:root {
  --bg-main: #090d16;
  --bg-ambient: radial-gradient(ellipse 68% 52% at 50% 42%, rgba(16, 71, 160, 0.20) 0%, rgba(0, 113, 227, 0.08) 42%, rgba(9, 13, 22, 0) 75%);
  --bg-topbar: rgba(9, 13, 22, 0.84);
  --bg-composer: #111827;
  --bg-composer-hover: #172033;
  --bg-surface: #0f1624;
  --bg-surface-elevated: #172135;
  --bg-surface-hover: #1e2b44;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-focus: rgba(0, 113, 227, 0.55);
  --text-main: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-brand: #38bdf8;
  --accent-electric: #0071e3;
  --accent-pill-bg: rgba(0, 113, 227, 0.14);
  --accent-pill-border: rgba(0, 113, 227, 0.48);
  --danger: #c0392b;
  --danger-hover: #a93226;
  --user-bubble-bg: #172135;
  --user-bubble-border: rgba(255, 255, 255, 0.10);
  --assistant-bubble-bg: transparent;
  --send-btn-bg: #1e2b44;
  --send-btn-active: #0071e3;
  --send-btn-active-fg: #ffffff;
  --shadow-composer: 0 18px 48px -12px rgba(0, 0, 0, 0.62);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-main: #f5f5f7;
  --bg-ambient: radial-gradient(ellipse 68% 52% at 50% 42%, rgba(16, 71, 160, 0.07) 0%, rgba(0, 113, 227, 0.04) 45%, rgba(245, 245, 247, 0) 75%);
  --bg-topbar: rgba(255, 255, 255, 0.88);
  --bg-composer: #ffffff;
  --bg-composer-hover: #f5f5f7;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #e8f0fb;
  --bg-surface-hover: #dbe7f9;
  --border-subtle: #d2d2d7;
  --border-medium: #b8b8bf;
  --border-focus: #1047a0;
  --text-main: #0a2540;
  --text-secondary: #1e3a5f;
  --text-muted: #4e4e54;
  --text-dim: #6e6e77;
  --accent-brand: #1047a0;
  --accent-electric: #0071e3;
  --accent-pill-bg: #e8f0fb;
  --accent-pill-border: rgba(16, 71, 160, 0.35);
  --user-bubble-bg: #e8f0fb;
  --user-bubble-border: rgba(16, 71, 160, 0.15);
  --assistant-bubble-bg: transparent;
  --send-btn-bg: #1047a0;
  --send-btn-active: #0071e3;
  --send-btn-active-fg: #ffffff;
  --shadow-composer: 0 8px 32px rgba(10, 37, 64, 0.08);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  height: 100dvh;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  background-color: var(--bg-main);
  background-image: var(--bg-ambient);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  overscroll-behavior-y: none;
}

/* Enforce sentence case with zero all-caps transformations */
h1, h2, h3, h4, h5, h6,
button,
span,
p,
a,
textarea {
  text-transform: none !important;
  font-variant: normal !important;
}

button {
  touch-action: manipulation;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.hidden {
  display: none !important;
}

/* App Shell */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  width: 100%;
  position: relative;
  padding-top: env(safe-area-inset-top, 0px);
}

/* Top Navigation Bar */
.topbar {
  height: 68px;
  padding: 0 36px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-topbar);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 20;
}

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

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.brand-mark svg {
  width: 28px;
  height: 28px;
}

.brand-name {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.018em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  padding: 8px 14px;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.icon-btn.icon-only {
  padding: 9px;
}

.icon-btn:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
  color: var(--text-main);
}

/* Main Workspace */
.workspace {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
  padding: 0 28px;
}

body.has-messages .workspace {
  justify-content: space-between;
  padding-top: 0;
}

/* Conversation Stream */
.chat-stream {
  display: none;
  width: 100%;
  max-width: 860px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 36px 12px 24px;
  flex-direction: column;
  gap: 26px;
  scroll-behavior: smooth;
}

body.has-messages .chat-stream {
  display: flex;
}

/* Stage Container (Centers Hero + Composer when empty, docks Composer when chatting) */
.stage-container {
  width: 100%;
  max-width: 840px;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform var(--transition-normal);
}

body.has-messages .stage-container {
  max-width: 860px;
  padding-bottom: 10px;
}

/* Empty-State Hero */
.welcome-hero {
  text-align: center;
  margin-bottom: 34px;
  animation: fadeIn var(--transition-normal);
}

body.has-messages .welcome-hero,
body.has-messages .category-bar,
body.has-messages .prompt-tray {
  display: none !important;
}

.hero-title-row {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 12px;
}

.hero-emblem {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.hero-emblem svg {
  width: 44px;
  height: 44px;
}

.hero-heading {
  font-size: clamp(34px, 3.2vw, 42px);
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text-main);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  font-weight: 400;
}

.hero-greeting-accent {
  color: var(--accent-brand);
  font-weight: 600;
  margin-left: 5px;
  display: inline-block;
  transition: opacity 220ms ease, transform 220ms ease;
}

/* Composer Card */
.composer-wrapper {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.composer-card {
  width: 100%;
  background-color: var(--bg-composer);
  border: 1px solid var(--border-medium);
  border-radius: 24px;
  box-shadow: var(--shadow-composer);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.composer-card:focus-within {
  border-color: var(--border-focus);
}

.composer-input-row {
  padding: 20px 24px 10px;
}

.prompt-textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.6;
  resize: none;
  outline: none;
  min-height: 54px;
  max-height: 180px;
}

.prompt-textarea::placeholder {
  color: var(--text-dim);
}

.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px 16px 20px;
  gap: 12px;
}

.composer-tools-left {
  display: flex;
  align-items: center;
  gap: 9px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  flex: 1;
  min-width: 0;
}

.composer-tools-left::-webkit-scrollbar {
  display: none;
}

.tool-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tool-pill:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-main);
}

.tool-pill.active {
  background-color: var(--accent-pill-bg);
  color: var(--accent-brand);
  border-color: var(--accent-pill-border);
}

.composer-tools-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.send-circle-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background-color: var(--send-btn-bg);
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.send-circle-btn:hover:not(:disabled) {
  background-color: var(--send-btn-active);
  color: var(--send-btn-active-fg);
  transform: translateY(-1px);
}

.stop-circle-btn {
  background-color: var(--danger);
  color: #ffffff;
}

.stop-circle-btn:hover {
  background-color: var(--danger-hover) !important;
  color: #ffffff !important;
}

/* Attached Expandable Prompt Tray */
.prompt-tray {
  border-top: 1px solid var(--border-subtle);
  background-color: rgba(0, 0, 0, 0.14);
  padding: 14px 22px 10px;
  max-height: 260px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  animation: fadeIn var(--transition-fast);
}

[data-theme="light"] .prompt-tray {
  background-color: rgba(16, 71, 160, 0.03);
}

.prompt-tray-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 8px;
}

.prompt-tray-title {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-dim);
}

.tray-close-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 5px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.tray-close-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-surface-hover);
}

.prompt-tray-list {
  display: flex;
  flex-direction: column;
}

.prompt-chip {
  width: 100%;
  background: transparent;
  border: none;
  border-top: 1px solid var(--border-subtle);
  padding: 13px 6px;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 15px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.prompt-chip:hover {
  color: var(--text-main);
  padding-left: 10px;
}

.prompt-chip strong {
  color: var(--text-main);
  font-weight: 600;
}

.prompt-chip-sub {
  font-size: 13.5px;
  color: var(--text-dim);
  flex-shrink: 0;
}

/* Category Selector Bar Below Composer */
.category-bar {
  margin-top: 22px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.category-pills {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  width: 100%;
}

.category-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-pill:hover,
.category-pill.active {
  background-color: var(--bg-surface-elevated);
  border-color: var(--accent-pill-border);
  color: var(--text-main);
}

.category-helper {
  font-size: 14px;
  color: var(--text-dim);
  text-align: center;
}

/* Chat Messages Styling */
.message-wrapper {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: fadeInUp var(--transition-normal);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.user-wrapper {
  align-self: flex-end;
  align-items: flex-end;
}

.assistant-wrapper {
  align-self: flex-start;
  align-items: flex-start;
  max-width: 92%;
}

.message-sender {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 6px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.message-content {
  font-size: 16.5px;
  line-height: 1.7;
  word-break: break-word;
  white-space: pre-wrap;
}

.user-wrapper .message-content {
  background-color: var(--user-bubble-bg);
  color: var(--text-main);
  border: 1px solid var(--user-bubble-border);
  padding: 13px 20px;
  border-radius: 20px 20px 4px 20px;
}

.assistant-wrapper .message-content {
  background-color: var(--assistant-bubble-bg);
  color: var(--text-main);
  padding: 4px 2px;
}

.streaming-cursor {
  display: inline-block;
  width: 8px;
  height: 17px;
  background-color: var(--accent-electric);
  vertical-align: text-bottom;
  margin-left: 4px;
  border-radius: 1px;
  animation: blink 0.8s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Message Action Toolbar (Copy, Edit Question, Thumbs Up/Down Feedback) */
.message-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

.message-wrapper:hover .message-actions {
  opacity: 1;
}

.msg-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.msg-action-btn svg {
  width: 15px;
  height: 15px;
}

.msg-action-btn:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
  color: var(--text-main);
}

.msg-action-btn.active {
  background-color: var(--accent-pill-bg);
  border-color: var(--accent-pill-border);
  color: var(--accent-brand);
}

.feedback-status {
  font-size: 12.5px;
  color: var(--text-dim);
  margin-left: 6px;
  animation: fadeIn var(--transition-fast);
}

/* Inline Question Editor */
.edit-container {
  width: 100%;
  min-width: min(520px, 84vw);
  background-color: var(--bg-composer);
  border: 1px solid var(--border-focus);
  border-radius: 16px;
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.edit-textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  resize: vertical;
  outline: none;
  min-height: 54px;
}

.edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.edit-btn {
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  padding: 7px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.edit-btn-cancel {
  background-color: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
}

.edit-btn-cancel:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-main);
}

.edit-btn-save {
  background-color: var(--accent-electric);
  border: 1px solid var(--accent-electric);
  color: #ffffff;
}

.edit-btn-save:hover {
  opacity: 0.92;
}

/* Footer Disclaimer and AI for Uganda Initiative Attribution */
.app-footer {
  padding: 12px 24px calc(32px + env(safe-area-inset-bottom, 0px));
  text-align: center;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-disclaimer {
  font-size: 13px;
  color: var(--text-dim);
}

.footer-attribution {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-attribution a {
  color: var(--accent-brand);
  text-decoration: none;
  font-weight: 500;
}

.footer-attribution a:hover {
  text-decoration: underline;
}

/* Mobile & PWA Responsive Adjustments */
@media (max-width: 680px) {
  .topbar {
    height: 54px;
    padding: 0 14px;
  }

  .brand-mark svg {
    width: 24px;
    height: 24px;
  }

  .brand-name {
    font-size: 16.5px;
  }

  .workspace {
    padding: 0 12px;
  }

  .welcome-hero {
    margin-bottom: 20px;
  }

  .hero-emblem svg {
    width: 34px;
    height: 34px;
  }

  .hero-heading {
    font-size: 26px;
  }

  .hero-subtitle {
    font-size: 14.5px;
    padding: 0 6px;
  }

  .composer-card {
    border-radius: 18px;
  }

  .composer-input-row {
    padding: 14px 16px 6px;
  }

  /* 16px prevents iOS Safari from auto-zooming on focus */
  .prompt-textarea {
    font-size: 16px;
    min-height: 44px;
    max-height: 120px;
  }

  .composer-toolbar {
    padding: 6px 12px 12px 14px;
    gap: 8px;
  }

  .tool-pill {
    padding: 6px 12px;
    font-size: 12.5px;
  }

  .send-circle-btn {
    width: 38px;
    height: 38px;
  }

  .category-bar {
    margin-top: 14px;
    gap: 10px;
  }

  .category-pills {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 2px 4px;
  }

  .category-pills::-webkit-scrollbar {
    display: none;
  }

  .category-pill {
    padding: 7px 14px;
    font-size: 12.5px;
    flex-shrink: 0;
  }

  .category-helper {
    font-size: 12px;
  }

  .prompt-chip {
    font-size: 13.5px;
    padding: 11px 4px;
  }

  .prompt-chip-sub {
    display: none;
  }

  .message-wrapper {
    max-width: 92%;
  }

  .message-content {
    font-size: 15px;
  }

  .app-footer {
    padding: 8px 12px calc(12px + env(safe-area-inset-bottom, 0px));
  }

  .footer-disclaimer,
  .footer-attribution {
    font-size: 11.5px;
  }
}