/* A conversation: centred column, glass user bubbles, unboxed answers. */

.page-chat {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
}

.chat-scroll {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  /* A symmetric gutter whether or not the thread overflows: the column stays
     centred on the docked composer and never shifts sideways. */
  scrollbar-gutter: stable both-edges;
  /* Tabbing to a link in an answer brings it clear of the faded edges. */
  scroll-padding: 20px 0 72px;
  -webkit-overflow-scrolling: touch;
  /* Content dissolves into the canvas just above the docked composer. */
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 14px, #000 calc(100% - 56px), transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 14px, #000 calc(100% - 56px), transparent 100%);
}

.chat-col {
  width: 100%;
  max-width: calc(var(--chat-w) + 56px);
  margin: 0 auto;
  padding: 12px 28px 56px;
}

.earlier { width: auto; margin: 0 auto 12px; text-align: center; }

.transcript { display: flex; flex-direction: column; }

/* ----------------------------------------------------------- Day separator */

.day-separator {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0 8px;
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.day-separator::before, .day-separator::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), var(--hairline-2), rgba(255, 255, 255, 0));
}
.transcript > .day-separator:first-child { margin-top: 4px; }

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

/* Pair rhythm: a question sits close to its answer, and exchanges are spaced apart. */
.message { margin: 0; }
.transcript > .message:first-child { margin-top: 16px; }
.transcript > * + .message { margin-top: 24px; }
.message-user + .message-assistant { margin-top: 16px; }
.message-assistant + .message-user { margin-top: 40px; }
.day-separator + .message { margin-top: 16px; }
.message.is-new { animation: rise var(--slow) var(--ease) both; }

.message-user {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.message-user .message-body {
  max-width: min(82%, 600px);
  padding: 12px 16px;
  border-radius: 20px 20px 6px 20px;
  border: 1px solid var(--hairline-2);
  /* No backdrop blur: inside the masked scroller there is nothing behind it to
     sample, and the filter pass would still run on every scroll frame. */
  background: linear-gradient(180deg, rgba(255, 255, 255, .09) 0%, rgba(255, 255, 255, .055) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08), var(--shadow-1);
  color: var(--text-1);
  font-size: 15px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message-note {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-2);
}

.message-assistant {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  column-gap: 16px;
}
.message-assistant .orb-avatar { margin-top: 1px; }
.message-main { min-width: 0; }

/* Only the newest (or a pending) answer's orb is alive. A long thread would
   otherwise run four animations, two of them blurred, per answer. */
.message-assistant .orb-avatar,
.message-assistant .orb-avatar span,
.message-assistant .orb-avatar .orb-swirl::before { animation-play-state: paused; }
.transcript > .message-assistant:last-child .orb-avatar,
.transcript > .message-assistant:last-child .orb-avatar span,
.transcript > .message-assistant:last-child .orb-avatar .orb-swirl::before,
.message-assistant.is-pending .orb-avatar,
.message-assistant.is-pending .orb-avatar span,
.message-assistant.is-pending .orb-avatar .orb-swirl::before { animation-play-state: running; }

/* ------------------------------------------------------------ Answer type */

.answer {
  font-size: 16px;
  line-height: 1.68;
  color: var(--text-1);
  overflow-wrap: anywhere;
}
.answer:empty { display: none; }
.answer > :first-child { margin-top: 0; }
.answer > :last-child { margin-bottom: 0; }
.answer p { margin: 0 0 .9em; }
.answer strong { font-weight: var(--fw-semibold); color: #fff; }
.answer em { font-style: italic; color: var(--text-1); }
/* Answers use `###` sub-headings, which render as h4: that is the level that has
   to read as a heading, clearly apart from a bold lead-in. */
.answer h3, .answer h4 {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  letter-spacing: -.015em;
  color: #fff;
}
.answer h3 { margin: 28px 0 8px; font-size: 20px; line-height: 1.3; }
.answer h4 { margin: 24px 0 8px; font-size: 17px; line-height: 1.35; }
.answer ul, .answer ol { margin: 0 0 1em; padding-left: 1.35em; }
.answer li { margin: .32em 0; padding-left: .2em; }
.answer li::marker { color: var(--text-3); }
.answer ol > li::marker { font-variant-numeric: tabular-nums; font-weight: var(--fw-semibold); }
.answer li > ul, .answer li > ol { margin: .3em 0 .2em; }
.answer blockquote {
  margin: 0 0 1em;
  padding: 10px 16px;
  border-left: 2px solid var(--hairline-3);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(255, 255, 255, .03);
  color: var(--text-2);
}
.answer blockquote > :last-child { margin-bottom: 0; }
.answer hr {
  margin: 1.6em 0;
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), var(--hairline-3), rgba(255, 255, 255, 0));
}
.answer code {
  padding: .1em .4em;
  border-radius: var(--r-xs);
  border: 1px solid var(--hairline);
  background: rgba(255, 255, 255, .06);
  font-family: var(--mono);
  font-size: .87em;
}
.answer pre {
  margin: 0 0 1em;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--hairline);
  background: rgba(0, 0, 0, .35);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .04);
  overflow-x: auto;
  scrollbar-width: thin;
  line-height: 1.55;
}
.answer pre code { padding: 0; border: 0; background: none; font-size: 13px; white-space: pre; }
.answer a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: rgba(184, 173, 255, .45);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--fast) var(--ease), color var(--fast) var(--ease);
}
.answer a:hover { color: #d2caff; text-decoration-color: currentColor; }
/* Where a labelled link really goes, when the label doesn't already say. */
.answer a .link-host { color: var(--text-3); font-size: .9em; overflow-wrap: anywhere; }

/* -------------------------------------------------------------- Thinking */

.message-status { padding-top: 3px; }

.thinking {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 26px;
}
.thinking-label {
  font-size: 15px;
  font-weight: var(--fw-regular);
  color: var(--text-2);
  background: linear-gradient(90deg, var(--text-3) 0%, var(--text-3) 35%, #ffffff 50%, var(--text-3) 65%, var(--text-3) 100%);
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: text-shimmer 2.2s linear infinite;
}
.thinking-time { font-size: 12px; color: var(--text-3); }
.thinking-note {
  max-width: 52ch;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-2);
  animation: rise var(--slow) var(--ease) both;
}

@media (prefers-reduced-motion: reduce) {
  .thinking-label { animation: none; background: none; -webkit-text-fill-color: currentColor; color: var(--text-2); }
}

/* ---------------------------------------------------------------- Actions */

.message-actions {
  display: flex;
  gap: 2px;
  margin: 10px 0 0 -8px;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.message-assistant:hover .message-actions,
.message-assistant:focus-within .message-actions,
.transcript > .message-assistant:last-child .message-actions { opacity: 1; }

.act {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 10px 0 8px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: none;
  color: var(--text-3);
  font-size: 13px;
  font-weight: var(--fw-regular);
  cursor: pointer;
  transition: background-color var(--fast) var(--ease), color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.act:hover:not(:disabled) { background: rgba(255, 255, 255, .06); color: var(--text-1); }
.act.is-done { color: var(--ok); }
.act[aria-pressed="true"] { color: var(--text-2); border-color: var(--hairline); cursor: default; }
.act:disabled { cursor: default; }

@media (hover: none) {
  .message-actions { opacity: 1; }
  .act { height: 44px; }
}

/* ------------------------------------------------------------------ Cards */

.card {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-radius: var(--r-card);
  border: 1px solid var(--hairline-2);
  background: linear-gradient(180deg, rgba(255, 255, 255, .055), rgba(255, 255, 255, .025));
  box-shadow: var(--top-light), var(--shadow-1);
  animation: rise var(--slow) var(--ease) both;
}
.card-ico { margin-top: 2px; color: var(--text-2); }
.card-main { flex: 1; min-width: 0; }
.card-title { margin-bottom: 4px; font-size: 14px; font-weight: var(--fw-semibold); color: var(--text-1); }
.card-text { font-size: 14px; line-height: 1.6; color: var(--text-2); overflow-wrap: anywhere; }
.card-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
/* Cards live inside .answer, whose paragraph margins must not reach them. */
.answer .card p { margin: 0; }
.answer .card .card-title { margin-bottom: 4px; }
.answer .card .card-actions { margin-top: 12px; }
.btn-countdown:empty { display: none; }
.card.is-problem { border-color: var(--danger-line); background: linear-gradient(180deg, rgba(255, 110, 125, .09), rgba(255, 110, 125, .03)); }
.card.is-problem .card-ico { color: var(--danger); }

/* --------------------------------------------------------------- Skeleton */

.chat-skeleton { padding-top: 26px; }
.skel-bubble { width: 46%; height: 42px; margin-left: auto; border-radius: 20px 20px 6px 20px; }
.skel-answer { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 16px; margin-top: 28px; }
.skel-dot { width: 28px; height: 28px; border-radius: 50%; }
.skel-lines { display: flex; flex-direction: column; gap: 12px; padding-top: 6px; }
.skel-line { height: 12px; }
.skel-short { width: 58%; }

/* -------------------------------------------------------------------- Dock */

.dock {
  position: relative;
  z-index: 3;
  /* Clear of the home indicator and, in landscape, the notch side. */
  padding: 0 max(28px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) 28px;
}
.dock-inner { max-width: var(--chat-w); margin: 0 auto; }

.usage-note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 6px 10px;
  font-size: 13px;
  color: var(--text-2);
}
.usage-ico { width: 16px; height: 16px; color: var(--warn); }

.jump-pill {
  /* Absolutely placed in grid row 1, so it floats just above the dock. */
  position: absolute;
  grid-row: 1;
  left: 50%;
  bottom: 16px;
  z-index: 4;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 14px 0 10px;
  border-radius: 999px;
  border: 1px solid var(--hairline-2);
  background: rgba(22, 23, 32, .88);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  box-shadow: var(--top-light), var(--shadow-2);
  color: var(--text-1);
  font-size: 13px;
  font-weight: var(--fw-semibold);
  cursor: pointer;
  transform: translateX(-50%);
  animation: fade-in var(--dur) var(--ease) both;
}
.jump-pill:hover { background: rgba(32, 33, 44, .95); }
.page-chat { position: relative; }

@media (max-width: 767.98px) {
  .chat-col { padding: 8px max(16px, env(safe-area-inset-right)) 32px max(16px, env(safe-area-inset-left)); }
  .message-user .message-body { max-width: 88%; }
  .message-assistant { column-gap: 12px; grid-template-columns: 24px minmax(0, 1fr); }
  .message-assistant .orb-avatar { --orb: 24px; }
  .dock { padding: 0 max(10px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left)); }
  .jump-pill { height: 44px; padding: 0 16px 0 12px; }
}