:root {
  --ink: #1b1b19;
  --muted: #45443f;
  --bg: #f7f4ee;
  --card: #ffffff;
  --line: #cfc8b8;
  --green: #1c3829;
  --green-ink: #ffffff;
  --focus: #0b57d0;
  --gold: #f2b705;
  --gold-dark: #6b5000;
  --bot: #eef2ec;
  --me: #1c3829;
  --err: #8a1c1c;
  --err-bg: #fbeaea;
  --ok-bg: #e6f2ea;
  --off-bg: #e4e0d5;
  --off-ink: #4a4944;
  font-size: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; box-shadow: 0 0 0 6px #fff; }
h1 { font-size: 1.3rem; margin: 0; }
label { font-weight: 600; display: block; margin-bottom: .35rem; }
input, textarea, select { font: inherit; color: inherit; border: 2px solid #6f6a5c; border-radius: 10px; padding: .6rem .75rem; background: #fff; width: 100%; min-height: 52px; }
.btn { font: inherit; font-weight: 600; min-height: 52px; padding: .55rem 1.1rem; border-radius: 10px; border: 2px solid var(--green); background: #fff; color: var(--green); cursor: pointer; }
.btn.primary { background: var(--green); color: var(--green-ink); }
.btn.big { width: 100%; font-size: 1.15rem; min-height: 60px; }
.btn.secondary { background: #fff; }
.btn.link { border: 0; background: none; text-decoration: underline; padding: .5rem; color: var(--green); }
.btn:disabled { background: var(--off-bg); border-color: #b9b3a3; color: var(--off-ink); cursor: not-allowed; }
.btn.link:disabled { background: none; }
a.btn, .linkbtn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.msg { min-height: 1.5em; margin: .5rem 0 0; }
.msg.err { color: var(--err); font-weight: 600; }
.msg.work, .log li.work { display: flex; align-items: center; gap: .6rem; }
.spinner { flex: none; width: 1.1rem; height: 1.1rem; border: 3px solid #b9c4bb; border-top-color: var(--green); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; border-top-color: #b9c4bb; border-left-color: var(--green); } }

/* login */
.login { min-height: 100%; display: grid; place-items: center; padding: 1.5rem; }
.login-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 2rem; width: min(480px, 100%); }
.login-card h1 { margin-bottom: 1.25rem; font-size: 1.6rem; line-height: 1.25; }
.login-card form { display: grid; gap: .75rem; }
.login-card .btn { width: 100%; font-size: 1.1rem; min-height: 56px; }
.code-box { font-size: 1.6rem; letter-spacing: .25em; text-align: center; font-variant-numeric: tabular-nums; min-height: 60px; }

/* app */
.app { height: 100%; display: flex; flex-direction: column; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .5rem 1rem; background: var(--card); border-bottom: 1px solid var(--line); }
.top-links { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.top-links a:not(.btn) { color: var(--green); font-weight: 600; min-height: 52px; display: inline-flex; align-items: center; }
.top-links a.btn { color: var(--green-ink); }
.who { color: var(--muted); }
.split { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(420px, 32%) 1fr; }
.chat { display: flex; flex-direction: column; min-height: 0; background: var(--card); border-right: 1px solid var(--line); padding: .75rem; gap: .75rem; }
.notice { margin: 0; padding: .6rem .8rem; background: #fff4cc; border: 2px solid var(--gold-dark); border-radius: 10px; }
.log { list-style: none; margin: 0; padding: 0; flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: .75rem; min-height: 120px; }
.log li { max-width: 94%; padding: .7rem .9rem; border-radius: 14px; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 1.1rem; line-height: 1.45; }
.log li.bot { background: var(--bot); align-self: flex-start; }
.log li.me { background: var(--me); color: #fff; align-self: flex-end; }
.log li.err { background: var(--err-bg); color: var(--err); border-left: 6px solid var(--err); font-weight: 600; }
.log li.ok { background: var(--ok-bg); border-left: 6px solid var(--green); }
.log li.work { color: var(--muted); }
.log .choices { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .6rem; white-space: normal; }
.log .choices.stack { flex-direction: column; align-items: stretch; }
.log .choices.stack .btn { text-align: left; min-height: 56px; }
.log a:not(.btn) { color: var(--green); font-weight: 700; }
.log a.btn { margin-top: .6rem; display: inline-flex; }
.log li.confirm { background: #fff; border: 3px solid var(--green); max-width: 100%; align-self: stretch; white-space: normal; }
.confirm-head { margin: 0 0 .4rem; font-weight: 700; }
.confirm-list { margin: 0 0 .6rem; padding-left: 1.3rem; }
.confirm-list li { display: list-item; max-width: none; padding: 0 0 .35rem; margin: 0; background: none; border-radius: 0; font-size: inherit; }
.confirm-ask { margin: 0; font-weight: 700; }
.confirm .choices .btn { flex: 1 1 8rem; text-align: center; padding-inline: .4rem; }
.picked { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .25rem .5rem .25rem .8rem; background: #fff7d6; border: 3px solid var(--gold-dark); border-radius: 10px; }
.picked-line { margin: 0; overflow-wrap: anywhere; flex: 1; min-width: 0; }
.picked .btn { flex: none; }
.ask-row { display: flex; gap: .5rem; align-items: stretch; }
.ask textarea { resize: vertical; }
.ask .btn { min-width: 5.5rem; }
.actions { display: grid; gap: .4rem; border-top: 1px solid var(--line); padding-top: .75rem; }
.hint-line { margin: 0; color: var(--muted); }
.actions-row { display: flex; gap: .5rem; flex-wrap: wrap; }
.actions-row .btn { flex: 1 1 9rem; }
.actions .msg { margin: 0; }
.preview { display: flex; flex-direction: column; min-height: 0; }
.preview-bar { display: flex; align-items: center; gap: .6rem; padding: .4rem .75rem; background: var(--card); border-bottom: 1px solid var(--line); }
.preview-bar label { margin: 0; }
.preview-bar select { width: auto; min-width: 12rem; }
.preview-bar .hint { color: var(--muted); }
#frame { flex: 1; width: 100%; border: 0; background: #fff; }

/* past changes */
.history { max-width: 900px; margin: 0 auto; padding: 1rem; }
.history-list { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: .75rem; }
.entry { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: .8rem 1rem; }
.entry p { margin: 0; overflow-wrap: anywhere; }
.entry-what { font-size: 1.1rem; font-weight: 600; }
.entry-meta { color: var(--muted); margin-top: .25rem; }
.tag { display: inline-block; background: #d4e8da; color: var(--green); border: 1px solid var(--green); border-radius: 6px; padding: 0 .45rem; font-size: 1rem; font-weight: 700; white-space: nowrap; }
.entry-what .tag { display: table; margin-top: .35rem; }

/* phones: preview on top, chat below. One page scroll, no scroll boxes inside it. */
@media (max-width: 820px) {
  .app { height: auto; min-height: 100%; }
  .split { display: flex; flex-direction: column; }
  .preview { order: 1; height: 48vh; }
  .chat { order: 2; border-right: 0; border-top: 1px solid var(--line); }
  .log { overflow: visible; }
  .log li { max-width: 100%; }
  .preview-bar .hint { display: none; }
  .top { flex-wrap: wrap; gap: 0 1rem; padding-top: .25rem; padding-bottom: .25rem; }
  .who { display: none; }
  .login-card { padding: 1.5rem; }
}