/**
 * APS Archive Branding CSS
 * Version: 1.0.0 (Proof of Concept)
 *
 * Styles the archive.aps.org site to match the branding and design
 * patterns of the schedule.aps.org (www.aps.org/events/calendar/)
 *
 * No HTML modifications required - uses element selectors only
 */

/* ============================================================================
   1. FONT LOADING
   ============================================================================ */

/* Jost Variable Font from Google Fonts */
@import url("https://fonts.googleapis.com/css2?family=Jost:ital,wght@0,100..900;1,100..900&display=swap");

/* ============================================================================
   2. CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================================================ */

:root {
  /* Primary Blue Palette */
  --aps-primary-300: #8fb4d1;
  --aps-primary-400: #6093b9;
  --aps-primary-500: #3073a2;
  --aps-primary-600: #00538b;
  --aps-primary-700: #004069;

  /* Neutral Grays */
  --aps-neutral-100: #f2f2f2;
  --aps-neutral-200: #d0d0d0;
  --aps-neutral-400: #8d8d8d;
  --aps-neutral-600: #49494a;
  --aps-neutral-700: #2e2f35;
  --aps-neutral-900: #1d1e27;

  /* Typography */
  --aps-font-default: 350;
  --aps-font-heading: 600;
  --aps-font-link: 500;

  /* Fluid Typography */
  --aps-text-sm: clamp(0.8409rem, 0.1766vw + 0.8056rem, 0.9186rem);
  --aps-text-base: clamp(1rem, 0.2841vw + 0.9432rem, 1.125rem);
  --aps-text-lg: clamp(1.1892rem, 0.4286vw + 1.1035rem, 1.3778rem);
  --aps-text-xl: clamp(1.4142rem, 0.6209vw + 1.29rem, 1.6874rem);
  --aps-text-2xl: clamp(1.6818rem, 0.8745vw + 1.5069rem, 2.0665rem);
  --aps-text-3xl: clamp(2rem, 1.2067vw + 1.7586rem, 2.5309rem);
  --aps-text-4xl: clamp(2.3783rem, 1.6391vw + 2.0505rem, 3.0996rem);

  /* Line Heights */
  --aps-leading-default: 1.6;
  --aps-leading-heading: 1.1;

  /* Letter Spacing */
  --aps-tracking-default: 0.02em;
  --aps-tracking-heading: -0.02em;

  /* Spacing Scale */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Container */
  --container-max: 80rem;
  --container-padding: 1rem;
}

@media (min-width: 1024px) {
  :root {
    --container-padding: 4rem; /* 64px on desktop */
  }
}

/* ============================================================================
   3. RESET & BASE STYLES
   ============================================================================ */

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding-inline: 20px;
  padding-block: 0px;
  font-family:
    "Jost",
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  font-weight: var(--aps-font-default);
  font-size: var(--aps-text-base);
  line-height: var(--aps-leading-default);
  letter-spacing: var(--aps-tracking-default);
  color: var(--aps-neutral-900);
  background-color: #ffffff;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
   4. TYPOGRAPHY
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--aps-font-heading);
  line-height: var(--aps-leading-heading);
  letter-spacing: var(--aps-tracking-heading);
  margin-top: 0;
  color: var(--aps-neutral-900);
}

h1 {
  font-size: var(--aps-text-3xl);
  margin-bottom: 0.8em;
}

h2 {
  font-size: var(--aps-text-2xl);
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

h3 {
  font-size: var(--aps-text-xl);
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

p {
  margin-top: 1.25em;
  margin-bottom: 1.25em;
}

strong,
b {
  font-weight: var(--aps-font-heading);
}

/* Links */
a {
  color: var(--aps-primary-600);
  font-weight: var(--aps-font-link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--aps-primary-400);
  outline-offset: 2px;
}

/* ============================================================================
   5. LAYOUT - HEADER
   ============================================================================ */

/* header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--aps-neutral-200);
} */

header > a {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  max-width: var(--container-max);
  margin: 0 auto;
  text-decoration: none;
}

@media (min-width: 1024px) {
  header > a {
    padding: var(--spacing-md) var(--container-padding);
    min-height: 6rem;
    align-items: flex-end;
  }
}

/* Logo */
header img {
  height: 55px;
  width: auto;
  display: block;
  margin-right: var(--spacing-md);
}

@media (min-width: 1280px) {
  header img {
    height: 75px;
  }
}

/* Header title "APS Meeting Archive" */
header h1 {
  font-size: var(--aps-text-xl);
  margin: 0;
  color: var(--aps-primary-600);
  font-weight: var(--aps-font-heading);
}

@media (min-width: 1024px) {
  header h1 {
    font-size: var(--aps-text-2xl);
    margin-bottom: 0.25rem;
  }
}

/* ============================================================================
   6. LAYOUT - NAVIGATION (Breadcrumbs)
   ============================================================================ */

/* Breadcrumb card styling */
nav.breadcrumbs {
  background-color: #ffffff;
  border: 1px solid var(--aps-neutral-200);
  border-radius: 0.375rem;
  padding: var(--spacing-md);
  margin: var(--spacing-md) auto;
  max-width: var(--container-max);
}

nav ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  font-size: var(--aps-text-sm);
  max-width: var(--container-max);
  margin: 0 auto;
}

/* Breadcrumb list - left-aligned within card */
nav.breadcrumbs ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  font-size: var(--aps-text-sm);
  max-width: none;
}

nav ol li {
  display: inline-flex;
  align-items: center;
}

nav ol li:not(:last-child)::after {
  content: "/";
  margin: 0 0.5em;
  color: var(--aps-neutral-400);
  font-weight: var(--aps-font-default);
}

/* Breadcrumb links */
nav a {
  color: var(--aps-primary-600);
  font-weight: var(--aps-font-link);
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

/* Current page (last breadcrumb, no link) */
nav li:last-child {
  color: var(--aps-neutral-600);
  font-weight: var(--aps-font-default);
}

/* ============================================================================
   7. LAYOUT - MAIN CONTENT
   ============================================================================ */

main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-sm);
  min-height: 60vh;
}

@media (min-width: 1024px) {
  main {
    padding: var(--spacing-2xl) var(--container-padding);
  }
}

/* Main page title (h1 in main) */
main > h1 {
  font-size: var(--aps-text-4xl);
  color: var(--aps-primary-600);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  /* border-bottom: 2px solid var(--aps-primary-400); */
}

/* Introductory paragraph */
main > p:first-of-type {
  font-size: var(--aps-text-lg);
  color: var(--aps-neutral-700);
  margin-bottom: var(--spacing-xl);
}

/* ============================================================================
   8. LISTS - Conference Series, Years, Sessions
   ============================================================================ */

/* Main content lists (conference series, years) */
main > ul,
main > section > ul {
  list-style: none;
  padding: 0;
  margin: var(--spacing-xl) 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

main > ul > li,
main > section > ul > li {
  background-color: #ffffff;
  border: 1px solid var(--aps-neutral-200);
  border-radius: 0.25rem;
}

main > ul > li > a,
main > section > ul > li > a {
  display: block;
  padding: var(--spacing-lg);
  font-size: var(--aps-text-lg);
  font-weight: var(--aps-font-heading);
  color: var(--aps-primary-600);
  text-decoration: none;
}

main > ul > li > a:hover,
main > section > ul > li > a:hover {
  color: var(--aps-primary-500);
  text-decoration: none;
}

/* ============================================================================
   9. SESSIONS PAGE - Session Cards
   ============================================================================ */

/* Session containers on meeting year page */
main > section {
  background-color: #ffffff;
  border: 1px solid var(--aps-neutral-200);
  border-radius: 0.375rem;
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

/* Session title (h3 with link) */
main > section > h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

main > section > h3 > a {
  font-size: var(--aps-text-xl);
  color: var(--aps-primary-600);
  font-weight: var(--aps-font-heading);
  text-decoration: none;
}

main > section > h3 > a:hover {
  text-decoration: underline;
}

/* Session metadata (date, time, room, presentation count) */
main > section > p {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: var(--aps-text-sm);
  color: var(--aps-neutral-600);
  margin: var(--spacing-sm) 0;
}

main > section > p > span {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  background-color: var(--aps-neutral-100);
  border-radius: 0.25rem;
  font-weight: var(--aps-font-link);
}

/* Add icons using pseudo-elements for metadata */
main > section > p > span:nth-child(1)::before {
  content: "📅 ";
  margin-right: 0.25rem;
}

main > section > p > span:nth-child(2)::before {
  content: "🕐 ";
  margin-right: 0.25rem;
}

main > section > p > span:nth-child(3)::before {
  content: "📍 ";
  margin-right: 0.25rem;
}

main > section > p > span:nth-child(4)::before {
  content: "📄 ";
  margin-right: 0.25rem;
}

/* Event tags (event type and code) */
article header .event-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-sm) 0;
  font-size: var(--aps-text-sm);
}

article header .event-tags .tag {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  background-color: var(--aps-primary-500);
  color: white;
  border-radius: 9999px;
  font-weight: var(--aps-font-default);
  font-size: var(--aps-text-sm);
  line-height: 1;
}

/* Conference Overview - inline labels and values */
#conference-overview-heading + article > dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-sm) var(--spacing-md);
  align-items: baseline;
}

#conference-overview-heading + article > dl > dt {
  font-weight: var(--aps-font-heading);
  margin: 0;
  grid-column: 1;
}

#conference-overview-heading + article > dl > dd {
  margin: 0;
  grid-column: 2;
}

/* ============================================================================
   10. SESSION DETAIL PAGE - Metadata & Presentations
   ============================================================================ */

/* Session ID paragraph right after h1 */
main > h1 + p {
  font-size: var(--aps-text-sm);
  color: var(--aps-neutral-600);
  font-weight: var(--aps-font-link);
  margin-top: -0.5rem;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--aps-neutral-100);
  border-radius: 0.25rem;
  display: inline-block;
}

/* Metadata sections (Schedule, Presider, Location, Sponsoring Units) */
main > section > h2 {
  font-size: var(--aps-text-lg);
  color: var(--aps-primary-600);
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  /* border-bottom: 1px solid var(--aps-neutral-200); */
}

main > section > h2:first-child {
  margin-top: 0;
}

main > section > h3 + p {
  font-size: var(--aps-text-sm);
  color: var(--aps-neutral-600);
  margin-top: 0;
}

/* "Presenter:" and "Authors:" labels */
main > section > p > strong {
  color: var(--aps-primary-600);
  font-weight: var(--aps-font-heading);
}

/* ============================================================================
   11. ABSTRACT/PRESENTATION PAGE
   ============================================================================ */

/* Abstract content section */
main > section:has(> h2:first-child) {
  background-color: var(--aps-neutral-100);
  border-color: transparent;
  border-left: 3px solid var(--aps-primary-600);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  border-radius: 0.25rem;
}

/* Abstract heading */
main > section > h2:first-of-type {
  color: var(--aps-primary-600);
  font-size: var(--aps-text-xl);
}

/* Abstract text */
main > section:has(> h2) > p {
  font-size: var(--aps-text-base);
  line-height: 1.7;
  color: var(--aps-neutral-900);
}

/* Author list */
main > section > ul {
  list-style: none;
  padding: 0;
  margin: var(--spacing-md) 0;
}

main > section > ul > li {
  padding: var(--spacing-sm) 0;
  /* border-bottom: 1px solid var(--aps-neutral-200); */
  font-size: var(--aps-text-base);
  color: var(--aps-neutral-700);
}

/* main > section > ul > li:last-child {
  border-bottom: none;
} */

/* List items inside #events-heading section */
#events-heading + ul > li {
  padding: var(--spacing-sm) var(--spacing-md);
}

/* ============================================================================
   12. UTILITY & SPECIAL ELEMENTS
   ============================================================================ */

/* Subscript and superscript styling */
sub,
sup {
  font-size: 0.75em;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/* Code and pre blocks (if present) */
code,
pre {
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 0.9em;
}

code {
  background-color: var(--aps-neutral-100);
  padding: 0.125rem 0.25rem;
  border-radius: 0.125rem;
  color: var(--aps-primary-700);
}

pre {
  background-color: var(--aps-neutral-100);
  padding: var(--spacing-md);
  border-radius: 0.25rem;
  overflow-x: auto;
  border: 1px solid var(--aps-neutral-200);
}

pre code {
  background: none;
  padding: 0;
}

/* ============================================================================
   13. RESPONSIVE UTILITIES
   ============================================================================ */

/* Responsive images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================================================
   14. PRINT STYLES
   ============================================================================ */

@media print {
  body {
    background: white;
    color: black;
  }

  /* header {
    border-bottom: 2px solid black;
  } */

  nav {
    display: none;
  }

  a {
    text-decoration: underline;
    color: black;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

  main > section {
    page-break-inside: avoid;
    border: 1px solid black;
  }
}

/* ============================================================================
   15. ACCESSIBILITY ENHANCEMENTS
   ============================================================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--aps-primary-400);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
  :root {
    --aps-primary-600: #003a61;
    --aps-neutral-900: #000000;
  }

  main > section {
    border-width: 2px;
  }
}

/* ============================================================================
   END OF STYLESHEET
   ============================================================================ */