/* Applied Mathematics Seminar, The University of Alabama
   Hand-written stylesheet, adapted from the UASAM 2026 meeting site
   (github.com/JiaZhaoMath/UASAM2026) so the two sites look alike.
   No frameworks, no external fonts or scripts.

   Page structure: each top-level block (masthead, nav, section, footer) is a
   full-bleed "band" that carries the background; an inner .wrap holds the
   measure. Sections alternate paper / tint and each opens with a crimson rule,
   so every section reads as its own block. */

:root {
  --crimson: #9e1b32;          /* UA crimson */
  --crimson-deep: #7a1427;
  --crimson-wash: #eddfe3;     /* shading for breaks in the schedule */
  --on-crimson: #ffffff;       /* text on a crimson button: 7.9:1, hover 10.7:1 */
  --paper: #ffffff;
  --band: #f5f1f2;             /* alternating section background */
  --ink: #000000;
  --ink-body: #2a2a2a;
  --ink-muted: #5f5f5f;
  --rule: #d6d6d6;
  --rule-strong: #8a8a8a;
  --tbd-bg: #fff4c2;
  --tbd-ink: #5a4300;
  --sticky-shadow: 0 1px 0 rgba(0, 0, 0, 0.09), 0 6px 14px rgba(0, 0, 0, 0.07);
  --measure: 62rem;
  --measure-wide: 78rem;
  --nav-height: 4.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --crimson: #e2647b;
    --crimson-deep: #f08ea0;
    --crimson-wash: #3d1922;
    --on-crimson: #161616;     /* dark text on the light dark-mode pink: 5.5:1, hover 7.8:1 */
    --paper: #161616;
    --band: #1e1a1c;
    --ink: #ffffff;
    --ink-body: #dcdcdc;
    --ink-muted: #a3a3a3;
    --rule: #3a3a3a;
    --rule-strong: #7a7a7a;
    --tbd-bg: #4a3a00;
    --tbd-ink: #ffe9a3;
    --sticky-shadow: 0 1px 0 rgba(0, 0, 0, 0.6), 0 6px 14px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }

html { color-scheme: light dark; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-body);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, "Times New Roman", serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  border-top: 0.6rem solid var(--crimson);
}

a {
  color: var(--crimson);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}
a:hover { color: var(--crimson-deep); }
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--crimson);
  outline-offset: 3px;
}

/* Keep anything scrolled to by a link or by keyboard focus clear of the
   pinned navigation bar. */
:is(a, summary, [tabindex]) { scroll-margin-top: calc(var(--nav-height) + 1rem); }

/* Bands and the measure inside them */

.wrap {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

.band { padding: 4.5rem 0; }
.band--tint { background: var(--band); }

@media (max-width: 34rem) {
  .wrap { padding-left: 1.25rem; padding-right: 1.25rem; }
  .band { padding: 3rem 0; }
}

/* Masthead */

.masthead { padding: 3rem 0 3.25rem; }

.masthead h1 {
  margin: 0;
  color: var(--ink);
  font-weight: 400;
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.masthead .when-where {
  margin: 1.25rem 0 0;
  font-size: 1.25rem;
  line-height: 1.45;
  color: var(--ink);
}
.masthead .when-where span { display: block; }
.masthead .when-where .date { font-weight: 700; }

.masthead .tentative {
  margin: 1rem 0 0;
  color: var(--ink-muted);
  max-width: var(--measure);
}

.actions {
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}
.actions a.primary {
  display: inline-block;
  background: var(--crimson);
  color: var(--on-crimson);
  padding: 0.6rem 1.1rem;
  text-decoration: none;
  border-radius: 2px;
}
.actions a.primary:hover { background: var(--crimson-deep); color: var(--on-crimson); }
.actions li { display: flex; align-items: center; }

/* In-page navigation, pinned to the top while scrolling */

.toc {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: 0;
  padding: 0.8rem 0;
  background: var(--paper);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule);
}
.toc.is-stuck {
  border-top-color: transparent;
  box-shadow: var(--sticky-shadow);
}
.toc .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 2rem;
}
.toc-home {
  color: var(--ink-muted);
  font-size: 0.95rem;
  text-decoration: none;
}
.toc-home:hover { color: var(--crimson); text-decoration: underline; }
@media (max-width: 48rem) { .toc-home { display: none; } }

.toc ul {
  margin: 0 0 0 auto;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.6rem;
}
.toc a:not(.toc-home) {
  display: inline-block;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 2px solid transparent;
}
.toc a:not(.toc-home):hover {
  color: var(--crimson);
  border-bottom-color: var(--rule-strong);
}
.toc a.is-current {
  color: var(--crimson);
  font-weight: 700;
  border-bottom-color: var(--crimson);
}

/* Keep the pinned bar to a single row on a phone: it stays on screen the whole
   time, so it must not eat the viewport. The site has no JavaScript, so
   --nav-height is a fixed estimate of the bar's height at this width. */
@media (max-width: 34rem) {
  :root { --nav-height: 6.5rem; }
  .toc { padding: 0.6rem 0; }
  .toc ul { gap: 0.25rem 1rem; font-size: 0.95rem; }
}

/* Sections */

section { scroll-margin-top: var(--nav-height); }

h2 {
  margin: 0 0 1.25rem;
  color: var(--ink);
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.015em;
}
section h2::before {
  content: "";
  display: block;
  width: 3.5rem;
  height: 3px;
  margin-bottom: 1.1rem;
  background: var(--crimson);
}

h3 {
  margin: 1.75rem 0 0.5rem;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.125rem;
}

p, ul, ol, dl { max-width: var(--measure); }
p { margin: 0 0 1rem; }

/* Masthead additions */

.masthead .kicker {
  margin: 0 0 0.6rem;
  color: var(--crimson);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Talk cards */

.talk {
  max-width: var(--measure);
  padding: 1.25rem 0 1.35rem;
  border-bottom: 1px solid var(--rule);
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}
.talk:first-of-type { border-top: 1px solid var(--rule-strong); }
.talk:target {
  background: var(--crimson-wash);
  box-shadow: -1rem 0 0 var(--crimson-wash), 1rem 0 0 var(--crimson-wash);
}

.talk-when {
  margin: 0 0 0.35rem;
  color: var(--crimson);
  font-variant-numeric: tabular-nums;
}
.talk-when time { font-weight: 700; }
.sep { color: var(--ink-muted); }

.talk-note {
  display: inline-block;
  margin: 0.1rem 0 0.6rem;
  padding: 0.1rem 0.55rem;
  background: var(--tbd-bg);
  color: var(--tbd-ink);
  border-radius: 2px;
  font-weight: 700;
  font-size: 0.95rem;
}

.talk-title {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
  line-height: 1.3;
  text-wrap: pretty;
}

.talk-speaker { margin: 0 0 0.4rem; }
.talk-speaker .name { color: var(--ink); font-weight: 700; }
.talk-speaker .name + .aff::before { content: ", "; }
.talk-speaker .aff { color: var(--ink-muted); }

.talk-reserved {
  margin: 0;
  color: var(--ink-muted);
  font-style: italic;
}

.talk details { margin: 0.35rem 0 0; }
.talk summary {
  cursor: pointer;
  color: var(--crimson);
  width: max-content;
  max-width: 100%;
}
.talk summary:hover { color: var(--crimson-deep); text-decoration: underline; }
.talk details p { margin: 0.5rem 0 0; }
.talk details[open] { padding-bottom: 0.4rem; }

.talk-links {
  margin: 0.6rem 0 0;
  font-size: 0.95rem;
}

/* Open dates */

.open-dates {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  max-width: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(8.5rem, 1fr));
  gap: 0.5rem;
}
.open-dates li {
  padding: 0.45rem 0.7rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--crimson);
  font-variant-numeric: tabular-nums;
}
.band--tint .open-dates li { background: var(--paper); }

/* About */

dl { margin: 0 0 1rem; }
dt { font-weight: 700; color: var(--ink); margin-top: 0.75rem; }
dd { margin: 0.15rem 0 0; }

.years {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}
.years [aria-current] { font-weight: 700; color: var(--ink); }

footer {
  padding: 1.75rem 0;
  border-top: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: 0.95rem;
}
footer p { margin: 0; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media print {
  body { border-top: none; color: #000; }
  .actions, .toc, .talk-links { display: none; }
  a { color: #000; text-decoration: none; }
  .band { padding: 1.25rem 0; }
  .band--tint, .talk:target { background: none; box-shadow: none; }
  section h2::before { background: #000; }
  .talk { break-inside: avoid; }
}

/* Flyer pages (flyers/<date>.html): one talk, one printed page */

body.flyer { border-top: none; background: var(--band); }

.flyer-back {
  max-width: 8.5in;
  margin: 1rem auto 0;
  padding: 0 1rem;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.flyer-page {
  box-sizing: border-box;
  max-width: 8.5in;
  min-height: 11in;
  margin: 1rem auto 2rem;
  padding: 0.7in 0.75in 0.6in;
  background: var(--paper);
  border-top: 0.45in solid var(--crimson);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
}

.flyer-head { margin-bottom: 1.4rem; }
.flyer-series {
  margin: 0;
  color: var(--crimson);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.1;
}
.flyer-dept { margin: 0.2rem 0 0; color: var(--ink-muted); }

.flyer-when {
  margin: 0 0 1.25rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.6rem;
}

.flyer-note {
  margin: -0.5rem 0 1.1rem;
  padding: 0.3rem 0.6rem;
  background: var(--tbd-bg);
  color: var(--tbd-ink);
  font-weight: 700;
}

.flyer-title {
  margin: 0 0 0.9rem;
  color: var(--ink);
  font-size: 2rem;
  line-height: 1.15;
  font-weight: 700;
  text-wrap: balance;
}
.flyer-speaker { margin: 0; color: var(--ink); font-size: 1.35rem; font-weight: 700; }
.flyer-aff { margin: 0.1rem 0 0; color: var(--ink-muted); font-size: 1.05rem; }

.flyer-page section { margin-top: 1.3rem; }
.flyer-page h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--crimson);
}
.flyer-page section p { margin: 0 0 0.6rem; max-width: none; text-align: justify; hyphens: auto; }

.flyer--dense { font-size: 0.95rem; line-height: 1.45; }
.flyer--dense .flyer-title { font-size: 1.7rem; }
.flyer--compact { font-size: 0.82rem; line-height: 1.34; }
.flyer--compact .flyer-head { margin-bottom: 0.9rem; }
.flyer--compact .flyer-when { font-size: 1.05rem; margin-bottom: 0.9rem; }
.flyer--compact .flyer-title { font-size: 1.45rem; }
.flyer--compact .flyer-speaker { font-size: 1.2rem; }
.flyer--compact section { margin-top: 0.8rem; }
.flyer-page section h2::before { display: none; }

.flyer-foot {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  color: var(--ink-muted);
}

@media (max-width: 34rem) {
  .flyer-page { padding: 1.25rem 1rem; min-height: 0; border-top-width: 0.6rem; }
  .flyer-title { font-size: 1.5rem; }
}

@page { size: letter; margin: 0.5in; }

@media print {
  body.flyer { background: #fff; }
  .flyer-back { display: none; }
  .flyer-page {
    max-width: none;
    min-height: 9.85in;
    margin: 0;
    padding: 0;
    padding-top: 0.25in;
    background: #fff;
    box-shadow: none;
    border-top: 0.3in solid #9e1b32;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  .flyer-series, .flyer-page h2 { color: #9e1b32; }
  .flyer-page, .flyer-title, .flyer-speaker, .flyer-when { color: #000; }
  .flyer-aff, .flyer-dept, .flyer-foot { color: #444; }
  .flyer-note { background: #fff4c2; color: #000; }
}