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

:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --text: #e7ecf3;
  --muted: #8b9aab;
  --accent: #6cb3ff;
  --accent-hover: #9dccff;
  --border: #2d3a4d;
  --error: #ff8a8a;
  --radius: 12px;
  --tap: 44px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem;
}

.brand {
  font-weight: 600;
  font-size: 1.1rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

.site-nav .nav-logout {
  margin-left: auto;
}

.nav-logout {
  margin: 0;
}

.nav-logout-btn {
  background: none;
  border: none;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  padding: 0.25rem 0;
  text-decoration: underline;
  min-height: auto;
}

.nav-logout-btn:hover {
  color: var(--accent-hover);
}

.person-card-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.person-card-row .card-link {
  flex: 1;
  min-width: 0;
}

.person-meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.btn-danger {
  min-height: var(--tap);
  padding: 0.45rem 0.75rem;
  border: none;
  border-radius: 8px;
  background: rgba(255, 138, 138, 0.15);
  color: var(--error);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

.btn-danger:hover {
  filter: brightness(1.12);
}

.btn-block {
  width: 100%;
}

.session-member-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.session-member-row .card-title {
  font-weight: 600;
  display: block;
}

.stacked-form select {
  min-height: var(--tap);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.container {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1rem 1rem 2.5rem;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
  line-height: 1.25;
}

.section {
  margin-bottom: 1.75rem;
}

.stacked-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stacked-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.stacked-form input {
  min-height: var(--tap);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.stacked-form button {
  min-height: var(--tap);
  margin-top: 0.25rem;
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #0a0f14;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
}

.stacked-form button:hover {
  filter: brightness(1.08);
}

.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.card-link {
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.card-link:hover {
  color: var(--accent);
  text-decoration: none;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

.muted {
  color: var(--muted);
  font-size: 0.95rem;
}

.flash {
  background: rgba(108, 179, 255, 0.12);
  border: 1px solid var(--border);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.error {
  color: var(--error);
  margin: 0;
}

.back {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

@media (min-width: 480px) {
  h1 {
    font-size: 1.65rem;
  }

  .container {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}