/* Light only — no dark-mode variants by design. */
:root {
  --bg: #f2f3f6;
  --panel: #ffffff;
  --ink: #14161b;
  --muted: #6d7480;
  --faint: #99a0ac;
  --line: #e4e7ec;
  --accent: #2f6bff;
  --accent-soft: #eaf0ff;
  --in-bg: #eef0f4;
  --out-bg: #2f6bff;
  --out-ink: #ffffff;
  --code-bg: #f7f8fa;
  --code-ink: #2b303a;
  --warn-bg: #fff6e6;
  --warn-ink: #7a4d00;
  --err-bg: #fdeded;
  --err-ink: #a02121;
  --shadow: 0 1px 2px rgba(20, 22, 27, 0.05), 0 6px 20px rgba(20, 22, 27, 0.05);
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- chrome ---------- */

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 22px 20px 10px;
}
.topbar h1 { margin: 0; font-size: 19px; letter-spacing: -0.015em; }
.topbar__sub { margin: 3px 0 0; color: var(--muted); font-size: 13px; }

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 6px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel--thread { min-height: 60vh; }

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.panel__head h2 {
  margin: 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
}
.panel__head--thread { flex-wrap: wrap; }
.thread-id { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.thread-id strong { font-size: 14px; }
.panel__actions { display: flex; gap: 6px; }
.stat { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }

textarea {
  border: 0;
  min-height: 200px;
  max-height: 42vh;
  padding: 12px 14px;
  resize: vertical;
  background: transparent;
  color: var(--ink);
  font: 12px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
textarea:focus { outline: 2px solid var(--accent); outline-offset: -2px; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  background: #fbfbfd;
}

.btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn--primary:hover { background: #2559dd; border-color: #2559dd; color: #fff; }
.btn--sm { padding: 4px 9px; font-size: 12px; }
.btn--file { display: inline-flex; align-items: center; }

.toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }

.tabs { display: flex; gap: 3px; }
.tab {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 13px;
  cursor: pointer;
}
.tab:hover { color: var(--ink); }
.tab.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.status {
  margin: 12px 14px 0;
  padding: 8px 11px;
  border-radius: 8px;
  font-size: 13px;
  background: var(--warn-bg);
  color: var(--warn-ink);
  white-space: pre-wrap;
}
.status--error { background: var(--err-bg); color: var(--err-ink); }

.view { overflow: auto; padding: 16px 14px 22px; flex: 1; }

/* ---------- thread ---------- */

.thread {
  display: flex;
  flex-direction: column;
  gap: 3px;
  max-width: 720px;
  margin: 0 auto;
}

.day { display: flex; justify-content: center; margin: 18px 0 12px; }
.day:first-child { margin-top: 2px; }
.day__pill {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--in-bg);
  border-radius: 999px;
  padding: 4px 12px;
}

.turn { display: flex; flex-direction: column; }
.turn--run-start { margin-top: 12px; }
.turn--in { align-items: flex-start; }
.turn--out { align-items: flex-end; }

.turn__sender {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0 4px 3px;
}

.line { display: flex; align-items: flex-end; gap: 7px; max-width: 100%; }

.bubble {
  max-width: 460px;
  padding: 8px 12px;
  border-radius: 16px;
  background: var(--in-bg);
  overflow-wrap: anywhere;
}
.turn--in .bubble { border-bottom-left-radius: 5px; }
.turn--out .bubble { background: var(--out-bg); color: var(--out-ink); border-bottom-right-radius: 5px; }

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

.stamp {
  font-size: 11px;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-bottom: 2px;
}

.del {
  border: 0;
  background: transparent;
  color: var(--faint);
  font-size: 12px;
  line-height: 1;
  padding: 4px 5px;
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s, color 0.12s, background 0.12s;
}
.line:hover .del,
.del:focus-visible { opacity: 1; }
.del:hover { color: var(--err-ink); background: var(--err-bg); }

/* ---------- quoted reply ---------- */

.quote {
  border-left: 3px solid currentColor;
  padding: 2px 0 2px 8px;
  margin: 0 0 6px;
  opacity: 0.75;
  font-size: 13px;
}
.quote__sender { font-weight: 700; font-size: 11px; margin-bottom: 1px; }
.turn--out .quote .placeholder { border-color: rgba(255, 255, 255, 0.45); background: rgba(255, 255, 255, 0.12); }

/* ---------- media ---------- */

.media audio { display: block; width: 260px; max-width: 100%; margin: 2px 0; }

.placeholder {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  background: rgba(20, 22, 27, 0.03);
}
.turn--out .placeholder { border-color: rgba(255, 255, 255, 0.45); background: rgba(255, 255, 255, 0.14); }
.placeholder--snap { min-width: 150px; }
.placeholder__glyph { font-size: 15px; opacity: 0.7; }
.placeholder__title { font-size: 13px; font-weight: 600; }
.placeholder__note { font-size: 11px; opacity: 0.7; }

.empty-note { font-size: 12px; opacity: 0.7; font-style: italic; }
.empty-state { color: var(--muted); font-size: 13px; padding: 40px 20px; text-align: center; }

/* ---------- transcript ---------- */

.hint {
  margin: 0 0 12px;
  font-size: 12px;
  color: var(--muted);
  max-width: 720px;
  margin-inline: auto;
}

.transcript {
  max-width: 720px;
  margin: 0 auto;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.55;
  user-select: text;
}
.transcript__block { margin: 0 0 14px; }
.transcript__block:last-child { margin-bottom: 0; }
.transcript strong { font-weight: 700; }

/* ---------- code views ---------- */

.code {
  margin: 0;
  padding: 14px;
  background: var(--code-bg);
  color: var(--code-ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* ---------- undo ---------- */

.undo {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--ink);
  color: #fff;
  padding: 8px 10px 8px 16px;
  border-radius: 10px;
  box-shadow: 0 8px 28px rgba(20, 22, 27, 0.25);
  font-size: 13px;
  z-index: 10;
}
.undo .btn {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}
.undo .btn:hover { background: rgba(255, 255, 255, 0.14); border-color: #fff; color: #fff; }

@media (max-width: 640px) {
  .panel__head--thread { align-items: flex-start; }
  .bubble { max-width: 78vw; }
}