:root {
  --bg: #fafaf9;
  --surface: #ffffff;
  --text: #1c1c1c;
  --muted: #6b6b6b;
  --border: #d9d9d6;
  --accent: #1c1c1c;
  --accent-text: #ffffff;
  --warn-bg: #fdf6e3;
  --warn-border: #e8d9a8;
  --error: #b42318;
  --radius: 6px;
  color-scheme: light;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

main {
  max-width: 540px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

[hidden] {
  display: none !important;
}

/* Typography */

h1 {
  margin: 0 0 24px;
  font-size: 1.75rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

h1 a {
  color: inherit;
  text-decoration: none;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.2rem;
  font-weight: 600;
}

p {
  margin: 0 0 16px;
}

.lede {
  color: var(--muted);
  margin-bottom: 24px;
}

.muted,
.hint {
  color: var(--muted);
}

.hint {
  font-size: 0.875rem;
  margin: 0;
}

a {
  color: var(--text);
  text-underline-offset: 3px;
}

label,
legend {
  display: block;
  font-weight: 550;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

/* Form controls */

input[type="text"],
textarea {
  width: 100%;
  min-width: 0;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  word-break: break-all;
}

input[readonly],
textarea[readonly] {
  background: var(--bg);
}

#link-output {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

input::placeholder {
  color: var(--muted);
}

input[aria-invalid="true"] {
  border-color: var(--error);
}

button {
  font: inherit;
  font-weight: 550;
  padding: 10px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  cursor: pointer;
  white-space: nowrap;
}

button.primary {
  background: var(--accent);
  color: var(--accent-text);
}

button.primary:hover {
  background: #333;
}

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

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

button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

button.wide {
  width: 100%;
}

:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

fieldset {
  border: 0;
  margin: 0 0 16px;
  padding: 0;
}

/* Layout helpers */

.row {
  display: flex;
  gap: 8px;
}

.row input {
  flex: 1;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 20px;
}

.actions:last-child {
  margin-bottom: 0;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}

.switch {
  text-align: center;
  margin-top: 32px;
  font-size: 0.9rem;
}

/* Load panel */

details.panel {
  padding: 0;
}

details summary {
  cursor: pointer;
  padding: 12px 20px;
  font-weight: 550;
  font-size: 0.95rem;
  list-style-position: inside;
}

details[open] summary {
  border-bottom: 1px solid var(--border);
}

#load-form {
  padding: 16px 20px 20px;
}

#load-form .row {
  margin-bottom: 8px;
}

/* Name list */

.name-list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
}

.name-list li {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.name-list input {
  flex: 1;
}

.remove-name {
  width: 44px;
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
  font-weight: 400;
  color: var(--muted);
}

.remove-name:hover:not(:disabled) {
  color: var(--text);
}

.add-name span {
  margin-right: 4px;
}

/* Per-person option */

.option {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

label.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-weight: 400;
  font-size: 1rem;
  cursor: pointer;
}

label.checkbox input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--accent);
}

.help-toggle {
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
}

.help-toggle:hover,
.help-toggle[aria-expanded="true"] {
  border-color: var(--text);
  color: var(--text);
}

.help {
  font-size: 0.9rem;
  color: var(--muted);
  border-left: 2px solid var(--border);
  padding-left: 12px;
  margin: 0 0 16px;
}

/* Personal links */

.personal-links {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
}

.personal-links li {
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.personal-links li:last-child {
  border-bottom: 1px solid var(--border);
}

.personal-links .person-name {
  font-weight: 600;
  margin-bottom: 6px;
  overflow-wrap: anywhere;
}

.personal-links input {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

#organizer-hint {
  margin-bottom: 8px;
}

#personal-reveal {
  margin-bottom: 24px;
}

.personal-hint {
  margin-top: 12px;
}

/* Messages */

.error {
  color: var(--error);
  font-size: 0.9rem;
  margin: 8px 0 16px;
}

.warning {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 0.9rem;
}

/* Output & result */

.output {
  margin-top: 32px;
}

.result {
  text-align: center;
  padding: 28px 20px;
}

.result p:first-child {
  margin-bottom: 4px;
}

.result-name {
  font-size: 2rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  overflow-wrap: anywhere;
}

#reveal-form {
  margin-bottom: 24px;
}

#manual-code {
  margin-bottom: 16px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}