/* ================================================================
   Announcements + Instructor Portal
   Clean, neutral aesthetic — no teal, no orange, no emoji
   ================================================================ */

/* ── Header bell icon ── */

.ann-bell {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.4rem;
  color: currentColor;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s;
}
.ann-bell:hover { opacity: 1; }
.ann-bell svg { display: block; }

.ann-bell-dot {
  position: absolute;
  top: 4px; right: 2px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--redis-red, #FF4438);
  border: 2px solid var(--redis-midnight, #091A23);
  box-sizing: content-box;
  animation: ann-pulse 2s ease-in-out infinite;
}
@keyframes ann-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.instructor-header-link {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem;
  color: currentColor;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.15s;
  text-decoration: none;
}
.instructor-header-link:hover { opacity: 1; color: currentColor; }
.instructor-header-link svg { display: block; }

/* ── Learner announcements board ── */

.ann-card {
  border-radius: 8px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.6rem;
  background: var(--md-default-bg-color);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  border: 1px solid rgba(0,0,0,0.06);
  transition: box-shadow 0.15s;
}
.ann-card:hover {
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.ann-card.ann-pinned {
  border-left: 3px solid var(--md-primary-fg-color);
}

.ann-pin-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--md-primary-fg-color);
  margin-bottom: 0.3rem;
}

.ann-content {
  font-size: 0.92rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--md-code-font-family);
}

.ann-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--md-default-fg-color--light);
}

.ann-admin-actions {
  display: flex;
  gap: 0.25rem;
}

.ann-copy {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: 0.75rem;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: all 0.15s;
}
.ann-copy:hover {
  background: var(--md-code-bg-color);
  color: var(--md-default-fg-color);
}

.ann-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: all 0.12s;
  opacity: 0.4;
}
.ann-icon-btn:hover {
  background: var(--md-code-bg-color);
  opacity: 1;
}
.ann-icon-btn.pinned {
  color: var(--md-primary-fg-color);
  opacity: 1;
}
.ann-icon-btn.ann-delete-btn:hover {
  color: #e53935;
}

.admin-card .ann-icon-btn {
  opacity: 0;
}
.admin-card:hover .ann-icon-btn {
  opacity: 0.5;
}
.admin-card:hover .ann-icon-btn:hover {
  opacity: 1;
}
.admin-card .ann-icon-btn.pinned {
  opacity: 1;
}

.ann-empty {
  padding: 2rem;
  text-align: center;
  color: var(--md-default-fg-color--light);
  font-size: 0.85rem;
}

/* ── Login gate ── */

#instructor-gate {
  display: flex;
  justify-content: center;
  padding: 4rem 1rem 2rem;
}
#instructor-gate[hidden] { display: none; }

.instructor-login-card {
  max-width: 300px;
  width: 100%;
  text-align: center;
}
.instructor-login-card h2 {
  margin: 0 0 0.25rem;
  font-size: 1.2rem;
  font-weight: 600;
}
.instructor-login-card > p {
  color: var(--md-default-fg-color--light);
  font-size: 0.85rem;
  margin: 0 0 1.25rem;
}
.instructor-login-card input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.88rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 6px;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  outline: none;
  box-sizing: border-box;
  margin-bottom: 0.75rem;
}
.instructor-login-card input:focus {
  border-color: var(--md-primary-fg-color);
}

#instructor-login-btn {
  width: 100%;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  cursor: pointer;
  transition: opacity 0.15s;
}
#instructor-login-btn:hover { opacity: 0.85; }
#instructor-login-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.instructor-error {
  color: #e53935;
  font-size: 0.82rem;
  margin: 0.75rem 0 0;
}

/* ── Layout: sidebar + main ── */

.instructor-layout {
  display: flex;
  gap: 0;
  min-height: calc(100vh - 6rem);
  margin: -1rem -0.8rem 0;
}

.instructor-sidebar {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--md-default-fg-color--lightest);
  padding: 1.25rem 0.75rem;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 4rem;
  height: calc(100vh - 5rem);
}

.instructor-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.instructor-nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  font-size: 0.84rem;
  color: var(--md-default-fg-color--light);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.12s;
}
.instructor-nav-item:hover {
  color: var(--md-default-fg-color);
  background: var(--md-code-bg-color);
}
.instructor-nav-item.active {
  color: var(--md-default-fg-color);
  background: var(--md-code-bg-color);
  font-weight: 600;
}
.instructor-nav-item svg {
  flex-shrink: 0;
  opacity: 0.5;
}
.instructor-nav-item.active svg { opacity: 0.8; }

.instructor-logout {
  padding: 0.4rem 0.65rem;
  font-size: 0.78rem;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  text-align: left;
  transition: color 0.12s;
}
.instructor-logout:hover {
  color: var(--md-default-fg-color);
}

.instructor-main {
  flex: 1;
  min-width: 0;
  padding: 1.5rem 2.5rem;
  max-width: 720px;
}

/* ── Section panels ── */

.instructor-section-panel[hidden] { display: none; }

.section-header { margin-bottom: 1.5rem; }
.section-header h1,
.section-header h2 {
  margin: 0 0 0.2rem !important;
  font-size: 1.4rem;
  font-weight: 600;
}
.section-header p {
  margin: 0;
  color: var(--md-default-fg-color--light);
  font-size: 0.84rem;
}

/* ── Compose name ── */

.compose-name {
  max-width: 200px;
  margin-bottom: 0.75rem;
  font-family: inherit;
}

/* ── Compose toggle ── */

.compose-toggle {
  display: inline-flex;
  background: var(--md-code-bg-color);
  border-radius: 6px;
  padding: 3px;
  margin-bottom: 0.75rem;
}

.compose-toggle-btn {
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: all 0.12s;
}
.compose-toggle-btn.active {
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.compose-mode[hidden] { display: none; }

.compose-row {
  display: flex;
  gap: 0.5rem;
}

.compose-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: 0.88rem;
  font-family: var(--md-code-font-family);
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 6px;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  outline: none;
  box-sizing: border-box;
}
.compose-input:focus {
  border-color: var(--md-primary-fg-color);
}
textarea.compose-input {
  resize: vertical;
  width: 100%;
}

.compose-btn {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  cursor: pointer;
  transition: opacity 0.15s;
  white-space: nowrap;
}
.compose-btn:hover { opacity: 0.85; }
.compose-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.compose-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* ── Posted list header ── */

.admin-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 1.5rem 0 0.6rem;
}
.admin-list-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--md-default-fg-color--light);
}

.admin-clear {
  padding: 0.25rem 0.5rem;
  font-size: 0.72rem;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: color 0.12s;
}
.admin-clear:hover { color: #e53935; }
.admin-clear:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Guide tab — neutral overrides ── */

#section-guide h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}
#section-guide h2:first-child,
.section-header h2 {
  margin-top: 0;
}

#section-guide h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

#section-guide p,
#section-guide li {
  font-size: 0.88rem;
  line-height: 1.65;
}

#section-guide .admonition,
#section-guide details {
  border: 1px solid var(--md-default-fg-color--lightest) !important;
  border-radius: 6px;
  background: var(--md-default-bg-color) !important;
  box-shadow: none !important;
  font-size: 0.88rem;
}

#section-guide .admonition-title,
#section-guide details summary {
  background: var(--md-code-bg-color) !important;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  color: var(--md-default-fg-color) !important;
  font-weight: 600;
  font-size: 0.88rem;
}

#section-guide .admonition-title::before,
#section-guide details summary::before {
  display: none !important;
}

#section-guide .admonition-title::after,
#section-guide details summary::after {
  color: var(--md-default-fg-color--light) !important;
}

#section-guide .admonition.warning {
  border-left: 3px solid var(--md-default-fg-color--light) !important;
}

#section-guide table {
  font-size: 0.85rem;
  border-collapse: collapse;
  width: 100%;
}
#section-guide th {
  background: transparent !important;
  border-bottom: 2px solid var(--md-default-fg-color--lightest);
  color: var(--md-default-fg-color--light);
  font-weight: 600;
  font-size: 0.8rem;
  text-align: left;
}
#section-guide td {
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
}

.guide-section {
  margin-bottom: 0;
}

/* ── Admin link on announcements page ── */

.admin-link {
  font-size: 0.8rem;
  opacity: 0.5;
  text-decoration: none;
}
.admin-link:hover { opacity: 1; }

/* ── Responsive ── */

@media (max-width: 768px) {
  .instructor-layout {
    flex-direction: column;
    margin: 0;
  }
  .instructor-sidebar {
    width: 100%;
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--md-default-fg-color--lightest);
    padding: 0.5rem 0.75rem;
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
  }
  .instructor-nav {
    flex-direction: row;
    gap: 0;
    flex: 1;
  }
  .instructor-nav-item {
    justify-content: center;
    flex: 1;
    padding: 0.5rem;
  }
  .instructor-main {
    padding: 1rem;
  }
}