--muted); }
.group li.built { background: var(--peach); }
.group li.built b { color: #8a2d06; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .group li.built b { color: var(--orange-text); } }
:root[data-theme="dark"] .group li.built b { color: var(--orange-text); }
.pip { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--ink); background: transparent; flex: none; display: inline-block; }
.pip.on { background: var(--orange); border-color: var(--orange); }

/* Phases */
.phases { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 28px; }
.phase { background: var(--panel); padding: 18px 20px; position: relative; border-radius: var(--r); }
.phase.done { background: var(--orange); color: #fff; }
.phase .label { color: var(--orange-text); margin-bottom: 6px; }
.phase.done .label { color: #fff; }
.phase h4 { margin: 0 0 6px; font-size: 1.25rem; }
.phase.done h4 { color: #fff; }
.phase p { font-size: 0.93rem; margin: 0; }
@media (max-width: 900px) { .phases { grid-template-columns: minmax(0, 1fr); } }
.guidelines { background: var(--dark); color: var(--on-dark-muted); padding: 24px 26px; border-radius: var(--r); }
.guidelines .label { color: var(--on-dark-accent); }
.guidelines ol { list-style: none; counter-reset: g; padding: 0; margin: 0; }
.guidelines li { counter-increment: g; margin-bottom: 12px; padding-inline-start: 26px; position: relative; }
.guidelines li::before { content: counter(g); position: absolute; inset-inline-start: 0; color: var(--orange); font-weight: 800; }
.guidelines b { color: #fff; }

/* Outage timeline (testing slide) */
.timeline { display: flex; height: 34px; margin: 10px 0 6px; font-size: 0.8rem; font-weight: 700; direction: ltr; border-radius: var(--r-sm); overflow: hidden; }
.timeline div { display: grid; place-items: center; color: #fff; overflow: hidden; white-space: nowrap; }
.timeline .ok { background: var(--series-tcp); }
.timeline .fade { background: repeating-linear-gradient(-55deg, var(--orange) 0 6px, #f4a582 6px 12px); }
.timeline .dead { background: var(--dark); }
.timeline-axis { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--muted); direction: ltr; }

/* Closing slide */
.closing { background: var(--dark); color: var(--on-dark); position: relative; padding: 56px 0 64px; margin-top: 40px; border-top: 3px solid var(--orange); }
.closing .thanks-ar { font: 800 clamp(3.5rem, 9vw, 5.5rem)/1 var(--arabic); color: var(--orange); margin: 0; }
.closing .thanks { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; color: #fff; margin: 6px 0 16px; }
.closing .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 24px; }
.closing a { color: var(--on-dark-accent); }

.callout { border-inline-start: 4px solid var(--orange); background: var(--panel); padding: 14px 18px; margin: 18px 0; border-radius: var(--r-sm); }
.note-inline { font-size: 0.88rem; color: var(--muted); }

/* ------------------------------------------------------------------ replay player */
.controls {
  display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: end;
  background: var(--panel); padding: 14px 16px; margin-bottom: 16px; border-radius: var(--r);
}
.controls label { display: flex; flex-direction: column; font-size: 0.8rem; color: var(--muted); gap: 3px; font-weight: 700; letter-spacing: 0.04em; }
.controls select, .controls button {
  font: inherit; font-size: 0.92rem; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: var(--r-sm); padding: 6px 10px; letter-spacing: 0;
}
.controls select { max-width: 100%; }
.controls button { cursor: pointer; font-weight: 700; }
.controls button.primary { background: var(--orange); border-color: var(--orange); color: #fff; min-width: 84px; }
.timebar { display: flex; align-items: center; gap: 12px; flex: 1 1 320px; min-width: 0; }
.timebar input { flex: 1; min-width: 0; accent-color: var(--orange); }
.clock { font-variant-numeric: tabular-nums; min-width: 92px; text-align: end; white-space: nowrap; font-weight: 700; color: var(--ink); }
.lanes { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 980px) { .lanes.two { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.lane { background: var(--bg); border: 1px solid var(--line); padding: 14px 16px; min-width: 0; border-radius: var(--r); }
.lane h3 { margin: 0 0 2px; color: var(--ink); }
.lane .sub { color: var(--muted); font-size: 0.88rem; margin: 0 0 10px; min-height: 3.1em; }
/* Fixed-size tiles: values change every frame during playback and must never reflow the page. */
.tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 12px; }
@media (max-width: 520px) { .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.tile { background: var(--panel); padding: 8px 10px; height: 64px; overflow: hidden; border-radius: var(--r-sm); }
.tile .k { color: var(--muted); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
:lang(ar) .tile .k { letter-spacing: 0; font-size: 0.85rem; }
.tile .v { font-size: 1.15rem; font-weight: 700; color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-variant-numeric: tabular-nums; }
.tile .v small { font-size: 0.75rem; font-weight: 400; color: var(--muted); }
.status { display: inline-flex; align-items: center; gap: 6px; }
.lane .chart { position: relative; margin-top: 6px; }
.lane .chart .title { font-size: 0.8rem; color: var(--muted); margin: 8px 0 2px; }
.lane svg { display: block; width: 100%; overflow: visible; user-select: none; direction: ltr; }
.lane svg text { fill: var(--muted); font-size: 11px; font-family: var(--sans); }
:lang(ar) .lane svg text { font-family: var(--arabic); font-size: 13px; }
.lane svg .ink { fill: var(--ink); }
.lane svg .grid { stroke: var(--grid); stroke-width: 1; }
.lane svg .cursor { stroke: var(--ink); stroke-width: 1.5; }
.lane svg .outage { fill: var(--outage); }
.lane svg .hit { cursor: pointer; }
@media (max-width: 600px) {
  .controls label { flex: 1 1 100%; }
  .controls label select { width: 100%; }
  .timebar { flex-basis: 100%; }
  .clock { min-width: 0; }
}