/* ==========================================================================
   STI Assist AI — interface styles
   Unofficial student prototype. No external fonts or assets are loaded.
   ========================================================================== */

:root {
  --navy-950: #07142e;
  --navy-900: #0b1c3d;
  --navy-800: #10264d;
  --blue-800: #123bb5;
  --blue-700: #1747d8;
  --blue-600: #1e5bff;
  --blue-500: #3e76ff;
  --blue-100: #e8efff;
  --blue-50: #f2f6ff;
  --gold-500: #f7b801;
  --gold-100: #fff4cc;
  --bg: #f4f7fc;
  --surface: #ffffff;
  --surface-2: #f8fafd;
  --surface-3: #eef3fa;
  --ink: #111b2e;
  --ink-2: #2a3750;
  --muted: #66748b;
  --muted-2: #8a97ab;
  --border: #e3e9f2;
  --border-strong: #cfd9e8;
  --success: #0d8a60;
  --success-bg: #e7f8f1;
  --warn: #9a6200;
  --warn-bg: #fff6df;
  --danger: #c1332f;
  --danger-bg: #fff0ef;
  --link: var(--blue-700);
  --link-hover: var(--blue-800);
  --accent: var(--blue-600);
  color-scheme: light;
  --shadow-xs: 0 1px 2px rgba(17, 27, 46, 0.04);
  --shadow-sm: 0 2px 8px rgba(20, 40, 80, 0.06);
  --shadow-md: 0 10px 30px rgba(15, 35, 75, 0.09);
  --shadow-lg: 0 24px 60px rgba(8, 21, 47, 0.22);
  --radius-sm: 9px;
  --radius-md: 13px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --sidebar-w: 298px;
  --font-sans: "Segoe UI Variable Text", "Segoe UI", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, "Liberation Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.modal-open {
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

img {
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

::selection {
  background: rgba(30, 91, 255, 0.18);
  color: var(--ink);
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 9px 13px;
  border-radius: 8px;
  background: var(--navy-900);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 0.15s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 2px solid var(--blue-600);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Shell
   -------------------------------------------------------------------------- */

.app-shell {
  display: flex;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
}

.main {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  height: 100%;
  background:
    radial-gradient(900px 420px at 78% -12%, rgba(30, 91, 255, 0.07), transparent 62%),
    var(--bg);
}

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */

.sidebar {
  position: relative;
  z-index: 30;
  display: flex;
  flex: 0 0 var(--sidebar-w);
  flex-direction: column;
  width: var(--sidebar-w);
  height: 100%;
  padding: 18px 15px 16px;
  overflow-y: auto;
  color: #dbe6f8;
  background:
    radial-gradient(380px 260px at 105% -6%, rgba(62, 118, 255, 0.36), transparent 68%),
    radial-gradient(300px 220px at -20% 108%, rgba(247, 184, 1, 0.12), transparent 70%),
    linear-gradient(172deg, #0c2046 0%, var(--navy-950) 100%);
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}

.sidebar::-webkit-scrollbar {
  width: 7px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.16);
  border-radius: 99px;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 4px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: #fff;
  text-align: left;
}

.brand-mark {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 11px;
  background: linear-gradient(150deg, #3474ff 0%, #1642ca 100%);
  box-shadow:
    inset 0 -3px 0 var(--gold-500),
    0 8px 22px rgba(30, 91, 255, 0.34);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}

.brand-text strong {
  overflow: hidden;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.015em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-text span {
  margin-top: 2px;
  overflow: hidden;
  color: #93a9ce;
  font-size: 11.5px;
  font-weight: 450;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-close {
  display: none;
  color: #b9c9e5;
}

.sidebar-close:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #fff;
}

.sidebar-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
  margin: 18px 4px 0;
  padding: 5px 9px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.055);
  color: #b9c9e5;
  font-size: 10.5px;
  font-weight: 550;
  letter-spacing: 0.01em;
}

.sidebar-badge .icon {
  width: 13px;
  height: 13px;
  color: #87a8e0;
}

.new-chat {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-top: 14px;
  padding: 11px 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.075);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    transform 0.15s ease;
}

.new-chat:hover {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.13);
}

.new-chat:active {
  transform: scale(0.99);
}

.new-chat .icon {
  width: 17px;
  height: 17px;
  color: #9fc0ff;
}

.sidebar-nav {
  margin-top: 6px;
}

.sidebar-label {
  margin: 20px 9px 8px;
  color: #7f96bb;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.suggestion-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.suggestion-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8.5px 9px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #c2d1e9;
  font-size: 12.8px;
  font-weight: 450;
  text-align: left;
  transition:
    background 0.13s ease,
    color 0.13s ease;
}

.suggestion-item:hover {
  background: rgba(255, 255, 255, 0.065);
  color: #fff;
}

.suggestion-item:active {
  background: rgba(255, 255, 255, 0.11);
}

.suggestion-item .icon {
  width: 15.5px;
  height: 15.5px;
  color: #7ea6f5;
}

.sidebar-spacer {
  flex: 1;
  min-height: 20px;
}

.handbook-card {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.045);
}

.handbook-icon {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 38px;
  place-items: center;
  border-radius: 8px;
  background: rgba(247, 184, 1, 0.12);
  color: #f3c648;
}

.handbook-icon .icon {
  width: 18px;
  height: 18px;
}

.handbook-title {
  margin: 0;
  color: #e9f1ff;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.35;
}

.handbook-meta {
  margin: 4px 0 0;
  color: #8ea5c9;
  font-size: 10.8px;
  line-height: 1.35;
}

.handbook-open {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 7px;
  color: #f3c648;
  font-size: 10.5px;
  font-weight: 600;
  text-decoration: none;
}

.handbook-open:hover {
  text-decoration: underline;
}

.handbook-open[hidden] {
  display: none;
}

.handbook-open .icon {
  width: 11px;
  height: 11px;
}

.sidebar-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 14px;
  padding: 12px 4px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.connection {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #a6b9d8;
  font-size: 10.8px;
  font-weight: 500;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted-2);
  box-shadow: 0 0 0 3px rgba(138, 151, 171, 0.15);
}

.connection .status-dot.is-demo,
.mode-pill.is-demo .status-dot {
  background: #f7b801;
  box-shadow: 0 0 0 3px rgba(247, 184, 1, 0.16);
}

.connection .status-dot.is-ai,
.mode-pill.is-ai .status-dot {
  background: #34d399;
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.16);
}

.connection .status-dot.is-offline,
.mode-pill.is-offline .status-dot {
  background: #f87171;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.16);
}

.text-btn {
  padding: 2px;
  border: 0;
  background: transparent;
  color: #8ea5c9;
  font-size: 10.8px;
  font-weight: 550;
}

.text-btn:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(5, 14, 32, 0.46);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

/* --------------------------------------------------------------------------
   Top bar
   -------------------------------------------------------------------------- */

.topbar {
  position: relative;
  z-index: 20;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  height: 68px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.topbar-title {
  min-width: 0;
}

.topbar-title h1 {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.022em;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-title p {
  margin: 2px 0 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 11.3px;
  letter-spacing: 0.005em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.mode-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5.5px 10px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 10.8px;
  font-weight: 600;
  white-space: nowrap;
}

.mode-pill.is-demo {
  border-color: #f1dfa8;
  background: #fffaeb;
  color: #7d5908;
}

.mode-pill.is-ai {
  border-color: #bfe9d9;
  background: #f0fbf6;
  color: #086b4b;
}

.mode-pill.is-offline {
  border-color: #f3c7c5;
  background: #fff4f3;
  color: #a12b27;
}

.mode-pill.is-loading .status-dot {
  animation: pulse 1.6s ease-in-out infinite;
}

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7.5px 10px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 11.8px;
  font-weight: 600;
  box-shadow: var(--shadow-xs);
  transition:
    border-color 0.13s ease,
    background 0.13s ease,
    color 0.13s ease;
}

.ghost-btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--ink);
}

.ghost-btn:disabled {
  border-color: var(--border);
  background: var(--surface);
  color: var(--muted-2);
  box-shadow: none;
  opacity: 0.55;
  cursor: not-allowed;
}

.ghost-btn:disabled .icon {
  color: var(--muted-2);
}

.ghost-btn .icon {
  width: 15px;
  height: 15px;
  color: var(--muted);
}

.icon-btn {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  transition:
    background 0.13s ease,
    color 0.13s ease;
}

.icon-btn:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.icon-btn.small {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.icon-btn.small .icon {
  width: 15px;
  height: 15px;
}

.theme-btn {
  border-radius: 10px;
}

.theme-btn .icon {
  width: 17px;
  height: 17px;
  transition: transform 0.2s ease;
}

.theme-btn:active .icon {
  transform: scale(0.9);
}

.menu-btn {
  display: none;
  margin-left: -6px;
}

/* Keep the sidebar's close control off desktop even though .icon-btn later
   sets display:inline-flex. */
.sidebar .sidebar-close {
  display: none;
}

.demo-banner {
  display: flex;
  flex: 0 0 auto;
  align-items: flex-start;
  gap: 9px;
  padding: 9px 24px;
  border-bottom: 1px solid #f0dfae;
  background: #fffaeb;
  color: #6f510a;
  font-size: 11.8px;
  line-height: 1.5;
}

.demo-banner .icon {
  width: 16px;
  height: 16px;
  margin-top: 1px;
  color: #b47a00;
}

.demo-banner p {
  margin: 0;
}

.demo-banner strong {
  font-weight: 650;
}

.demo-banner code {
  padding: 1px 4px;
  border-radius: 4px;
  background: rgba(154, 98, 0, 0.09);
  font-family: var(--font-mono);
  font-size: 10.8px;
}

/* --------------------------------------------------------------------------
   Welcome
   -------------------------------------------------------------------------- */

.chat-scroll {
  flex: 1;
  min-height: 0;
  padding: 32px 28px 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: #c8d4e6 transparent;
  scrollbar-gutter: stable;
}

.chat-scroll::-webkit-scrollbar {
  width: 10px;
}

.chat-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.chat-scroll::-webkit-scrollbar-thumb {
  border: 3px solid transparent;
  border-radius: 99px;
  background: #c8d4e6;
  background-clip: content-box;
}

.welcome {
  width: 100%;
  max-width: 856px;
  margin: 0 auto;
  padding: clamp(10px, 4vh, 52px) 0 24px;
  animation: rise-in 0.45s ease both;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 17px;
  color: var(--link);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(247, 184, 1, 0.16);
}

.welcome-head h2 {
  max-width: 720px;
  margin: 0;
  color: var(--navy-900);
  font-size: clamp(36px, 4.7vw, 56px);
  font-weight: 780;
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.welcome-head h2 span {
  background: linear-gradient(transparent 71%, rgba(247, 184, 1, 0.4) 71%);
  color: var(--navy-900);
}

.welcome-copy {
  max-width: 625px;
  margin: 19px 0 0;
  color: var(--muted);
  font-size: 14.8px;
  line-height: 1.68;
  letter-spacing: -0.004em;
  text-wrap: pretty;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 17px;
}

.trust-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 9px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
  font-size: 10.4px;
  font-weight: 600;
  letter-spacing: 0.005em;
  line-height: 1.35;
}

.trust-chip .icon {
  width: 12px;
  height: 12px;
  color: var(--link);
}

.trust-chip:nth-child(2) .icon {
  color: #9a6a00;
}

.trust-chip:nth-child(3) .icon {
  color: var(--success);
}

.start-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 11px;
  margin-top: 30px;
}

.start-card {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  min-height: 76px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  box-shadow: var(--shadow-xs);
  transition:
    transform 0.16s ease,
    border-color 0.16s ease,
    box-shadow 0.16s ease;
}

.start-card:hover {
  border-color: #b9cbf0;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.start-card:active {
  transform: translateY(0);
}

.start-icon {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  background: var(--blue-100);
  color: var(--link);
}

.start-icon .icon {
  width: 17px;
  height: 17px;
}

.start-card:nth-child(3n + 2) .start-icon {
  background: var(--gold-100);
  color: #8c6200;
}

.start-card:nth-child(3n) .start-icon {
  background: #e9f8f2;
  color: #087a56;
}

.start-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  padding-top: 1px;
}

.start-arrow {
  align-self: center;
  width: 13.5px;
  height: 13.5px;
  margin-left: 1px;
  color: var(--muted-2);
  opacity: 0;
  transform: translateX(-3px);
  transition:
    opacity 0.16s ease,
    transform 0.16s ease,
    color 0.16s ease;
}

.start-card:hover .start-arrow,
.start-card:focus-visible .start-arrow {
  color: var(--link);
  opacity: 1;
  transform: translateX(0);
}

@media (hover: none) {
  .start-arrow {
    opacity: 1;
    transform: none;
  }
}

.start-label {
  color: var(--ink);
  font-size: 12.8px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.start-question {
  display: -webkit-box;
  margin-top: 3px;
  overflow: hidden;
  color: var(--muted);
  font-size: 11.2px;
  line-height: 1.4;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.notice-card {
  display: flex;
  gap: 11px;
  margin-top: 25px;
  padding: 13px 15px;
  border: 1px solid #dce7fb;
  border-radius: 13px;
  background: rgba(238, 244, 255, 0.72);
  color: var(--ink-2);
}

.notice-card > .icon {
  width: 19px;
  height: 19px;
  margin-top: 1px;
  color: var(--link);
}

.notice-card strong {
  font-size: 12.2px;
  font-weight: 650;
}

.notice-card p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 11.7px;
  line-height: 1.58;
}

.noscript {
  padding: 14px;
  border: 1px solid #f0c9c7;
  border-radius: 10px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 13px;
}

/* --------------------------------------------------------------------------
   Messages
   -------------------------------------------------------------------------- */

.message-list {
  display: flex;
  flex-direction: column;
  gap: 26px;
  width: 100%;
  max-width: 856px;
  margin: 0 auto;
  padding: 4px 0 18px;
}

.message {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  width: 100%;
  animation: rise-in 0.32s ease both;
}

.message.no-anim {
  animation: none;
}

.message.user {
  justify-content: flex-end;
}

.avatar {
  display: grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  user-select: none;
}

.assistant-avatar {
  background: linear-gradient(150deg, #3474ff, #1642ca);
  color: #fff;
  box-shadow:
    inset 0 -2px 0 rgba(247, 184, 1, 0.85),
    0 4px 12px rgba(30, 91, 255, 0.22);
}

.assistant-avatar .icon {
  width: 18px;
  height: 18px;
}

.user-avatar {
  background: var(--navy-900);
  color: #e9f1ff;
  font-size: 9.5px;
  text-transform: uppercase;
}

.bubble-wrap {
  display: flex;
  flex-direction: column;
  min-width: 0;
  max-width: calc(100% - 46px);
}

.message.user .bubble-wrap {
  align-items: flex-end;
  max-width: min(80%, 660px);
}

.bubble {
  position: relative;
  min-width: 0;
  max-width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--border);
  border-radius: 4px 17px 17px 17px;
  background: var(--surface);
  color: var(--ink-2);
  box-shadow: var(--shadow-sm);
  font-size: 14.1px;
  line-height: 1.68;
  overflow-wrap: anywhere;
}

.message.user .bubble {
  border: 0;
  border-radius: 17px 4px 17px 17px;
  background: linear-gradient(150deg, var(--blue-600), var(--blue-700));
  color: #fff;
  box-shadow: 0 6px 18px rgba(30, 91, 255, 0.2);
}

.user-attachment {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 8px;
  padding: 4px 8px;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.16);
  color: #f2f7ff;
  font-size: 10.8px;
  font-weight: 600;
  line-height: 1.35;
}

.user-attachment .icon {
  width: 13px;
  height: 13px;
}

.message.assistant .bubble.is-safety {
  border-color: #f0cfcd;
  border-left: 3px solid #d45b56;
  background: #fffdfd;
}

.bubble.is-error {
  border-color: #f0cfcd;
  background: #fff8f7;
  color: #7a2522;
}

.bubble p {
  margin: 0 0 9px;
}

.bubble p:last-child {
  margin-bottom: 0;
}

.bubble.is-streaming > p:last-child::after {
  content: '';
  display: inline-block;
  width: 6px;
  height: 1.05em;
  margin-left: 3px;
  border-radius: 1px;
  background: var(--blue-600);
  vertical-align: -0.16em;
  animation: stream-caret 1s steps(2, start) infinite;
}

.bubble strong {
  color: var(--ink);
  font-weight: 650;
}

.message.user .bubble strong {
  color: #fff;
}

.bubble em {
  font-style: italic;
}

.bubble ul,
.bubble ol {
  margin: 7px 0 10px;
  padding-left: 22px;
}

.bubble li {
  margin: 3px 0;
  padding-left: 2px;
}

.bubble li::marker {
  color: var(--accent);
}

.message.user .bubble li::marker {
  color: rgba(255, 255, 255, 0.75);
}

.bubble blockquote {
  margin: 11px 0;
  padding: 8px 13px;
  border-left: 3px solid var(--gold-500);
  border-radius: 0 8px 8px 0;
  background: var(--surface-2);
  color: var(--ink-2);
  font-size: 13.1px;
  line-height: 1.65;
}

.bubble blockquote p {
  margin: 0 0 6px;
}

.bubble blockquote p:last-child {
  margin: 0;
}

.message.user .bubble blockquote {
  border-left-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.bubble code {
  padding: 1.5px 5px;
  border-radius: 5px;
  background: var(--surface-3);
  color: #1a3d7c;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.message.user .bubble code {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.bubble pre {
  max-width: 100%;
  margin: 10px 0;
  padding: 11px 13px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-2);
  font-size: 12.4px;
  line-height: 1.55;
}

.bubble pre code {
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
}

.bubble h3,
.bubble h4 {
  margin: 14px 0 6px;
  color: var(--ink);
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.35;
}

.bubble h3:first-child,
.bubble h4:first-child {
  margin-top: 0;
}

.bubble hr {
  height: 1px;
  margin: 13px 0;
  border: 0;
  background: var(--border);
}

.bubble a {
  color: var(--link);
  font-weight: 550;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.message.user .bubble a {
  color: #fff;
}

.bubble a:hover {
  color: var(--link-hover);
}

.message.user .bubble a:hover {
  color: #eaf1ff;
}

.message-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 7px;
  padding: 0 2px;
  color: var(--muted-2);
  font-size: 10.5px;
}

.message.user .message-meta {
  justify-content: flex-end;
}

.meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 7px;
  border-radius: 99px;
  font-size: 9.7px;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.meta-tag .icon {
  width: 11px;
  height: 11px;
}

.meta-tag.ai {
  border: 1px solid #c4e9dc;
  background: var(--success-bg);
  color: #08714f;
}

.meta-tag.demo {
  border: 1px solid #f1dfa8;
  background: #fffaeb;
  color: #7d5908;
}

.meta-tag.safety {
  border: 1px solid #f0cfcd;
  background: var(--danger-bg);
  color: #a12b27;
}

.meta-tag.guide {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
}

.meta-actions {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin-left: 2px;
}

.meta-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted-2);
  font-size: 10.3px;
  font-weight: 550;
}

.meta-btn:hover {
  background: var(--surface-2);
  color: var(--ink-2);
}

.meta-btn .icon {
  width: 12.5px;
  height: 12.5px;
}

.sources-block {
  margin-top: 12px;
}

.sources-title {
  display: flex;
  align-items: center;
  gap: 5px;
  margin: 0 0 7px;
  color: var(--muted);
  font-size: 10.2px;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.sources-title .icon {
  width: 12px;
  height: 12px;
}

.source-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.source-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fcfdff;
  transition:
    border-color 0.13s ease,
    box-shadow 0.13s ease;
}

.source-card:hover {
  border-color: #cbd9ef;
  box-shadow: var(--shadow-xs);
}

.source-card[open] {
  border-color: #c9d8f2;
  background: var(--surface);
}

.source-card summary {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 11px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.source-card summary::-webkit-details-marker {
  display: none;
}

.source-card summary:hover {
  background: var(--blue-50);
}

.source-card[open] summary {
  border-bottom: 1px solid var(--border);
}

.source-index {
  display: grid;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  place-items: center;
  border-radius: 6px;
  background: var(--blue-100);
  color: var(--link);
  font-size: 9.7px;
  font-weight: 700;
}

.source-main {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
}

.source-name {
  overflow: hidden;
  color: var(--ink);
  font-size: 12.2px;
  font-weight: 600;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-chapter {
  margin-top: 1px;
  overflow: hidden;
  color: var(--muted);
  font-size: 10.6px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-page {
  flex: 0 0 auto;
  padding: 3px 7px;
  border-radius: 99px;
  background: var(--blue-50);
  color: var(--link);
  font-size: 10.1px;
  font-weight: 650;
  white-space: nowrap;
}

.source-chevron {
  width: 13px;
  height: 13px;
  color: var(--muted-2);
  transition: transform 0.2s ease;
}

.source-card[open] .source-chevron {
  transform: rotate(180deg);
}

.source-excerpt {
  max-height: 250px;
  padding: 11px 13px 12px;
  overflow-y: auto;
  scrollbar-gutter: stable;
  color: var(--ink-2);
  font-size: 12.1px;
  line-height: 1.68;
  white-space: pre-wrap;
}

.source-excerpt::-webkit-scrollbar {
  width: 8px;
}

.source-excerpt::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 99px;
  background: #cfdaea;
  background-clip: content-box;
}

.source-excerpt-text {
  white-space: pre-wrap;
}

.source-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 12px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.source-foot-note {
  color: var(--muted);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.075em;
  text-transform: uppercase;
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--link);
  font-size: 10.7px;
  font-weight: 650;
  text-decoration: none;
  white-space: normal;
}

.source-link:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.source-link .icon {
  width: 12px;
  height: 12px;
}

.warning-box {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  margin-top: 9px;
  padding: 9px 11px;
  border: 1px solid #f1ddae;
  border-radius: 9px;
  background: var(--warn-bg);
  color: #71500d;
  font-size: 11.2px;
  line-height: 1.5;
}

.warning-box .icon {
  width: 14px;
  height: 14px;
  margin-top: 1px;
  color: #a37008;
}

.image-card {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 9px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 10.8px;
}

.image-card .icon {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.image-card strong {
  color: var(--ink-2);
  font-weight: 600;
}

/* Typing */

.typing-row {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  width: 100%;
  max-width: 856px;
  margin: 0 auto;
  padding: 0 0 18px;
  animation: rise-in 0.25s ease both;
}

.typing-bubble {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 4px 16px 16px 16px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.typing-bubble > span:not(.typing-text) {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #9fb0c9;
  animation: typing 1.25s ease-in-out infinite;
}

.typing-bubble > span:nth-child(2) {
  animation-delay: 0.14s;
}

.typing-bubble > span:nth-child(3) {
  animation-delay: 0.28s;
}

.typing-text {
  margin-left: 5px;
  color: var(--muted);
  font-size: 11px;
}

/* --------------------------------------------------------------------------
   Composer
   -------------------------------------------------------------------------- */

.composer-wrap {
  position: relative;
  flex: 0 0 auto;
  padding: 7px 24px calc(11px + env(safe-area-inset-bottom));
  background: linear-gradient(to bottom, rgba(244, 247, 252, 0), var(--bg) 26%);
}

.jump-latest {
  position: absolute;
  z-index: 6;
  bottom: calc(100% + 8px);
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 99px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 11.4px;
  font-weight: 650;
  box-shadow:
    0 2px 6px rgba(15, 35, 75, 0.1),
    0 10px 26px rgba(15, 35, 75, 0.18);
  transform: translateX(-50%);
  animation: jump-latest-in 0.18s ease both;
  transition:
    border-color 0.13s ease,
    background 0.13s ease,
    color 0.13s ease;
}

.jump-latest:hover {
  border-color: #b9cbf0;
  background: var(--blue-50);
  color: var(--link);
}

.jump-latest .icon {
  width: 13px;
  height: 13px;
  color: var(--link);
}

.composer {
  width: 100%;
  max-width: 856px;
  margin: 0 auto;
  padding: 8px 9px 7px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow:
    0 1px 2px rgba(17, 27, 46, 0.03),
    0 10px 34px rgba(15, 35, 75, 0.075);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.composer:focus-within {
  border-color: #9db8f5;
  box-shadow:
    0 0 0 4px rgba(30, 91, 255, 0.09),
    0 10px 34px rgba(15, 35, 75, 0.08);
}

.composer.is-busy {
  border-color: #c7d6ef;
}

.composer.is-dragging {
  border-color: var(--blue-500);
  background: var(--blue-50);
  box-shadow:
    0 0 0 4px rgba(30, 91, 255, 0.1),
    0 10px 34px rgba(15, 35, 75, 0.08);
}

.attachment-preview {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 7px;
  padding: 6px 6px 9px;
  border-bottom: 1px solid var(--border);
}

.attachment-thumb-wrap {
  position: relative;
  flex: 0 0 58px;
  width: 58px;
  height: 48px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--surface-3);
}

.attachment-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.upload-progress {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: rgba(17, 27, 46, 0.18);
}

.upload-progress-bar {
  width: 0;
  height: 100%;
  background: var(--gold-500);
  transition: width 0.15s linear;
}

.attachment-info {
  flex: 1;
  min-width: 0;
}

.attachment-name {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-size: 11.8px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-status {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 10.6px;
}

.attachment-status.is-ready {
  color: var(--success);
}

.attachment-status.is-error {
  color: var(--danger);
}

.composer-row {
  display: flex;
  align-items: flex-end;
  gap: 5px;
}

.attach-btn {
  margin-bottom: 1px;
}

.message-input {
  flex: 1;
  min-width: 0;
  min-height: 38px;
  max-height: 164px;
  padding: 8px 5px 7px;
  overflow-y: auto;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--ink);
  font-size: 14.3px;
  line-height: 1.55;
  resize: none;
  scrollbar-width: thin;
}

.message-input::placeholder {
  color: #8b98ad;
}

.send-btn {
  display: grid;
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  margin-bottom: 1px;
  place-items: center;
  border: 0;
  border-radius: 11px;
  background: linear-gradient(150deg, var(--blue-600), var(--blue-700));
  color: #fff;
  box-shadow: 0 4px 12px rgba(30, 91, 255, 0.24);
  transition:
    background 0.14s ease,
    box-shadow 0.14s ease,
    transform 0.14s ease,
    opacity 0.14s ease;
}

.send-btn:hover:not(:disabled) {
  background: linear-gradient(150deg, #2d68ff, var(--blue-800));
  box-shadow: 0 6px 16px rgba(30, 91, 255, 0.3);
}

.send-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.send-btn:disabled {
  background: #e3e9f4;
  box-shadow: none;
  color: #a0aec5;
}

.send-btn .icon {
  width: 17px;
  height: 17px;
  margin: 1px 1px 0 0;
}

.send-btn.is-busy .icon {
  animation: spin 1s linear infinite;
}

.composer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 6px 0;
  color: var(--muted);
  font-size: 10.6px;
}

.composer-hint {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

kbd {
  display: inline-block;
  min-width: 16px;
  padding: 1px 4px;
  border: 1px solid var(--border);
  border-bottom-color: #d2dae8;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
}

.char-count {
  flex: 0 0 auto;
  font-variant-numeric: tabular-nums;
}

.char-count.is-near {
  color: #b26b00;
  font-weight: 600;
}

.char-count.is-over {
  color: var(--danger);
  font-weight: 600;
}

.footer-note {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 5px;
  max-width: 856px;
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 10.2px;
  line-height: 1.45;
  text-align: center;
  text-wrap: pretty;
}

.footer-note > span {
  min-width: 0;
}

.footer-note .icon {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  margin-top: 2px;
}

.inline-link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--link);
  font-size: inherit;
  font-weight: 600;
}

.inline-link:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Modal
   -------------------------------------------------------------------------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(6, 17, 38, 0.54);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: fade-in 0.18s ease both;
}

.modal {
  display: flex;
  flex-direction: column;
  width: min(570px, 100%);
  max-height: min(82dvh, 740px);
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  animation: pop-in 0.2s ease both;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 19px;
  border-bottom: 1px solid var(--border);
}

.modal-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.modal-body {
  padding: 17px 20px;
  overflow-y: auto;
  color: var(--ink-2);
  font-size: 12.8px;
  line-height: 1.66;
}

.modal-body h3 {
  margin: 20px 0 6px;
  color: var(--ink);
  font-size: 12.3px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p {
  margin: 0 0 10px;
}

.modal-body ul {
  margin: 6px 0 12px;
  padding-left: 20px;
}

.modal-body li {
  margin: 4px 0;
}

.modal-body strong {
  color: var(--ink);
  font-weight: 650;
}

.modal-body code {
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--surface-3);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.modal-body a {
  color: var(--link);
  font-weight: 600;
}

.modal-body .modal-callout {
  margin: 12px 0;
  padding: 10px 12px;
  border: 1px solid #dce7fb;
  border-radius: 9px;
  background: var(--blue-50);
  color: var(--ink-2);
  font-size: 12px;
}

.modal-foot {
  display: flex;
  justify-content: flex-end;
  padding: 12px 19px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.primary-btn {
  padding: 8px 15px;
  border: 0;
  border-radius: 8px;
  background: var(--blue-600);
  color: #fff;
  font-size: 12.3px;
  font-weight: 600;
  box-shadow: 0 3px 10px rgba(30, 91, 255, 0.22);
}

.primary-btn:hover {
  background: var(--blue-700);
}

.danger-btn {
  background: #c33a35;
  box-shadow: 0 3px 10px rgba(195, 58, 53, 0.2);
}

.danger-btn:hover {
  background: #a92f2b;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 4px;
}

.secondary-btn {
  padding: 8px 15px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 12.3px;
  font-weight: 600;
}

.secondary-btn:hover {
  background: var(--surface-2);
}

/* --------------------------------------------------------------------------
   Toasts
   -------------------------------------------------------------------------- */

.toast-region {
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom));
  z-index: 220;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(340px, calc(100vw - 32px));
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 10px;
  background: var(--navy-900);
  color: #eaf1ff;
  box-shadow: 0 10px 30px rgba(8, 21, 47, 0.28);
  font-size: 11.7px;
  line-height: 1.45;
  animation: toast-in 0.22s ease both;
  pointer-events: auto;
}

.toast .icon {
  width: 15px;
  height: 15px;
  margin-top: 1px;
  color: #9fc0ff;
}

.toast.is-error {
  border-color: rgba(255, 255, 255, 0.12);
  background: #7a2522;
}

.toast.is-error .icon {
  color: #ffd1cf;
}

.toast.is-success .icon {
  color: #6ee7b7;
}

.toast.is-leaving {
  animation: toast-out 0.2s ease both;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1200px) {
  .start-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 960px) {
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(316px, 88vw);
    transform: translateX(-104%);
    transition: transform 0.24s cubic-bezier(0.22, 0.8, 0.3, 1);
    box-shadow: 18px 0 50px rgba(4, 12, 28, 0.28);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-close {
    display: inline-flex;
  }

  .sidebar .sidebar-close {
    display: inline-flex;
  }

  .menu-btn {
    display: inline-flex;
  }

  .topbar {
    padding: 0 16px;
  }

  .demo-banner {
    padding-right: 16px;
    padding-left: 16px;
  }

  .chat-scroll {
    padding: 24px 18px 20px;
  }

  .composer-wrap {
    padding: 6px 14px calc(9px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 760px) {
  .start-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .welcome-head h2 {
    font-size: clamp(34px, 8vw, 46px);
  }

  .topbar {
    height: 62px;
  }

  .topbar-title h1 {
    font-size: 14.8px;
  }

  .topbar-title p {
    font-size: 10.5px;
  }

  .chat-scroll {
    padding: 20px 14px 16px;
  }

  .message-list {
    gap: 22px;
  }

  .bubble {
    padding: 12px 14px;
    font-size: 13.7px;
  }

  .message.user .bubble-wrap {
    max-width: 88%;
  }

  .avatar {
    flex-basis: 30px;
    width: 30px;
    height: 30px;
    border-radius: 9px;
  }

  .bubble-wrap {
    max-width: calc(100% - 41px);
  }

  .composer-meta .composer-hint {
    display: none;
  }

  .composer-meta {
    justify-content: flex-end;
  }

  .toast-region {
    right: 16px;
    bottom: calc(16px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 560px) {
  .topbar-actions .ghost-btn span {
    display: none;
  }

  .topbar-actions .ghost-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    justify-content: center;
  }

  .mode-pill {
    padding: 5px 8px;
    font-size: 9.9px;
  }

  .welcome {
    padding-top: 4px;
  }

  .welcome-copy {
    margin-top: 15px;
    font-size: 13.4px;
    line-height: 1.62;
  }

  .trust-row {
    gap: 6px;
    margin-top: 12px;
  }

  .trust-chip {
    gap: 4px;
    padding: 4px 8px;
    font-size: 9.8px;
  }

  .start-grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    margin: 18px -14px 0;
    padding: 2px 14px 6px;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-padding-inline: 14px;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
  }

  .start-grid::-webkit-scrollbar {
    display: none;
  }

  .start-card {
    flex: 0 0 min(76vw, 248px);
    min-height: 64px;
    padding: 10px;
    gap: 8px;
    scroll-snap-align: start;
  }

  .start-icon {
    flex-basis: 29px;
    width: 29px;
    height: 29px;
    border-radius: 8px;
  }

  .start-icon .icon {
    width: 15px;
    height: 15px;
  }

  .start-label {
    font-size: 11.6px;
  }

  .start-question {
    display: -webkit-box;
    margin-top: 2px;
    font-size: 10.5px;
    -webkit-line-clamp: 2;
  }

  .start-arrow {
    opacity: 1;
    transform: none;
  }

  .notice-card {
    margin-top: 18px;
    padding: 11px 12px;
  }

  .notice-card p {
    font-size: 11.3px;
  }

  .footer-note {
    font-size: 9.8px;
  }

  .footer-note .icon {
    display: none;
  }

  .message.user .bubble-wrap {
    max-width: 92%;
  }

  .meta-btn {
    padding: 6px 8px;
    font-size: 10.6px;
  }

  .meta-btn .icon {
    width: 13.5px;
    height: 13.5px;
  }

  .source-name {
    white-space: normal;
  }

  .sources-block {
    margin-top: 10px;
  }

  .source-excerpt {
    max-height: 200px;
  }

  .demo-banner {
    font-size: 10.9px;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .composer {
    border-radius: 16px;
  }

  .modal {
    max-height: 88dvh;
  }

  .modal-body {
    padding: 15px 16px;
  }
}

@media (max-width: 390px) {
  .mode-pill {
    width: auto;
    height: 28px;
    padding: 0 9px;
    gap: 5px;
    font-size: 9.9px;
  }

  .mode-pill span:last-child {
    display: none;
  }

  .mode-pill::after {
    content: attr(data-short);
    font-weight: 650;
  }

  .topbar-actions {
    gap: 4px;
  }
}

/* --------------------------------------------------------------------------
   Theme menu
   -------------------------------------------------------------------------- */

.theme-control {
  position: relative;
}

.theme-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 150px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  animation: pop-in 0.14s ease both;
}

.theme-menu button {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 9px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-2);
  font-size: 12.6px;
  font-weight: 550;
  text-align: left;
}

.theme-menu button:hover {
  background: var(--surface-2);
}

.theme-menu button[aria-checked="true"] {
  background: var(--blue-50);
  color: var(--link);
  font-weight: 650;
}

.theme-menu .icon {
  width: 15px;
  height: 15px;
  color: var(--muted);
}

.theme-menu button[aria-checked="true"] .icon {
  color: var(--link);
}

/* --------------------------------------------------------------------------
   Sidebar table of contents
   -------------------------------------------------------------------------- */

.toc {
  margin-top: 18px;
}

.toc-summary {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0 9px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.toc-summary::-webkit-details-marker {
  display: none;
}

.toc-summary .icon:first-child {
  width: 14px;
  height: 14px;
  color: #7ea6f5;
}

.toc-summary span {
  flex: 1;
}

.toc-chevron {
  width: 12.5px;
  height: 12.5px;
  color: #7f96bb;
  transition: transform 0.2s ease;
}

.toc[open] .toc-chevron {
  transform: rotate(180deg);
}

.toc-body {
  max-height: 264px;
  margin: 8px 4px 2px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}

.toc-hint {
  margin: 4px 5px;
  color: #8ea5c9;
  font-size: 11px;
}

.toc-chapter {
  margin: 9px 7px 3px;
  color: #9fb4d6;
  font-size: 10.2px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #c2d1e9;
  font-size: 12px;
  font-weight: 450;
  text-align: left;
  text-decoration: none;
}

.toc-item:hover {
  background: rgba(255, 255, 255, 0.065);
  color: #fff;
}

.toc-page {
  margin-left: auto;
  color: #8ea5c9;
  font-size: 10.4px;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Index freshness notice
   -------------------------------------------------------------------------- */

.index-notice {
  display: flex;
  flex: 0 0 auto;
  align-items: flex-start;
  gap: 9px;
  padding: 9px 24px;
  border-bottom: 1px solid #f0cfcd;
  background: var(--danger-bg);
  color: #7a2522;
  font-size: 11.8px;
  line-height: 1.5;
}

.index-notice .icon {
  width: 16px;
  height: 16px;
  margin-top: 1px;
  color: var(--danger);
}

.index-notice p {
  margin: 0;
}

/* --------------------------------------------------------------------------
   Quick actions (command palette)
   -------------------------------------------------------------------------- */

.palette-backdrop {
  position: fixed;
  inset: 0;
  z-index: 260;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px 16px;
  background: rgba(6, 17, 38, 0.46);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  animation: fade-in 0.15s ease both;
}

.palette {
  width: min(560px, 100%);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  animation: pop-in 0.18s ease both;
}

.palette-input {
  width: 100%;
  padding: 14px 16px;
  border: 0;
  border-bottom: 1px solid var(--border);
  outline: none;
  background: transparent;
  color: var(--ink);
  font-size: 14.5px;
}

.palette-input::placeholder {
  color: var(--muted-2);
}

.palette-list {
  max-height: min(46vh, 380px);
  margin: 0;
  padding: 6px;
  overflow-y: auto;
  list-style: none;
}

.palette-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--ink-2);
  font-size: 13px;
  text-align: left;
}

.palette-item .icon {
  width: 15px;
  height: 15px;
  color: var(--muted);
}

.palette-item .palette-kind {
  margin-left: auto;
  padding: 2px 7px;
  border-radius: 99px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 9.6px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.palette-item.is-active {
  background: var(--blue-50);
  color: var(--ink);
}

.palette-item.is-active .icon {
  color: var(--link);
}

.palette-empty {
  padding: 16px;
  color: var(--muted);
  font-size: 12.5px;
  text-align: center;
}

.palette-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 9px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted-2);
  font-size: 10.4px;
}

/* --------------------------------------------------------------------------
   Composer extras: handbook-only toggle, dictation
   -------------------------------------------------------------------------- */

.mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 10.2px;
  font-weight: 600;
  transition:
    border-color 0.13s ease,
    background 0.13s ease,
    color 0.13s ease;
}

.mode-toggle:hover {
  border-color: var(--border-strong);
  color: var(--ink-2);
}

.mode-toggle[aria-pressed="true"] {
  border-color: #f1dfa8;
  background: #fffaeb;
  color: #7d5908;
}

.mode-toggle .icon {
  width: 12px;
  height: 12px;
}

.mic-btn {
  margin-bottom: 1px;
}

.mic-btn.is-recording {
  background: var(--danger-bg);
  color: var(--danger);
  animation: pulse 1.2s ease-in-out infinite;
}

/* --------------------------------------------------------------------------
   Answer extras: follow-ups, citation links, feedback, skeleton
   -------------------------------------------------------------------------- */

.follow-ups {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 11px;
}

.follow-up {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 11.6px;
  font-weight: 600;
  box-shadow: var(--shadow-xs);
  transition:
    border-color 0.13s ease,
    background 0.13s ease,
    color 0.13s ease;
}

.follow-up:hover {
  border-color: #b9cbf0;
  background: var(--blue-50);
  color: var(--link);
}

.follow-up .icon {
  width: 12.5px;
  height: 12.5px;
  color: var(--link);
}

.cite-link {
  display: inline;
  padding: 0 2px;
  border: 0;
  border-radius: 4px;
  background: var(--blue-50);
  color: var(--link);
  font: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
}

.cite-link:hover {
  background: var(--blue-100);
}

.source-card.is-highlighted {
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(62, 118, 255, 0.18);
}

.source-excerpt mark {
  padding: 0 1px;
  border-radius: 3px;
  background: rgba(247, 184, 1, 0.32);
  color: inherit;
}

.meta-btn.is-voted {
  background: var(--blue-50);
  color: var(--link);
}

.sources-skeleton {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  max-width: 856px;
  margin: 0 auto;
  padding: 0 0 18px;
}

.skeleton-row {
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 37%, var(--surface-2) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}

.skeleton-row.is-short {
  width: 70%;
}

/* --------------------------------------------------------------------------
   Dark theme
   Follows the system preference by default; the header toggle persists an
   explicit choice in localStorage.
   -------------------------------------------------------------------------- */

:root[data-theme="dark"] {
  color-scheme: dark;
  --navy-900: #0b1c3d;
  --bg: #0a1120;
  --surface: #121a2c;
  --surface-2: #17223a;
  --surface-3: #1e2b47;
  --ink: #e9effa;
  --ink-2: #bcc9e0;
  --muted: #93a2bd;
  --muted-2: #75859f;
  --border: #24314f;
  --border-strong: #35476b;
  --blue-50: #15223c;
  --blue-100: #1c2d52;
  --gold-100: #3a2f12;
  --success: #35d39a;
  --success-bg: #102d26;
  --warn: #e8b64b;
  --warn-bg: #33280f;
  --danger: #f0837e;
  --danger-bg: #3a1d1d;
  --link: #8db3ff;
  --link-hover: #b3ccff;
  --accent: #6f9bff;
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.62);
}

:root[data-theme="dark"] .main {
  background:
    radial-gradient(900px 420px at 78% -12%, rgba(62, 118, 255, 0.13), transparent 62%),
    var(--bg);
}

:root[data-theme="dark"] .topbar {
  background: rgba(13, 20, 35, 0.82);
}

:root[data-theme="dark"] .topbar-title h1 {
  color: var(--ink);
}

/* Welcome */

:root[data-theme="dark"] .welcome-head h2,
:root[data-theme="dark"] .welcome-head h2 span {
  color: var(--ink);
}

:root[data-theme="dark"] .welcome-head h2 span {
  background: linear-gradient(transparent 71%, rgba(247, 184, 1, 0.28) 71%);
}

:root[data-theme="dark"] .trust-chip {
  background: rgba(255, 255, 255, 0.045);
}

:root[data-theme="dark"] .trust-chip:nth-child(2) .icon {
  color: #e8b64b;
}

:root[data-theme="dark"] .start-card:hover {
  border-color: #3d5480;
}

:root[data-theme="dark"] .start-card:nth-child(3n + 2) .start-icon {
  color: #e8b64b;
}

:root[data-theme="dark"] .start-card:nth-child(3n) .start-icon {
  background: #12362b;
  color: #4bd6a1;
}

:root[data-theme="dark"] .notice-card {
  border-color: #293c62;
  background: rgba(30, 50, 92, 0.42);
}

/* Banners and status pills */

:root[data-theme="dark"] .demo-banner {
  border-bottom-color: #4a3a15;
  background: #2c230c;
  color: #e9c987;
}

:root[data-theme="dark"] .demo-banner .icon {
  color: #e8b64b;
}

:root[data-theme="dark"] .mode-pill.is-demo {
  border-color: #4a3a15;
  background: #2c230c;
  color: #e9c987;
}

:root[data-theme="dark"] .mode-pill.is-ai {
  border-color: #1f4a3c;
  background: #0f2c24;
  color: #6fdcae;
}

:root[data-theme="dark"] .mode-pill.is-offline {
  border-color: #5a2c2c;
  background: #331616;
  color: #f0a19d;
}

/* Messages */

:root[data-theme="dark"] .bubble {
  border-color: var(--border);
}

:root[data-theme="dark"] .bubble code {
  color: #9cc0ff;
}

:root[data-theme="dark"] .message.assistant .bubble.is-safety {
  border-color: #55292a;
  background: #1f1418;
}

:root[data-theme="dark"] .bubble.is-error {
  border-color: #55292a;
  background: #221417;
  color: #f3aaa6;
}

:root[data-theme="dark"] .typing-bubble > span:not(.typing-text) {
  background: #56658a;
}

:root[data-theme="dark"] .meta-tag.ai {
  border-color: #1f4a3c;
  color: #6fdcae;
}

:root[data-theme="dark"] .meta-tag.demo {
  border-color: #4a3a15;
  background: #2c230c;
  color: #e9c987;
}

:root[data-theme="dark"] .meta-tag.safety {
  border-color: #55292a;
  color: #f0a19d;
}

/* Sources */

:root[data-theme="dark"] .source-card {
  background: #101828;
}

:root[data-theme="dark"] .source-card[open] {
  border-color: #33456b;
  background: var(--surface);
}

:root[data-theme="dark"] .source-card:hover {
  border-color: #33456b;
}

:root[data-theme="dark"] .source-excerpt::-webkit-scrollbar-thumb {
  background: #35476b;
  background-clip: content-box;
}

:root[data-theme="dark"] .warning-box {
  border-color: #4a3a15;
  color: #e9c987;
}

:root[data-theme="dark"] .warning-box .icon {
  color: #e8b64b;
}

/* Chat scrollbars */

:root[data-theme="dark"] .chat-scroll {
  scrollbar-color: #33456b transparent;
}

:root[data-theme="dark"] .chat-scroll::-webkit-scrollbar-thumb {
  background: #33456b;
  background-clip: content-box;
}

/* Composer */

:root[data-theme="dark"] .composer-wrap {
  background: linear-gradient(to bottom, rgba(10, 17, 32, 0), var(--bg) 26%);
}

:root[data-theme="dark"] .composer {
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.4),
    0 10px 34px rgba(0, 0, 0, 0.45);
}

:root[data-theme="dark"] .composer:focus-within {
  border-color: #3d5480;
  box-shadow:
    0 0 0 4px rgba(62, 118, 255, 0.16),
    0 10px 34px rgba(0, 0, 0, 0.45);
}

:root[data-theme="dark"] .composer.is-busy {
  border-color: #35476b;
}

:root[data-theme="dark"] .send-btn:disabled {
  background: #1d2942;
  color: #5d6c8a;
}

:root[data-theme="dark"] .message-input::placeholder {
  color: #66748f;
}

:root[data-theme="dark"] kbd {
  border-bottom-color: var(--border-strong);
}

:root[data-theme="dark"] .jump-latest {
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.4),
    0 10px 26px rgba(0, 0, 0, 0.5);
}

/* Modal */

:root[data-theme="dark"] .modal-backdrop {
  background: rgba(2, 6, 15, 0.66);
}

:root[data-theme="dark"] .modal-body .modal-callout {
  border-color: #293c62;
}

/* New components */

:root[data-theme="dark"] .palette-backdrop {
  background: rgba(2, 6, 15, 0.66);
}

:root[data-theme="dark"] .index-notice {
  border-bottom-color: #55292a;
  background: #221417;
  color: #f3aaa6;
}

:root[data-theme="dark"] .index-notice .icon {
  color: #f0837e;
}

:root[data-theme="dark"] .mode-toggle[aria-pressed="true"] {
  border-color: #4a3a15;
  background: #2c230c;
  color: #e9c987;
}

:root[data-theme="dark"] .skeleton-row {
  background: linear-gradient(90deg, #17223a 25%, #1e2b47 37%, #17223a 63%);
  background-size: 400% 100%;
}

/* Sidebar keeps its navy identity in both themes */

:root[data-theme="dark"] .sidebar {
  border-right-color: rgba(255, 255, 255, 0.1);
}

/* --------------------------------------------------------------------------
   Motion
   -------------------------------------------------------------------------- */

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pop-in {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes jump-latest-in {
  from {
    opacity: 0;
    transform: translate(-50%, 8px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

@keyframes typing {
  0%,
  60%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  30% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes stream-caret {
  50% {
    opacity: 0;
  }
}

@keyframes shimmer {
  from {
    background-position: 100% 0;
  }
  to {
    background-position: 0 0;
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   Mobile keyboard
   The client mirrors visualViewport.height into --app-height so the composer
   stays visible when the on-screen keyboard opens.
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .app-shell {
    height: var(--app-height, 100dvh);
  }
}

/* --------------------------------------------------------------------------
   Print
   One clean column of answers and citations; no chrome, no controls.
   -------------------------------------------------------------------------- */

@media print {
  .sidebar,
  .topbar,
  .demo-banner,
  .index-notice,
  .composer-wrap,
  .typing-row,
  .sources-skeleton,
  .jump-latest,
  .toast-region,
  .message-meta,
  .follow-ups,
  .meta-actions,
  .source-chevron,
  .sidebar-overlay,
  .palette-backdrop,
  .modal-backdrop,
  .skip-link {
    display: none !important;
  }

  .app-shell,
  .main,
  .chat-scroll {
    display: block;
    height: auto;
    overflow: visible;
    background: #fff;
  }

  .chat-scroll {
    padding: 0;
  }

  .message-list {
    gap: 18px;
    padding: 0;
  }

  .bubble {
    border-color: #cccccc;
    box-shadow: none;
  }

  .message.user .bubble {
    color: #000;
    background: #eef2f8;
    box-shadow: none;
  }

  .message.user .bubble strong,
  .message.user .bubble a {
    color: #000;
  }

  .source-card,
  .source-excerpt,
  .notice-card {
    break-inside: avoid;
  }

  .welcome {
    padding: 0;
  }
}