/* ================================================================
   style.css  —  NSW COMPUTATIONAL IMAGING WORKSHOP
   ================================================================
   SECTIONS (Ctrl+F to jump):
     TOKENS          CSS custom properties (colours, etc.)
     RESET           box-model and base body
     TYPOGRAPHY      links, selection, serif utility class
     LAYOUT          .wrap container
     TOP BAR         .topbar, .mark, nav
     HERO            .hero, .hero-grid, .eyebrow, h1.title,
                     .lede, .hero-meta, .aperture
     SECTIONS        shared section, .section-head, .section-title
     PROSE           .prose paragraphs
     PROGRAMME       .programme, .programme-item
     TOPICS          .topics list
     PEOPLE          .people, .person cards
     TIMELINE        .timeline list
     CTA             .cta-grid, .cta cards (Get Involved)
     FOOTER          footer, .foot-grid, .colophon
     MISC            .disclosure, entrance animation
================================================================ */


/* ──────────────────────────────────────────────────────────────
   TOKENS
────────────────────────────────────────────────────────────── */

:root {
  --bg:          #0e1014;
  --bg-soft:     #14171c;
  --bg-elev:     #1a1e25;
  --rule:        #262b34;
  --rule-soft:   #1c2028;
  --text:        #e6e8ec;
  --text-soft:   #aab0bb;
  --muted:       #6d7585;
  --accent:      #7ec4e3;      /* soft optical cyan */
  --accent-deep: #4f9cc2;
  --highlight:   #f0c674;
}


/* ──────────────────────────────────────────────────────────────
   RESET
────────────────────────────────────────────────────────────── */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-image:
    radial-gradient(ellipse at top left,    rgba(126,196,227,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(126,196,227,0.03) 0%, transparent 50%);
  background-attachment: fixed;
}


/* ──────────────────────────────────────────────────────────────
   TYPOGRAPHY
────────────────────────────────────────────────────────────── */

::selection { background: var(--accent); color: var(--bg); }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(126,196,227,0.3);
  transition: color .15s, border-color .15s;
}
a:hover { color: #a8d8ee; border-bottom-color: #a8d8ee; }

.serif {
  font-family: "Source Serif 4", "Source Serif Pro", Georgia, serif;
}


/* ──────────────────────────────────────────────────────────────
   LAYOUT
────────────────────────────────────────────────────────────── */

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 640px) {
  .wrap  { padding: 0 20px; }
  body   { font-size: 15.5px; }
}


/* ──────────────────────────────────────────────────────────────
   TOP BAR
────────────────────────────────────────────────────────────── */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0 0 0;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-soft);
}

.topbar .mark   { color: var(--text); font-weight: 600; }
.topbar nav a   { margin-left: 28px; border: none; color: var(--text-soft); font-weight: 400; }
.topbar nav a:hover { color: var(--accent); }

@media (max-width: 720px) {
  .topbar nav { display: none; }
}


/* ──────────────────────────────────────────────────────────────
   HERO
────────────────────────────────────────────────────────────── */

.hero {
  position: relative;
  z-index: 0;
  padding: 80px 0 100px 0;
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
  background-size: cover;
  background-position: center;
}

/* Dark scrim over the banner image so text stays legible.
   Only applied when layout.js adds .has-banner (i.e. hero.banner is set
   in content.js). Tweak the rgba stops to taste — alpha 0 = transparent.
   z-index: -1 keeps it strictly below the hero's content (which sits in
   the same stacking context at z-index: 0 / auto by default). */
.hero.has-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    180deg,
    rgba(14, 16, 20, 0.55) 0%,
    rgba(14, 16, 20, 0.62) 45%,
    rgba(14, 16, 20, 0.88) 100%
  );
  pointer-events: none;
}

.hero > * {
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 60px;
  align-items: end;
}

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
}

.eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 1px;
  background: var(--accent);
}

h1.title {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: clamp(42px, 6.5vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  margin: 0 0 32px 0;
  color: var(--text);
}
h1.title em { font-style: italic; color: var(--accent); font-weight: 400; }

.lede {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(18px, 1.4vw, 21px);
  line-height: 1.5;
  font-weight: 400;
  color: var(--text-soft);
  max-width: 40ch;
}

.hero-meta {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 26px 28px;
  border-radius: 2px;
}
.hero-meta dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 24px;
  font-size: 14px;
}
.hero-meta dt {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 10.5px;
  font-weight: 600;
  padding-top: 3px;
}
.hero-meta dd { margin: 0; color: var(--text); }
.hero-meta .card-section-head {
  margin: 14px 0 2px 0;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.hero-meta .free-badge {
  display: inline-block;
  margin-top: 22px;
  padding: 7px 14px;
  background: var(--accent);
  color: var(--bg);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 2px;
}

/* coded-aperture motif */
.aperture {
  position: absolute;
  right: -70px;
  top: 50px;
  width: 300px;
  height: 300px;
  opacity: 0.05;
  pointer-events: none;
  transform: rotate(-8deg);
}
@media (max-width: 880px) { .aperture { display: none; } }


/* ──────────────────────────────────────────────────────────────
   SECTIONS  (shared)
────────────────────────────────────────────────────────────── */

section {
  padding: 90px 0;
  border-bottom: 1px solid var(--rule);
}
@media (max-width: 640px) { section { padding: 64px 0; } }

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 60px;
  margin-bottom: 48px;
  align-items: start;
}
@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: 12px; margin-bottom: 32px; }
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 16px;
}
.section-label .num { color: var(--accent); margin-right: 10px; }

.section-title {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: clamp(30px, 3.8vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0;
  max-width: 22ch;
  color: var(--text);
}
.section-title em { font-style: italic; color: var(--accent); }

.section-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 60px;
}
@media (max-width: 720px) {
  .section-body { grid-template-columns: 1fr; gap: 24px; }
}


/* ──────────────────────────────────────────────────────────────
   PROSE
────────────────────────────────────────────────────────────── */

.prose p {
  margin: 0 0 20px 0;
  max-width: 65ch;
  color: var(--text-soft);
  font-size: 16px;
}
.prose p.lead {
  font-size: 18px;
  color: var(--text);
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.5;
}





/* ──────────────────────────────────────────────────────────────
   TOPICS
────────────────────────────────────────────────────────────── */

.topics {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}
.topics li {
  padding: 24px 24px 28px 0;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.topics li + li { border-left: 1px solid var(--rule); padding-left: 24px; }
@media (max-width: 720px) {
  .topics li + li { border-left: none; padding-left: 0; }
}
.topics .topic-num {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}
.topics .topic-name {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: 20px;
  line-height: 1.25;
  color: var(--text);
}

/* ──────────────────────────────────────────────────────────────
   TIMELINE
────────────────────────────────────────────────────────────── */

.timeline { padding-left: 0; margin: 0; list-style: none; }
.timeline li {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 16px 0;
  border-bottom: 1px dotted var(--rule);
}
@media (max-width: 640px) {
  .timeline li { grid-template-columns: 1fr; gap: 4px; }
}
.timeline .when {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 4px;
}
.timeline .what { font-size: 16px; color: var(--text); }
.timeline li.now {
  background: linear-gradient(90deg, rgba(126,196,227,0.08), transparent 70%);
  margin-left: -16px;
  padding-left: 16px;
}

/* ──────────────────────────────────────────────────────────────
   PROGRAMME
────────────────────────────────────────────────────────────── */

.programme { border-top: 1px solid var(--rule); }

.programme-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}
@media (max-width: 640px) {
  .programme-item { grid-template-columns: 1fr; gap: 8px; padding: 22px 0; }
}

.programme-item .pi-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 6px;
}
.programme-item h3 {
  margin: 0 0 8px 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: 21px;
  line-height: 1.25;
  color: var(--text);
}
.programme-item h3 em { font-style: italic; color: var(--accent); }
.programme-item p { margin: 0; color: var(--text-soft); max-width: 60ch; font-size: 15.5px; }

/* ──────────────────────────────────────────────────────────────
   PEOPLE
────────────────────────────────────────────────────────────── */

.people {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}
.person {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 22px 22px 24px 22px;
  border-radius: 2px;
}
.person-photo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin-bottom: 14px;
  border: 1px solid var(--rule);
  filter: grayscale(15%);
}
.person .name {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 500;
  font-size: 19px;
  line-height: 1.25;
  margin-bottom: 4px;
  color: var(--text);
}
.person .role {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.person .bio    { font-size: 14.5px; color: var(--text-soft); line-height: 1.5; }
.person .ieee {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-top: 10px;
  border: 1px solid var(--accent-deep);
  padding: 3px 8px;
  text-transform: uppercase;
  border-radius: 2px;
}

/* ──────────────────────────────────────────────────────────────
   SPEAKERS  (single-column, horizontal rows — photo + blurb)
────────────────────────────────────────────────────────────── */

.speakers-list {
  display: flex;
  flex-direction: column;
}
.speaker-row {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--rule);
}
.speaker-row:first-child { padding-top: 0; }
.speaker-row:last-child  { border-bottom: none; }

.speaker-photo {
  flex: 0 0 auto;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--rule);
  filter: grayscale(15%);
}
.speaker-body { flex: 1 1 auto; min-width: 0; }
.speaker-body .name {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 500;
  font-size: 20px;
  line-height: 1.25;
  margin-bottom: 4px;
  color: var(--text);
}
.speaker-body .role {
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.speaker-body .bio {
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.55;
  max-width: 68ch;
}
.speaker-body .ieee {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-top: 10px;
  border: 1px solid var(--accent-deep);
  padding: 3px 8px;
  text-transform: uppercase;
  border-radius: 2px;
}

@media (max-width: 560px) {
  .speaker-row { gap: 16px; }
  .speaker-photo { width: 64px; height: 64px; }
}





/* ──────────────────────────────────────────────────────────────
   CTA  (Get Involved — currently hidden)
────────────────────────────────────────────────────────────── */

.cta-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.cta {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 26px 26px 28px 26px;
  border-radius: 2px;
  transition: border-color .15s, background .15s;
}
.cta:hover { border-color: var(--accent-deep); background: var(--bg-elev); }
.cta h3 {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 500;
  font-size: 21px;
  margin: 0 0 10px 0;
  color: var(--text);
}
.cta p { margin: 0 0 16px 0; color: var(--text-soft); font-size: 15px; }
.cta .cta-action {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: none;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
}


/* ──────────────────────────────────────────────────────────────
   FOOTER
────────────────────────────────────────────────────────────── */

footer {
  padding: 60px 0 70px 0;
  background: var(--bg-soft);
  border-top: 1px solid var(--rule);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-soft);
}
footer a { color: var(--accent); border-bottom-color: rgba(126,196,227,0.3); }
footer a:hover { color: #a8d8ee; border-bottom-color: #a8d8ee; }

.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
}
@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }

.foot-grid h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px 0;
}
.foot-grid p { margin: 0 0 8px 0; max-width: 38ch; }

.colophon {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
}


/* ──────────────────────────────────────────────────────────────
   MISC
────────────────────────────────────────────────────────────── */

.disclosure {
  font-size: 14px;
  color: var(--text-soft);
  margin-top: 16px;
  padding: 16px 18px;
  border: 1px dashed var(--rule);
  background: var(--bg-soft);
  border-radius: 2px;
  max-width: 60ch;
}
.disclosure strong { color: var(--text); font-weight: 600; }

/* entrance animation — respects reduced-motion preference */
@media (prefers-reduced-motion: no-preference) {
  .hero h1.title,
  .hero .lede,
  .hero .hero-meta {
    opacity: 0;
    transform: translateY(8px);
    animation: rise .9s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  }
  .hero .lede       { animation-delay: .12s; }
  .hero .hero-meta  { animation-delay: .22s; }
  @keyframes rise { to { opacity: 1; transform: translateY(0); } }
}