/* A contemporary sculpture gallery: mounted sources, fine frames and quiet tabs. */
:root {
  --gallery-edge: #b9b6be48;
  --gallery-inner: #f1eee51b;
  --gallery-shadow: #00000045;
  --gallery-active: #80eee212;
  --gallery-surface: #141a26;
}
:root[data-theme="day"] {
  --gallery-edge: #aaa68f78;
  --gallery-inner: #aaa68f30;
  --gallery-shadow: #4c483719;
  --gallery-active: #f8e8db80;
  --gallery-surface: #fffdf8;
}

/* Paired hairlines and the shadow of a mounted panel, without bevels. */
:root[data-theme] .home-feature {
  border-color: var(--gallery-edge);
  box-shadow: 0 18px 44px -26px var(--gallery-shadow), 0 2px 6px var(--gallery-shadow);
}
:root[data-theme] .home-feature::after { border-color: var(--gallery-inner); }
.topic-map::before {
  border-color: var(--gallery-edge);
  box-shadow: 0 16px 36px -25px var(--gallery-shadow);
  background: linear-gradient(135deg, var(--gallery-surface), var(--frame-wash));
}
.topic-map::after {
  content: ''; position: absolute; inset: 2px -14px 0; z-index: -1;
  border: 1px solid var(--gallery-inner); pointer-events: none;
}
.frame-corners i { mask-image: url('gallery-corner.svg'); opacity: .7; }
:root[data-theme] .question-card,
:root[data-theme] .focus-mode .question-card {
  border-color: var(--gallery-edge);
  box-shadow: 0 18px 40px -28px var(--gallery-shadow);
}
.question-card>.frame-corners { inset: 6px; border: 1px solid var(--gallery-inner); }
.question-card>.frame-corners i:nth-child(1) { top: -3px; left: -3px; }
.question-card>.frame-corners i:nth-child(2) { top: -3px; right: -3px; }
.question-card>.frame-corners i:nth-child(3) { bottom: -3px; right: -3px; }
.question-card>.frame-corners i:nth-child(4) { bottom: -3px; left: -3px; }
:root[data-theme="day"] .question-card {
  background: linear-gradient(135deg, #fffef9, #f8f5ed 68%, #f0f0e6);
}
:root[data-theme] .topic-row:hover { background: linear-gradient(90deg, var(--gallery-active), transparent); }
.topic-row .arrow { transition: transform 180ms ease; }
.topic-row:hover .arrow { transform: translate(2px, -2px); }

/* The source is a small exhibit beside the heading, not another content panel. */
.context-heading { display: grid; grid-template-columns: minmax(0, 1fr) clamp(140px, 12vw, 190px); gap: 20px; align-items: center; margin: 16px 0; }
.context-heading h2 { margin: 0; }
.source-preview { display: block; min-width: 0; margin: 0; color: var(--muted); text-decoration: none; }
.preview-image {
  display: block; position: relative; overflow: hidden; aspect-ratio: 16 / 10;
  background: #f8f6f0; border: 1px solid var(--gallery-edge);
  box-shadow: 0 5px 12px -8px var(--gallery-shadow);
}
.preview-image::after { content: ''; position: absolute; inset: 4px; border: 1px solid #ffffff35; pointer-events: none; }
.preview-image img { display: block; width: 100%; height: 100%; object-fit: cover; transition: opacity 160ms ease; }
.preview-contain img { object-fit: contain; }
.preview-logo { background: #f0f2eb; }
.preview-logo img { object-fit: contain; padding: 22%; }
.preview-play {
  position: absolute; left: 9px; bottom: 9px; display: grid; place-items: center;
  width: 27px; height: 27px; border: 1px solid #fff9; border-radius: 50%;
  color: #fff; background: #111a25b8; font: 10px/1 var(--sans); padding-left: 2px;
}
.preview-caption { display: flex; justify-content: space-between; gap: 8px; padding-top: 7px; font: 500 9px/1.4 var(--sans); letter-spacing: .25px; }
.preview-caption>span { color: var(--accent); font-size: 12px; line-height: 1; }
a.source-preview:hover { color: var(--ink); }
a.source-preview:hover .preview-image { border-color: var(--accent); }
a.source-preview:hover .preview-caption { text-decoration: underline; text-underline-offset: 3px; }
.preview-concept .preview-image { background: #f5f2e9; }

/* Both levels of discussion tabs share a clear, restrained active underline. */
:root[data-theme] .case-tabs { gap: 8px; }
:root[data-theme] .case-tabs button,
:root[data-theme] .prompt-tabs button {
  border: 0; border-bottom: 2px solid transparent; border-radius: 0;
  background: transparent; color: var(--muted); box-shadow: none;
  padding: 11px 10px; transition: color 160ms ease, background-color 160ms ease;
}
:root[data-theme] .case-tabs button.active,
:root[data-theme] .prompt-tabs button.active,
:root[data-theme] .prompt-tabs button.active:hover {
  color: var(--accent); border-color: var(--accent); font-weight: 600;
  background: linear-gradient(0deg, var(--gallery-active), transparent);
}
:root[data-theme] .case-tabs button:hover,
:root[data-theme] .prompt-tabs button:hover { color: var(--ink); background-color: var(--gallery-active); }
.prompt-tabs { gap: 10px; padding-top: 28px; }
.case-tabs button:focus-visible,.prompt-tabs button:focus-visible,.source-preview:focus-visible { outline-offset: 4px; }

/* One brief pass of reflected light across the water, then the scene rests. */
.hero-visual::after {
  content: ''; position: absolute; z-index: 1; left: -35%; right: -35%; bottom: 0; height: 31%;
  background: linear-gradient(105deg, transparent 30%, #fff9df30 46%, #ffffff65 50%, #fff9df18 55%, transparent 70%);
  mix-blend-mode: soft-light; opacity: 0; pointer-events: none;
  animation: gallery-reflection 4.5s ease-out 1 both;
}
.hero-caption { z-index: 2; }
.topic-map { animation: gallery-arrive 650ms ease-out 1 both; }
@keyframes gallery-reflection {
  0% { transform: translateX(-35%); opacity: 0; }
  25% { opacity: .7; }
  70% { opacity: .4; }
  100% { transform: translateX(35%); opacity: 0; }
}
@keyframes gallery-arrive { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

@media (min-width:1001px) {
  body:not(.focus-mode) .discussion .question-card { align-self: start; position: sticky; top: 24px; min-height: clamp(440px, 55vh, 650px); }
}
@media (min-width:1700px) {
  .context-heading { gap: 26px; }
  .preview-caption { font-size: 12px; }
  .preview-play { width: 34px; height: 34px; font-size: 12px; }
  .prompt-tabs { padding-top: 36px; }
}
@media (max-height:780px) and (min-width:1001px) {
  .context-heading { margin: 14px 0; gap: 15px; grid-template-columns: minmax(0, 1fr) 145px; }
  .context-heading h2 { margin: 0; font-size: 29px; }
  .preview-image { aspect-ratio: 16 / 9; }
  body:not(.focus-mode) .discussion .question-card { min-height: 390px; }
}
@media (max-width:1000px) {
  .topic-map::after { inset: -4px -8px; }
  .context-heading { grid-template-columns: minmax(0, 1fr) minmax(150px, 27%); }
}
@media (max-width:600px) {
  .context-heading { gap: 16px; grid-template-columns: minmax(0, 1fr) 120px; }
  .context-heading h2 { font-size: 28px; }
  .preview-caption { font-size: 9px; }
  .preview-play { width: 23px; height: 23px; left: 6px; bottom: 6px; }
  :root[data-theme] .prompt-tabs { gap: 5px; }
  :root[data-theme] .prompt-tabs button { padding: 11px 6px; }
}
@media (prefers-reduced-motion:reduce) {
  .hero-visual::after { animation: none; display: none; }
  .topic-map { animation: none; }
  .topic-row .arrow,.preview-image img { transition: none; }
}
@media print {
  .hero-visual::after,.topic-map::after { display: none; }
  .topic-map { animation: none; }
  body:not(.focus-mode) .discussion .question-card { position: static; }
  .source-preview { break-inside: avoid; }
}

/* A readable outline of the summit report, kept beside the discussion. */
.summit-takeaways { margin-top: 22px; }
.summit-takeaways ol { margin: 10px 0 0; padding: 0; list-style: none; counter-reset: priority; }
.summit-takeaways li { counter-increment: priority; position: relative; padding: 10px 0 10px 32px; border-top: 1px solid var(--gallery-inner); font-size: 16px; line-height: 1.4; }
.summit-takeaways li::before { content: counter(priority, decimal-leading-zero); position: absolute; left: 0; top: 12px; font: 11px/1.5 var(--sans); color: var(--muted); }
.summit-takeaways strong { display: inline; font-weight: 600; color: var(--ink); }
.summit-takeaways li span { color: var(--muted); }
@media (min-width:1700px) { .summit-takeaways li { font-size: 20px; padding-left: 38px; } .summit-takeaways li::before { font-size: 13px; } }
@media (max-height:780px) and (min-width:1001px) { .summit-takeaways { margin-top: 15px; } .summit-takeaways li { padding-top: 7px; padding-bottom: 7px; font-size: 15px; } .summit-takeaways li::before { top: 9px; } }

/* The talk title, host credit and summary read as one gallery caption. */
.home .talk-title { font-size: clamp(34px, 3.05vw, 56px); line-height: 1.08; letter-spacing: -.8px; max-width: 23ch; margin: 0 0 16px; text-wrap: balance; }
.hero-copy .event-hosts { font-size: clamp(12px, .95vw, 16px); line-height: 1.6; }
.hero-copy .intro { font-size: clamp(17px, 1.15vw, 21px); line-height: 1.55; font-weight: 400; max-width: 58ch; margin: 18px 0 24px; }

/* Event identity stays centered independently of the side controls. */
.site-header { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 24px; height: 96px; }
.site-header .brand { justify-self: start; }
.event-identity { display: flex; flex-direction: column; align-items: center; gap: 5px; text-align: center; white-space: nowrap; text-decoration: none; }
.event-home { display: flex; flex-direction: column; align-items: center; gap: 5px; text-decoration: none; }
.event-home:hover .event-name { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.event-hosts { color: var(--muted); font: 400 12px/1.5 var(--sans); letter-spacing: .1px; white-space: normal; }
.event-hosts strong { color: var(--ink); font-weight: 600; white-space: nowrap; }
.archive-home-link { color: var(--muted); font-size: 12px; text-decoration: none; }
.archive-home-link:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.event-name { color: var(--ink); font: 600 clamp(27px, 2.15vw, 36px)/1.1 'Cinzel', var(--serif); letter-spacing: .035em; text-transform: uppercase; }
.event-date { color: var(--muted); font: 500 9px/1.4 var(--sans); letter-spacing: 2.5px; text-transform: uppercase; }
.site-header .header-actions { justify-self: end; gap: 14px; }

/* The room extends beyond the framed sculpture, with quiet stone and fluting. */
.home { position: relative; isolation: isolate; }
.home::before,.home::after { content: ''; position: absolute; z-index: -1; inset: 0; pointer-events: none; }
.home::before { background: url('marble-veins.svg') center / cover no-repeat; opacity: .25; }
.home::after {
  background-image: url('fluted-pilaster.svg'),url('fluted-pilaster.svg');
  background-repeat: no-repeat;
  background-position: left -16px top 30px,right -16px top 30px;
  background-size: clamp(76px, 5.1vw, 116px) calc(100% - 60px);
  opacity: .25; filter: brightness(1.7);
  mask-image: linear-gradient(180deg, transparent, #000 7%, #000 90%, transparent);
}
:root[data-theme="day"] .home::before { opacity: .4; }
:root[data-theme="day"] .home::after { opacity: .38; filter: none; }

/* The introduction and the question map share one grid row and one outer height. */
.home>.home-feature,.home>.topic-map { min-width: 0; align-self: stretch; }
.home .hero-copy { flex-shrink: 0; }
.home>.topic-map {
  display: grid; grid-template-rows: repeat(6, minmax(min-content, 1fr)) auto;
  margin: 0; padding: 16px 20px;
}
.home>.topic-map::before,.home>.topic-map>.frame-corners { inset: 0; }
.home>.topic-map::after { inset: 6px; }
.home .map-caption { align-self: end; margin-top: 16px; }
@media (min-width:1001px) {
  .home { grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr); min-height: calc(100svh - 148px); }
  .home>.home-feature { min-height: 0; }
}
@media (max-width:600px) {
  .home>.topic-map { padding: 12px 16px; }
}
@media (max-width:1150px) {
  .site-header { gap: 18px; }
  .site-header .header-actions { gap: 9px; }
  .site-header .small-button { font-size: 11px; }
  .event-name { font-size: 29px; }
  .event-date { font-size: 8px; letter-spacing: 2px; }
}
@media (max-width:900px) {
  .site-header { grid-template-columns: 1fr auto; height: auto; padding-top: 16px; padding-bottom: 14px; gap: 16px; }
  .event-identity { grid-column: 1 / -1; grid-row: 1; }
  .site-header .brand { grid-column: 1; grid-row: 2; }
  .site-header .header-actions { grid-column: 2; grid-row: 2; }
  .home::after { background-size: 72px calc(100% - 60px); opacity: .15; }
  :root[data-theme="day"] .home::after { opacity: .23; }
}
@media (max-width:600px) {
  .site-header { gap: 12px; padding-left: 5vw; padding-right: 5vw; }
  .site-header .brand { font-size: 14px; gap: 7px; }
  .site-header .header-actions { gap: 7px; }
  .site-header .header-actions .small-button { font-size: 10px; }
  .event-name { font-size: 28px; }
  .home::before { background-size: auto 100%; }
  .home::after { display: none; }
}
@media (max-width:380px) {
  .site-header .brand { font-size: 12px; gap: 5px; }
  .site-header .mark { width: 24px; height: 30px; }
  .site-header .header-actions { gap: 4px; }
}
@media print { .site-header,.home::before,.home::after { display: none; } }