/* Design Plan:
 * Subject: Minimal event registration desk & checklist portal
 * Idea sentence: On this site, the strict operational protocol of an attendee check-in desk becomes an austere, high-contrast, structured checklist interface.
 * Why it fits: The user requested a minimal accessible event registration page with Auth, Database checks list, and Files upload control.
 * Bold element: Monolithic high-contrast status header and structured interactive checklist panels with immediate accessible status banners.
 */

:root {
  --color-ground: #f7f9fa;
  --color-surface: #ffffff;
  --color-ink: #111827;
  --color-muted: #4b5563;
  --color-accent: #0f4c81;
  --color-accent-hover: #0a3357;
  --color-border: #d1d5db;
  --color-success: #065f46;
  --color-success-bg: #ecfdf5;
  --color-error: #991b1b;
  --color-error-bg: #fef2f2;
  --color-subtle: #f3f4f6;

  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.75rem;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  --radius: 0px;
}

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-ground);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background-color: var(--color-accent);
  color: #ffffff;
}

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

.skip-link {
  position: absolute;
  top: -9999px;
  left: var(--space-4);
  background: var(--color-ink);
  color: #ffffff;
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-4);
}

.page-container {
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4) var(--space-12);
}

header.site-header {
  border-bottom: 2px solid var(--color-ink);
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-8);
}

h1 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 var(--space-2);
  text-wrap: balance;
}

.header-lead {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-base);
  text-wrap: pretty;
}

.session-badge {
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-3);
  background: var(--color-subtle);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}

.form-group {
  margin-bottom: var(--space-4);
}

label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.help-text {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: var(--space-1);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"] {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-base);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-ink);
  min-height: 44px;
}

input[type="file"] {
  padding: var(--space-2);
  background: var(--color-subtle);
}

.btn-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  background-color: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
}

button:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button.btn-secondary {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-border);
}

button.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-subtle);
}

.status-box {
  margin-top: var(--space-3);
  padding: var(--space-3);
  font-size: var(--text-sm);
  min-height: 24px;
}

.status-box:empty {
  display: none;
}

.status-box.success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.status-box.error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.checks-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
  border-top: 1px solid var(--color-border);
}

.checks-list li {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

.empty-state {
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-4);
}

footer {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: var(--text-xs);
  text-align: center;
}