:root {
  --brand-primary: #0c4a6e;
  --brand-accent: #0ea5e9;
  --brand-surface: #ffffff;
  --brand-muted: #64748b;
  --brand-border: #dbe7ef;
  --brand-panel: linear-gradient(180deg, #f7fbfe 0%, #eef7fb 100%);
  --brand-shadow: 0 24px 60px rgba(12, 74, 110, 0.12);
  --brand-danger: #dc2626;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.16), transparent 32%),
    linear-gradient(180deg, #f5fbff 0%, #ecf7fb 100%);
  color: #12344d;
}

body {
  display: flex;
  flex-direction: column;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  width: 180px;
  max-width: 100%;
  height: auto;
}

.brand-copy {
  display: flex;
  flex-direction: column;
}

.brand-copy strong {
  font-size: 1rem;
  color: var(--brand-primary);
}

.brand-copy span {
  font-size: 0.85rem;
  color: var(--brand-muted);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--brand-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--brand-primary);
  font-size: 0.88rem;
}

.layout {
  width: min(1360px, calc(100vw - 32px));
  margin: 20px auto 28px;
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 18px;
  flex: 1;
}

.sidebar,
.conference-panel {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(219, 231, 239, 0.8);
  border-radius: 28px;
  box-shadow: var(--brand-shadow);
}

.sidebar {
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  border-radius: 22px;
  border: 1px solid var(--brand-border);
  background: var(--brand-panel);
  padding: 18px;
}

.card h1,
.card h2,
.card h3,
.card p {
  margin: 0;
}

.headline {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.headline h1 {
  font-size: 1.7rem;
  line-height: 1.2;
  color: var(--brand-primary);
}

.headline p,
.meta-list li,
.status-text,
.small-note {
  color: var(--brand-muted);
  line-height: 1.5;
}

.meta-list {
  margin: 0;
  padding-left: 18px;
}

.form-grid {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--brand-primary);
  font-weight: 600;
}

input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--brand-border);
  padding: 12px 14px;
  font-size: 0.95rem;
  color: #12344d;
  background: rgba(255, 255, 255, 0.92);
}

input:focus {
  outline: 2px solid rgba(14, 165, 233, 0.18);
  border-color: var(--brand-accent);
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  border: 0;
  cursor: pointer;
  border-radius: 14px;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 700;
  transition: transform 120ms ease, opacity 120ms ease, box-shadow 120ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none;
}

.button-primary {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  color: #fff;
  box-shadow: 0 18px 40px rgba(14, 165, 233, 0.24);
}

.button-secondary {
  background: #ffffff;
  color: var(--brand-primary);
  border: 1px solid var(--brand-border);
}

.button-danger {
  background: linear-gradient(135deg, #ef4444, var(--brand-danger));
  color: #fff;
}

.status-banner {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(14, 165, 233, 0.18);
  background: rgba(255, 255, 255, 0.88);
}

.status-banner.error {
  border-color: rgba(220, 38, 38, 0.18);
  background: rgba(254, 242, 242, 0.95);
  color: #7f1d1d;
}

.status-banner.success {
  border-color: rgba(34, 197, 94, 0.18);
  background: rgba(240, 253, 244, 0.95);
  color: #166534;
}

.conference-panel {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 72vh;
}

.conference-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 4px;
}

.conference-header h2 {
  margin: 0;
  color: var(--brand-primary);
  font-size: 1.2rem;
}

.conference-header p {
  margin: 4px 0 0;
  color: var(--brand-muted);
  font-size: 0.92rem;
}

#conference {
  flex: 1;
  min-height: 620px;
  border-radius: 22px;
  overflow: hidden;
  background: linear-gradient(180deg, #dbeafe 0%, #eff6ff 100%);
  border: 1px solid rgba(191, 219, 254, 0.8);
}

.empty-state,
.overlay-state {
  width: 100%;
  height: 100%;
  min-height: 620px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.empty-state-card,
.overlay-card {
  max-width: 520px;
  padding: 28px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(219, 231, 239, 0.95);
  box-shadow: var(--brand-shadow);
}

.empty-state-card img,
.overlay-card img {
  width: 210px;
  max-width: 100%;
  margin-bottom: 18px;
}

.empty-state-card h3,
.overlay-card h3 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  color: var(--brand-primary);
}

.empty-state-card p,
.overlay-card p {
  margin: 0 0 16px;
  color: var(--brand-muted);
  line-height: 1.5;
}

.footer-note {
  text-align: center;
  color: var(--brand-muted);
  font-size: 0.85rem;
  padding: 0 24px 18px;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .conference-panel {
    min-height: 60vh;
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .layout {
    width: min(100vw - 18px, 100%);
    margin: 12px auto 20px;
  }

  .sidebar,
  .conference-panel {
    border-radius: 22px;
  }

  #conference,
  .empty-state,
  .overlay-state {
    min-height: 520px;
  }
}