:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-synthesis: none;
  line-height: 1.5;
  --page-background: #f5f5f7;
  --surface: #ffffff;
  --surface-muted: #f5f5f7;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --border: #d2d2d7;
  --accent: #0066cc;
  --accent-hover: #004f9e;
  --accent-contrast: #ffffff;
  --danger: #b42318;
  --danger-background: #fff4f2;
  --notice: #0057b8;
  --notice-background: #eef6ff;
  --shadow: 0 0.5rem 1.5rem rgb(0 0 0 / 8%);
  --radius: 0.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-background: #000000;
    --surface: #1c1c1e;
    --surface-muted: #2c2c2e;
    --text: #f5f5f7;
    --text-muted: #aeaeb2;
    --border: #48484a;
    --accent: #2997ff;
    --accent-hover: #64b5ff;
    --accent-contrast: #000000;
    --danger: #ff6961;
    --danger-background: #3a1718;
    --notice: #64b5ff;
    --notice-background: #0c2d4d;
    --shadow: 0 0.5rem 1.5rem rgb(0 0 0 / 30%);
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page-background);
  color: var(--text);
}

body {
  margin: 0;
  min-width: 20rem;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
input,
select,
textarea {
  accent-color: var(--accent);
}

button,
input,
select,
textarea,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--accent-hover);
}

:focus-visible {
  outline: 0.2rem solid var(--accent);
  outline-offset: 0.2rem;
}

.skip-link {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  box-shadow: var(--shadow);
  color: var(--text);
  left: 1rem;
  padding: 0.65rem 0.9rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: 10;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-block-end: 1px solid var(--border);
}

.site-header__inner,
.page,
.site-footer__inner {
  margin-inline: auto;
  max-width: 48rem;
  padding-inline: 1.25rem;
}

.site-header__inner {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  min-height: 4.5rem;
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand:hover {
  color: var(--text);
}

.site-nav {
  align-items: center;
  display: flex;
  font-size: 0.94rem;
  gap: 1rem;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--accent);
}

.page {
  min-height: calc(100vh - 8.5rem);
  padding-block: clamp(2rem, 6vw, 4.5rem);
}

.site-footer {
  border-block-start: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  justify-content: space-between;
  padding-block: 1.5rem;
}

h1,
h2,
h3 {
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  margin-block: 2rem 0.75rem;
}

h3 {
  font-size: 1.1rem;
  margin-block: 1.5rem 0.5rem;
}

p,
ul,
ol {
  margin-block: 0 1rem;
}

.markdown-content {
  color: var(--text);
}

.markdown-content > :first-child {
  margin-block-start: 0;
}

.markdown-content img {
  height: auto;
  max-width: 100%;
}

.event header {
  border-block-end: 1px solid var(--border);
  margin-block-end: 1.75rem;
  padding-block-end: 1.5rem;
}

.event header > p {
  color: var(--text-muted);
  margin-block-end: 0.35rem;
}

.event-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-block: 2rem;
}

.button,
button {
  align-items: center;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent-contrast);
  cursor: pointer;
  display: inline-flex;
  font-weight: 650;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.65rem 1.1rem;
  text-align: center;
  text-decoration: none;
}

.button:hover,
button:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--accent-contrast);
}

.button--secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.button--secondary:hover {
  background: var(--surface-muted);
  border-color: var(--border);
  color: var(--text);
}

.event-list {
  display: grid;
  gap: 0.85rem;
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
}

.event-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 0.1rem 0.25rem rgb(0 0 0 / 3%);
  padding: 1.1rem 1.2rem;
}

.event-list a {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 650;
}

.event-list span {
  color: var(--text-muted);
  display: block;
  font-size: 0.9rem;
  margin-block-start: 0.3rem;
}

form {
  margin-block-start: 1.75rem;
}

fieldset {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 0 0 1rem;
  padding: clamp(1rem, 4vw, 1.5rem);
}

legend {
  font-size: 1.1rem;
  font-weight: 650;
  padding-inline: 0.35rem;
}

fieldset > div {
  border-block-end: 1px solid var(--border);
  margin-block: 1.25rem;
  padding-block-end: 1.25rem;
}

fieldset > div:last-child {
  border-block-end: 0;
  margin-block-end: 0;
  padding-block-end: 0;
}

form p {
  margin-block-end: 1.1rem;
}

form label {
  color: var(--text);
  font-weight: 600;
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  color: var(--text);
  margin-block-start: 0.4rem;
  max-width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.75rem;
  width: 100%;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

input[type="checkbox"],
input[type="radio"] {
  block-size: 1.1rem;
  inline-size: 1.1rem;
  margin-inline-end: 0.35rem;
  vertical-align: -0.1em;
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

.form-error {
  color: var(--danger);
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 650;
  margin-block-start: 0.4rem;
}

.participant-list,
.notice,
.error,
.edit-link {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-block: 1.75rem;
  padding: clamp(1rem, 4vw, 1.5rem);
}

.participant-list > :last-child,
.notice > :last-child,
.error > :last-child,
.edit-link > :last-child {
  margin-block-end: 0;
}

.participant-list ol {
  display: grid;
  gap: 0.85rem;
  list-style-position: inside;
  margin-block-end: 0;
  padding: 0;
}

.participant-list ol > li {
  border-block-start: 1px solid var(--border);
  padding-block: 1rem 0;
}

.participant-list ol > li:first-child {
  border-block-start: 0;
}

.participant-list li p {
  margin-block-end: 0.4rem;
}

.participant-list section {
  background: var(--surface-muted);
  border-radius: 0.5rem;
  margin-block: 0.8rem;
  padding: 0.85rem;
}

.notice {
  background: var(--notice-background);
  border-color: var(--notice);
}

.error {
  background: var(--danger-background);
  border-color: var(--danger);
}

.error__status {
  color: var(--danger);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.edit-link {
  overflow-wrap: anywhere;
}

.edit-link__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.edit-link__actions svg {
  fill: none;
  height: 1.15rem;
  margin-inline-end: 0.45rem;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  width: 1.15rem;
}

.copy-status {
  color: var(--text-muted);
  font-size: 0.9rem;
  min-height: 1.35rem;
}

@media (max-width: 40rem) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.4rem;
    justify-content: center;
    padding-block: 0.85rem;
  }

  .site-nav {
    gap: 1.25rem;
  }

  .page {
    padding-inline: 1rem;
  }

  .event-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .event-actions .button {
    width: 100%;
  }

  .edit-link__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .edit-link__actions .button {
    width: 100%;
  }
}

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