:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #1d2433;
  --muted: #667085;
  --border: #e3e6ee;
  --accent: #3563e9;
  --user: #e8efff;
  --tutor: #ffffff;
  --good: #1a9a5b;
  --mid: #e08a00;
  --low: #d63a3a;
  --rec: #e5484d;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --panel: #1b2029;
    --text: #e6e9f0;
    --muted: #9aa3b5;
    --border: #2c3340;
    --accent: #6d8ff5;
    --user: #24304a;
    --tutor: #1b2029;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header { padding: 12px 16px; background: var(--panel); border-bottom: 1px solid var(--border); }
h1 { font-size: 1.15rem; margin: 0 0 8px; }
.title-row { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
#account { font-size: 0.82rem; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#account .link { padding: 0 0 0 6px; font-size: inherit; }
#account a { color: var(--accent); padding-left: 6px; }

/* Sign-in screen: shown instead of the app until the user is signed in. */
body.signed-out > :not(#login, dialog, script) { display: none; }
#login { max-width: 420px; margin: 15vh auto 0; padding: 0 16px; text-align: center; }
#login h1 { font-size: 1.5rem; }
#login p { color: var(--muted); }
#login-buttons { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; }
.login-btn { display: block; padding: 10px 16px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel); color: var(--text); text-decoration: none; font-weight: 600; }
.login-btn:hover { border-color: var(--accent); }
.login-btn.apple { background: #000; color: #fff; border-color: #000; }
@media (prefers-color-scheme: dark) { .login-btn.apple { background: #fff; color: #000; border-color: #fff; } }
#setup { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
#setup label { display: flex; flex-direction: column; font-size: 0.8rem; color: var(--muted); gap: 2px; }
#setup .grow { flex: 1 1 200px; }
select, input, button {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}
button { cursor: pointer; }
button:disabled { opacity: 0.5; cursor: default; }
#start, #send { background: var(--accent); color: #fff; border-color: var(--accent); }

main {
  flex: 1;
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hint { color: var(--muted); }

.msg { max-width: 85%; padding: 10px 14px; border-radius: 14px; border: 1px solid var(--border); }
.msg.user { align-self: flex-end; background: var(--user); border-bottom-right-radius: 4px; }
.msg.tutor { align-self: flex-start; background: var(--tutor); border-bottom-left-radius: 4px; }
.msg .meta { margin-top: 6px; font-size: 0.78rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.msg.interim { opacity: 0.6; font-style: italic; }

.w { border-radius: 3px; }
.w.s-mid, .s-mid { text-decoration: underline wavy var(--mid); text-underline-offset: 3px; }
.w.s-low, .s-low { text-decoration: underline wavy var(--low); text-underline-offset: 3px; }
.w.s-mid, .w.s-low { cursor: help; }
.w.omit { color: var(--low); text-decoration: line-through; }

.pill { padding: 1px 8px; border-radius: 999px; border: 1px solid var(--border); white-space: nowrap; }
.pill.good { color: var(--good); }
.pill.mid { color: var(--mid); }
.pill.low { color: var(--low); }

.practice { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.practice button { font-size: 0.8rem; padding: 3px 9px; border-radius: 999px; text-align: left; }
.practice button.listening { border-color: var(--rec); color: var(--rec); }
.icon-btn { border: none; background: none; padding: 0 4px; font-size: 1rem; }
.icon-btn.expander { font-size: 0.8rem; color: var(--muted); }
.icon-btn.expander:hover { color: var(--accent); }
.practice-panel, .details-panel { margin-top: 4px; }
.details-panel .meta { margin-top: 2px; }
.reveal { border: none; background: none; padding: 0; color: var(--muted); font-style: italic; }
.reveal:hover { color: var(--accent); }
.hint-small { font-size: 0.78rem; color: var(--muted); margin-top: 4px; }

.practice-result { margin-top: 6px; padding: 8px 10px; border-radius: 8px; background: var(--bg); font-size: 0.9rem; }

.msg.feedback { align-self: stretch; max-width: none; background: var(--panel); border-left: 4px solid var(--accent); }
.msg.feedback h3 { margin: 0 0 6px; font-size: 0.95rem; }
.msg.feedback .body { white-space: pre-wrap; }
.msg.feedback .meta { border-top: 1px solid var(--border); padding-top: 8px; margin-top: 10px; }

footer {
  position: sticky;
  bottom: 0;
  background: var(--panel);
  border-top: 1px solid var(--border);
  padding: 10px 16px;
}
.controls { max-width: 820px; margin: 0 auto; display: flex; gap: 10px; align-items: center; }
.typed { flex: 1; display: flex; gap: 6px; min-width: 0; }
.typed input { flex: 1; min-width: 0; }
.round { border-radius: 50%; flex: none; padding: 0; display: grid; place-items: center; }
.round[hidden] { display: none; }
.mic { width: 56px; height: 56px; font-size: 1.5rem; background: var(--accent); border-color: var(--accent); }
.cancel { width: 40px; height: 40px; font-size: 1.1rem; color: var(--rec); }
.settings-btn { width: 40px; height: 40px; font-size: 1.25rem; }

dialog {
  border: 1px solid var(--border); border-radius: 14px; padding: 0;
  background: var(--panel); color: var(--text);
  width: min(480px, calc(100vw - 32px));
}
dialog::backdrop { background: rgb(0 0 0 / 0.4); }
dialog form { padding: 16px 20px; }
dialog h2 { margin: 0 0 8px; font-size: 1.1rem; }
fieldset { border: none; padding: 0; margin: 14px 0; }
legend { font-weight: 600; margin-bottom: 4px; }
input[type="range"] { width: 100%; padding: 0; accent-color: var(--accent); }
.ticks { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--muted); }
.desc { font-size: 0.85rem; color: var(--muted); margin: 6px 0 0; min-height: 2.5em; }
.row { display: flex; flex-wrap: wrap; gap: 10px; }
.row label { display: flex; flex-direction: column; font-size: 0.8rem; color: var(--muted); gap: 2px; flex: 1 1 120px; }
.check { display: flex; gap: 8px; align-items: center; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.link { border: none; background: none; color: var(--accent); padding: 6px 0; }
.dialog-actions { display: flex; justify-content: flex-end; }
.dialog-actions button { background: var(--accent); color: #fff; border-color: var(--accent); padding: 6px 18px; }
.mic.listening { background: var(--rec); border-color: var(--rec); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgb(229 72 77 / 0.5); } 50% { box-shadow: 0 0 0 10px rgb(229 72 77 / 0); } }
#status { max-width: 820px; margin: 0 auto 6px; font-size: 0.82rem; color: var(--muted); min-height: 1.2em; }
#status.error { color: var(--low); }

@media (max-width: 560px) {
  .controls { flex-wrap: wrap; }
  .typed { order: 3; flex-basis: 100%; }
  .msg { max-width: 95%; }
}

/* Admin: user management */
body.admin main { max-width: 980px; }
.title-row a { color: var(--accent); font-size: 0.85rem; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.filters button { font-size: 0.85rem; padding: 3px 12px; border-radius: 999px; }
.filters button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
#users { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
#users th, #users td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; font-size: 0.9rem; }
#users th { font-size: 0.78rem; color: var(--muted); font-weight: 600; }
#users td:nth-child(2) { white-space: pre-line; font-size: 0.8rem; color: var(--muted); }
#users .name { font-weight: 600; }
#users .actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
#users .actions button { font-size: 0.82rem; padding: 3px 10px; }
#users .actions button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
@media (max-width: 640px) {
  #users thead { display: none; }
  #users tr { display: block; border-bottom: 1px solid var(--border); padding: 6px 0; }
  #users td { display: block; border: none; padding: 2px 10px; }
  #users .actions { justify-content: flex-start; }
}

.text-page { max-width: 720px; display: block; }
.text-page h2 { font-size: 1.05rem; margin-top: 1.5em; }
.text-page a { color: var(--accent); }