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

/* ── Session gate (split layout) ── */

#announcements-gate {
  display: flex;
  justify-content: center;
  padding: 2rem 1rem 6rem;
}
#announcements-gate[hidden] { display: none; }

.gate-split {
  display: flex;
  align-items: stretch;
  gap: 0;
  max-width: 720px;
  width: 100%;
}

.gate-card {
  flex: 1;
  text-align: center;
  padding: 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.gate-card h2 {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
  font-weight: 600;
}
.gate-card > p,
.gate-card > div > p {
  color: var(--md-default-fg-color--light);
  font-size: 0.82rem;
  font-weight: 400;
  font-style: normal;
  margin: 0 0 1.25rem;
}

#gate-instructor-authenticated[hidden] { display: none; }
#gate-instructor-form[hidden] { display: none; }
#gate-instructor-authenticated {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  justify-content: center;
}

.gate-open-portal {
  display: inline-block;
  width: 100%;
  max-width: 160px;
  text-align: center;
  text-decoration: none;
  box-sizing: border-box;
}

.gate-divider {
  width: 1px;
  background: var(--md-default-fg-color--lightest);
  margin: 0.5rem 0;
}

.gate-password-input {
  width: 100%;
  max-width: 160px;
  height: 60px;
  margin: 0 auto 0.75rem;
  padding: 0 0.75rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  letter-spacing: 0.05em;
  border: 2px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  outline: none;
  box-sizing: border-box;
  display: block;
}
.gate-password-input:focus {
  border-color: var(--md-primary-fg-color);
}

@media (max-width: 480px) {
  .gate-split {
    flex-direction: column;
    max-width: 280px;
  }
  .gate-divider {
    width: auto;
    height: 1px;
    margin: 0.5rem 1.5rem;
  }
}

.session-code-input {
  width: 100%;
  max-width: 160px;
  height: 60px;
  margin: 0 auto 0.75rem;
  padding: 0.75rem;
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--md-code-font-family);
  text-align: center;
  letter-spacing: 0.3em;
  border: 2px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  outline: none;
  box-sizing: border-box;
  display: block;
}
.session-code-input:focus {
  border-color: var(--md-primary-fg-color);
}

/* ── Session info bar (learner — above announcements) ── */

.session-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
  color: var(--md-default-fg-color--light);
  background: var(--md-code-bg-color);
  border-radius: 6px;
}

.session-leave-btn {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: all 0.12s;
}
.session-leave-btn:hover {
  color: var(--md-default-fg-color);
  border-color: var(--md-default-fg-color--light);
}

/* ── Session active header (instructor — two-row nav + code) ── */

.session-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.session-nav-back {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--md-default-fg-color--light);
  text-decoration: none;
  transition: color 0.12s;
}
.session-nav-back:hover {
  color: var(--md-default-fg-color);
}

.session-banner {
  background: var(--md-code-bg-color);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  text-align: center;
}

.session-banner-title {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--md-default-fg-color);
  margin-bottom: 0.15rem;
}

.session-banner-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--md-default-fg-color--light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
}

.session-banner-code {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--md-code-font-family);
  color: var(--md-default-fg-color);
  letter-spacing: 0.2em;
}

.session-banner-hint {
  display: block;
  font-size: 0.82rem;
  color: var(--md-default-fg-color--light);
  margin-top: 0.35rem;
}

.session-banner-end {
  margin-top: 0.75rem;
  padding: 0.3rem 0.75rem;
  font-size: 0.78rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  transition: all 0.12s;
}
.session-banner-end:hover {
  color: #e53935;
  border-color: #e53935;
}

/* ── Session start (instructor) ── */

#session-start[hidden] { display: none; }
#session-active[hidden] { display: none; }

#session-start .compose-input {
  margin-bottom: 0.5rem;
}

/* ── Active sessions list (instructor) ── */

#active-sessions {
  margin-top: 1.5rem;
}

.active-sessions-header {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--md-default-fg-color--light);
  margin-bottom: 0.5rem;
}

.active-sessions-empty {
  font-size: 0.82rem;
  color: var(--md-default-fg-color--lighter);
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.4rem;
  background: var(--md-code-bg-color);
  border-radius: 6px;
  cursor: pointer;
  transition: box-shadow 0.12s;
}
.session-item:hover {
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.session-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.session-item-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--md-default-fg-color);
}

.session-item-meta {
  font-size: 0.72rem;
  color: var(--md-default-fg-color--light);
}

.session-item-code {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--md-code-font-family);
  color: var(--md-default-fg-color);
  letter-spacing: 0.1em;
}

/* ── Tab icons — Home and Sessions ── */

.md-tabs__list > li:first-child > .md-tabs__link,
.md-tabs__link[href$="announcements/"] {
  font-size: 0 !important;
  letter-spacing: 0 !important;
  padding: 0 1rem !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.md-tabs__list > li:first-child > .md-tabs__link::before,
.md-tabs__link[href$="announcements/"]::before {
  font-size: initial;
  display: block;
  width: 20px;
  height: 20px;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 18px 18px;
  content: '';
}

.md-tabs__list > li:first-child > .md-tabs__link::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23DCFF1E' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z'/%3E%3Cpolyline points='9 22 9 12 15 12 15 22'/%3E%3C/svg%3E");
}

.md-tabs__link[href$="announcements/"]::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23DCFF1E' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M16 21v-2a4 4 0 0 0-4-4H6a4 4 0 0 0-4 4v2'/%3E%3Ccircle cx='9' cy='7' r='4'/%3E%3Cline x1='19' y1='8' x2='19' y2='14'/%3E%3Cline x1='22' y1='11' x2='16' y2='11'/%3E%3C/svg%3E");
}

/* ── Sessions page overrides ── */

.md-content__inner:has(#announcements-gate) > h1 {
  display: none;
}
.md-content__inner:has(#announcements-gate) {
  margin: 0;
  padding: 0;
}

#announcements-board {
  padding: 1rem 0 6rem;
}


/* ── Learner announcements board ── */

.ann-card {
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  margin-bottom: 0.4rem;
  background: var(--md-code-bg-color);
  border: none;
  transition: background 0.12s;
}
.ann-card:hover {
  background: var(--md-code-bg-color);
}
.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: 0.85rem;
  line-height: 1.5;
  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: 0.3rem;
  font-size: 0.7rem;
  color: var(--md-default-fg-color--lighter);
}

.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: 600px;
  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 bar (chat-style input) ── */

.compose-bar {
  background: var(--md-code-bg-color);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  margin-bottom: 1rem;
}

.compose-toggle {
  display: inline-flex;
  background: var(--md-default-bg-color);
  border-radius: 5px;
  padding: 2px;
  margin-bottom: 0.5rem;
}

.compose-toggle-btn {
  padding: 0.25rem 0.7rem;
  font-size: 0.75rem;
  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-code-bg-color);
  color: var(--md-default-fg-color);
  font-weight: 600;
}

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

.compose-row {
  display: flex;
  gap: 0.4rem;
}

.compose-input {
  flex: 1;
  padding: 0.45rem 0.65rem;
  font-size: 0.85rem;
  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);
}

.compose-btn {
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  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; }

/* ── Message list footer ── */

.admin-list-footer {
  text-align: right;
  margin-top: 0.5rem;
}

.admin-clear {
  padding: 0.2rem 0.4rem;
  font-size: 0.72rem;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--md-default-fg-color--lighter);
  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;
  }
}