/* ==========================================================
   Black Python Devs — "Luminous Monolith"
   Complete standalone design system. No Pico dependency.
   Syne · DM Sans · Heroicons · Electric Cyan · Warm Gold
   ========================================================== */

/* ── 0. Keyframes ─────────────────────────────────────────── */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes seam-pulse {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 0.8;
  }
}

@keyframes float-subtle {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

/* ── 1. Reset ─────────────────────────────────────────────── */

html.theme-transition,
html.theme-transition *,
html.theme-transition *::before,
html.theme-transition *::after {
  transition:
    background-color 0.5s ease,
    color 0.5s ease,
    border-color 0.5s ease,
    box-shadow 0.5s ease !important;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family:
    "DM Sans",
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--bpd-text);
  background-color: var(--bpd-void);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  /* geometric textile texture */
  background-image: repeating-linear-gradient(135deg, transparent, transparent 52px, var(--bpd-body-texture) 52px, var(--bpd-body-texture) 53px);
  background-attachment: fixed;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

/* ── 2. Typography ────────────────────────────────────────── */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family:
    "DM Sans",
    system-ui,
    -apple-system,
    sans-serif;
  color: var(--bpd-white);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: 0;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
}
h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
}
h3 {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}
h2:first-child,
h3:first-child {
  margin-top: 0;
}
h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
}
h5 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.7rem;
}
h6 {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.7rem;
}

p {
  margin-top: 0;
  margin-bottom: 1.35rem;
  color: var(--bpd-text);
}

a {
  color: var(--bpd-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  transition: color 0.4s ease;
}
a:hover {
  color: var(--bpd-white);
}

/* No underline in nav, buttons, logos, footer nav */
nav a,
a[role="button"],
a.btn,
a.logo-text,
.footer-col a,
.social-links a {
  text-decoration: none;
}
a:focus-visible {
  outline: 2px solid var(--bpd-cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

strong,
b {
  color: var(--bpd-white);
  font-weight: 600;
}
small {
  color: var(--bpd-muted);
  font-size: 0.85rem;
}
em,
i {
  font-style: italic;
}
hr {
  border: none;
  border-top: 1px solid var(--bpd-border);
  margin: 2.5rem 0;
}

code,
pre,
kbd,
samp {
  font-family: "JetBrains Mono", "Fira Code", "SF Mono", "Cascadia Code", monospace;
  font-size: 0.9em;
}

code {
  background: var(--bpd-raised);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--bpd-cyan);
}

pre {
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: var(--bpd-text);
}

blockquote {
  border-left: 3px solid var(--bpd-gold);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  color: var(--bpd-muted);
  background: var(--bpd-gold-wash);
  border-radius: 0 8px 8px 0;
}

/* ── 3. Lists ─────────────────────────────────────────────── */

ul,
ol {
  margin: 0 0 1.35rem 0;
  padding-left: 1.5rem;
}
ul li {
  list-style: disc;
  margin-bottom: 0.7rem;
  line-height: 1.75;
}
ol li {
  list-style: decimal;
  margin-bottom: 0.7rem;
  line-height: 1.75;
}

/* Strip bullets in nav, footer, and other chrome */
nav ul,
.footer-col ul,
.social-links,
.menu,
ul.speaking-list {
  padding-left: 0;
}
nav li,
.footer-col li,
.social-links li,
.menu-item {
  list-style: none;
}

/* ── 4. Tables ────────────────────────────────────────────── */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}
th,
td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--bpd-border);
}
th {
  color: var(--bpd-white);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── 5. Forms ─────────────────────────────────────────────── */

button,
input,
optgroup,
select,
textarea {
  font: inherit;
  color: inherit;
  margin: 0;
}
button {
  overflow: visible;
  cursor: pointer;
}
button,
select {
  text-transform: none;
}
button[disabled],
input[disabled] {
  cursor: default;
  opacity: 0.45;
}
button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="search"],
input[type="number"],
input[type="tel"],
textarea,
select {
  display: block;
  width: 100%;
  padding: 0.7rem 1rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--bpd-white);
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border);
  border-radius: 8px;
  transition:
    border-color 0.4s ease,
    box-shadow 0.4s ease;
  outline: none;
}
input:focus,
textarea:focus,
select:focus {
  border-color: var(--bpd-cyan);
  box-shadow: 0 0 0 3px var(--bpd-cyan-wash);
}

input::placeholder,
textarea::placeholder {
  color: var(--bpd-faint);
}

input[type="submit"],
button[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--bpd-void);
  background: var(--bpd-cyan);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition:
    background 0.4s ease,
    transform 0.3s ease,
    box-shadow 0.4s ease;
}
input[type="submit"]:hover,
button[type="submit"]:hover {
  background: #33ecff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--bpd-cyan-glow);
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 1rem;
}

fieldset[role="group"] {
  display: flex;
  gap: 0;
}
fieldset[role="group"] input {
  border-radius: 8px 0 0 8px;
  flex: 1;
}
fieldset[role="group"] input[type="submit"] {
  border-radius: 0 8px 8px 0;
  white-space: nowrap;
}

label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--bpd-white);
  margin-bottom: 0.35rem;
}

/* ── 6. Details / Summary ─────────────────────────────────── */

details {
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border);
  border-radius: 10px;
  margin-bottom: 1.25rem;
  overflow: hidden;
}
details > summary {
  padding: 1.1rem 1.35rem;
  font-weight: 600;
  color: var(--bpd-white);
  cursor: pointer;
  transition: background 0.4s ease;
  list-style: none;
}
details > summary::-webkit-details-marker {
  display: none;
}
details > summary::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid var(--bpd-muted);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  margin-right: 0.75rem;
  transition: transform 0.4s ease;
}
details > summary::before {
  transition: transform 0.45s ease;
}
details[open] > summary::before {
  transform: rotate(90deg);
}
details > summary:hover {
  background: var(--bpd-cyan-wash);
}
details[open] > summary {
  border-bottom: 1px solid var(--bpd-border);
}
details > *:not(summary) {
  padding: 1.25rem 1.35rem;
  animation: details-open 0.5s ease;
}
@keyframes details-open {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
/* Override for nav dropdowns */
.menu-item details.dropdown {
  background: transparent;
  border: none;
  margin: 0;
  overflow: visible;
}
.menu-item details.dropdown > summary::before {
  display: none;
}
.menu-item details.dropdown > *:not(summary) {
  padding: 0;
}
.menu-item details.dropdown[open] > summary {
  border-bottom: none;
}

/* ── 7. Accessibility ─────────────────────────────────────── */

.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  width: 1px;
  overflow: hidden;
  padding: 0;
  position: absolute !important;
  white-space: nowrap;
}

.skip-to-content {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.6rem 1.4rem;
  background: var(--bpd-cyan);
  color: var(--bpd-void);
  font-weight: 700;
  border-radius: 0 0 8px 8px;
  transition: top 0.25s ease;
}
.skip-to-content:focus {
  top: 0;
  color: var(--bpd-void);
}

/* ── 8. Layout: Container ─────────────────────────────────── */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
  animation: fadeInUp 0.5s ease both;
}

main.container {
  min-height: 50vh;
}

@media (max-width: 600px) {
  .container {
    padding: 2rem 1rem 3rem;
  }
}

/* ── 9. Layout: Grid (replaces Pico .grid) ────────────────── */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  align-items: start;
  padding-left: 0;
}

.grid li {
  list-style: none;
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
  .grid img {
    max-width: 70%;
  }
}

/* ── 10. Site Header ──────────────────────────────────────── */

.site-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0 2rem;
  height: 64px;
  background: var(--bpd-header-bg);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  border-bottom: 1px solid var(--bpd-border);
  position: sticky;
  top: 0;
  z-index: 500;
}

/* luminous seam */
.site-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--bpd-gold-wash) 30%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 70%, transparent 95%);
  opacity: 0.5;
  animation: seam-pulse 6s ease-in-out infinite;
}

.site-title {
  margin: 0;
  padding: 0;
  font-size: 0;
  line-height: 0;
  flex-shrink: 0;
}
a.logo-text {
  display: inline-flex;
  align-items: center;
  height: 64px;
}
a.logo-text img {
  width: 12rem;
  height: auto;
  transition: opacity 0.4s ease;
}
a.logo-text:hover img {
  opacity: 0.78;
}

/* Iconoir icons inside nav links */
.menu-item i[class^="iconoir-"],
.menu-item i[class*=" iconoir-"] {
  font-size: 1.1em;
  vertical-align: -0.1em;
  line-height: 1;
}

@media (max-width: 600px) {
  .site-header {
    padding: 0 1.25rem;
    height: 56px;
  }
  a.logo-text {
    height: 56px;
  }
  a.logo-text img {
    width: 9.5rem;
  }
}

/* ── 11. Navigation ───────────────────────────────────────── */

.site-navigation {
  margin-left: auto;
  display: flex;
  align-items: center;
  height: 100%;
}

.site-navigation-wrap {
  display: flex;
  align-items: center;
  height: 100%;
}

.menu {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
}

.menu-item {
  display: inline-block;
  margin: 0;
}

.menu-item a {
  color: var(--bpd-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 0.45rem 0.8rem;
  text-decoration: none;
  border-radius: 6px;
  position: relative;
  transition:
    color 0.4s ease,
    background 0.4s ease;
}
.menu-item a:hover,
.menu-item.nav-current a:link,
.menu-item.nav-current a:visited {
  color: var(--bpd-cyan);
  background: var(--bpd-cyan-wash);
}

/* growing underline */
.menu-item a::after {
  content: "";
  position: absolute;
  bottom: 1px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--bpd-gold);
  border-radius: 1px;
  transition:
    width 0.45s ease,
    left 0.45s ease;
}
.menu-item a:hover::after,
.menu-item.nav-current a::after {
  width: 50%;
  left: 25%;
}

/* Heroicons in nav — size them */
.menu-item .icon,
.menu-item svg.icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* hidden on desktop — only shown in mobile media query */
#menu-close,
#menu-open {
  display: none;
}

/* toggle button base styles (applied when visible) */
#menu-close,
#menu-open,
.back-to-top {
  background: transparent;
  border: 1px solid var(--bpd-border-hi);
  border-radius: 8px;
  color: var(--bpd-muted);
  padding: 0;
  position: relative;
  height: 40px;
  width: 40px;
  align-items: center;
  justify-content: center;
  transition:
    border-color 0.4s ease,
    color 0.4s ease,
    background 0.4s ease;
}
.back-to-top {
  display: flex;
}
#menu-close:hover,
#menu-close:focus,
#menu-open:hover,
#menu-open:focus,
.back-to-top:hover,
.back-to-top:focus {
  border-color: var(--bpd-cyan);
  color: var(--bpd-cyan);
  background: var(--bpd-cyan-wash);
  outline: 0;
}

/* hamburger */
.icon-menu {
  background: currentColor;
  color: inherit;
  height: 2px;
  width: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -1px 0 0 -10px;
  border-radius: 2px;
}
.icon-menu::before,
.icon-menu::after {
  content: "";
  background: currentColor;
  height: 100%;
  width: 100%;
  position: absolute;
  left: 0;
  border-radius: 2px;
}
.icon-menu::before {
  top: -6px;
}
.icon-menu::after {
  bottom: -6px;
}

/* close */
.icon-close {
  background: 0;
  color: inherit;
  height: 2px;
  width: 22px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -1px 0 0 -11px;
}
.icon-close::before,
.icon-close::after {
  content: "";
  background: currentColor;
  height: 100%;
  width: 100%;
  position: absolute;
  left: 0;
  border-radius: 2px;
}
.icon-close::before {
  top: 0;
  transform: rotate(45deg);
}
.icon-close::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ── Mobile Nav ── */
@media (max-width: 800px) {
  #menu-open {
    display: flex;
    flex: 0 0 auto;
    margin-left: auto;
  }
  #menu-close {
    display: flex;
    position: absolute;
    right: 2rem;
    top: 1.5rem;
  }
  .site-navigation {
    background: var(--bpd-void);
    position: fixed;
    inset: 0;
    margin: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    visibility: hidden;
    z-index: -1;
    height: 100vh;
    transition:
      opacity 0.35s ease,
      visibility 0.35s ease;
  }
  .site-navigation-wrap {
    height: 100%;
    width: 100%;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .site-navigation-wrap ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    height: auto;
  }
  .site-navigation-wrap ul li {
    width: auto;
    text-align: center;
  }
  .menu {
    opacity: 0;
    padding: 4rem 2rem;
    flex-direction: column;
    gap: 0.5rem;
    height: auto;
    transition: opacity 0.3s ease 0.1s;
  }
  .menu-item {
    display: block;
    margin: 0;
  }
  .menu-item a,
  .menu-item div {
    display: block;
    padding: 0.8rem 2.5rem;
    font-size: 1.2rem;
    text-align: center;
  }
  .menu-item a::after {
    display: none;
  }
  .menu--opened .site {
    height: 100%;
    left: 0;
    overflow: hidden;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 998;
  }
  .menu--opened .site-navigation {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
    z-index: 999;
  }
  .menu--opened .menu {
    opacity: 1;
  }
}

@media (max-width: 1080px) and (min-width: 801px) {
  .menu-item a {
    font-size: 0.8rem;
    padding: 0.4rem 0.55rem;
  }
}

/* ── 12. Nav Dropdowns ────────────────────────────────────── */

.menu-item details.dropdown {
  position: relative;
  display: inline-block;
  padding: 0;
  margin: 0;
  border: none;
  background: transparent !important;
  box-shadow: none !important;
  width: auto;
}
.menu-item details.dropdown summary {
  cursor: pointer;
  list-style: none;
  margin-bottom: 0;
  padding: 0.45rem 0.8rem;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  color: var(--bpd-muted);
  font-weight: 500;
  font-size: 0.875rem;
  font-family: inherit;
  outline: none;
  border-radius: 6px;
  transition:
    color 0.4s ease,
    background 0.4s ease;
}
.menu-item details.dropdown summary:hover,
.menu-item details.dropdown[open] summary {
  color: var(--bpd-cyan);
  background: var(--bpd-cyan-wash) !important;
}
.menu-item details.dropdown summary::-webkit-details-marker {
  display: none;
}
.menu-item details.dropdown summary::after {
  display: none;
}

.menu-item details.dropdown ul.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  left: auto;
  min-width: 220px;
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border-hi);
  padding: 0.4rem 0;
  margin: 0;
  z-index: 1000;
  display: flex !important;
  flex-direction: column !important;
  box-shadow:
    0 16px 48px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(0, 229, 255, 0.05);
  border-radius: 10px;
  list-style: none;
}
.menu-item details.dropdown ul.dropdown-menu li.dropdown-item {
  display: block !important;
  margin: 0;
  width: 100%;
  border: none;
  padding: 0;
}
.menu-item details.dropdown ul.dropdown-menu li.dropdown-item a {
  display: block;
  padding: 0.6rem 1.15rem;
  width: 100%;
  color: var(--bpd-muted);
  font-size: 0.875rem;
  font-weight: 400;
  border-radius: 0;
  transition:
    color 0.35s ease,
    background 0.35s ease;
}
.menu-item details.dropdown ul.dropdown-menu li.dropdown-item a::after {
  display: none;
}
.menu-item details.dropdown ul.dropdown-menu li.dropdown-item a:hover {
  background: var(--bpd-cyan-wash);
  color: var(--bpd-cyan);
}

/* ── 12b. Toast Banner ───────────────────────────────────── */

.toast {
  position: relative;
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border);
  border-radius: 12px;
  margin-bottom: 2rem;
  overflow: hidden;
  transition:
    border-color 0.5s ease,
    box-shadow 0.5s ease,
    transform 0.5s ease;
}

/* luminous gold seam — echoes site header + newsletter card */
.toast::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--bpd-gold-wash) 25%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 75%, transparent);
  border-radius: 12px 12px 0 0;
}

.toast:hover {
  border-color: var(--bpd-border-hi);
  box-shadow: 0 0 28px var(--bpd-cyan-glow);
  transform: translateY(-2px);
}

.toast a {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  padding: 1.1rem 1.5rem;
  color: var(--bpd-cyan);
  text-decoration: none;
  font-weight: 600;
  text-align: center;
}

.toast a:hover {
  color: var(--bpd-white);
}

.toast-icon {
  color: var(--bpd-gold);
  font-size: 1.15rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.toast:hover .toast-icon {
  transform: translateX(4px);
}

@media (max-width: 600px) {
  .toast a {
    padding: 0.95rem 1.1rem;
    font-size: 0.92rem;
  }
}

/* ── 13. Hero ─────────────────────────────────────────────── */

.hero {
  width: 100%;
  background-image: url("../images/hero-bpd-background.c3830b078aa5.jpg");
  background-size: cover;
  background-position: center;
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 3.5rem;
  border: 1px solid var(--bpd-border);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 15% 85%, var(--bpd-cyan-wash) 0%, transparent 55%), radial-gradient(ellipse at 85% 15%, var(--bpd-gold-wash) 0%, transparent 50%),
    linear-gradient(155deg, var(--bpd-hero-overlay-start) 0%, var(--bpd-hero-overlay-mid) 50%, var(--bpd-hero-overlay-end) 100%);
  z-index: 1;
}

.hero > div {
  position: relative;
  z-index: 2;
  margin: auto;
  padding: 4.5rem 3rem;
}

@media (max-width: 700px) {
  .hero > div {
    padding: 2.5rem 1.5rem;
  }
  .hero {
    border-radius: 12px;
  }
}

.hero-text {
  font-family: "Syne", "DM Sans", system-ui, sans-serif;
  font-size: clamp(1.3rem, 3vw, 2.2rem);
  font-weight: 700;
  font-style: normal;
  line-height: 1.2;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bpd-white);
}

/* ── 14. Cards / Articles ─────────────────────────────────── */

/* Base article — no box, just flow content */
article {
  margin-bottom: 2rem;
}

/* Card treatment — only for focused targets */
.card,
article.post-list,
article:has(form[action*="buttondown"]),
.leadership-photo-container {
  background: var(--bpd-raised);
  border: 1px solid var(--bpd-border);
  border-radius: 12px;
  padding: 2rem;
  transition:
    border-color 0.5s ease,
    box-shadow 0.5s ease,
    transform 0.5s ease;
}
.card:hover,
article.post-list:hover,
article:has(form[action*="buttondown"]):hover,
.leadership-photo-container:hover {
  border-color: var(--bpd-border-hi);
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.05);
  transform: translateY(-2px);
}

/* don't double-margin cards in grids or nested */
.hero,
article article,
.grid article {
  margin-bottom: 0;
}

.principles {
  text-align: center;
  padding: 3rem 0;
}
.principles h2 {
  margin-top: 0;
  margin-bottom: 2.5rem;
}
.principles .grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  gap: 4rem 1.5rem;
}
.principles .grid > article {
  flex: 0 1 260px;
  max-width: 300px;
}

.hero-section article {
  display: flex;
  flex-direction: column;
  text-align: center;
}
.hero-section article > header {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

article.post-list a {
  color: var(--bpd-cyan);
}
article.post-list a:hover {
  color: var(--bpd-white);
}

article.pico-background-pumpkin-650 a.contrast,
article.pico-background-pumpkin-800 a.contrast,
article.pico-background-zinc-800 a.contrast {
  color: var(--bpd-cyan);
}

/* ── 15. Buttons ──────────────────────────────────────────── */

a[role="button"],
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.7rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  background: var(--bpd-cyan);
  border: none;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.4s ease,
    box-shadow 0.45s ease,
    background 0.4s ease;
}
a[role="button"]:hover,
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  color: #fff;
}
a[role="button"]:active,
.btn:active {
  transform: translateY(0);
}

/* color variants */
a[role="button"].primary,
.btn.primary {
  color: #fff;
  background: var(--bpd-cyan);
  border: 2px solid transparent;
}
a[role="button"].primary:hover,
.btn.primary:hover {
  background: var(--bpd-cyan-dim);
}

a[role="button"].secondary,
.btn.secondary {
  color: var(--bpd-void);
  background: var(--bpd-gold);
  border: 2px solid transparent;
}
a[role="button"].secondary:hover,
.btn.secondary:hover {
  color: var(--bpd-void);
  background: var(--bpd-gold-dim);
}

a[role="button"].contrast,
.btn.contrast {
  color: var(--bpd-void);
  background: var(--bpd-white);
  border: 2px solid transparent;
}
a[role="button"].contrast:hover,
.btn.contrast:hover {
  color: var(--bpd-void);
  background: var(--bpd-text);
}

a[role="button"].outline,
.btn.outline {
  color: var(--bpd-cyan);
  background: transparent;
  border: 2px solid var(--bpd-cyan);
}
a[role="button"].outline:hover,
.btn.outline:hover {
  color: #fff;
  background: var(--bpd-cyan);
}
a[role="button"].outline.secondary,
.btn.outline.secondary {
  color: var(--bpd-gold);
  background: transparent;
  border-color: var(--bpd-gold);
}
a[role="button"].outline.secondary:hover,
.btn.outline.secondary:hover {
  color: var(--bpd-void);
  background: var(--bpd-gold);
}
a[role="button"].outline.contrast,
.btn.outline.contrast {
  color: var(--bpd-white);
  background: transparent;
  border-color: var(--bpd-white);
}
a[role="button"].outline.contrast:hover,
.btn.outline.contrast:hover {
  color: var(--bpd-void);
  background: var(--bpd-white);
}

a[role="button"][disabled] {
  opacity: 0.5;
  pointer-events: none;
}

a.white-button {
  color: #fff !important;
}

/* ── 16. Newsletter ───────────────────────────────────────── */

div#newsletter,
article:has(form[action*="buttondown"]) {
  position: relative;
  overflow: hidden;
}
div#newsletter::before,
article:has(form[action*="buttondown"])::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--bpd-gold), var(--bpd-cyan), var(--bpd-gold));
  border-radius: 12px 12px 0 0;
}

/* ── 17. Leadership photos ────────────────────────────────── */

img.leadership-photo {
  border-radius: 50%;
  width: 5.5rem;
  height: 5.5rem;
  object-fit: cover;
  border: 2px solid var(--bpd-border-hi);
  transition:
    border-color 0.45s ease,
    box-shadow 0.45s ease,
    transform 0.5s ease;
}
img.leadership-photo:hover {
  border-color: var(--bpd-gold);
  box-shadow: 0 0 24px var(--bpd-gold-wash);
  transform: scale(1.06);
}

.leadership-card {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.leadership-card img.leadership-photo {
  flex-shrink: 0;
  width: 4rem;
  height: 4rem;
}

/* Update annotation — a dated callout for changes to event details. */
.update-note {
  border-left: 4px solid var(--bpd-gold);
  background: var(--bpd-gold-wash);
  border-radius: 0 10px 10px 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.update-note > :first-child {
  margin-top: 0;
}
.update-note > :last-child {
  margin-bottom: 0;
}
.update-note .update-note-label {
  display: block;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin-bottom: 0.35rem;
}

/* ── 18. Images ───────────────────────────────────────────── */

/* Speaker cards — force a uniform portrait crop regardless of the
   source image's aspect ratio so every photo lines up in the grid. */
img.speaker-photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 10px;
}
img.donation-photo {
  max-width: 20rem;
  border-radius: 10px;
}
img.featured-image {
  max-height: 20rem;
  border-radius: 12px;
  object-fit: cover;
}
ul.speaking-list {
  padding-left: 2rem;
}

.page-content {
  padding: 0;
  flex: 1 0 auto;
}
main.page-content div.wrapper p img {
  width: 95%;
  border-radius: 10px;
}

/* ── 18b. Schedule ────────────────────────────────────────── */

/* Running order table. The time column is the row header: kept on one line
   and in tabular figures so the times line up down the column. */
.schedule th[scope="row"] {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  white-space: nowrap;
  color: var(--bpd-muted);
}

/* ── 19. Video ────────────────────────────────────────────── */

.video-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  border-radius: 12px;
  overflow: hidden;
}
.video-embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ── 20. Sponsors ─────────────────────────────────────────── */

.sponsor {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  /* Fixed light background in both themes so full-color sponsor
     logos stay legible in dark mode (issue #933, option C) */
  background: #ffffff;
  border: 1px solid var(--bpd-border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
}
.post-title > h3 {
  font-size: smaller;
}

/* ── 21. Footer ───────────────────────────────────────────── */

footer {
  background: var(--bpd-base);
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 5rem;
  padding: 4.5rem 0 3rem;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--bpd-gold-wash) 25%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 75%, transparent);
}

.wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 1fr;
  gap: 4rem;
}

.footer-col h3 {
  font-family: "Syne", "DM Sans", system-ui, sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bpd-white);
  margin-bottom: 1.1rem;
  padding-bottom: 0.65rem;
  position: relative;
}
.footer-col h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--bpd-gold);
  border-radius: 1px;
}

.footer-col p {
  color: var(--bpd-text);
  font-size: 0.9rem;
  line-height: 1.7;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col ul li {
  margin-bottom: 0.6rem;
}
.footer-col ul li a {
  color: var(--bpd-text);
  font-size: 0.9rem;
  display: inline-block;
  transition:
    color 0.2s ease,
    transform 0.2s ease;
}
.footer-col ul li a:hover {
  color: var(--bpd-gold);
  transform: translateX(3px);
}
.footer-col address {
  font-style: normal;
}
.footer-col address p {
  margin: 0 0 0.35rem;
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--bpd-faint);
  border-top: 1px solid var(--bpd-border);
}

/* ── 22. Social icons ─────────────────────────────────────── */

.social-links {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.social-links li {
  margin: 0;
}
.social-links li a {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem;
  border: none;
  border-radius: 6px;
  color: var(--bpd-muted);
  font-size: 1.4rem;
  transition:
    color 0.4s ease,
    background 0.4s ease;
}
.social-links li a:hover {
  color: var(--bpd-gold);
  background: var(--bpd-gold-wash);
}

/* ── 23. Pagination ───────────────────────────────────────── */

section > div[role="group"] {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 2.5rem 0;
}

.pagination {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
  margin: 2.5rem 0;
}
.pagination a {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--bpd-border-hi);
  border-radius: 6px;
  color: var(--bpd-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.4s ease;
}
.pagination a:hover {
  background: var(--bpd-cyan);
  color: var(--bpd-void);
  border-color: var(--bpd-cyan);
}
.pagination .current {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--bpd-cyan);
  background: var(--bpd-cyan);
  color: var(--bpd-void);
  border-radius: 6px;
  font-weight: 700;
}

/* ── 24. Sections ─────────────────────────────────────────── */

section {
  margin-bottom: 5rem;
}

/* ── 25. Responsive ───────────────────────────────────────── */

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  footer {
    padding-top: 3rem;
    margin-top: 3rem;
  }
}

/* ── 26. Print ────────────────────────────────────────────── */

@media print {
  .site-header,
  footer,
  .menu-toggle {
    display: none;
  }
  body {
    color: #000;
    background: #fff;
    background-image: none;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
  article {
    border: 1px solid #ccc;
    box-shadow: none;
    background: #fff;
  }
  .hero-text {
    color: #000;
  }
}

/* ── 27. Theme toggle button ──────────────────────────────── */

.theme-toggle {
  background: none;
  border: 1px solid var(--bpd-border-hi);
  border-radius: 8px;
  color: var(--bpd-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  margin-left: 0;
  font-size: 1.15rem;
  transition:
    color 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
  flex-shrink: 0;
}
.theme-toggle:hover {
  color: var(--bpd-cyan);
  border-color: var(--bpd-cyan);
  background: var(--bpd-cyan-wash);
}

/* ── 28. Light mode overrides ────────────────────────────── */

/* Shared light-mode rules for both OS preference and manual toggle */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) a.logo-text img {
    filter: brightness(0) saturate(100%);
  }
  :root:not([data-theme="dark"]) .site-header::after {
    background: linear-gradient(90deg, transparent 0%, var(--bpd-gold-wash) 30%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 70%, transparent 100%);
  }
  :root:not([data-theme="dark"]) footer::before {
    background: linear-gradient(90deg, transparent 0%, var(--bpd-gold-wash) 30%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 70%, transparent 100%);
  }
  :root:not([data-theme="dark"]) .site-header {
    -webkit-backdrop-filter: blur(14px) saturate(1.4);
    backdrop-filter: blur(14px) saturate(1.4);
  }
  :root:not([data-theme="dark"]) .card:hover,
  :root:not([data-theme="dark"]) article.post-list:hover,
  :root:not([data-theme="dark"]) article:has(form[action*="buttondown"]):hover,
  :root:not([data-theme="dark"]) .leadership-photo-container:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  }
}

/* Manual light toggle — works regardless of OS preference */
[data-theme="light"] a.logo-text img {
  filter: brightness(0) saturate(100%);
}
[data-theme="light"] .site-header::after {
  background: linear-gradient(90deg, transparent 0%, var(--bpd-gold-wash) 30%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 70%, transparent 100%);
}
[data-theme="light"] footer::before {
  background: linear-gradient(90deg, transparent 0%, var(--bpd-gold-wash) 30%, var(--bpd-gold) 50%, var(--bpd-gold-wash) 70%, transparent 100%);
}
[data-theme="light"] .site-header {
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
}
[data-theme="light"] .card:hover,
[data-theme="light"] article.post-list:hover,
[data-theme="light"] article:has(form[action*="buttondown"]):hover,
[data-theme="light"] .leadership-photo-container:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}