:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #475569;
  --surface: #ffffff;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --border: rgba(148, 163, 184, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

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

header.site-header {
  position: sticky;
  top: 0;
  z-index: 24;
  background: linear-gradient(135deg, #1d4ed8, #0ea5e9);
  color: white;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.24);
}

header.site-header .wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1rem 1.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.6rem;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.brand span {
  opacity: 0.82;
  font-weight: 500;
}

nav.nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

nav.nav .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.42rem 0.9rem;
  border-radius: 999px;
  font-weight: 500;
  opacity: 0.92;
  transition: background 0.18s ease, transform 0.18s ease;
  background: transparent;
  color: inherit;
  border: none;
  cursor: pointer;
  font: inherit;
  appearance: none;
  text-decoration: none;
}

nav.nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

nav.nav .nav-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.6);
  outline-offset: 2px;
}

nav.nav .nav-link.active,
nav.nav .nav-item.active > .nav-link {
  background: rgba(255, 255, 255, 0.24);
  transform: translateY(-1px);
}

nav.nav .nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

nav.nav .nav-item.has-submenu > .nav-link::after {
  content: '▾';
  font-size: 0.7rem;
  margin-left: 0.25rem;
  transform: translateY(-1px);
  transition: transform 0.18s ease;
}

nav.nav .nav-item.open > .nav-link::after {
  transform: rotate(-180deg) translateY(2px);
}

nav.nav .nav-submenu {
  display: none;
  position: absolute;
  top: calc(100% + 0.55rem);
  left: 0;
  background: white;
  color: var(--fg);
  border-radius: 12px;
  padding: 0.45rem;
  min-width: 180px;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.24);
  z-index: 30;
  flex-direction: column;
}

nav.nav .nav-item.open .nav-submenu {
  display: flex;
}

nav.nav .submenu-link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.45rem;
  padding: 0.45rem 0.7rem;
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  font-weight: 500;
  font: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  appearance: none;
}

nav.nav .submenu-link:hover,
nav.nav .submenu-link:focus {
  background: rgba(37, 99, 235, 0.12);
  color: #1d4ed8;
  outline: none;
}

nav.nav .submenu-link.active {
  background: rgba(37, 99, 235, 0.18);
  color: #1d4ed8;
}

nav.nav .submenu-link.as-button {
  width: 100%;
}

.realm-switcher {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(15, 23, 42, 0.18);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
}

.realm-switcher label {
  font-weight: 600;
  font-size: 0.9rem;
}

.realm-switcher select {
  appearance: none;
  -webkit-appearance: none;
  border: none;
  background: white;
  color: #0f172a;
  font: inherit;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  min-width: 170px;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.2);
}

.realm-switcher select:disabled {
  opacity: 0.6;
  box-shadow: none;
}

.session {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.session-user {
  font-size: 0.92rem;
  opacity: 0.85;
}

.session-btn {
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(15, 23, 42, 0.12);
  color: white;
  border-radius: 999px;
  padding: 0.42rem 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.session-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 22px rgba(15, 23, 42, 0.24);
  transform: translateY(-1px);
}

main.content {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.8rem 1.8rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2.4rem;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 2.4rem;
  display: grid;
  gap: 1.2rem;
  box-shadow: 0 24px 52px rgba(15, 23, 42, 0.16);
}

.hero h1 {
  margin: 0;
  font-size: 2.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.hero p {
  margin: 0;
  font-size: 1.04rem;
  line-height: 1.65;
  color: var(--muted);
  max-width: 720px;
}

.hero .note {
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 16px;
  color: #1d4ed8;
  font-weight: 500;
}

.self-register {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 26px;
  padding: 2.2rem;
  box-shadow: 0 24px 52px rgba(15, 23, 42, 0.16);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.self-register-card {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  width: 100%;
}

.self-register-card h2 {
  margin: 0;
  font-size: 1.85rem;
  letter-spacing: -0.01em;
}

.self-register-card p {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

.self-register-card form {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.self-register-card label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--fg);
}

.self-register-card input {
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 12px;
  padding: 0.6rem 0.75rem;
  font: inherit;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.self-register-card input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.self-register-card button {
  border: none;
  border-radius: 12px;
  padding: 0.7rem 1.15rem;
  background: var(--accent);
  color: white;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-start;
  box-shadow: 0 16px 34px rgba(37, 99, 235, 0.24);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.self-register-card button:hover:not([disabled]) {
  transform: translateY(-1px);
  box-shadow: 0 22px 44px rgba(37, 99, 235, 0.28);
}

.self-register-card button[disabled] {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.self-register-message {
  display: none;
  font-size: 0.9rem;
}

.self-register-message[data-tone='success'] {
  color: #047857;
}

.self-register-message[data-tone='error'] {
  color: #b91c1c;
}

.self-register-note {
  font-size: 0.85rem;
  color: var(--muted);
}

.optional {
  font-weight: 500;
  color: var(--muted);
  font-size: 0.85rem;
}

.hero-intro {
  display: grid;
  gap: 1rem;
}

.canvas {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 1.6rem 1.8rem 2.4rem;
  box-shadow: 0 24px 52px rgba(15, 23, 42, 0.16);
}




.realm-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.4rem;
}

.realm-summary .realm-note {
  font-size: 0.88rem;
  color: var(--muted);
}

.realm-summary .realm-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  background: rgba(59, 130, 246, 0.18);
  color: #1d4ed8;
  text-transform: uppercase;
}

.realm-summary .realm-badge.public {
  background: rgba(34, 197, 94, 0.16);
  color: #166534;
}

.iframe-wrap {
  position: relative;
  width: 100%;
  border-radius: 22px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: #ffffff;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
  overflow: hidden;
}

.iframe-wrap iframe {
  position: static;
  width: 100%;
  min-height: 900px;
  height: auto;
  border: 0;
  background: white;
}

footer.site-footer {
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
  padding: 2.6rem 1rem 3.2rem;
}

@media (max-width: 768px) {
  header.site-header .wrap {
    justify-content: flex-start;
  }

  .realm-switcher {
    width: 100%;
    justify-content: flex-start;
  }

  .iframe-wrap {
    padding-top: 0;
  }
}