/* Chat-specific presentation. Shared tokens, themes, and print styles live in style.css. */
:root {
  --sidebar-w: 264px;
  --chat-width: 800px;
}

/* A quieter shell leaves room for the conversation. */
.main {
  background: var(--bg);
}

.sidebar {
  padding: 24px 16px 18px;
}

.sidebar > * {
  flex-shrink: 0;
}

.sidebar-badge {
  margin-top: 20px;
  border: 0;
  padding: 0 4px;
  background: transparent;
  color: #a8bddf;
}

.home-link {
  margin: 14px 0 0;
  padding: 10px 8px;
  border-radius: 9px;
}

.new-chat {
  justify-content: center;
  min-height: 46px;
  margin-top: 14px;
  border-color: transparent;
  background: var(--gold-500);
  color: var(--navy-950);
  box-shadow: 0 4px 16px #00000012;
}

.new-chat .icon {
  color: inherit;
}

.new-chat:hover {
  border-color: transparent;
  background: #ffca31;
}

.sidebar-label {
  color: #9eb3d3;
  letter-spacing: 0.11em;
}

.suggestion-item {
  min-height: 40px;
  font-size: 13px;
}

.toc-summary {
  min-height: 40px;
  margin-inline: 4px;
  letter-spacing: 0.065em;
}

.handbook-card {
  padding: 12px 10px;
}

.sidebar-foot {
  align-items: flex-start;
  flex-direction: column;
  gap: 12px;
}

.sidebar-foot .text-btn {
  min-height: 30px;
  color: #a8bddf;
  font-size: 11px;
}

.topbar {
  height: 76px;
  gap: 12px;
  padding-inline: 28px;
}

.topbar-title {
  display: grid;
  grid-template-columns: minmax(0, 1fr) max-content;
  align-items: center;
  gap: 3px 10px;
}

.topbar-title h1 {
  font-size: 16px;
  font-weight: 700;
}

.topbar-title p {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 11px;
}

.topbar-title .mode-pill {
  justify-self: start;
  padding: 3px 8px;
  font-size: 10px;
}

.topbar-actions {
  flex: 0 0 auto;
  gap: 4px;
}

.topbar .icon-btn,
.topbar .ghost-btn {
  min-width: 40px;
  min-height: 40px;
}

.topbar .ghost-btn {
  margin-left: 5px;
  border-color: transparent;
  background: transparent;
  box-shadow: none;
}

.chat-scroll {
  padding: 28px 30px;
  scroll-padding-block: 24px;
  scrollbar-gutter: stable both-edges;
}

/* Four readable starters, with the full set a click away. */
.welcome {
  max-width: 720px;
  padding: clamp(8px, 3vh, 32px) 0 8px;
}

.welcome-head {
  text-align: center;
}

.welcome-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  margin: 0 auto 22px;
  border: 1px solid #ffffff30;
  border-radius: 19px;
  background: linear-gradient(145deg, #3474ff, #1747d8);
  color: #fff;
  box-shadow: 0 8px 24px #1e5bff24;
  transform: rotate(-5deg);
}

.welcome-mark > .icon {
  width: 29px;
  height: 29px;
  transform: rotate(5deg);
}

.welcome-mark > span {
  position: absolute;
  right: -9px;
  bottom: -5px;
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  border: 3px solid var(--bg);
  border-radius: 50%;
  background: var(--gold-500);
  color: var(--navy-950);
}

.welcome-mark > span .icon {
  width: 13px;
  height: 13px;
}

.eyebrow {
  gap: 9px;
  margin-bottom: 13px;
  font-size: 10px;
  letter-spacing: 0.13em;
}

.welcome-head h2 {
  font-size: clamp(32px, 3.3vw, 44px);
  font-weight: 720;
  line-height: 1.15;
  letter-spacing: -0.045em;
}

.welcome-head h2 span {
  background: none;
  color: var(--link);
}

.welcome-copy {
  max-width: 450px;
  margin: 16px auto 0;
  font-size: 14px;
  line-height: 1.7;
}

.trust-row {
  justify-content: center;
  gap: 14px;
  margin-top: 16px;
}

.trust-chip {
  gap: 5px;
  padding: 0;
  border: 0;
  background: transparent;
  font-size: 11px;
  font-weight: 450;
}

.starter-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 32px;
}

.starter-heading h3 {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 550;
}

.topics-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 5px;
  min-height: 36px;
  padding: 4px 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--link);
  font-size: 12px;
  font-weight: 600;
}

.topics-toggle .icon {
  width: 13px;
  height: 13px;
  transition: transform 180ms ease;
}

.topics-toggle[aria-expanded="true"] .icon {
  transform: rotate(180deg);
}

.topics-toggle:hover {
  background: var(--blue-100);
}

.start-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 7px 0 0;
  padding: 0;
  overflow: visible;
}

.start-card {
  align-items: center;
  gap: 12px;
  min-height: 88px;
  padding: 15px;
  border-radius: 14px;
  box-shadow: none;
}

.start-icon {
  flex-basis: 36px;
  width: 36px;
  height: 36px;
}

.start-label {
  font-size: 13px;
  font-weight: 650;
}

.start-question {
  display: block;
  margin-top: 4px;
  overflow: visible;
  font-size: 12px;
  line-height: 1.45;
}

.start-arrow {
  opacity: 0.65;
  transform: none;
}

.notice-card {
  align-items: flex-start;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
  padding: 0 12px;
  border: 0;
  background: transparent;
}

.notice-card > .icon {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  color: var(--muted);
}

.notice-card strong {
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
}

.notice-card p {
  margin-top: 2px;
  font-size: 11px;
  line-height: 1.55;
}

/* Conversation typography and sources use the same readable measure. */
.message-list,
.typing-row,
.composer {
  max-width: var(--chat-width);
}

.message-list {
  gap: 28px;
}

.message-speaker {
  margin: 0 0 8px 2px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 650;
}

.message .avatar {
  margin-top: 0;
}

.message.user .avatar {
  display: none;
}

.message.user .bubble-wrap {
  max-width: min(85%, 640px);
}

.message.user .bubble {
  border-radius: 18px 5px 18px 18px;
  box-shadow: none;
}

.bubble {
  padding: 18px 20px;
  border-radius: 5px 18px 18px;
  box-shadow: var(--shadow-xs);
  font-size: 15px;
  line-height: 1.8;
}

.bubble p {
  margin-bottom: 12px;
}

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

.bubble h3,
.bubble h4 {
  margin-top: 20px;
  font-size: 16px;
}

.bubble blockquote {
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.8;
}

.bubble li {
  margin-block: 6px;
}

.message-meta {
  gap: 8px 12px;
  margin-top: 12px;
  font-size: 11px;
}

.meta-actions {
  flex-wrap: wrap;
}

.meta-btn {
  min-height: 36px;
  padding-inline: 8px;
  font-size: 11px;
}

.sources-title {
  margin-block: 16px 9px;
  font-size: 11px;
}

.source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 8px;
}

.source-card {
  min-width: 0;
  border-radius: 12px;
}

.source-card[open] {
  grid-column: 1 / -1;
}

.source-card summary {
  min-height: 68px;
  padding: 12px;
  gap: 8px;
}

.source-name {
  font-size: 12px;
  white-space: normal;
}

.source-chapter {
  font-size: 10px;
}

.source-page {
  padding: 4px 6px;
  font-size: 10px;
}

.source-excerpt {
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.8;
}

.follow-ups {
  gap: 8px;
  margin-top: 14px;
}

.follow-up {
  min-height: 36px;
  padding: 7px 11px;
  font-size: 12px;
  white-space: normal;
  text-align: left;
}

/* Stable, comfortable input on both mouse and touch screens. */
.composer-wrap {
  padding: 12px 30px calc(14px + env(safe-area-inset-bottom));
}

.composer {
  padding: 12px 12px 9px;
  border-radius: 20px;
}

.composer-row {
  gap: 8px;
}

.message-input {
  min-height: 44px;
  padding: 10px 5px;
  font-size: 16px;
  line-height: 1.5;
}

.composer-row .icon-btn,
.send-btn {
  flex-basis: 44px;
  width: 44px;
  height: 44px;
}

.send-btn {
  border-radius: 13px;
}

.send-btn .icon {
  width: 19px;
  height: 19px;
}

.composer-meta {
  gap: 8px;
  margin-top: 8px;
  padding: 8px 4px 0;
  border-top: 1px solid var(--border);
  font-size: 10px;
}

.composer-hint {
  flex-wrap: wrap;
  gap: 4px;
}

.mode-toggle {
  min-height: 30px;
}

.char-count {
  margin-left: auto;
}

.footer-note {
  max-width: var(--chat-width);
  margin: 10px auto 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.6;
}

.jump-latest {
  min-height: 40px;
  font-size: 12px;
}

.modal {
  border-radius: 20px;
}

.modal-head,
.modal-foot {
  padding: 18px 24px;
}

.modal-body {
  padding: 20px 24px;
  font-size: 14px;
  line-height: 1.75;
}

.modal .primary-btn,
.modal .ghost-btn {
  min-height: 44px;
}

.theme-menu button {
  min-height: 40px;
}

.toast-region {
  top: 88px;
  bottom: auto;
}

:where(.icon-btn, .ghost-btn, .topics-toggle, .meta-btn, .follow-up, .home-link) {
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

:where(.icon-btn, .ghost-btn, .topics-toggle, .meta-btn, .follow-up):active:not(:disabled) {
  transform: scale(0.96);
}

.sidebar :focus-visible {
  outline-color: var(--gold-500);
}

:root[data-theme="dark"] .welcome-head h2 span {
  background: none;
  color: var(--link);
}

:root[data-theme="dark"] .trust-chip,
:root[data-theme="dark"] .notice-card {
  background: transparent;
}

@media (max-width: 1100px) {
  .source-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .sidebar {
    visibility: hidden;
    transition: transform 240ms ease, visibility 0s linear 240ms;
  }

  .sidebar.is-open {
    visibility: visible;
    transition-delay: 0s;
  }

  .topbar {
    padding-inline: 18px;
  }

  .chat-scroll {
    padding-inline: 24px;
  }

  .composer-wrap {
    padding-inline: 24px;
  }

  .sidebar .sidebar-close {
    min-width: 40px;
    min-height: 40px;
  }
}

@media (max-width: 600px) {
  .topbar {
    height: 68px;
    padding-inline: 12px;
    gap: 8px;
  }

  .topbar-title {
    gap: 4px 7px;
  }

  .topbar-title h1 {
    font-size: 14px;
  }

  .topbar-title .mode-pill {
    width: 16px;
    height: 16px;
    padding: 0;
    justify-content: center;
    border: 0;
    background: transparent;
  }

  .topbar-title .mode-pill span:last-child,
  .topbar-title .mode-pill::after {
    display: none;
  }

  .topbar-title p {
    font-size: 10px;
  }

  .topbar-actions {
    gap: 0;
  }

  .topbar .ghost-btn {
    width: 40px;
    padding: 0;
    margin-left: 0;
    justify-content: center;
  }

  .topbar .ghost-btn span {
    display: none;
  }

  .chat-scroll {
    padding: 22px 16px 20px;
    scrollbar-gutter: auto;
  }

  .welcome {
    padding-top: 0;
  }

  .welcome-mark {
    width: 44px;
    height: 44px;
    margin-bottom: 14px;
    border-radius: 16px;
  }

  .welcome-head h2 {
    font-size: 32px;
  }

  .eyebrow {
    font-size: 9px;
    margin-bottom: 10px;
  }

  .welcome-copy {
    max-width: 330px;
    margin-top: 12px;
    font-size: 13px;
  }

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

  .trust-chip {
    font-size: 10px;
  }

  .starter-heading {
    margin-top: 16px;
    gap: 4px;
  }

  .starter-heading h3,
  .topics-toggle {
    font-size: 11px;
  }

  .start-grid {
    gap: 8px;
  }

  .start-card {
    position: relative;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    min-height: 134px;
    padding: 12px;
  }

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

  .start-arrow {
    position: absolute;
    top: 20px;
    right: 12px;
  }

  .start-label {
    font-size: 12px;
  }

  .start-question {
    font-size: 11px;
  }

  .notice-card {
    margin-top: 18px;
    padding: 0 2px;
  }

  .message {
    gap: 8px;
  }

  .message.assistant {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .message.assistant .avatar {
    z-index: 1;
    grid-area: 1 / 1;
    width: 26px;
    height: 26px;
    border-radius: 8px;
  }

  .message.assistant .avatar .icon {
    width: 15px;
    height: 15px;
  }

  .message.assistant .bubble-wrap {
    grid-area: 1 / 1 / 2 / -1;
    max-width: 100%;
  }

  .message.assistant .message-speaker {
    min-height: 28px;
    margin: 0 0 10px 36px;
    line-height: 26px;
  }

  .bubble {
    padding: 15px;
    font-size: 15px;
    line-height: 1.75;
  }

  .message.user .bubble-wrap {
    max-width: 90%;
  }

  .source-list {
    grid-template-columns: 1fr;
  }

  .source-card summary {
    min-height: 64px;
  }

  .composer-wrap {
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
  }

  .composer {
    padding: 8px;
    border-radius: 18px;
  }

  .composer-row {
    gap: 3px;
  }

  .composer-meta {
    margin-top: 4px;
    padding-top: 5px;
  }

  .footer-note {
    margin-top: 7px;
    font-size: 10px;
  }

  .toast-region {
    top: 78px;
    right: 12px;
    max-width: calc(100vw - 24px);
  }

  .modal-head,
  .modal-body,
  .modal-foot {
    padding: 16px;
  }
}

@media (max-height: 740px) and (min-width: 601px) {
  .chat-scroll {
    padding-block: 18px;
  }

  .welcome {
    padding-top: 0;
  }

  .welcome-mark {
    display: none;
  }

  .welcome-head h2 {
    font-size: 34px;
  }

  .welcome-copy,
  .trust-row {
    margin-top: 10px;
  }

  .starter-heading {
    margin-top: 16px;
  }

  .start-card {
    min-height: 72px;
    padding-block: 11px;
  }

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

@media (max-height: 740px) and (max-width: 600px) {
  .welcome-mark {
    display: none;
  }
}