/* ==========================================================================
   DQC 2026 — stylesheet
   Palette follows the Quantum Software Consortium (qscc.ca): deep green
   #003300 as the anchor, with a brighter circuit-green as the accent.
   ========================================================================== */

:root {
  --brand-950: #001a05;
  --brand-900: #003300;   /* QSC signature green */
  --brand-800: #06421a;
  --brand-700: #0b6029;
  --brand-600: #12833a;
  --accent:    #2fbf6b;
  --accent-lt: #4fe08c;

  --ink:       #101a13;
  --ink-2:     #35473c;
  --muted:     #6a7d71;
  --paper:     #ffffff;
  --surface:   #f3f7f4;
  --surface-2: #e9f1eb;
  --line:      rgba(0, 51, 0, .13);
  --line-soft: rgba(0, 51, 0, .07);

  --shadow: 0 1px 2px rgba(0, 40, 10, .04), 0 10px 30px -18px rgba(0, 40, 10, .35);
  --radius: 14px;
  --wrap: 1080px;

  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --display: "Space Grotesk", var(--sans);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:       #e4efe8;
    --ink-2:     #b8ccc0;
    --muted:     #8ba396;
    --paper:     #0c120e;
    --surface:   #111a14;
    --surface-2: #16211a;
    --line:      rgba(120, 220, 160, .16);
    --line-soft: rgba(120, 220, 160, .09);
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -18px rgba(0, 0, 0, .8);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { font-family: var(--display); line-height: 1.16; margin: 0; letter-spacing: -.015em; }
p { margin: 0 0 1rem; }
a { color: var(--brand-700); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--brand-600); }
@media (prefers-color-scheme: dark) { a { color: var(--accent-lt); } a:hover { color: #7df0ac; } }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: min(var(--wrap), calc(100% - 2.5rem)); margin-inline: auto; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--brand-900); color: #fff; padding: .6rem 1rem; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ------------------------------- nav ------------------------------------ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--brand-950);
  background: color-mix(in srgb, var(--brand-950) 92%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 60px; }

.brand { display: inline-flex; align-items: center; gap: .55rem; color: #fff; text-decoration: none; }
.brand-mark { color: var(--accent-lt); display: inline-flex; }
.brand-text { font-family: var(--display); font-weight: 700; letter-spacing: .06em; font-size: .98rem; }

.nav-links { display: flex; align-items: center; gap: .35rem; }
.nav-links a {
  color: rgba(255, 255, 255, .8); text-decoration: none; font-size: .9rem; font-weight: 500;
  padding: .4rem .6rem; border-radius: 8px;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, .08); }
.nav-links .btn { margin-left: .35rem; }

@media (max-width: 720px) {
  .nav-links a:not(.btn):not([href="#program"]) { display: none; }
}

/* ------------------------------ buttons --------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  font-family: var(--sans); font-weight: 600; font-size: .95rem; line-height: 1;
  padding: .78rem 1.15rem; border-radius: 10px; text-decoration: none;
  border: 1px solid transparent; transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-sm { padding: .5rem .8rem; font-size: .86rem; }
.btn-accent { background: var(--accent); color: #04240f !important; }
.btn-accent:hover { background: var(--accent-lt); color: #04240f !important; }
.btn-ghost { border-color: rgba(255, 255, 255, .28); color: #fff !important; }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }
.section .btn-ghost { border-color: var(--line); color: var(--ink) !important; }
.section .btn-ghost:hover { border-color: var(--brand-600); background: var(--surface); }

/* ------------------------------- hero ----------------------------------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(900px 420px at 78% -10%, rgba(47, 191, 107, .30), transparent 62%),
    radial-gradient(700px 380px at 8% 108%, rgba(47, 191, 107, .16), transparent 60%),
    linear-gradient(168deg, #012b0c 0%, var(--brand-900) 42%, #01230a 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background-image:
    linear-gradient(rgba(120, 255, 180, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 255, 180, .06) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 78%);
}
.hero-inner { position: relative; padding: 4.6rem 0 4rem; max-width: 830px; }

.eyebrow {
  font-family: var(--mono); font-size: .76rem; letter-spacing: .13em; text-transform: uppercase;
  color: var(--accent-lt); margin: 0 0 1.1rem;
}
.hero h1 { font-size: clamp(2.15rem, 5.4vw, 3.5rem); font-weight: 700; }
.hero h1 em {
  display: block; font-style: normal; font-weight: 500;
  font-size: clamp(1.1rem, 2.4vw, 1.6rem); color: rgba(255, 255, 255, .82); letter-spacing: 0;
}
.hero-rule { display: block; width: 62px; height: 3px; background: var(--accent); border-radius: 3px; margin: 1.1rem 0 .95rem; }

.lede { font-size: clamp(1rem, 1.6vw, 1.12rem); color: rgba(255, 255, 255, .8); max-width: 62ch; margin-top: 1.2rem; }

.facts {
  list-style: none; margin: 2rem 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(155px, 1fr)); gap: 1px;
  background: rgba(255, 255, 255, .13); border: 1px solid rgba(255, 255, 255, .13); border-radius: 12px; overflow: hidden;
}
.facts li { background: rgba(1, 30, 10, .55); padding: .85rem 1rem; display: flex; flex-direction: column; gap: .18rem; }
.fact-k { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-lt); font-family: var(--mono); }
.fact-v { font-size: .92rem; font-weight: 500; color: #fff; }

.cta { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.9rem; }

/* ------------------------------ sections -------------------------------- */
.section { padding: 4.6rem 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--line-soft); }

.kicker {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--brand-600); margin: 0 0 .7rem;
}
@media (prefers-color-scheme: dark) { .kicker { color: var(--accent); } }

.section h2 { font-size: clamp(1.5rem, 3vw, 2.05rem); font-weight: 600; max-width: 24ch; }
.section-lede { color: var(--ink-2); max-width: 68ch; margin-top: .9rem; }
.note {
  display: inline-block; font-size: .86rem; color: var(--ink-2);
  background: var(--surface-2); border: 1px solid var(--line);
  border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; padding: .5rem .8rem; margin: .3rem 0 1.8rem;
}
.section-alt .note { background: var(--paper); }
.fineprint { font-size: .87rem; color: var(--muted); margin-top: 1.6rem; }

/* -------------------------------- cards --------------------------------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); gap: 1rem; margin-top: 2.2rem; }
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem 1.3rem; box-shadow: var(--shadow); position: relative;
}
.card-num { font-family: var(--mono); font-size: .74rem; color: var(--accent); letter-spacing: .1em; }
.card h3 { font-size: 1.06rem; font-weight: 600; margin: .5rem 0 .5rem; }
.card p { font-size: .93rem; color: var(--ink-2); margin: 0; }

.topics { margin-top: 2.8rem; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: .45rem; padding: 0; margin: 0; }
.chips li {
  font-size: .84rem; color: var(--ink-2); background: var(--surface);
  border: 1px solid var(--line); border-radius: 999px; padding: .32rem .78rem;
}
.section-alt .chips li { background: var(--paper); }

.audience { margin-top: 2.8rem; border-top: 1px solid var(--line); padding-top: 1.6rem; }
.audience h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: .5rem; }
.audience p { color: var(--ink-2); max-width: 72ch; font-size: .95rem; margin: 0; }

/* ------------------------------ schedule -------------------------------- */
.schedule { display: grid; gap: 1.1rem; margin-top: 2rem; }

.session {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.session-head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: .5rem 1rem;
  padding: 1.15rem 1.3rem; border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 9%, transparent), transparent 55%);
}
.session-label {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--brand-700); background: var(--surface-2);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  padding: .22rem .55rem; border-radius: 6px;
}
@media (prefers-color-scheme: dark) { .session-label { color: var(--accent-lt); } }
.session-time { font-family: var(--mono); font-size: .88rem; font-weight: 600; color: var(--ink); margin-left: auto; }
.session-title { flex-basis: 100%; font-size: 1.16rem; font-weight: 600; font-family: var(--display); }
.session-summary { flex-basis: 100%; font-size: .9rem; color: var(--ink-2); margin: 0; max-width: 74ch; }

.talks { list-style: none; margin: 0; padding: 0; }
.talk {
  display: grid; grid-template-columns: 88px 1fr auto; gap: 1rem; align-items: start;
  padding: .95rem 1.3rem; border-top: 1px solid var(--line-soft);
}
.talk:first-child { border-top: none; }
.talk:hover { background: var(--surface); }
.talk-when {
  font-family: var(--mono); font-size: .82rem; color: var(--muted); padding-top: .15rem; white-space: nowrap;
}
.talk-name { font-weight: 600; font-size: 1rem; }
.talk-aff { font-weight: 400; color: var(--muted); }
.talk-aff::before { content: " · "; }
.talk-topic { font-size: .91rem; color: var(--ink-2); margin: .12rem 0 0; }
.talk-note {
  display: inline-block; margin-top: .35rem; font-size: .74rem; color: var(--ink-2);
  border: 1px dashed var(--line); border-radius: 6px; padding: .1rem .45rem;
}
.talk-tag {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .07em; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: .2rem .55rem; white-space: nowrap;
}
.talk-tag.is-paper { color: var(--brand-700); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
@media (prefers-color-scheme: dark) { .talk-tag.is-paper { color: var(--accent-lt); } }

.talk.is-tba .talk-name { color: var(--muted); font-weight: 500; font-style: italic; }

.gap {
  display: flex; align-items: center; gap: .8rem; padding: .15rem .4rem;
  font-size: .84rem; color: var(--muted); font-family: var(--mono);
}
.gap::after { content: ""; flex: 1; height: 1px; background: var(--line); }

@media (max-width: 620px) {
  .talk { grid-template-columns: 1fr auto; gap: .5rem .8rem; }
  .talk-when { grid-column: 1 / -1; order: -1; }
}

/* ------------------------------ speakers -------------------------------- */
.speakers {
  list-style: none; padding: 0; margin: 2rem 0 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .9rem;
}
.speaker {
  display: flex; gap: .8rem; align-items: center;
  border: 1px solid var(--line); border-radius: var(--radius); padding: .9rem 1rem; background: var(--paper);
}
.avatar {
  flex: none; width: 42px; height: 42px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--display); font-weight: 700; font-size: .86rem;
  color: #eafff2; background: linear-gradient(140deg, var(--brand-700), var(--accent));
}
.speaker-name { font-weight: 600; font-size: .95rem; line-height: 1.3; }
.speaker-aff { font-size: .84rem; color: var(--muted); }
.speaker.is-more { border-style: dashed; color: var(--muted); font-size: .9rem; justify-content: center; text-align: center; }

/* ----------------------------- organizers ------------------------------- */
.organizers {
  list-style: none; padding: 0; margin: 2rem 0 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: .9rem;
}
.organizer { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.05rem 1.1rem; background: var(--paper); }
.organizer .o-name { font-weight: 600; font-size: .98rem; }
.organizer .o-aff { font-size: .85rem; color: var(--brand-600); font-weight: 500; margin-bottom: .35rem; }
@media (prefers-color-scheme: dark) { .organizer .o-aff { color: var(--accent); } }
.organizer .o-focus { font-size: .87rem; color: var(--ink-2); margin: 0; }

/* -------------------------------- attend -------------------------------- */
.attend { display: grid; grid-template-columns: 1.6fr 1fr; gap: 2.5rem; align-items: start; }
.attend-side {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  padding: 1.3rem; box-shadow: var(--shadow);
}
.attend-side dl { margin: 0; display: grid; gap: .1rem; }
.attend-side dt {
  font-family: var(--mono); font-size: .69rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted);
  margin-top: .9rem;
}
.attend-side dt:first-child { margin-top: 0; }
.attend-side dd { margin: 0; font-size: .94rem; font-weight: 500; }
.mono { font-family: var(--mono); font-size: .86rem !important; }

@media (max-width: 760px) { .attend { grid-template-columns: 1fr; gap: 1.8rem; } }

/* -------------------------------- footer -------------------------------- */
.foot { background: var(--brand-950); color: rgba(255, 255, 255, .72); padding: 2.4rem 0; }
.foot-inner { display: flex; flex-wrap: wrap; gap: 1.2rem; justify-content: space-between; align-items: center; }
.foot-title { font-family: var(--display); font-weight: 600; color: #fff; margin: 0; }
.foot-sub { font-size: .87rem; margin: .2rem 0 0; }
.foot-links { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.foot-links a { color: var(--accent-lt); font-size: .88rem; text-decoration: none; }
.foot-links a:hover { text-decoration: underline; }