/* IMPACT Lab website styles — dark theme */
:root {
  color-scheme: dark;
  --bg: #0b1118;        /* page background */
  --bg-soft: #111a24;   /* alternate section background */
  --panel: #15202c;     /* cards, boxes */
  --ink: #e8eef5;       /* main text */
  --muted: #a8b6c4;     /* secondary text */
  --subtle: #74848f;    /* faint text */
  --line: #243343;      /* borders */
  --accent: #4fc3d9;    /* links, highlights (cyan) */
  --accent-2: #f2c96d;  /* gold highlight */
  --head: #ffffff;      /* headings */
  --max: 1100px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

h1, h2, h3, h4, .nav, .eyebrow, .btn, .meta, .tag {
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }

img { max-width: 100%; display: block; }

.wrap { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }

/* Header */
header.site {
  border-bottom: 1px solid var(--line);
  background: #0d141d;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  flex-wrap: wrap;
}
.brand { text-decoration: none; color: var(--ink); }
.brand .lab { font: 700 1.5rem/1.1 "Segoe UI", Helvetica, Arial, sans-serif; color: var(--accent-2); letter-spacing: 0.5px; }
.brand .full { font-size: 0.85rem; color: var(--subtle); margin-top: 2px; font-family: "Segoe UI", Helvetica, Arial, sans-serif; }
.nav { display: flex; flex-wrap: wrap; gap: 2px; }
.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.93rem;
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 3px solid transparent;
}
.nav a:hover { color: var(--head); }
.nav a.active { color: var(--head); border-bottom-color: var(--accent); }

/* Hero */
.hero {
  background:
    radial-gradient(circle at 15% 0%, rgba(79, 195, 217, 0.14), transparent 30rem),
    radial-gradient(circle at 90% 20%, rgba(242, 201, 109, 0.10), transparent 26rem),
    linear-gradient(160deg, #0d1722 0%, #0f1d2c 70%, #112433 100%);
  color: #fff;
  padding: 64px 0;
  border-bottom: 1px solid var(--line);
}
.hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); margin: 0 0 14px; line-height: 1.15; color: var(--head); }
.hero p { max-width: 760px; font-size: 1.12rem; color: var(--muted); margin: 0 0 24px; }
.hero .tagline { color: var(--accent-2); font-weight: 600; font-family: "Segoe UI", Helvetica, Arial, sans-serif; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.85rem; margin-bottom: 10px; }

.btn {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--accent);
  color: var(--accent);
  margin-right: 10px;
}
.btn.solid { background: var(--accent); color: #06121a; }
.btn.dark { border-color: var(--accent); color: var(--accent); }
.btn:hover { opacity: 0.85; }

/* Sections */
section.block { padding: 56px 0; }
section.block.alt { background: var(--bg-soft); border-block: 1px solid var(--line); }
.eyebrow {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  margin: 0 0 6px;
}
h2.title { font-size: 1.8rem; color: var(--accent); margin: 0 0 24px; }
h3 { color: var(--head); }

.grid { display: grid; gap: 22px; }
.grid.c2 { grid-template-columns: repeat(2, 1fr); }
.grid.c3 { grid-template-columns: repeat(3, 1fr); }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 22px;
}
.card h3 { margin: 0 0 10px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; }
.card ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 0.93rem; }
.card li { margin: 5px 0; }

/* People */
.person { text-align: center; }
.person img {
  width: min(100%, 170px);
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center 25%;
  border: 1px solid var(--line);
  margin: 0 auto 12px;
}
.split > .person img {
  width: min(100%, 190px);
}
.person h3 { margin: 0 0 4px; font-size: 1.02rem; }
.person .role { color: var(--muted); font-size: 0.9rem; font-family: "Segoe UI", Helvetica, Arial, sans-serif; }
.person.no-photo {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 14px;
}

/* Research figures */
.figure {
  border: 1px solid var(--line);
  background: #000;
  margin: 0 0 22px;
}
.figure img { width: 100%; object-fit: cover; }
.figure figcaption {
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  color: var(--subtle);
  padding: 8px 12px;
  background: var(--panel);
  border-top: 1px solid var(--line);
}
.theme-figs { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 22px; }
@media (max-width: 860px) { .theme-figs { grid-template-columns: 1fr; } }

.spie-links {
  margin: 14px 0 0;
  padding: 12px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  font-size: 0.9rem;
}
.spie-links strong { font-family: "Segoe UI", Helvetica, Arial, sans-serif; color: var(--accent-2); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }
.spie-links ul { margin: 8px 0 0; padding-left: 18px; }
.spie-links li { margin: 5px 0; color: var(--muted); }

/* Slideshow */
.slideshow {
  position: relative;
  border: 1px solid var(--line);
  background: #000;
  overflow: hidden;
}
.slideshow .slide {
  display: none;
  width: 100%;
  height: 480px;
}
.slideshow .slide.active { display: block; }
.slideshow .slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.slideshow .slide figcaption {
  display: none;
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 10px 16px;
  background: rgba(7, 13, 19, 0.78);
  color: var(--muted);
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.88rem;
}
.slideshow .ss-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(7, 13, 19, 0.6);
  color: #fff;
  border: 1px solid var(--line);
  font-size: 1.3rem;
  line-height: 1;
  padding: 10px 14px;
  cursor: pointer;
}
.slideshow .ss-btn:hover { background: rgba(79, 195, 217, 0.35); }
.slideshow .ss-prev { left: 12px; }
.slideshow .ss-next { right: 12px; }
.slideshow .ss-dots {
  position: absolute;
  top: 12px; right: 16px;
  display: flex; gap: 8px;
}
.slideshow .ss-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
}
.slideshow .ss-dots span.active { background: var(--accent); }
@media (max-width: 620px) { .slideshow .slide { height: 300px; } }

/* News */
.news-item { border-bottom: 1px solid var(--line); padding: 18px 0; }
.news-item:last-child { border-bottom: none; }
.news-item .meta { color: var(--subtle); font-size: 0.84rem; text-transform: uppercase; letter-spacing: 0.05em; }
.news-item h3 { margin: 4px 0 6px; font-size: 1.08rem; }
.news-item p { margin: 0; color: var(--muted); }
.tag {
  display: inline-block;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 1px 8px;
  margin-left: 8px;
  vertical-align: middle;
}

/* Publications */
.pub-year { color: var(--accent-2); font-size: 1.2rem; margin: 32px 0 8px; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
ul.pubs { list-style: none; padding: 0; margin: 0; }
ul.pubs li { padding: 9px 0 9px 16px; border-left: 3px solid var(--line); margin: 8px 0; font-size: 0.96rem; color: var(--ink); }
ul.pubs li:hover { border-left-color: var(--accent); }
ul.pubs .src { color: var(--subtle); font-style: italic; }

/* Page header band */
.page-head {
  background:
    radial-gradient(circle at 20% 0%, rgba(79, 195, 217, 0.12), transparent 24rem),
    #0f1d2c;
  color: #fff;
  padding: 38px 0;
  border-bottom: 1px solid var(--line);
}
.page-head h1 { margin: 0; font-size: 2rem; color: var(--accent); }
.page-head p { margin: 8px 0 0; color: var(--muted); max-width: 760px; }

/* Two-column info */
.split { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: start; }
.info-box { background: var(--panel); border: 1px solid var(--line); padding: 22px; }
.info-box h3 { margin-top: 0; }
.info-box p { font-size: 0.95rem; color: var(--muted); }

dl.contact dt { font-weight: 700; font-family: "Segoe UI", Helvetica, Arial, sans-serif; color: var(--accent); margin-top: 14px; font-size: 0.9rem; }
dl.contact dd { margin: 2px 0 0; color: var(--muted); }

/* Footer */
footer.site {
  background: #0d141d;
  color: var(--subtle);
  padding: 32px 0;
  margin-top: 56px;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}
footer.site a { color: var(--accent); }
footer.site .cols { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .grid.c3, .grid.c4 { grid-template-columns: repeat(2, 1fr); }
  .grid.c2 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr !important; }
  .hero .wrap { grid-template-columns: 1fr !important; }
}
@media (max-width: 540px) {
  .grid.c3, .grid.c4 { grid-template-columns: 1fr; }
  .masthead { flex-direction: column; align-items: flex-start; }
}

.link-button {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font: 600 0.95rem "Segoe UI", Helvetica, Arial, sans-serif;
  cursor: pointer;
}
.link-button:hover { opacity: 0.85; }
.research-topic .title { margin-bottom: 18px; }
.topic-panels {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 20px;
}
.figure-panel { display: flex; align-items: center; justify-content: center; }
.text-panel h3:first-child { margin-top: 0; }
.compact-figure { width: 100%; margin: 0; background: transparent; border: 0; }
.compact-figure img { width: 100%; max-height: 330px; object-fit: contain; background: transparent; }
.figure-stack { display: grid; gap: 16px; }
.research-slideshow { width: 100%; border: 0; background: transparent; }
.research-slideshow .slide { height: 330px; }
.research-slideshow .slide img { object-fit: contain; background: transparent; }
.mini-slide { display: none; }
.mini-slide.active { display: block; }
.mini-controls {
  display: flex;
  gap: 8px;
  margin: 10px 0 4px;
}
.mini-controls button {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--accent);
  font: 600 0.78rem "Segoe UI", Helvetica, Arial, sans-serif;
  padding: 5px 9px;
  cursor: pointer;
}
.mini-controls button:hover { border-color: var(--accent); }
@media (max-width: 860px) { .topic-panels { grid-template-columns: 1fr; } }
.topic-slide { display: none; }
.topic-slide.active { display: block; }
.panel-img {
  width: 100%;
  max-height: 430px;
  object-fit: contain;
  background: transparent;
}
.carousel-controls {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.carousel-controls button {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--accent);
  font: 600 0.82rem "Segoe UI", Helvetica, Arial, sans-serif;
  padding: 6px 10px;
  cursor: pointer;
}
.carousel-controls button:hover { border-color: var(--accent); }
/* Feedback pass: connected research topic panels */
.research-topic h2.title { color: var(--head); }
.topic-kicker {
  margin: 0;
  padding: 18px 20px 0;
  color: var(--head);
  background: var(--panel);
  border: 1px solid var(--line);
  border-bottom: 0;
  font-size: 1.08rem;
}
.topic-panels {
  gap: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
}
.topic-kicker + .topic-panels { border-top: 0; }
.panel {
  border: 0;
  border-top: 0;
  background: transparent;
}
.figure-panel { border-right: 1px solid var(--line); }
.image-slide { display: none; width: 100%; }
.image-slide.active { display: block; }
.image-carousel { width: 100%; }
.image-controls { justify-content: center; }
.panel-img { max-height: 500px; }
.info-box ul { margin-top: 0; margin-bottom: 0; }
@media (max-width: 860px) { .figure-panel { border-right: 0; border-bottom: 1px solid var(--line); } }

/* Deep Reconstruction Workshop archive */
.workshop-head { padding: 50px 0; }
.workshop-head .eyebrow { margin-bottom: 8px; }
.workshop-head h1 { color: var(--head); font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.12; }
.workshop-overview { padding-bottom: 44px; }
.workshop-overview p, .workshop-introduction p { max-width: 900px; color: var(--muted); }
.workshop-overview .title, .workshop-introduction .title { color: var(--head); margin-bottom: 16px; }
.workshop-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 36px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.workshop-metrics div { padding: 20px; text-align: center; border-right: 1px solid var(--line); }
.workshop-metrics div:last-child { border-right: 0; }
.workshop-metrics strong {
  display: block;
  color: var(--accent-2);
  font: 700 1.8rem/1 "Segoe UI", Helvetica, Arial, sans-serif;
}
.workshop-metrics span {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font: 600 0.78rem/1.2 "Segoe UI", Helvetica, Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.agenda-list { border-top: 1px solid var(--line); }
.agenda-item {
  display: grid;
  grid-template-columns: 92px 76px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.agenda-item time {
  align-self: start;
  padding-top: 4px;
  color: var(--accent-2);
  font: 700 0.86rem/1.3 "Segoe UI", Helvetica, Arial, sans-serif;
  white-space: nowrap;
}
.agenda-item img {
  width: 76px;
  height: 76px;
  object-fit: cover;
  object-position: center 25%;
  border: 1px solid var(--line);
  background: var(--panel);
}
.agenda-copy h3 { margin: 0 0 4px; font-size: 1.03rem; line-height: 1.35; }
.agenda-copy p { margin: 0 0 7px; color: var(--muted); font-size: 0.92rem; }
.agenda-copy strong { color: var(--ink); }
.speaker-link { color: inherit; text-decoration-color: rgba(79, 195, 217, 0.5); text-underline-offset: 2px; }
.speaker-link:hover { color: var(--accent); text-decoration-color: var(--accent); }
.agenda-brief, .agenda-break, .agenda-special { grid-template-columns: 92px minmax(0, 1fr); }
.agenda-break { padding-block: 13px; }
.agenda-break h3 { color: var(--muted); }
.agenda-special { background: linear-gradient(90deg, rgba(79, 195, 217, 0.08), transparent); padding-inline: 14px; }
.recording-status {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 3px 8px;
  color: var(--muted);
  font: 600 0.75rem/1.25 "Segoe UI", Helvetica, Arial, sans-serif;
  text-decoration: none;
}
.recording-status.private { border-color: rgba(79, 195, 217, 0.45); color: var(--accent); }
.recording-status.pending { border-color: rgba(242, 201, 109, 0.45); color: var(--accent-2); }
.recording-status.not-planned { color: var(--subtle); }
.recording-status.private:hover { border-color: var(--accent); }
.previous-meetings ul { max-width: 900px; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.previous-meetings li { display: grid; grid-template-columns: minmax(0, 1fr) minmax(240px, 0.8fr); gap: 24px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.previous-meetings li span { color: var(--muted); }

@media (max-width: 700px) {
  .agenda-item { grid-template-columns: 68px 64px minmax(0, 1fr); gap: 12px; }
  .agenda-item img { width: 64px; height: 64px; }
  .agenda-brief, .agenda-break, .agenda-special { grid-template-columns: 68px minmax(0, 1fr); }
  .previous-meetings li { grid-template-columns: 1fr; gap: 4px; }
}

@media (max-width: 470px) {
  .agenda-item { grid-template-columns: 62px minmax(0, 1fr); align-items: start; }
  .agenda-item img { grid-column: 2; }
  .agenda-item .agenda-copy { grid-column: 2; }
  .agenda-item:not(.agenda-brief):not(.agenda-break):not(.agenda-special) .agenda-copy { margin-top: -8px; }
  .agenda-brief, .agenda-break, .agenda-special { grid-template-columns: 62px minmax(0, 1fr); }
  .agenda-special .agenda-copy { grid-column: 2; }
}