:root {
  color-scheme: dark;
  --bg: #10151e;
  --panel: #18212e;
  --surface: #202d3d;
  --border: #344255;
  --text: #eef3f8;
  --muted: #adbdce;
  --accent: #61c9b5;
  --on-accent: #000;
}
:root[data-theme=light] { color-scheme: light; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 Inter, "Segoe UI", system-ui, sans-serif;
}
.shell { max-width: 1240px; margin: auto; padding: 30px 28px; }
header, .brand, .section-heading, .connection, .word-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
header { min-height: 60px; margin-bottom: 28px; position: relative; }
.brand { justify-content: flex-start; }
.logo {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 800;
  font-size: 20px;
}
h1 { font-size: 23px; margin: 0; letter-spacing: -.5px; }
header p { font-size: 12px; margin: 0; color: var(--muted); }
h2 { font-size: 25px; margin: 8px 0 16px; letter-spacing: -.5px; }
h3 { font-size: 14px; margin: 22px 0 7px; color: var(--text); }
p { margin: 8px 0; white-space: pre-wrap; }
a { color: var(--text); text-decoration-color: var(--accent); text-underline-offset: 4px; }
button, input, select, textarea { font: inherit; }
button {
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 14px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
button:hover { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: wait; }
.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 650; }
.secondary { background: transparent; }
.text-button { background: transparent; border: 0; padding: 4px; text-decoration: underline; text-underline-offset: 4px; }
input, textarea, select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
}
input:focus, textarea:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
input[type=checkbox] { width: auto; accent-color: var(--accent); }
textarea { resize: vertical; }
label { display: block; margin: 12px 0; color: var(--muted); font-size: 13px; }
.workspace { display: grid; grid-template-columns: 176px minmax(0, 1fr); gap: 32px; }
.sidebar { align-self: start; position: sticky; top: 22px; }
.workspace-main { min-width: 0; }
nav { display: flex; gap: 5px; margin: 18px 0 24px; flex-wrap: wrap; }
.sidebar nav { flex-direction: column; margin: 0; }
nav button { text-align: left; border-color: transparent; background: transparent; color: var(--muted); padding: 11px 15px; }
nav button.active { background: var(--surface); border-color: var(--border); color: var(--text); box-shadow: inset 3px 0 var(--accent); font-weight: 650; }
.connection { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.card, .word-card, .review-box { padding: 22px; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; }
.account-card { padding: 13px 18px; margin: 8px 0 26px; }
.account-card summary { font-size: 13px; font-weight: 600; }
.account-card[open] summary { margin-bottom: 16px; }
.account-card .actions button { font-size: 12px; }
#page-status { padding: 12px 18px; margin: 12px 0; }
#page-status p { font-size: 12px; margin-bottom: 0; }
.word-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 20px; }
.word-card { display: flex; flex-direction: column; }
.word-card h3 { font-size: 25px; margin: 0 0 8px; letter-spacing: -.4px; }
.word-card .context { color: var(--muted); font-size: 13px; margin: 14px 0; border-left: 2px solid var(--border); padding-left: 12px; }
.actions, .admin-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }
.word-card .actions { margin-top: 18px; }
.word-card button { font-size: 12px; padding: 7px 10px; }
.muted, .phonetic { color: var(--muted); }
.empty { padding: 40px 22px; border: 1px dashed var(--border); border-radius: 14px; color: var(--muted); grid-column: 1/-1; text-align: center; }
.badge { display: inline-block; font-size: 12px; padding: 5px 11px; border-radius: 20px; background: var(--surface); }
.review-box { text-align: center; padding: 32px; }
.review-box h2 { font-size: 36px; margin: 24px 0; }
.review-answer { text-align: left; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.review-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 24px; }
.contextual-usage { border-top: 1px solid var(--border); padding-top: 8px; margin-top: 24px; }
.chat-options { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
#chat-log { display: flex; flex-direction: column; gap: 16px; margin: 22px 0; max-height: 480px; overflow: auto; }
.bubble { padding: 16px 20px; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; white-space: pre-wrap; max-width: 94%; }
.bubble.user { background: var(--surface); align-self: flex-end; }
.bubble small { display: block; color: var(--muted); margin-bottom: 5px; }
#chat-form button { margin: 10px 6px 0 0; }
#notice:not(:empty) { border-left: 3px solid #c84d68; background: var(--surface); color: var(--text); padding: 12px 16px; margin: 14px 0; border-radius: 8px; }
details { margin: 16px 0; }
summary { cursor: pointer; }
details.card button { margin: 5px; }
details.card > p { overflow-wrap: anywhere; font-size: 13px; }
.theme-settings { margin: 22px 0 0; font-size: 12px; }
.theme-settings summary { color: var(--muted); }
.theme-field { font-size: 12px; }
.theme-field input[type=color] { display: block; height: 38px; padding: 4px; cursor: pointer; }
header > .theme-settings { margin: 0; align-self: flex-start; width: 220px; }
.theme-field input[type=checkbox] { margin-left: 8px; }
.time-totals { display: flex; gap: 22px; align-items: baseline; flex-wrap: wrap; margin: 30px 0 22px; }
.time-totals > strong { font-size: 30px; }
.time-languages { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.time-row { display: grid; gap: 6px; padding: 22px; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; }
.time-row h3 { margin: 0; }
.time-row strong { font-size: 25px; }
.time-row span { font-size: 12px; }
.audio-options { display: flex; gap: 8px; }
.audio-options select { min-width: 0; }
dialog { color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: 18px; width: min(590px, calc(100vw - 28px)); max-height: 85vh; padding: 26px; }
dialog::backdrop { background: #0008; }
.close { float: right; }
.word-detail h2 { font-size: 30px; }
.word-detail > small { display: block; margin-top: 14px; }
.example { margin-top: 16px; }
footer { margin-top: 38px; padding-top: 18px; border-top: 1px solid var(--border); font-size: 12px; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.admin-shell { max-width: 1250px; }
.admin-shell main > .card { margin: 22px 0; }
.admin-controls label { margin: 0; }
.admin-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 20px 0; }
.admin-stats strong { font-size: 28px; }
.table-scroll { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; text-align: left; }
.admin-table th, .admin-table td { padding: 11px 12px; border-bottom: 1px solid var(--border); overflow-wrap: anywhere; }
.user-admin { margin: 16px 0; }
.permission-grid { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.permission-grid label { display: flex; gap: 6px; align-items: center; }
.invitation { overflow-wrap: anywhere; }
@media(max-width: 700px) {
  .shell { padding: 20px 16px; }
  .workspace { display: block; }
  .sidebar { position: static; }
  .sidebar nav { flex-direction: row; flex-wrap: nowrap; overflow: auto; padding-bottom: 8px; margin-bottom: 12px; }
  .sidebar nav button { flex: 0 0 auto; padding: 9px 12px; font-size: 13px; }
  .sidebar .theme-settings { margin: 0 0 18px; }
  .theme-settings[open] { padding: 14px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; }
  .theme-field { display: inline-flex; gap: 8px; align-items: center; margin: 8px 10px 8px 0; }
  .theme-field select { width: 135px; }
  .theme-field input[type=color] { width: 50px; }
  header { gap: 10px; margin-bottom: 18px; align-items: flex-start; }
  .brand { gap: 10px; }
  h1 { font-size: 19px; }
  h2 { font-size: 22px; }
  .logo { width: 40px; height: 40px; flex-shrink: 0; }
  header > button { font-size: 12px; padding: 7px 9px; }
  .chat-options { grid-template-columns: 1fr; gap: 0; }
  .word-list { grid-template-columns: 1fr; }
  .section-heading { flex-wrap: wrap; }
  .account-card { margin-bottom: 20px; }
  header > .theme-settings { width: auto; max-width: 180px; }
}
@media(prefers-reduced-motion: reduce) { * { transition: none !important; } }