/* Theory and Practice of Emerging Technology Innovation — course site
   Layout: left-aligned pages on a wide frame; speaker portraits carry the color, gold marks labels and actions. */

:root {
  --paper: #ffffff;
  --fill: #f3f1ec;
  --ink: #15140f;
  --ink-2: #48443a;
  --muted: #736b5c;
  --line: #e4dfd3;
  --gold: #b39150;
  --gold-ink: #7a5f2c;
  --band: #15140f;
  --band-ink: #f3efe5;
  --band-muted: #b5ac98;
  --band-gold: #d4b574;
  --band-line: #34312a;
  --band-edge: transparent;

  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --f-mono: "DM Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --page: 1240px;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f0e0b;
    --fill: #1b1a16;
    --ink: #f2eee5;
    --ink-2: #c8c1b1;
    --muted: #9d9582;
    --line: #2d2b25;
    --gold: #c9a964;
    --gold-ink: #d8bc80;
    --band: #1b1a16;
    --band-ink: #f2eee5;
    --band-muted: #a9a08c;
    --band-gold: #d8bc80;
    --band-line: #36332c;
    --band-edge: #2d2b25;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f0e0b;
  --fill: #1b1a16;
  --ink: #f2eee5;
  --ink-2: #c8c1b1;
  --muted: #9d9582;
  --line: #2d2b25;
  --gold: #c9a964;
  --gold-ink: #d8bc80;
  --band: #1b1a16;
  --band-ink: #f2eee5;
  --band-muted: #a9a08c;
  --band-gold: #d8bc80;
  --band-line: #36332c;
  --band-edge: #2d2b25;
  color-scheme: dark;
}
@media (min-width: 760px) {
  :root {
    --gutter-l: max(40px, env(safe-area-inset-left, 0px));
    --gutter-r: max(40px, env(safe-area-inset-right, 0px));
  }
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--f-body);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}
h1, h2, h3 { margin: 0; text-wrap: balance; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap {
  max-width: var(--page);
  margin-inline: auto;
  padding-left: var(--gutter-l);
  padding-right: var(--gutter-r);
}
.skip {
  position: absolute;
  left: var(--gutter-l);
  top: -100px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
  font: 500 0.875rem/1 var(--f-display);
  z-index: 20;
}
.skip:focus { top: 8px; }

/* Type roles */
.eyebrow {
  font: 500 0.75rem/1.4 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold-ink);
}
.display {
  font-family: var(--f-display);
  font-stretch: 112%;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 0.98;
}
.h2 {
  font-family: var(--f-display);
  font-stretch: 108%;
  font-weight: 750;
  font-size: clamp(1.75rem, 1.1rem + 2.4vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
}
.lede {
  font-size: clamp(1.125rem, 1rem + 0.45vw, 1.375rem);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 40em;
}
.prose { max-width: 38em; color: var(--ink-2); }
.prose p + p { margin-top: 1em; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 32px;
  padding-block: 18px;
}
.brand {
  display: grid;
  gap: 2px;
  text-decoration: none;
  min-width: 0;
}
.brand-code {
  font: 500 0.6875rem/1.2 var(--f-mono);
  letter-spacing: 0.08em;
  color: var(--gold-ink);
}
.brand-name {
  font: 700 1rem/1.15 var(--f-display);
  font-stretch: 108%;
  letter-spacing: -0.01em;
}
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 24px; }
.site-nav a {
  font: 500 0.9375rem/1 var(--f-display);
  text-decoration: none;
  color: var(--ink-2);
  padding-block: 8px;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--gold); }
.site-nav .ext::after { content: "\2197"; margin-left: 0.2em; color: var(--gold-ink); }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  min-height: 46px;
  padding: 0 20px;
  border: 1.5px solid var(--ink);
  font: 600 0.9375rem/1 var(--f-display);
  font-stretch: 104%;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: transparent; color: var(--ink); }
.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* Sections */
.section { padding-block: clamp(56px, 7vw, 104px); }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: grid; gap: 14px; margin-bottom: clamp(28px, 4vw, 48px); }

/* Home hero */
.hero { padding-block: clamp(40px, 6vw, 88px) clamp(40px, 5vw, 72px); }
.hero-copy { display: grid; gap: 22px; }
.hero-pre {
  display: block;
  font: italic 400 clamp(1.375rem, 1rem + 1.6vw, 2.25rem)/1.1 var(--f-body);
  letter-spacing: 0;
  color: var(--ink-2);
  margin-bottom: 0.18em;
}
.hero-title { font-size: clamp(2.5rem, 1rem + 5.4vw, 5.5rem); }
.hero-copy .lede { margin-top: 4px; }
.hero-copy .actions { margin-top: 6px; }

/* Contact sheet of speaker faces */
.faces { margin-top: clamp(40px, 5vw, 64px); }
.section > .faces { margin-top: 0; }
.faces-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  margin-bottom: 16px;
}
.faces-head a {
  font: 600 0.9375rem/1.2 var(--f-display);
  text-decoration: none;
  color: var(--ink);
}
.faces-head a:hover { text-decoration: underline; }
/* 12 faces fill 3, 4 or 6 columns; 13–14 fill two rows of 7 on wide screens; 8 faces fill 4 or a single row of 8 */
.face-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 12px;
}
.face-grid[data-count="8"] { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (min-width: 640px) { .face-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 1000px) {
  .face-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 22px 14px; }
  .face-grid[data-count="8"] { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .face-grid[data-count="13"], .face-grid[data-count="14"] { grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 20px 12px; }
}
.face { display: grid; gap: 8px; align-content: start; text-decoration: none; min-width: 0; }
.face img, .card-photo img {
  width: 100%;
  background: var(--fill);
  filter: grayscale(1) contrast(1.04);
  transition: filter 0.3s ease;
}
.face img { aspect-ratio: 1 / 1; object-fit: cover; }
.face:hover img, .face:focus-visible img,
.card:hover .card-photo img, .card:focus-within .card-photo img { filter: none; }
.face-name {
  font: 500 0.6875rem/1.35 var(--f-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.face-org { display: block; color: var(--muted); text-transform: none; letter-spacing: 0.01em; }
@media (max-width: 639px) { .face-grid[data-count="8"] .face-org { display: none; } }

/* Organizations band */
.orgs { border-block: 1px solid var(--line); padding-block: 28px; }
.orgs-row { display: grid; gap: 10px; }
.org-list {
  font: 600 clamp(1rem, 0.9rem + 0.5vw, 1.25rem)/1.6 var(--f-display);
  font-stretch: 104%;
  color: var(--ink);
}
.org-list .org { white-space: nowrap; }
.org-list .sep { color: var(--gold); font-weight: 400; padding-inline: 0.45em 0.2em; }

/* Course section */
.split { display: grid; gap: 28px 64px; }
@media (min-width: 960px) { .split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: start; } }
.pillars {
  display: grid;
  gap: 32px;
  margin-top: clamp(40px, 5vw, 64px);
}
@media (min-width: 820px) { .pillars { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; } }
.pillar { display: grid; gap: 10px; align-content: start; padding-top: 18px; border-top: 2px solid var(--ink); min-width: 0; }
.pillar h3 { font: 700 1.1875rem/1.2 var(--f-display); font-stretch: 106%; }
.pillar p { color: var(--ink-2); }

.tech { margin-top: clamp(48px, 6vw, 80px); display: grid; gap: 14px; }
.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  font: 650 clamp(1.25rem, 0.95rem + 1.3vw, 2rem)/1.25 var(--f-display);
  font-stretch: 108%;
  letter-spacing: -0.01em;
}
.tech-list li:not(:last-child)::after {
  content: "/";
  color: var(--gold);
  font-weight: 300;
  padding-inline: 0.4em;
}

/* Summit band */
.band { background: var(--band); color: var(--band-ink); border-block: 1px solid var(--band-edge); }
.band .eyebrow { color: var(--band-gold); }
.band .lede, .band .prose { color: var(--band-muted); }
.summit, .band-pad { padding-block: clamp(56px, 7vw, 104px); }
.summit-grid { display: grid; gap: 32px 64px; }
@media (min-width: 960px) { .summit-grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: end; } }
.summit-copy { display: grid; gap: 18px; }
.band .btn { border-color: var(--band-ink); color: var(--band-ink); }
.band .btn:hover { background: var(--band-ink); color: var(--band); }
.summit-people { display: grid; gap: 0; border-top: 1px solid var(--band-line); }
.summit-people li {
  display: grid;
  gap: 2px;
  padding-block: 12px;
  border-bottom: 1px solid var(--band-line);
}
.summit-people b { font: 650 1rem/1.3 var(--f-display); font-stretch: 104%; color: var(--band-ink); }
.summit-people span { font: 400 0.8125rem/1.4 var(--f-mono); color: var(--band-muted); }

/* Instructor */
.instructor { display: grid; gap: 24px 40px; align-items: start; }
@media (min-width: 720px) { .instructor { grid-template-columns: 200px minmax(0, 1fr); } }
.instructor img { width: 200px; max-width: 100%; aspect-ratio: 4 / 5; object-fit: cover; background: var(--fill); }
.instructor-copy { display: grid; gap: 12px; }
.instructor-name { font: 750 clamp(1.5rem, 1.2rem + 1vw, 2rem)/1.1 var(--f-display); font-stretch: 108%; }
.instructor-role { font: 500 0.8125rem/1.5 var(--f-mono); color: var(--muted); }

/* Closing call to action */
.cta { display: grid; gap: 20px; }
@media (min-width: 900px) { .cta { grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 40px; } }
.cta-copy { display: grid; gap: 14px; }

/* Page intro (Speakers, Speak) */
.page-intro { padding-block: clamp(40px, 6vw, 88px) clamp(32px, 4vw, 56px); display: grid; gap: 18px; }
.page-title { font-size: clamp(2.75rem, 1rem + 6vw, 5.75rem); }

/* Speaker roster */
.roster {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px 16px;
  padding-bottom: clamp(56px, 7vw, 104px);
}
@media (min-width: 760px) { .roster { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 48px 28px; } }
@media (min-width: 1100px) { .roster { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.card { display: grid; gap: 14px; align-content: start; min-width: 0; scroll-margin-top: 24px; }
.card-photo { display: block; overflow: hidden; background: var(--fill); }
.card-photo img { aspect-ratio: 4 / 5; object-fit: cover; }
.card-body { display: grid; gap: 6px; min-width: 0; }
.card-field { font: 500 0.6875rem/1.3 var(--f-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--gold-ink); }
.card-name { font: 700 clamp(1.0625rem, 0.95rem + 0.5vw, 1.3125rem)/1.15 var(--f-display); font-stretch: 106%; letter-spacing: -0.005em; }
.card-name a { text-decoration: none; }
.card-name a:hover { text-decoration: underline; }
.card-role { font-size: 0.9375rem; line-height: 1.45; color: var(--ink-2); }
.card-role .org { display: block; color: var(--ink); font-weight: 600; }

/* Last roster tile: an invitation that fills out the final row */
.roster-cta {
  grid-column: span var(--span-2, 2);
  display: grid;
  align-content: end;
  gap: 10px;
  min-height: 220px;
  padding: clamp(20px, 3vw, 32px);
  background: var(--band);
  color: var(--band-ink);
  border: 1px solid var(--band-edge);
  text-decoration: none;
}
.roster-cta .eyebrow { color: var(--band-gold); }
.roster-cta-title {
  font: 750 clamp(1.375rem, 1.1rem + 1.2vw, 2rem)/1.08 var(--f-display);
  font-stretch: 108%;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.roster-cta-link { font: 600 0.9375rem/1.3 var(--f-display); color: var(--band-gold); }
.roster-cta .arrow { display: inline-block; transition: transform 0.15s ease; }
.roster-cta:hover .arrow { transform: translateX(4px); }
@media (min-width: 760px) { .roster-cta { grid-column: span var(--span-3, 3); } }
@media (min-width: 1100px) { .roster-cta { grid-column: span var(--span-4, 4); } }

/* Site visits (speakers page) */
.visits { display: grid; gap: 14px; padding-bottom: clamp(56px, 7vw, 104px); }

/* Speak page */
.facts { display: grid; gap: 0; border-top: 2px solid var(--ink); }
.fact {
  display: grid;
  gap: 8px 48px;
  padding-block: 24px;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 820px) { .fact { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); } }
.fact dt { font: 700 1.1875rem/1.25 var(--f-display); font-stretch: 106%; }
.fact dd { margin: 0; color: var(--ink-2); max-width: 38em; }

.contact { display: grid; gap: 16px; padding: clamp(24px, 4vw, 44px); background: var(--fill); }
.contact-line { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
.email {
  font: 500 clamp(1rem, 0.85rem + 0.8vw, 1.375rem)/1.3 var(--f-mono);
  user-select: all;
  -webkit-user-select: all;
  overflow-wrap: anywhere;
}
.copy-btn {
  min-height: 38px;
  padding: 0 14px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: 600 0.8125rem/1 var(--f-display);
  cursor: pointer;
}
.copy-btn:hover { background: var(--ink); color: var(--paper); }
.copy-status { font: 400 0.8125rem/1.3 var(--f-mono); color: var(--muted); min-height: 1.3em; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding-block: 32px 40px; }
.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
  font: 400 0.8125rem/1.6 var(--f-mono);
  color: var(--muted);
}
.footer-row a { color: var(--ink-2); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

/* Roster tile for a speaker without a photo yet */
.card-initials {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 5;
  font: 800 clamp(2.5rem, 2rem + 2vw, 3.5rem)/1 var(--f-display);
  font-stretch: 112%;
  color: var(--muted);
}