/* ============================================================
   PAGE: THEME VARIABLES
   Global design tokens shared by every page (light + dark).
   ============================================================ */
:root {
  --bg-main: #ffffff;
  --bg-sidebar: #f7faff; /* Brand's soft blue background */
  --border-color: #c9cdd388; /* Brand's soft border color */
  --hover-bg: rgba(37, 99, 235, 0.08); /* Brand's blue hover overlay */
  --text-primary: #0f172a; /* Brand's ink color */
  --text-muted: #5d7290; /* Brand's mid-blue/gray text */
  --composer-bg: #f7faff; /* Brand's soft blue input background */
  --composer-border: #c9cdd3bb;
  --composer-shadow: 0 4px 15px rgba(15, 23, 42, 0.04);
  --user-msg-bg: #dbeafe; /* Brand's custom soft blue user bubble */
  --assistant-msg-bg: transparent;
  --btn-send-bg: #2563eb; /* Brand's primary royal blue */
  --btn-send-color: #ffffff;
  --accent-blue: #2563eb;
  --accent-blue-soft: #dbeafe;
  --ai-avatar-bg: linear-gradient(
    135deg,
    #2563eb 0%,
    #1d4ed8 100%
  ); /* Brand's gradient */
  --ai-avatar-color: #ffffff;
  --tutor-card-bg: #ffffff;
  --tutor-card-border: #c9cdd388;
  --tutor-card-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
  --code-header-bg: #e2e8f0;
  --code-body-bg: #0f172a; /* Brand's ink navy */
  --code-body-text: #f8fafc;
}

html.dark {
  --bg-main: #0b0f19; /* Website footer deep navy/black */
  --bg-sidebar: #101a33; /* Website custom brand navy */
  --border-color: rgba(144, 169, 207, 0.15);
  --hover-bg: rgba(37, 99, 235, 0.15); /* Translucent royal blue */
  --text-primary: #f8fafc;
  --text-muted: #90a9cf; /* Brand's muted grey-blue */
  --composer-bg: #101a33;
  --composer-border: rgba(144, 169, 207, 0.25);
  --composer-shadow: 0 0 25px rgba(0, 0, 0, 0.4);
  --user-msg-bg: rgba(37, 99, 235, 0.25); /* Translucent brand blue bubble */
  --assistant-msg-bg: transparent;
  --btn-send-bg: #f8fafc;
  --btn-send-color: #0b0f19;
  --accent-blue: #3b82f6; /* Slightly brighter blue in dark mode */
  --accent-blue-soft: rgba(59, 130, 246, 0.15);
  --ai-avatar-bg: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  --ai-avatar-color: #ffffff;
  --tutor-card-bg: rgba(16, 26, 51, 0.7);
  --tutor-card-border: rgba(144, 169, 207, 0.1);
  --tutor-card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
  --code-header-bg: #101a33;
  --code-body-bg: #070a13;
  --code-body-text: #e2e8f0;
}

/* ============================================================
     PAGE: APP SHELL — SIDEBAR (global chrome used on every page)
     ============================================================ */
/* Full Screen Container */
.chat-app {
  height: 100vh;
  height: 100svh;
  width: 100%;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  background: var(--bg-main);
  color: var(--text-primary);
  font-family:
    Söhne,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  transition: grid-template-columns 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-app.sidebar-collapsed {
  grid-template-columns: 0px minmax(0, 1fr);
}

/* Left Sidebar Styling */
.sidebar-container {
  height: 100vh;
  height: 100svh; /* svh = small viewport height: never cut off by mobile browser chrome */
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  transition:
    transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.25s;
  z-index: 50;
}

.chat-app.sidebar-collapsed .sidebar-container {
  transform: translateX(-100%);
  visibility: hidden;
  pointer-events: none;
}

.sidebar-header {
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.new-chat-btn {
  flex: 1;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: transparent;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease;
}

.new-chat-btn:hover {
  background: var(--hover-bg);
}

.sidebar-toggle-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: transparent;
  color: var(--text-primary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 0.2s ease;
}

.sidebar-toggle-btn:hover {
  background: var(--hover-bg);
}

/* Sidebar Search */
.sidebar-search-box {
  margin: 4px 10px;
  position: relative;
  display: flex;
  align-items: center;
}

.sidebar-search-box input {
  width: 100%;
  height: 34px;
  background: var(--composer-bg);
  border: 1px solid var(--composer-border);
  border-radius: 6px;
  padding: 0 10px 0 32px;
  font-size: 13px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s ease;
}

.sidebar-search-box input:focus {
  border-color: var(--accent-blue);
}

.sidebar-search-box svg {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
}

/* Sidebar Middle Scroll Area */
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 4px 6px;
}

.sidebar-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 4px 10px 4px;
  letter-spacing: 0.05em;
}

.sidebar-link-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  margin-bottom: 2px;
}

.sidebar-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.2s ease;
  flex: 1;
  padding-right: 32px;
}

.sidebar-link:hover,
.sidebar-link.active {
  background: var(--hover-bg);
}

.sidebar-nav-badge {
  position: absolute;
  right: 10px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 999px;
  background: #dc2626;
  color: #ffffff;
  font-size: 11px;
  font-weight: 800;
  line-height: 18px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(220, 38, 38, 0.35);
}

.sidebar-nav-badge.is-green {
  background: #16a34a;
  box-shadow: 0 2px 6px rgba(22, 163, 74, 0.35);
}

/* Shared admin page hero (used on all admin pages except the Overview) */
.mtc-homepage-admin-hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  border-radius: 22px;
  background: linear-gradient(135deg, #0f172a, #2563eb);
  color: #ffffff;
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: 0 24px 60px rgba(37, 99, 235, 0.18);
}

.mtc-homepage-admin-hero h1 {
  margin: 0 0 8px;
  color: #ffffff;
  font-size: 30px;
  font-weight: 900;
}

.mtc-homepage-admin-hero p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  max-width: 680px;
  line-height: 1.55;
}

.mtc-home-featured-count {
  flex: 0 0 auto;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
  font-weight: 850;
  font-size: 13px;
  padding: 10px 15px;
}

.delete-chat-btn {
  position: absolute;
  right: 8px;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  display: none; /* hidden by default */
  place-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 10;
}

.sidebar-link-wrapper:hover .delete-chat-btn {
  display: grid; /* show on hover */
}

.delete-chat-btn:hover {
  color: #ef4444; /* red on hover */
  background: var(--hover-bg);
}

.sidebar-link svg {
  flex-shrink: 0;
  color: var(--text-muted);
}

.sidebar-link span {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Bottom Controls */
.sidebar-footer {
  border-top: 1px solid var(--border-color);
  padding: 6px 10px 5px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: var(--bg-sidebar);
  margin-top: -20px;
}

.theme-selector-bar {
  display: flex;
  background: var(--composer-bg);
  border: 1px solid var(--composer-border);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}

.theme-btn-option {
  flex: 1;
  height: 28px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 11px;
  transition: all 0.2s ease;
}

.theme-btn-option.active {
  background: var(--bg-main);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.user-profile-widget {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 8px;
  color: var(--text-primary);
  transition: background 0.2s ease;
  cursor: pointer;
}

.user-profile-widget:hover {
  background: var(--hover-bg);
}

.user-avatar-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ai-avatar-bg);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 600;
}

.user-info-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.user-info-text strong {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-info-text span {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================================
     PAGE: APP SHELL — TOP HEADER & MODEL DROPDOWN (global chrome)
     ============================================================ */
/* Main App Container */
.chat-pane {
  height: 100vh;
  height: 100svh;
  display: grid;
  grid-template-rows: 56px minmax(0, 1fr);
  background: var(--bg-main);
  position: relative;
}

/* Top Bar Header */
.top-header {
  height: 56px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: relative;
  z-index: 40;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.floating-sidebar-toggle {
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: 6px;
  display: grid;
  place-items: center;
  transition: background 0.2s ease;
}

.floating-sidebar-toggle:hover {
  background: var(--hover-bg);
}

/* Dropdown Selector for Models */
.model-select-wrapper {
  position: relative;
}

.model-dropdown-trigger {
  background: transparent;
  border: 0;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.model-dropdown-trigger:hover {
  background: var(--hover-bg);
}

.model-menu-panel {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-sidebar);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow:
    0 10px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
  padding: 6px;
  min-width: 240px;
  display: none;
  z-index: 100;
}

.model-menu-panel.show {
  display: block;
}

.model-option-item {
  display: flex;
  flex-direction: column;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.model-option-item:hover {
  background: var(--hover-bg);
}

.model-option-item strong {
  font-size: 13px;
  color: var(--text-primary);
}

.model-option-item span {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================================================
     PAGE: AI ASSISTANT CHAT (home / chat page with the assistant)
     ============================================================ */
/* Empty State Presentation */
.chat-view-viewport {
  display: flex;
  flex-direction: column;
  min-height: 0;
  position: relative;
}

.empty-chat-welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 24px;
  overflow-y: auto;
}

.welcome-inner-content {
  width: min(720px, 100%);
  text-align: center;
  margin-top: -8vh;
}

.welcome-ai-badge {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--ai-avatar-bg);
  color: #ffffff;
  display: grid;
  place-items: center;
  margin: 0 auto 16px;
  box-shadow: 0 8px 24px rgba(16, 163, 127, 0.2);
}

.welcome-headline {
  font-size: 28px;
  font-weight: 600;
  margin: 0 0 32px;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* Suggestion Cards 2x2 Grid */
.suggestion-prompts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
  text-align: left;
}

.prompt-suggest-card {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

.prompt-suggest-card:hover {
  background: var(--hover-bg);
  border-color: var(--composer-border);
  transform: translateY(-1px);
}

.suggest-card-body {
  flex: 1;
}

.suggest-card-category {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.suggest-card-text {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.suggest-card-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--composer-bg);
  color: var(--text-primary);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

/* Chat Log Thread */
.message-scroll-thread {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px;
}

.message-thread-inner {
  width: min(720px, 100%);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* Message Elements */
.chat-msg-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.chat-msg-row.user-msg {
  justify-content: flex-end;
}

.avatar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.avatar-avatar.ai-icon {
  background: var(--ai-avatar-bg);
  color: var(--ai-avatar-color);
}

.avatar-avatar.user-icon {
  background: #e0f2fe;
  color: #0369a1;
}

.msg-body-container {
  flex: 1;
  min-width: 0;
}

.chat-msg-row.user-msg .msg-body-container {
  flex: 0 1 auto;
  max-width: 80%;
}

.msg-text-bubble {
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  word-break: break-word;
}

.chat-msg-row.user-msg .msg-text-bubble {
  background: var(--user-msg-bg);
  border-radius: 18px;
  padding: 10px 16px;
}

/* AI Thinking Indicator bubble */
.ai-thinking-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 4px 6px;
}

.ai-thinking-indicator span {
  width: 8px;
  height: 8px;
  background-color: var(--text-primary);
  border-radius: 50%;
  opacity: 0.4;
  animation: bounce-dots 1.4s infinite ease-in-out both;
}

.ai-thinking-indicator span:nth-child(1) {
  animation-delay: -0.32s;
}

.ai-thinking-indicator span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce-dots {
  0%,
  80%,
  100% {
    transform: scale(0.3);
    opacity: 0.2;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Markdown formatted styles inside bubble */
.md-para {
  margin: 0 0 12px;
}
.md-para:last-child {
  margin-bottom: 0;
}

.inline-code {
  background: var(--composer-bg);
  border: 1px solid var(--border-color);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: Consolas, Monaco, monospace;
  font-size: 13px;
}

.markdown-list {
  margin: 0 0 14px;
  padding-left: 20px;
}
.markdown-list li {
  margin-bottom: 4px;
}

/* Code block containers styled like ChatGPT */
.code-container {
  border-radius: 8px;
  overflow: hidden;
  margin: 14px 0;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.code-header {
  background: var(--code-header-bg);
  padding: 8px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.code-lang {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

.copy-code-btn {
  background: transparent;
  border: 0;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 4px;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}

.copy-code-btn:hover {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.code-container pre {
  margin: 0;
  padding: 16px;
  background: var(--code-body-bg);
  color: var(--code-body-text);
  overflow-x: auto;
}

.code-container code {
  font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
  font-size: 13px;
  line-height: 1.5;
}

/* Tutor Recommendation Cards Panel (shown inside AI chat) */
.tutor-matches-row {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.tutor-match-card {
  background: var(--tutor-card-bg);
  border: 1px solid var(--tutor-card-border);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--tutor-card-shadow);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.tutor-match-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
}

.tutor-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tutor-photo-wrap {
  position: relative;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
}

.tutor-photo-wrap img {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
}

.tutor-verified-badge {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 16px;
  height: 16px;
  background: #10a37f;
  border-radius: 50%;
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 9px;
  border: 2px solid var(--tutor-card-bg);
}

.tutor-headline-meta {
  min-width: 0;
}

.tutor-headline-meta strong {
  display: block;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tutor-headline-meta span {
  font-size: 11px;
  color: var(--text-muted);
  background: var(--composer-bg);
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
  margin-top: 2px;
}

.tutor-stat-badge {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.4;
}

.tutor-match-rating-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--accent-blue-soft);
  color: var(--accent-blue);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 12px;
  align-self: flex-start;
}

.tutor-card-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: auto;
}

.tutor-btn {
  height: 32px;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tutor-btn-secondary {
  background: var(--composer-bg);
  border: 1px solid var(--composer-border);
  color: var(--text-primary);
}

.tutor-btn-secondary:hover {
  background: var(--hover-bg);
}

.tutor-btn-primary {
  background: var(--accent-blue);
  border: 0;
  color: #ffffff;
}

.tutor-btn-primary:hover {
  opacity: 0.9;
}
/* Bottom Input Composer Area */
.composer-footer-wrap {
  padding: 10px 24px 22px;
  margin-top: -12px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0),
    var(--bg-main) 20%
  );
  z-index: 100;
  position: relative;
} z-index: 30;
}

.composer-inner-card {
  width: min(720px, 100%);
  margin: 0 auto;
  border: 1px solid var(--composer-border);
  border-radius: 24px;
  background: var(--bg-main);
  box-shadow: var(--composer-shadow);
  padding: 10px 14px 10px;
  display: flex;
  flex-direction: column;
}

.composer-input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.composer-attach-btn {
  width: 36px;
  height: 36px;
  border: 0;
  background: transparent;
  border-radius: 50%;
  color: var(--text-primary);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease;
  flex-shrink: 0;
}

.composer-attach-btn:hover {
  background: var(--hover-bg);
}

.composer-textarea {
  flex: 1;
  min-height: 36px;
  max-height: 200px;
  border: 0;
  resize: none;
  outline: 0;
  padding: 8px 4px;
  color: var(--text-primary);
  font: inherit;
  font-size: 15px;
  line-height: 1.5;
  background: transparent;
}

.composer-textarea::placeholder {
  color: var(--text-muted);
}

.composer-send-btn {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 50%;
  background: var(--border-color);
  color: var(--bg-main);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.composer-send-btn.active {
  background: var(--btn-send-bg);
  color: var(--btn-send-color);
}

.composer-disclaimer {
  width: min(720px, 100%);
  margin: 8px auto 0;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
}

/* ============================================================
     PAGE: CHAT CONVERSATION (Student / Tutor / Admin message thread)
     ============================================================ */
.chat-app > .mtc-admin-sidebar {
  height: 100vh;
  height: 100svh;
  border-radius: 0;
  border: 0;
  border-right: 1px solid var(--border-color);
  box-shadow: none;
  position: static;
}

.chat-thread-header {
  height: 64px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-main);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
}
.chat-thread-header .cth-back {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.2s ease;
}
.chat-thread-header .cth-back:hover {
  background: var(--hover-bg);
}
.chat-thread-header .cth-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ai-avatar-bg);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
  overflow: hidden;
  flex-shrink: 0;
}
.chat-thread-header .cth-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.chat-thread-header .cth-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}
.chat-thread-header .cth-rate {
  margin-left: auto;
  font-size: 13px;
  color: var(--text-muted);
}

.msg-time {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  opacity: 0.7;
}
.chat-msg-row.user-msg .msg-time {
  text-align: right;
}

/* Chat conversation bubbles: sender = blue, receiver = gray */
.chat-conversation .chat-msg-row.user-msg .msg-text-bubble {
  background: #2563eb;
  color: #ffffff;
}
.chat-conversation .chat-msg-row.assistant-msg .msg-text-bubble {
  background: #e2e8f0;
  color: #0f172a;
  border-radius: 18px;
  padding: 10px 16px;
}
.chat-conversation .chat-msg-row.assistant-msg .msg-body-container {
  flex: 0 1 auto;
  max-width: 80%;
}
html.dark .chat-conversation .chat-msg-row.user-msg .msg-text-bubble {
  background: #2563eb;
  color: #ffffff;
}
html.dark .chat-conversation .chat-msg-row.assistant-msg .msg-text-bubble {
  background: #1e293b;
  color: #e2e8f0;
}

/* ============================================================
     PAGE: RESPONSIVE LAYOUT (global app shell + student workspace)
     ============================================================ */
/* Mobile overlay backdrop for the sidebar */
.sidebar-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100svh;
  background: rgba(0, 0, 0, 0.4);
  z-index: 45;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .chat-app {
    grid-template-columns: minmax(0, 1fr);
  }

  /* On mobile, hide the desktop close/open sidebar toggle and
       show only the hamburger icon that opens the menu. */
  #desk-toggle-btn,
  .floating-sidebar-toggle#desk-toggle-btn {
    display: none !important;
  }

  #mobile-toggle-btn,
  .floating-sidebar-toggle#mobile-toggle-btn {
    display: grid !important;
  }

  /* On mobile the menu closes via the backdrop, so hide the
       in-sidebar close icon. */
  .sidebar-header .sidebar-toggle-btn {
    display: none !important;
  }

  .sidebar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    height: 100svh;
    transform: translateX(-100%);
    visibility: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
  }

  .chat-app.sidebar-open .sidebar-container {
    transform: translateX(0);
    visibility: visible;
  }

  .chat-app.sidebar-open .sidebar-backdrop {
    display: block;
  }

  .suggestion-prompts-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .composer-footer-wrap {
    padding: 8px 12px 14px;
  }
}

/* Tablet behaviour for the student workspace: no open/close sidebar,
     only a hamburger menu that opens the sidebar as an overlay. */
@media (max-width: 1024px) {
  .chat-app.student-workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .chat-app.student-workspace #desk-toggle-btn,
  .chat-app.student-workspace .floating-sidebar-toggle#desk-toggle-btn {
    display: none !important;
  }

  .chat-app.student-workspace #mobile-toggle-btn,
  .chat-app.student-workspace .floating-sidebar-toggle#mobile-toggle-btn {
    display: grid !important;
  }

  .chat-app.student-workspace .sidebar-header .sidebar-toggle-btn {
    display: none !important;
  }

  .chat-app.student-workspace .sidebar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    height: 100svh;
    transform: translateX(-100%);
    visibility: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);
  }

  .chat-app.student-workspace.sidebar-open .sidebar-container {
    transform: translateX(0);
    visibility: visible;
  }

  .chat-app.student-workspace.sidebar-open .sidebar-backdrop {
    display: block;
  }
}

/* Desktop (sidebar can be closed): when the sidebar is collapsed, the
     content fills the full width, so add horizontal breathing room so it
     doesn't sit flush against the screen edges. */
@media (min-width: 1025px) {
  .chat-app.student-workspace.sidebar-collapsed .chat-view-viewport {
    padding-left: 40px;
    padding-right: 40px;
  }
  .chat-app.student-workspace.sidebar-collapsed .chat-pane .top-header {
    padding-left: 40px;
    padding-right: 40px;
  }
}

/* Student workspace on mobile: keep the pane full-width and the
     content centered. Prevent any horizontal overflow (the viewport is a
     column flex with overflow-y:auto, which otherwise enables horizontal
     scrolling and shifts the centered content off-center). */
/* Student account pages on mobile: center the content like the home page
     using a single breakpoint so every phone screen is centered. The media
     query is placed after the base rules so it always wins on small screens. */

.chat-app.student-workspace .chat-pane {
  width: 100%;
  min-width: 0;
}
.chat-app.student-workspace .chat-view-viewport {
  width: 100%;
  min-width: 0;
  overflow-x: hidden;
  padding-left: 4px;
  padding-right: 4px;
  box-sizing: border-box;
}
.chat-app.student-workspace .mtc-shell {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  margin: 0 auto;
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .chat-app.student-workspace {
    grid-template-columns: minmax(0, 1fr);
  }
  .chat-app.student-workspace .chat-pane {
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
  }
  .chat-app.student-workspace .chat-view-viewport {
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
    box-sizing: border-box;
  }
  .chat-app.student-workspace .mtc-shell {
    width: min(1140px, calc(100% - 4px));
    max-width: 100%;
    min-width: 0;
    margin: 0 auto;
    box-sizing: border-box;
  }
}

@media (max-width: 390px) {
  .chat-app.student-workspace .mtc-shell {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding-left: 8px !important;
    padding-right: 8px !important;
  }

  .chat-app.student-workspace .chat-view-viewport {
    padding-left: 0;
    padding-right: 0;
  }
}

/* ============================================================
     PAGE: DARK MODE — STUDENT PAGES RE-SKIN
     Re-skin the white content containers on the dashboard, bookings
     and chat pages when dark mode is enabled.
     ============================================================ */
html.dark {
  --dash-surface: #101a33; /* Card surface (matches sidebar) */
  --dash-surface-2: #16244a; /* Alt / hover surface */
  --dash-border: rgba(144, 169, 207, 0.18);
  --dash-text: #e8eef7;
  --dash-muted: #90a9cf;
  --soft: #16213d; /* Recolors inline "Need Help" card */
}

/* --- Dashboard content --- */
html.dark .mtc-admin-content h1 {
  color: var(--dash-text);
}

html.dark .mtc-admin-card {
  background: var(--dash-surface);
  border-color: var(--dash-border);
}
html.dark .mtc-admin-card h2 {
  color: #7eb0ff;
}
html.dark .mtc-admin-card p {
  color: var(--dash-muted);
}

html.dark .mtc-admin-metric-card {
  background: var(--dash-surface);
  border-color: var(--dash-border);
}
html.dark .mtc-admin-metric-card strong {
  color: var(--dash-text);
}

/* --- Admin dashboard: keep it light even when dark mode is enabled --- */
html.dark .admin-dashboard-light {
  --dash-surface: #ffffff;
  --dash-surface-2: #f1f5f9;
  --dash-border: #e2e8f0;
  --dash-text: #0f172a;
  --dash-muted: #64748b;
  --soft: #eff6ff;
}
html.dark .admin-dashboard-light .mtc-admin-content h1 {
  color: #12182c;
}
html.dark .admin-dashboard-light .mtc-admin-card {
  background: #ffffff;
  border-color: #e2e8f0;
}
html.dark .admin-dashboard-light .mtc-admin-card h2 {
  color: #1d4ed8;
}
html.dark .admin-dashboard-light .mtc-admin-card p {
  color: #64748b;
}
html.dark .admin-dashboard-light .mtc-admin-metric-card {
  background: #ffffff;
  border-color: #e2e8f0;
}
html.dark .admin-dashboard-light .mtc-admin-metric-card strong {
  color: #0f172a;
}

/* --- Admin chat list: keep it light even when dark mode is enabled --- */
html.dark .admin-dashboard-light .mtc-chat-eyebrow {
  color: #4a90d9;
}
html.dark .admin-dashboard-light .mtc-chat-title {
  color: #111827;
}
html.dark .admin-dashboard-light .mtc-chat-subtitle {
  color: #6b7280;
}
html.dark .admin-dashboard-light .mtc-chat-search input {
  background: #ffffff;
  color: #111827;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}
html.dark .admin-dashboard-light .mtc-chat-search input::placeholder {
  color: #9ca3af;
}
html.dark .admin-dashboard-light .mtc-chat-filter {
  background: #ffffff;
  border-color: #e5e7eb;
  color: #4b5563;
}
html.dark .admin-dashboard-light .mtc-chat-filter:hover {
  border-color: #4a7cff;
  color: #4a7cff;
}
html.dark .admin-dashboard-light .mtc-chat-filter.is-active {
  background: #4a7cff;
  border-color: #4a7cff;
  color: #ffffff;
}
html.dark .admin-dashboard-light .mtc-chat-card {
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}
html.dark .admin-dashboard-light .mtc-chat-card:hover {
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}
html.dark .admin-dashboard-light .mtc-chat-card.is-unread {
  background: #eff6ff;
}
html.dark .admin-dashboard-light .mtc-chat-card.is-unread:hover {
  background: #dbeafe;
}
html.dark .admin-dashboard-light .mtc-chat-name {
  color: #111827;
}
html.dark .admin-dashboard-light .mtc-chat-preview {
  color: #6b7280;
}
html.dark .admin-dashboard-light .mtc-chat-time {
  color: #9ca3af;
}
html.dark .admin-dashboard-light .mtc-chat-booking-pill {
  background: #eff6ff;
  color: #2563eb;
}
html.dark .admin-dashboard-light .mtc-chat-pagination a {
  background: #ffffff;
  border-color: #e5e7eb;
  color: #4b5563;
}
html.dark .admin-dashboard-light .mtc-chat-pagination a:hover {
  border-color: #4a7cff;
  color: #4a7cff;
}
html.dark .admin-dashboard-light .mtc-chat-pagination .is-disabled {
  color: #9ca3af;
}
html.dark .admin-dashboard-light .mtc-chat-empty p {
  color: #111827;
}
html.dark .admin-dashboard-light .mtc-chat-empty small {
  color: #6b7280;
}
html.dark .admin-dashboard-light .mtc-chat-empty-icon {
  background: #eff6ff;
  color: #2563eb;
}

/* --- Tutor bookings: keep scrollbars / disabled controls light --- */
html.dark .admin-dashboard-light .mtc-student-bookings-table-wrap {
  scrollbar-color: #bfdbfe #f8fafc;
}
html.dark
  .admin-dashboard-light
  .mtc-student-bookings-table-wrap::-webkit-scrollbar-track {
  background: #f8fafc;
}
html.dark
  .admin-dashboard-light
  .mtc-student-bookings-table-wrap::-webkit-scrollbar-thumb {
  background: #bfdbfe;
  border-color: #f8fafc;
}
html.dark
  .admin-dashboard-light
  .mtc-bookings-pagination-controls
  .is-disabled {
  color: #94a3b8;
}

html.dark .mtc-dashboard-booking-row {
  background: var(--dash-surface-2);
  border-color: var(--dash-border);
}
html.dark .mtc-dashboard-booking-row:hover {
  border-color: #60a5fa;
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.25), 0 10px 24px rgba(0, 0, 0, 0.25);
}
html.dark .mtc-dashboard-booking-tutor strong {
  color: var(--dash-text);
}

html.dark .mtc-recommended-tutor-card {
  background: var(--dash-surface);
  border-color: var(--dash-border);
}
html.dark .mtc-recommended-tutor-copy h3 {
  color: var(--dash-text);
}
html.dark .mtc-recommended-tutor-copy p {
  color: var(--dash-muted);
}

/* --- Bookings page --- */
html.dark .mtc-student-bookings-card {
  background: var(--dash-surface);
  border-color: var(--dash-border);
}
html.dark .mtc-student-bookings-card-head h2 {
  color: var(--dash-text);
}
html.dark .mtc-student-bookings-card-head p {
  color: var(--dash-muted);
}
html.dark .mtc-student-bookings-table-wrap {
  scrollbar-color: #2b3c63 var(--dash-surface);
}
html.dark .mtc-student-bookings-table-wrap::-webkit-scrollbar-track {
  background: var(--dash-surface);
}
html.dark .mtc-student-bookings-table-wrap::-webkit-scrollbar-thumb {
  background: #2b3c63;
  border-color: var(--dash-surface);
}
html.dark .mtc-student-bookings-table th {
  background: var(--dash-surface-2);
  color: var(--dash-muted);
}
html.dark .mtc-student-bookings-table td {
  color: var(--dash-text);
}
html.dark .mtc-student-bookings-table tbody tr:hover {
  background: var(--dash-surface-2);
}
html.dark .mtc-student-bookings-tutor strong {
  color: var(--dash-text);
}
html.dark .mtc-student-bookings-tutor small {
  color: var(--dash-muted);
}
html.dark .mtc-student-bookings-empty h2 {
  color: var(--dash-text);
}
html.dark .mtc-student-bookings-empty p {
  color: var(--dash-muted);
}
html.dark .mtc-bookings-pagination {
  border-color: var(--dash-border);
}
html.dark .mtc-bookings-pagination-controls a,
html.dark .mtc-bookings-pagination-controls span {
  background: var(--dash-surface);
  border-color: var(--dash-border);
  color: var(--dash-text);
}
html.dark .mtc-bookings-pagination-controls .is-disabled {
  background: var(--dash-surface-2);
  color: #5f6f8c;
}

/* --- Saved tutors page cards --- */
html.dark .student-workspace .tutor-public-card {
  background: var(--dash-surface);
  border-color: var(--dash-border);
}
html.dark .student-workspace .tutor-public-card:hover {
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.35);
}
html.dark .student-workspace .tutor-public-photo {
  background: var(--dash-surface-2);
}
html.dark .student-workspace .tutor-public-photo-placeholder {
  background: #2563eb;
  color: #ffffff;
}
html.dark .student-workspace .tutor-public-body h3 {
  color: var(--dash-text);
}
html.dark .student-workspace .tutor-subject-pill {
  background: var(--dash-surface-2);
  color: var(--dash-muted);
  border-color: var(--dash-border);
}
html.dark .student-workspace .tutor-public-meta {
  color: var(--dash-muted);
  border-top-color: var(--dash-border);
}
html.dark .student-workspace .tutor-rate-badge {
  color: #60a5fa;
}
html.dark .student-workspace .tutor-public-cta {
  background: var(--dash-surface);
  border-color: var(--dash-border);
  color: var(--dash-text);
}
html.dark .student-workspace .tutor-public-cta:hover {
  background: var(--dash-surface-2);
  border-color: #4a7cff;
  color: #7eb0ff;
}
html.dark .student-workspace .tutor-public-photo .save-tutor-btn {
  background: rgba(0, 0, 0, 0.35);
  color: #60a5fa;
}
html.dark .student-workspace .tutor-subjects-empty {
  color: var(--dash-muted);
}

/* --- Chat page --- */
html.dark .mtc-chat-page {
  background: transparent;
}
html.dark .mtc-chat-eyebrow {
  color: #7eb0ff;
}
html.dark .mtc-chat-title {
  color: var(--dash-text);
}
html.dark .mtc-chat-subtitle {
  color: var(--dash-muted);
}
html.dark .mtc-chat-search input {
  background: var(--dash-surface);
  color: var(--dash-text);
  box-shadow: none;
}
html.dark .mtc-chat-search input::placeholder {
  color: #6b7a99;
}
html.dark .mtc-chat-filter {
  background: var(--dash-surface);
  border-color: var(--dash-border);
  color: var(--dash-muted);
}
html.dark .mtc-chat-filter:hover {
  border-color: #4a7cff;
  color: #7eb0ff;
}
html.dark .mtc-chat-filter.is-active {
  background: #4a7cff;
  border-color: #4a7cff;
  color: #ffffff;
}
html.dark .mtc-chat-card {
  background: var(--dash-surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}
html.dark .mtc-chat-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
html.dark .mtc-chat-card.is-unread {
  background: #16244a;
}
html.dark .mtc-chat-card.is-unread:hover {
  background: #1b2c54;
}
html.dark .mtc-chat-name {
  color: var(--dash-text);
}
html.dark .mtc-chat-preview {
  color: var(--dash-muted);
}
html.dark .mtc-chat-time {
  color: #6b7a99;
}
html.dark .mtc-chat-booking-pill {
  background: #16244a;
  color: #7eb0ff;
}
html.dark .mtc-chat-pagination a {
  background: var(--dash-surface);
  border-color: var(--dash-border);
  color: var(--dash-muted);
}
html.dark .mtc-chat-pagination a:hover {
  border-color: #4a7cff;
  color: #7eb0ff;
}
html.dark .mtc-chat-pagination .is-disabled {
  background: var(--dash-surface-2);
  color: #5f6f8c;
}
html.dark .mtc-chat-empty p {
  color: var(--dash-text);
}
html.dark .mtc-chat-empty small {
  color: var(--dash-muted);
}
html.dark .mtc-chat-empty-icon {
  background: #16244a;
  color: #7eb0ff;
}