/**
 * @file conversation-pane.css
 * @author Jouni Miikki
 * SPDX-License-Identifier: MIT
 * @description The messenger's frame (components/ConversationPane.js): the two panes, the open pane's
 *   column and head, the "replying to" bar, the read-only line, the compose fields, a scrolling part
 *   and a strip across the pane; on a phone one pane at a time with the way back, and the open one
 *   over the whole screen. Reads only the tokens in theme.css and the shapes in poster.css; a page
 *   never styles it from outside.
 * @usage Linked from public/spa.html in the component block.
 * @version-history
 *   v1.1.0 — 2026-09-27 — The framed panes (Panes framed): panes.css folded in under this sheet's names,
 *     with its values; nothing the messenger draws changed.
 *   v1.0.1 — 2026-09-26 — The reply bar's left edge reads var(--shape-frame-heavy) (3px in AIMEAT), not
 *     a literal (check:shape-tokens; fix pass).
 *   v1.0.0 — 2026-09-26 — Initial, moved with their values from css/views/inbox.css and
 *     inbox-poster.css (see ConversationPane.js).
 */

/* ── The two panes, their own scroll. The height is MEASURED (use-thread-ux.js publishes
   --conversation-desk-avail); the old guess stays as the first paint's fallback. ── */
.conversation-panes {
  display: grid;
  grid-template-columns: minmax(260px, 340px) 1fr;
  height: var(--conversation-desk-avail, calc(100vh - 300px));
  min-height: 320px;
  overflow: hidden;
  background: transparent;
}
.conversation-panes-side {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border-right: var(--shape-frame-heavy) solid var(--shape-rule-colour);
}
/* The way back: on a phone only. */
.conversation-panes-back {
  display: none;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 11px 12px;
  border: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--card-bg);
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}

/* ── The open pane's column. min-height:0 lets it keep to the panes' height instead of growing to
   fit a long thread. The pane's width decides what its head shows (a container query). ── */
.conversation-pane { display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; container-type: inline-size; container-name: thread; }
.conversation-pane--empty { align-items: center; justify-content: center; }
.conversation-pane-empty { text-align: center; color: var(--text-dim); font-weight: 600; display: flex; flex-direction: column; align-items: center; gap: 8px; }
/* A page's column: its height follows its words, and the page head already says what the pane's
   head would. */
.conversation-pane--page { height: auto; }
.conversation-pane--page > .conversation-head { display: none; }
.conversation-pane--page .conversation-fields { padding: 0 0 .8rem; }

/* ── The head: who and what on ONE line on a computer (the address is the name's tooltip); the
   name never shrinks, the subject gives way. ── */
.conversation-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: .6rem 1rem;
  border-bottom: var(--shape-frame-heavy) solid var(--shape-rule-colour);
  flex: none;
}
.conversation-head-id { min-width: 0; flex: 1; display: flex; align-items: baseline; gap: 8px; }
.conversation-head-id > * { min-width: 0; }
.conversation-head-name { flex: 0 0 auto; font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conversation-head-subject { flex: 1 1 auto; font-family: var(--font-mono); font-size: 12px; color: var(--accent); margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conversation-head-via { flex: none; font-size: 12px; color: var(--text-dim); margin-top: 1px; white-space: nowrap; }
/* The address: in the page for anyone who needs it, out of the conversation's way. */
.conversation-head-address { display: none; font-size: 11px; color: var(--text-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conversation-head-door { flex: none; white-space: nowrap; }
.conversation-head-mark { font-size: 13px; line-height: 1; margin-right: 5px; }
/* The ways on answer to the pane, not the window: a wide window can hold a narrow pane. */
@container thread (max-width: 620px) {
  .conversation-head-word { display: none; }
  .conversation-head-mark { margin-right: 0; }
  .conversation-head { gap: 6px; padding: 8px 10px; }
}
@container thread (max-width: 430px) {
  .conversation-head-id .conversation-head-subject { display: none; }
}

/* ── Over and in the composer's place ── */
.conversation-fields { padding: 12px 12px 0; }
.conversation-replybar {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border-top: 1px solid var(--border-subtle);
  background: var(--card-bg-alt);
}
.conversation-replybar-main {
  flex: 1; min-width: 0; text-align: left; cursor: pointer;
  border: none; border-left: var(--shape-frame-heavy) solid var(--accent);
  background: transparent; padding: 2px 0 2px 8px;
  font: inherit; color: inherit;
}
.conversation-replybar-label { display: block; font-size: 11px; font-weight: 600; color: var(--accent); }
.conversation-replybar-text {
  display: block; font-size: 12px; color: var(--text-dim);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.conversation-pane-note {
  border-top: 1px solid var(--border-subtle);
  padding: 12px 16px; color: var(--text-dim); font-size: 13px; text-align: center;
}

/* ── A scrolling part and a strip across the pane ── */
.conversation-pane-scroll { flex: 1; min-height: 0; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.conversation-strip { display: flex; flex-direction: column; gap: 8px; padding: 8px 12px; border-top: 1px solid var(--border-subtle); }
.conversation-strip--grey { padding: 10px 12px; background: var(--card-bg-alt); }

/* ── A phone: one pane at a time, the way back over the open one, the open one over the whole screen
   (the app's bar, menu and crumb are covered; the way back closes it). ── */
@media (max-width: 760px) {
  .conversation-panes { grid-template-columns: 1fr; height: var(--conversation-desk-avail, calc(100dvh - 168px)); min-height: 240px; }
  .conversation-panes-side { border-right: none; }
  .conversation-panes:not(.conversation-panes--open) > .conversation-pane { display: none; }
  .conversation-panes:not(.conversation-panes--open) > .conversation-panes-side { height: 100%; }
  .conversation-panes--open { grid-template-rows: auto minmax(0, 1fr); position: fixed; inset: 0; z-index: 1000; margin: 0; border-top: 0;
    height: var(--conversation-avail, 100dvh); background: var(--bg, var(--card-bg)); }
  .conversation-panes--open > .conversation-panes-side { display: none; }
  .conversation-panes--open > .conversation-panes-back { display: inline-flex; }
  body:has(.conversation-panes--open) { overflow: clip; }
  body:has(.conversation-panes--open) .topnav { display: none; }
  .conversation-head { padding: 10px 12px; gap: 8px; flex-wrap: wrap; row-gap: 2px; }
  .conversation-fields { padding: 10px 10px 0; }
  .conversation-head-word { display: none; }
  /* The head's id column flattens into the head's line, and the subject, "via" and the address take
     full lines under it (the subject at most two), so a long subject never eats half the screen. */
  .conversation-head .conversation-head-id { display: contents; }
  .conversation-head .conversation-head-name { flex: 1 1 0; min-width: 0; }
  .conversation-head .conversation-head-subject,
  .conversation-head .conversation-head-via,
  .conversation-head .conversation-head-address { display: block; order: 1; flex: 0 0 100%; min-width: 0; margin-top: 0; }
  .conversation-head .conversation-head-subject {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}

/* ── Panes framed: a long list beside the one thing opened from it, on a page, in one frame; the
   list's head stays, its rows scroll, the opened thing scrolls on its own. Values from
   admin-prompts.css (.adm-pr-bench, .adm-pr-list, .adm-pr-rows, .adm-pr-editor) by way of panes.css. ── */
.conversation-panes-framed {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  border: var(--shape-frame) solid var(--shape-frame-colour);
  border-radius: var(--shape-corner);
  background: var(--card-bg);
}
.conversation-panes-framed-list {
  min-width: 0;
  display: flex;
  flex-direction: column;
  max-height: 78vh;
  border-right: var(--shape-frame) solid var(--shape-frame-colour);
}
.conversation-panes-framed-head { padding: 6px 10px 0; }
.conversation-panes-framed-rows { overflow-y: auto; padding: 0 10px 10px; }
.conversation-panes-framed-open { min-width: 0; max-height: 78vh; overflow-y: auto; padding: 12px 16px 16px; }

/* One column under a wide desktop: the opened thing needs the width more than the list needs to stay
   beside it (at 1280 two panes leave a prompt's text about sixty characters a line). */
@media (max-width: 1400px) {
  .conversation-panes-framed { grid-template-columns: minmax(0, 1fr); }
  .conversation-panes-framed-list { max-height: 420px; border-right: 0; border-bottom: var(--shape-frame) solid var(--shape-frame-colour); }
  .conversation-panes-framed-open { max-height: none; }
}