/* =========================================================
   ICPAIAS 2027 — Site stylesheet
   Theme: From Digital Reasoning (teal/blue) to
          Real-World Autonomous Action (signal orange)
   ========================================================= */

:root {
  /* Colour tokens */
  --ink: #0a0f1e;
  --ink-2: #111934;
  --ink-3: #1b2548;
  --text: #1b2133;
  --muted: #586078;
  --line: #e2e6ef;
  --line-strong: #cdd3e1;
  --bg: #ffffff;
  --bg-soft: #f4f6fb;
  --bg-tint: #eef3ff;

  --brand: #1f47c7;          /* links, secondary buttons */
  --brand-dark: #16338f;
  --digital: #22b5c4;        /* digital reasoning */
  --physical: #ff5a1f;       /* real-world action */
  --physical-dark: #d9440e;
  --success: #138a5b;
  --warn: #b7791f;

  --grad: linear-gradient(90deg, var(--digital) 0%, #5b7cff 48%, var(--physical) 100%);

  /* Type */
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --container: 1180px;
  --gutter: 16px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(10, 15, 30, .06), 0 8px 24px rgba(10, 15, 30, .06);
  --shadow-lg: 0 20px 50px rgba(10, 15, 30, .14);
  --header-h: 68px;
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}
img, svg, canvas { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--brand-dark); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 .6em;
  letter-spacing: -.01em;
}
h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1.05rem; font-weight: 600; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.25em; margin: 0 0 1em; }
li { margin-bottom: .35em; }
strong { color: var(--ink); }
:focus-visible { outline: 3px solid var(--physical); outline-offset: 2px; border-radius: 4px; }
::selection { background: #ffd7c7; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 1000;
  background: var(--physical); color: #fff; padding: 10px 16px; border-radius: 8px;
  font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 12px; color: #fff; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 768px) { :root { --gutter: 28px; } }

/* ---------- Top info bar ---------- */
.topbar {
  background: var(--ink);
  color: #c9d1e8;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
}
.topbar .container {
  display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; justify-content: space-between;
  min-height: 36px; padding-top: 6px; padding-bottom: 6px;
}
.topbar span { white-space: nowrap; }
.topbar .dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--physical); margin-right: 8px; vertical-align: middle; }
.topbar a { color: #fff; text-decoration: none; }
.topbar a:hover { text-decoration: underline; color: #fff; }
.topbar .tb-theme { display: none; }
@media (min-width: 900px) { .topbar .tb-theme { display: inline; } }

/* ---------- Header / navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; gap: 16px; min-height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); flex-shrink: 0; }
.brand img { width: 38px; height: 38px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-family: var(--font-display); font-size: 1.12rem; letter-spacing: .02em; }
.brand-text small { font-family: var(--font-mono); font-size: .66rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }

.nav-toggle {
  margin-left: auto; display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border: 1px solid var(--line-strong); border-radius: 10px;
  background: #fff; cursor: pointer; color: var(--ink);
}
.nav-toggle svg { width: 22px; height: 22px; }
.nav-toggle .icon-close { display: none; }
.nav-open .nav-toggle .icon-close { display: block; }
.nav-open .nav-toggle .icon-open { display: none; }

.main-nav { display: none; }
.nav-open .main-nav {
  display: block; position: fixed; inset: calc(var(--header-h) + 1px) 0 0 0;
  background: #fff; overflow-y: auto; padding: 12px var(--gutter) 40px; border-top: 1px solid var(--line);
}
.main-nav ul { list-style: none; margin: 0; padding: 0; }
.main-nav li { margin: 0; }
.main-nav a, .main-nav .dd-btn {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  padding: 12px 4px; font: 500 1rem var(--font-body); color: var(--ink); text-decoration: none;
  background: none; border: 0; border-bottom: 1px solid var(--line); cursor: pointer; text-align: left;
}
.main-nav a[aria-current="page"], .main-nav .dd.is-active > .dd-btn { color: var(--physical-dark); }
.dd-btn svg { width: 14px; height: 14px; transition: transform .2s; }
.dd-btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.dd-menu { display: none; padding-left: 14px !important; }
.dd-btn[aria-expanded="true"] + .dd-menu { display: block; }
.dd-menu a { font-size: .95rem; color: var(--muted); }
.site-header .nav-cta { display: none; }
.main-nav .nav-cta-mobile { margin-top: 18px; display: grid; gap: 10px; }
.main-nav .nav-cta-mobile a { justify-content: center; border: 0; }

@media (min-width: 1100px) {
  .nav-toggle { display: none; }
  .main-nav { display: block; margin-left: auto; }
  .main-nav > ul { display: flex; align-items: center; gap: 2px; }
  .main-nav a, .main-nav .dd-btn {
    border: 0; padding: 8px 9px; font-size: .92rem; border-radius: 8px; width: auto; gap: 4px; white-space: nowrap;
  }
  .main-nav > ul > li:first-child { display: none; } /* logo links home on desktop */
  .main-nav > ul > li > a:hover, .main-nav .dd-btn:hover { background: var(--bg-soft); }
  .main-nav a[aria-current="page"] { color: var(--physical-dark); }
  .dd { position: relative; }
  .dd-menu {
    position: absolute; top: calc(100% + 6px); left: -8px; min-width: 240px;
    background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-lg);
    padding: 8px !important;
  }
  .dd:hover > .dd-menu, .dd:focus-within > .dd-menu { display: block; }
  .dd:hover > .dd-btn svg { transform: rotate(180deg); }
  .dd-menu a { display: block; padding: 9px 12px; color: var(--text); }
  .dd-menu a:hover { background: var(--bg-soft); color: var(--ink); }
  .site-header .nav-cta { display: inline-flex; margin-left: 10px; }
  .main-nav .nav-cta-mobile { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font: 600 .95rem var(--font-body);
  text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s, background .2s, box-shadow .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--physical); color: #fff; box-shadow: 0 6px 18px rgba(255, 90, 31, .32); }
.btn-primary:hover { background: var(--physical-dark); color: #fff; }
.btn-secondary { background: var(--brand); color: #fff; }
.btn-secondary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { color: var(--ink); }
.btn-outline-light { border-color: rgba(255, 255, 255, .45); color: #fff; }
.btn-outline-light:hover { border-color: #fff; color: #fff; background: rgba(255, 255, 255, .08); }
.btn-sm { padding: 8px 16px; font-size: .88rem; }
.btn[aria-disabled="true"] { opacity: .6; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Hero (home) ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: radial-gradient(1200px 500px at 85% 20%, rgba(255, 90, 31, .22), transparent 60%),
              radial-gradient(900px 500px at 5% 80%, rgba(34, 181, 196, .22), transparent 60%),
              var(--ink);
}
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .9; }
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(90deg, transparent 35%, #000 85%);
  -webkit-mask-image: linear-gradient(90deg, transparent 35%, #000 85%);
}
.hero .container { position: relative; z-index: 2; padding-top: 72px; padding-bottom: 72px; }
@media (min-width: 900px) { .hero .container { padding-top: 110px; padding-bottom: 100px; } }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase;
  color: #9fb0da; margin-bottom: 18px;
}
.eyebrow .pill { border: 1px solid rgba(255, 255, 255, .25); border-radius: 999px; padding: 4px 12px; color: #fff; }
.hero h1 { color: #fff; max-width: 17ch; margin-bottom: .35em; }
.hero h1 .acr { display: block; font-size: .5em; letter-spacing: .12em; color: #9fb0da; margin-bottom: .5em; font-weight: 500; }
.theme-line {
  font-family: var(--font-display); font-size: clamp(1.1rem, 2.2vw, 1.5rem); font-weight: 500;
  max-width: 40ch; margin-bottom: 28px; color: #e4e9f7;
}
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 14px 28px; margin: 0 0 32px; padding: 0; list-style: none; }
.hero-meta li { display: flex; align-items: center; gap: 10px; margin: 0; color: #dbe2f5; }
.hero-meta svg { width: 20px; height: 20px; color: var(--physical); flex-shrink: 0; }

.countdown {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; max-width: 460px; margin-top: 40px;
}
.countdown div {
  border: 1px solid rgba(255, 255, 255, .16); border-radius: 12px; padding: 12px 8px; text-align: center;
  background: rgba(255, 255, 255, .04);
}
.countdown b { display: block; font: 700 clamp(1.5rem, 4vw, 2.1rem) var(--font-display); color: #fff; font-variant-numeric: tabular-nums; }
.countdown span { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: #9fb0da; }
.countdown-label { font-family: var(--font-mono); font-size: .75rem; color: #9fb0da; letter-spacing: .08em; text-transform: uppercase; margin: 36px 0 -28px; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  position: relative; overflow: hidden; color: #fff;
  background: radial-gradient(800px 300px at 90% 0%, rgba(255, 90, 31, .25), transparent 60%),
              radial-gradient(700px 300px at 0% 100%, rgba(34, 181, 196, .2), transparent 60%),
              var(--ink);
}
.page-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(90deg, transparent 40%, #000);
  -webkit-mask-image: linear-gradient(90deg, transparent 40%, #000);
}
.page-hero .container { position: relative; z-index: 1; padding-top: 48px; padding-bottom: 48px; }
@media (min-width: 900px) { .page-hero .container { padding-top: 72px; padding-bottom: 64px; } }
.page-hero h1 { color: #fff; font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: .3em; max-width: 24ch; }
.page-hero p { color: #cdd6ee; max-width: 62ch; font-size: 1.08rem; margin: 0; }
.breadcrumb { font-family: var(--font-mono); font-size: .78rem; color: #9fb0da; margin-bottom: 14px; letter-spacing: .03em; }
.breadcrumb a { color: #cdd6ee; text-decoration: none; }
.breadcrumb a:hover { color: #fff; text-decoration: underline; }
.page-hero .track-no { font: 700 .85rem var(--font-mono); color: var(--physical); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 8px; }

/* ---------- Sections ---------- */
.section { padding: 64px 0; }
@media (min-width: 900px) { .section { padding: 88px 0; } }
.section-soft { background: var(--bg-soft); }
.section-tint { background: var(--bg-tint); }
.section-dark { background: var(--ink); color: #cdd6ee; }
.section-dark h2, .section-dark h3, .section-dark strong { color: #fff; }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker {
  display: inline-block; font: 600 .76rem var(--font-mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--physical-dark); margin-bottom: 10px;
}
.section-dark .kicker { color: var(--physical); }
.lead { font-size: 1.12rem; color: var(--muted); }
.section-dark .lead { color: #aeb9d8; }
.prose { max-width: 760px; }
.prose h2 { margin-top: 1.6em; }
.prose h3 { margin-top: 1.4em; }
.prose > :first-child { margin-top: 0; }

/* Two-column layout with sticky sidebar */
.layout-side { display: grid; gap: 40px; }
.layout-side > *, .grid > * { min-width: 0; }
@media (min-width: 1000px) {
  .layout-side { grid-template-columns: minmax(0, 1fr) 300px; gap: 56px; }
  .layout-side aside { position: sticky; top: calc(var(--header-h) + 24px); align-self: start; }
}

/* ---------- Grids & cards ---------- */
.grid { display: grid; gap: 20px; }
@media (min-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); position: relative;
}
.card h3 { margin-bottom: .4em; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card-link { text-decoration: none; color: inherit; display: block; transition: transform .2s, box-shadow .2s, border-color .2s; }
.card-link:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--line-strong); color: inherit; }
.card .icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 16px;
  background: var(--bg-tint); color: var(--brand);
}
.card .icon svg { width: 22px; height: 22px; }
.card-accent { overflow: hidden; }
.card-accent::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--grad); }

/* Track cards */
.track-card { display: flex; flex-direction: column; height: 100%; }
.track-card .num {
  font: 700 .78rem var(--font-mono); letter-spacing: .12em; color: var(--physical-dark); margin-bottom: 10px;
}
.track-card h3 { font-size: 1.12rem; }
.track-card p { color: var(--muted); font-size: .95rem; flex: 1; }
.track-card .more { font-weight: 600; font-size: .9rem; color: var(--brand); display: inline-flex; align-items: center; gap: 6px; margin-top: 8px; }
.track-card:hover .more { color: var(--physical-dark); }
.track-card .more svg { width: 16px; height: 16px; transition: transform .2s; }
.track-card:hover .more svg { transform: translateX(3px); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 900px) { .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stats div { background: #fff; padding: 22px 20px; }
.stats b { display: block; font: 700 2rem var(--font-display); color: var(--ink); line-height: 1.1; }
.stats span { color: var(--muted); font-size: .92rem; }

/* ---------- Key dates ---------- */
.dates { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.dates li {
  display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: center; margin: 0;
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; position: relative;
}
.dates .d-name { font-weight: 500; color: var(--ink); }
.dates .d-date { font: 600 .9rem var(--font-mono); color: var(--brand); text-align: right; white-space: nowrap; }
.dates .d-tag { grid-column: 1 / -1; font: 600 .7rem var(--font-mono); letter-spacing: .1em; text-transform: uppercase; display: none; }
.dates li.is-past { opacity: .55; }
.dates li.is-past .d-date { text-decoration: line-through; color: var(--muted); }
.dates li.is-next { border-color: var(--physical); box-shadow: 0 0 0 3px rgba(255, 90, 31, .12); }
.dates li.is-next .d-tag { display: block; color: var(--physical-dark); }
.dates li.is-event { background: var(--ink); border-color: var(--ink); }
.dates li.is-event .d-name { color: #fff; }
.dates li.is-event .d-date { color: var(--physical); }
@media (max-width: 480px) {
  .dates li { grid-template-columns: 1fr; }
  .dates .d-date { text-align: left; }
}

/* Key date strip (home) */
.date-strip { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 700px) { .date-strip { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1000px) { .date-strip { grid-template-columns: repeat(5, 1fr); } }
.date-strip div { background: #fff; padding: 20px; }
.date-strip b { display: block; font: 700 1.15rem var(--font-display); color: var(--ink); }
.date-strip span { font-size: .88rem; color: var(--muted); }
.date-strip .hl { background: var(--ink); }
.date-strip .hl b { color: var(--physical); }
.date-strip .hl span { color: #cdd6ee; }

/* ---------- Tables ---------- */
.table-wrap { width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { padding: 13px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
thead th {
  background: var(--bg-soft); font: 600 .78rem var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fafbfe; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
td .sub { display: block; font-size: .85rem; color: var(--muted); }

/* ---------- Callouts & badges ---------- */
.callout {
  border-radius: var(--radius); padding: 20px 22px; background: var(--bg-tint); border-left: 4px solid var(--brand);
  margin: 0 0 1.4em;
}
.callout p:last-child { margin-bottom: 0; }
.callout h4 { margin-bottom: .4em; }
.callout-warn { background: #fff7ec; border-left-color: var(--warn); }
.callout-accent { background: #fff3ee; border-left-color: var(--physical); }
.pub-statement {
  font-size: .95rem; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px;
  display: grid; gap: 10px;
}
.pub-statement .label { font: 600 .72rem var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--brand); }
.pub-statement p { margin: 0; }

.badge {
  display: inline-block; font: 600 .7rem var(--font-mono); letter-spacing: .06em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 999px; background: var(--bg-soft); color: var(--muted); border: 1px solid var(--line);
}
.badge-accent { background: #fff0e9; color: var(--physical-dark); border-color: #ffd6c5; }
.badge-brand { background: var(--bg-tint); color: var(--brand); border-color: #d5e0ff; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0 0 1em; }
.tags li { margin: 0; font-size: .85rem; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; color: var(--text); }

/* Check list */
.checklist { list-style: none; padding: 0; }
.checklist li { position: relative; padding-left: 30px; margin-bottom: .7em; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: .3em; width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg-tint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f47c7' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/12px no-repeat;
}
.numlist { counter-reset: n; list-style: none; padding: 0; }
.numlist li { counter-increment: n; position: relative; padding-left: 44px; margin-bottom: 1em; }
.numlist li::before {
  content: counter(n, decimal-leading-zero); position: absolute; left: 0; top: 0;
  font: 700 .8rem var(--font-mono); color: var(--physical-dark); background: #fff0e9; border-radius: 8px; padding: 4px 7px;
}

/* ---------- Flow (review workflow) ---------- */
.flow { list-style: none; padding: 0; margin: 0; counter-reset: s; }
.flow li {
  counter-increment: s; position: relative; margin: 0; padding: 0 0 22px 52px;
}
.flow li::before {
  content: counter(s); position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; font: 700 .85rem var(--font-mono); color: #fff; background: var(--brand);
}
.flow li::after { content: ""; position: absolute; left: 16px; top: 36px; bottom: 2px; width: 2px; background: var(--line-strong); }
.flow li:last-child::after { display: none; }
.flow li:last-child::before { background: var(--physical); }
.flow b { display: block; color: var(--ink); }
.flow span { color: var(--muted); font-size: .94rem; }

/* ---------- Tabs & schedule ---------- */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.tab {
  border: 1.5px solid var(--line-strong); background: #fff; border-radius: 12px; padding: 10px 18px; cursor: pointer;
  font: 600 .95rem var(--font-body); color: var(--ink); text-align: left; line-height: 1.3;
}
.tab small { display: block; font: 500 .74rem var(--font-mono); color: var(--muted); letter-spacing: .04em; }
.tab[aria-selected="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.tab[aria-selected="true"] small { color: var(--physical); }
.tab-panel[hidden] { display: none; }

.schedule { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.schedule li { display: grid; gap: 6px; padding: 16px 18px; border-bottom: 1px solid var(--line); margin: 0; }
.schedule li:last-child { border-bottom: 0; }
@media (min-width: 720px) { .schedule li { grid-template-columns: 130px minmax(0, 1fr) 150px; gap: 20px; align-items: start; } }
.schedule .time { font: 600 .88rem var(--font-mono); color: var(--brand); white-space: nowrap; }
.schedule .what b { color: var(--ink); display: block; }
.schedule .what p { margin: 4px 0 0; color: var(--muted); font-size: .93rem; }
.schedule .where { font-size: .85rem; color: var(--muted); }
@media (min-width: 720px) { .schedule .where { text-align: right; } }
.schedule li.t-keynote { background: #fff8f4; }
.schedule li.t-keynote .time { color: var(--physical-dark); }
.schedule li.t-break { background: var(--bg-soft); }
.schedule li.t-break .what b { font-weight: 500; color: var(--muted); }
.schedule .type { display: inline-block; margin-bottom: 4px; }

/* ---------- Accordion (details) ---------- */
.faq { display: grid; gap: 10px; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 0 18px; }
.faq summary {
  cursor: pointer; list-style: none; padding: 16px 30px 16px 0; font-weight: 600; color: var(--ink); position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 0; top: 12px; font: 400 1.5rem var(--font-display); color: var(--physical-dark);
  transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > div { padding-bottom: 16px; color: var(--muted); }
.faq details > div p:last-child { margin-bottom: 0; }

/* ---------- People (committees, keynotes) ---------- */
.people { display: grid; gap: 18px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.person {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center;
  box-shadow: var(--shadow);
}
.person .avatar {
  width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 14px; overflow: hidden; position: relative;
  background: var(--grad); display: grid; place-items: center; color: #fff; font: 700 1.6rem var(--font-display);
}
.person .avatar img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.person h3 { font-size: 1.02rem; margin-bottom: 4px; }
.person .role { font: 600 .72rem var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--physical-dark); margin-bottom: 6px; }
.person .desig { font-size: .9rem; color: var(--text); margin: 0 0 4px; }
.person .org { font-size: .85rem; color: var(--muted); margin: 0; }
.person-tba { border-style: dashed; box-shadow: none; background: var(--bg-soft); }
.person-tba .avatar { background: #dfe4ef; color: #8a93aa; }
.committee-group { margin-bottom: 56px; }
.committee-group:last-child { margin-bottom: 0; }
.committee-group > h2 { font-size: 1.5rem; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.committee-group .count { font: 600 .75rem var(--font-mono); color: var(--muted); background: var(--bg-soft); border-radius: 999px; padding: 3px 10px; }
.tba-note { border: 1px dashed var(--line-strong); border-radius: var(--radius); padding: 22px; color: var(--muted); background: var(--bg-soft); }
.tba-note p:last-child { margin-bottom: 0; }

.keynote-card { text-align: left; display: flex; flex-direction: column; gap: 8px; }
.keynote-card .slot { font: 600 .74rem var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--physical-dark); }
.keynote-card .when { font: 500 .85rem var(--font-mono); color: var(--muted); margin-top: auto; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--ink); color: #cdd6ee; position: relative; overflow: hidden; }
.cta-band::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 4px; background: var(--grad); }
.cta-band .container { padding-top: 56px; padding-bottom: 56px; display: grid; gap: 24px; align-items: center; }
@media (min-width: 900px) { .cta-band .container { grid-template-columns: 1fr auto; } }
.cta-band h2 { color: #fff; margin-bottom: .3em; }
.cta-band p { margin: 0; }

/* ---------- Theme split (home) ---------- */
.theme-split { display: grid; gap: 16px; align-items: stretch; }
@media (min-width: 900px) { .theme-split { grid-template-columns: 1fr 56px 1fr; } }
.theme-split .side { border-radius: var(--radius); padding: 28px; }
.theme-split .digital { background: linear-gradient(135deg, #e6f8fa, #eef3ff); }
.theme-split .physical { background: linear-gradient(135deg, #fff0e9, #fff8f2); }
.theme-split .digital .kicker { color: #0f7f8a; }
.theme-split .arrow { display: grid; place-items: center; color: var(--muted); }
.theme-split .arrow svg { width: 32px; height: 32px; transform: rotate(90deg); }
@media (min-width: 900px) { .theme-split .arrow svg { transform: none; } }

/* ---------- Footer ---------- */
.site-footer { background: #070b16; color: #9aa6c4; font-size: .93rem; }
.site-footer a { color: #cdd6ee; text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.footer-top { display: grid; gap: 36px; padding: 56px 0 40px; }
@media (min-width: 800px) { .footer-top { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.site-footer h4 { color: #fff; font-size: .82rem; font-family: var(--font-mono); letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.footer-brand p { margin: 14px 0 0; max-width: 36ch; }
.footer-brand .brand-text strong { color: #fff; }
.footer-brand .brand-text small { color: #7f8bab; }
.footer-pub { border-top: 1px solid #1a2240; border-bottom: 1px solid #1a2240; padding: 22px 0; font-size: .86rem; }
.footer-pub strong { color: #cdd6ee; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; padding: 22px 0 30px; font-size: .82rem; }

/* ---------- Misc ---------- */
.back-to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 90; width: 46px; height: 46px; border-radius: 50%;
  border: 0; background: var(--ink); color: #fff; cursor: pointer; display: grid; place-items: center;
  box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity .25s, transform .25s;
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.back-to-top svg { width: 20px; height: 20px; }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }
.no-js .reveal { opacity: 1; transform: none; }

.toc { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.toc h4 { font: 600 .76rem var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { margin: 0; }
.toc a { display: block; padding: 6px 0; color: var(--text); text-decoration: none; font-size: .93rem; border-left: 2px solid transparent; padding-left: 10px; margin-left: -12px; }
.toc a:hover, .toc a.active { color: var(--physical-dark); border-left-color: var(--physical); }
.side-box { margin-top: 18px; }

.map-embed { border: 0; width: 100%; height: 360px; border-radius: var(--radius); background: var(--bg-soft); }
.mt-0 { margin-top: 0 !important; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-0 { margin-bottom: 0 !important; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.center { text-align: center; }
hr.rule { border: 0; height: 1px; background: var(--line); margin: 40px 0; }

.contact-form { display: grid; gap: 14px; }
.contact-form label { font-weight: 600; font-size: .9rem; color: var(--ink); display: grid; gap: 6px; }
.contact-form input, .contact-form select, .contact-form textarea {
  font: inherit; padding: 11px 14px; border: 1.5px solid var(--line-strong); border-radius: 10px; background: #fff; color: var(--text); width: 100%;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-color: var(--brand); outline: none; box-shadow: 0 0 0 3px rgba(31, 71, 199, .15); }
.contact-form textarea { min-height: 130px; resize: vertical; }
.form-note { font-size: .85rem; color: var(--muted); }

@media print {
  .topbar, .site-header, .back-to-top, .hero canvas, .cta-band { display: none !important; }
  .page-hero, .hero { background: none !important; color: #000; }
  .page-hero h1, .hero h1 { color: #000; }
}
.cta-band strong, .hero strong, .page-hero strong { color: #fff; }

/* ---------- Organiser & technical partner ---------- */
.partners {
  display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
}
@media (min-width: 760px) { .partners { grid-template-columns: 1fr 1fr; } }
.partner {
  background: #fff; padding: 18px 22px; display: flex; align-items: center; gap: 18px;
  color: inherit; text-decoration: none; min-width: 0;
}
.partner img { height: 52px; width: auto; max-width: 150px; object-fit: contain; flex-shrink: 0; }
.partner > div { display: grid; gap: 2px; min-width: 0; }
.partner .label { font: 600 .7rem var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--physical-dark); }
.partner strong { font: 600 1.05rem var(--font-display); color: var(--ink); }
.partner .sub { font-size: .88rem; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.partner .ext { width: 13px; height: 13px; }
a.partner:hover strong { color: var(--brand); }
a.partner:hover { background: #fafbfe; color: inherit; }

.hero-meta a { color: #fff; text-decoration-color: rgba(255, 255, 255, .4); }
.hero-meta a:hover { color: #fff; text-decoration-color: #fff; }
.footer-partner { margin-top: 10px !important; }

/* ---------- Paper format block ---------- */
.format-grid {
  display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff;
  margin-bottom: 1.4em;
}
@media (min-width: 820px) { .format-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); } }
.format-facts { display: grid; background: var(--bg-soft); }
.format-facts > div { display: grid; gap: 2px; padding: 14px 20px; border-bottom: 1px solid var(--line); }
.format-facts > div:last-child { border-bottom: 0; }
.format-facts .k { font: 600 .7rem var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.format-facts .v { font-weight: 600; color: var(--ink); }
.format-actions { padding: 20px 22px; display: grid; gap: 14px; align-content: start; min-width: 0; }

/* Fee table group rows */
th.group-row { background: #fafbfe; font-family: var(--font-display); color: var(--ink); text-transform: none; letter-spacing: 0; font-size: .95rem; }