/* LingoBridge design system. Design tokens (Tailwind-style scale);
   components are lb-* classes, no build step or CDN needed. */
:root {
  --lb-bg: #f5f7fa;
  --lb-surface: #ffffff;
  --lb-subtle: #f8fafc;
  --lb-text: #111827;
  --lb-muted: #5b6475;
  --lb-border: #e2e6ee;
  --lb-border-strong: #cdd3df;
  --lb-primary: #3454d1;
  --lb-primary-dark: #2540b0;
  --lb-primary-soft: #eef2ff;
  --lb-accent: #0b7f58;
  --lb-danger: #c0332b;
  --lb-warn: #b7791f;
  --lb-radius: 0.75rem;
  --lb-radius-sm: 0.5rem;
  --lb-shadow-xs: 0 1px 2px rgba(16, 24, 40, .05);
  --lb-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 1px 3px rgba(16, 24, 40, .06);
  --lb-shadow-lg: 0 4px 6px -2px rgba(16, 24, 40, .04), 0 12px 24px -4px rgba(16, 24, 40, .1);
  --lb-focus: 0 0 0 4px rgba(52, 84, 209, .18);
  --lb-font: "Inter", "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", "Noto Sans", sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--lb-bg); color: var(--lb-text);
  font: 15px/1.6 var(--lb-font); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5rem; font-weight: 650; letter-spacing: -.015em; }
h1 { font-size: 1.5rem; letter-spacing: -.022em; } h2 { font-size: 1.15rem; } h3 { font-size: 1rem; }
::selection { background: rgba(52, 84, 209, .18); }
a { color: var(--lb-primary); }
.lb-muted { color: var(--lb-muted); }
.lb-center { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.lb-stack > * + * { margin-top: .85rem; }
.lb-row { display: flex; gap: .75rem; align-items: center; flex-wrap: wrap; }
.lb-between { justify-content: space-between; }
.lb-grid { display: grid; gap: 1rem; }
.lb-grid-2 { grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.lb-grid-3 { grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); }

.lb-card {
  background: var(--lb-surface); border: 1px solid var(--lb-border);
  border-radius: var(--lb-radius); padding: 1.5rem; box-shadow: var(--lb-shadow);
}
.lb-card + .lb-card { margin-top: 1rem; }

.lb-label { display: block; font-weight: 550; font-size: .875rem; margin-bottom: .375rem; color: #344054; }
.lb-hint { font-size: .8125rem; color: var(--lb-muted); }
.lb-input, .lb-select, .lb-textarea {
  width: 100%; padding: .6rem .8rem; font: inherit; color: inherit; background: #fff;
  border: 1px solid var(--lb-border-strong); border-radius: var(--lb-radius-sm); min-height: 2.75rem;
  box-shadow: var(--lb-shadow-xs); transition: border-color .15s, box-shadow .15s;
}
.lb-input::placeholder, .lb-textarea::placeholder { color: #8a93a5; }
.lb-input:hover, .lb-select:hover, .lb-textarea:hover { border-color: #b3bccc; }
.lb-textarea { min-height: 5rem; resize: vertical; }
.lb-input:focus, .lb-select:focus, .lb-textarea:focus { outline: none; border-color: var(--lb-primary); box-shadow: var(--lb-shadow-xs), var(--lb-focus); }
.lb-error-text { color: var(--lb-danger); font-size: .85rem; }
.lb-check { display: flex; gap: .55rem; align-items: center; font-size: .9rem; color: #344054; }
.lb-check input { width: 1.05rem; height: 1.05rem; accent-color: var(--lb-primary); }

.lb-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  min-height: 2.75rem; padding: .55rem 1.1rem; font: inherit; font-size: .9rem; font-weight: 600; text-decoration: none;
  border: 1px solid var(--lb-border-strong); border-radius: var(--lb-radius-sm); background: #fff; color: #344054;
  box-shadow: var(--lb-shadow-xs); cursor: pointer; transition: background .15s, border-color .15s, transform .1s, box-shadow .15s;
}
.lb-btn:hover { background: var(--lb-subtle); border-color: #b3bccc; color: var(--lb-text); }
.lb-btn:active { transform: translateY(1px); }
.lb-btn:focus-visible, a:focus-visible, button:focus-visible, summary:focus-visible { outline: none; box-shadow: var(--lb-focus); }
.lb-btn[disabled] { opacity: .55; cursor: not-allowed; }
.lb-btn-block { width: 100%; }
.lb-btn-primary { background: var(--lb-primary); border-color: var(--lb-primary); color: #fff; box-shadow: var(--lb-shadow-xs), inset 0 1px 0 rgba(255, 255, 255, .12); }
.lb-btn-primary:hover { background: var(--lb-primary-dark); border-color: var(--lb-primary-dark); color: #fff; }
.lb-btn-success { background: var(--lb-accent); border-color: var(--lb-accent); color: #fff; }
.lb-btn-success:hover { background: #096847; color: #fff; }
.lb-btn-danger { background: var(--lb-danger); border-color: var(--lb-danger); color: #fff; }
.lb-btn-danger:hover { background: #9f2821; color: #fff; }
.lb-btn-sm { min-height: 2.25rem; padding: .3rem .75rem; font-size: .85rem; }
.lb-icon-btn { min-width: 2.75rem; padding: .4rem; }

.lb-alert { padding: .75rem 1rem; border-radius: var(--lb-radius-sm); border: 1px solid; margin-bottom: 1rem; font-size: .9rem; }
.lb-alert-success { background: #e8f8f1; border-color: #9ad9bf; color: #0b5b3f; }
.lb-alert-error { background: #fdecea; border-color: #f0b3ae; color: #8f241e; }
.lb-alert-info { background: #eaf0ff; border-color: #b4c4f5; color: #1f3a9e; }

.lb-badge { display: inline-block; padding: .1rem .55rem; border-radius: 999px; font-size: .75rem; font-weight: 600; background: #eaf0ff; color: var(--lb-primary-dark); }
.lb-badge-ok { background: #e8f8f1; color: #0b5b3f; }
.lb-badge-off { background: #eee; color: #555; }

.lb-table { width: 100%; border-collapse: collapse; }
.lb-table th, .lb-table td { text-align: left; padding: .7rem .75rem; border-bottom: 1px solid var(--lb-border); vertical-align: top; }
.lb-table th { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--lb-muted); background: var(--lb-subtle); }
.lb-table tbody tr:hover { background: var(--lb-subtle); }
.lb-table-wrap { overflow-x: auto; position: relative; }

.lb-progress { height: .6rem; background: #e6eaf5; border-radius: 999px; overflow: hidden; }
.lb-progress > span { display: block; height: 100%; background: var(--lb-accent); transition: width .4s ease; }
.lb-stat { font-size: 1.85rem; font-weight: 700; line-height: 1.1; letter-spacing: -.025em; font-variant-numeric: tabular-nums; }

/* Dialog */
dialog.lb-dialog { border: 0; border-radius: var(--lb-radius); padding: 1.25rem; max-width: 26rem; width: calc(100% - 2rem); box-shadow: 0 10px 40px rgba(0,0,0,.25); }
dialog.lb-dialog::backdrop { background: rgba(20, 25, 40, .5); }

/* Toasts */
/* Update bar lives here (not layout.css) so it stays out of the page flow on sign-in pages too. */
.lb-update-bar {
  position: fixed; left: 50%; bottom: 1rem; transform: translateX(-50%); z-index: 120;
  display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; justify-content: center;
  background: #1f2430; color: #fff; padding: .7rem 1rem; border-radius: .75rem; box-shadow: 0 8px 30px rgba(0,0,0,.3);
  max-width: calc(100% - 2rem);
}
#lb-toasts { position: fixed; right: 1rem; bottom: 1rem; display: grid; gap: .5rem; z-index: 100; max-width: calc(100% - 2rem); }
.lb-toast { padding: .7rem 1rem; border-radius: .5rem; background: #1f2430; color: #fff; box-shadow: var(--lb-shadow); animation: lb-in .2s ease; }
.lb-toast-error { background: var(--lb-danger); }

@keyframes lb-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.lb-fade { animation: lb-in .25s ease; }

.lb-skip { position: absolute; left: -999px; top: 0; background: #fff; padding: .5rem 1rem; z-index: 200; }
.lb-skip:focus { left: .5rem; top: .5rem; }
.lb-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

/* Learning cards */
.lb-term { font-size: 1.3rem; font-weight: 700; margin: 0; overflow-wrap: anywhere; }
.lb-term a { color: inherit; text-decoration: none; }
.lb-term a:hover { text-decoration: underline; }
.lb-script { font-size: 1.25rem; margin: .1rem 0 0; }
.lb-meaning { margin: .35rem 0 0; color: var(--lb-muted); }
.lb-speak.is-speaking { background: #eaf0ff; border-color: var(--lb-primary); animation: lb-pulse 1s ease-in-out infinite; }
@keyframes lb-pulse { 50% { box-shadow: 0 0 0 4px rgba(52, 84, 209, .2); } }
/* Waiting for the voice to start: spinner replaces the speaker icon. */
.lb-speak.is-loading { position: relative; color: transparent; text-shadow: none; animation: none; cursor: progress; }
.lb-speak.is-loading::after { content: ""; position: absolute; inset: 0; margin: auto; width: 1rem; height: 1rem; border-radius: 50%;
  border: 2px solid rgba(52, 84, 209, .25); border-top-color: var(--lb-primary); animation: lb-spin .7s linear infinite; }
@keyframes lb-spin { to { transform: rotate(360deg); } }
/* Search matches */
mark.lb-hl { background: #fde68a; color: inherit; border-radius: .2em; padding: 0 .08em; box-decoration-break: clone; -webkit-box-decoration-break: clone; }
#lb-results { transition: opacity .15s; }
#lb-results.is-loading { opacity: .55; }
.lb-guide { margin: .5rem 0 0; padding: .5rem .75rem; background: #fff8e6; border-radius: .5rem; font-size: .9rem; }
.lb-details { margin-top: .6rem; font-size: .95rem; }
.lb-details summary { cursor: pointer; color: var(--lb-primary); font-weight: 600; min-height: 2rem; }
.lb-example { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.lb-learn-card { transition: box-shadow .15s; }
.lb-learn-card:hover { box-shadow: var(--lb-shadow-lg); }
.lb-learn-card + .lb-learn-card { margin-top: 0; }
@media (max-width: 480px) { .lb-term { font-size: 1.15rem; } .lb-learn-card .lb-row { gap: .5rem; } }
.lb-speak.is-unavailable { opacity: .55; border-style: dashed; }

/* Auth screens (sign in, first-run setup): brand panel + form panel */
/* One explicit full-height row: elements added to <body> (browser extensions, bars) cannot steal height from it. */
.lb-auth { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(100vh, auto); align-content: start; background: var(--lb-surface); }
.lb-auth-brand { display: none; }
.lb-auth-main { display: flex; align-items: center; justify-content: center; padding: 2.5rem 1rem; }
.lb-auth-brand, .lb-auth-main { grid-row: 1; }
.lb-auth-panel { width: 100%; max-width: 24rem; }
.lb-auth-panel h1 { font-size: 1.625rem; margin-bottom: .375rem; }
.lb-auth-lead { margin: 0 0 1.75rem; font-size: .95rem; }
.lb-auth-form > * + * { margin-top: 1.125rem; }
.lb-auth-form .lb-btn-block { margin-top: 1.5rem; min-height: 2.875rem; font-size: .95rem; }
.lb-auth-note { margin: 2rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--lb-border); font-size: .8125rem; color: var(--lb-muted); text-align: center; }

.lb-auth-logo { display: flex; align-items: center; gap: .65rem; font-size: 1.2rem; font-weight: 700; letter-spacing: -.02em; }
.lb-auth-logo img { border-radius: .6rem; display: block; }
.lb-auth-logo b { font-weight: 700; color: var(--lb-primary); }
.lb-auth-logo-sm { margin-bottom: 2rem; }

.lb-input-group { position: relative; }
.lb-input-group .lb-input { padding-right: 4.5rem; }
.lb-input-addon {
  position: absolute; top: 50%; right: .375rem; transform: translateY(-50%);
  min-height: 2rem; padding: 0 .7rem; border: 0; border-radius: .375rem; background: transparent;
  font: inherit; font-size: .8125rem; font-weight: 600; color: var(--lb-muted); cursor: pointer;
}
.lb-input-addon:hover { background: var(--lb-primary-soft); color: var(--lb-primary-dark); }
.lb-field .lb-hint { margin: .375rem 0 0; }

@media (min-width: 900px) {
  .lb-auth { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); }
  .lb-auth-brand {
    display: flex; flex-direction: column; justify-content: space-between; gap: 2rem;
    padding: 2.75rem 3.5rem; color: #fff; position: relative; overflow: hidden;
    background:
      radial-gradient(60rem 30rem at 110% -10%, rgba(129, 154, 255, .45), transparent 60%),
      radial-gradient(40rem 30rem at -20% 120%, rgba(16, 185, 129, .22), transparent 60%),
      linear-gradient(160deg, #2b46c0 0%, #1d2f8a 55%, #141f5c 100%);
  }
  .lb-auth-brand::before {
    content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
    background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
    background-size: 44px 44px;
    -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 85%); mask-image: linear-gradient(180deg, #000 0%, transparent 85%);
  }
  .lb-auth-brand > * { position: relative; }
  .lb-auth-brand .lb-auth-logo b { color: #c7d2fe; }
  .lb-auth-brand .lb-auth-logo img { box-shadow: 0 0 0 1px rgba(255,255,255,.25); }
  .lb-auth-pitch { max-width: 30rem; }
  .lb-auth-headline { font-size: 2.25rem; line-height: 1.15; font-weight: 700; letter-spacing: -.03em; margin: 0 0 1rem; }
  .lb-auth-sub { margin: 0 0 2rem; color: rgba(255,255,255,.78); font-size: 1rem; }
  .lb-auth-points { list-style: none; margin: 0; padding: 0; display: grid; gap: .85rem; }
  .lb-auth-points li { display: flex; gap: .75rem; align-items: flex-start; color: rgba(255,255,255,.92); font-size: .95rem; }
  .lb-auth-points li::before {
    content: ""; flex: none; width: 1.25rem; height: 1.25rem; margin-top: .1rem; border-radius: 999px;
    background: rgba(255,255,255,.14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 10.5l2.5 2.5L14 7.5'/%3E%3C/svg%3E") center / 100% no-repeat;
  }
  .lb-auth-foot { margin: 0; font-size: .8125rem; color: rgba(255,255,255,.6); }
  .lb-auth-main { padding: 3rem; }
  .lb-auth-logo-sm { display: none; }
}

/* Error pages (404, 500, ...) */
.lb-error-page { min-height: 100vh; margin: 0; display: flex; align-items: center; justify-content: center; padding: 2rem 1rem;
  background: radial-gradient(50rem 28rem at 50% -10%, rgba(52, 84, 209, .10), transparent 70%), var(--lb-bg); }
.lb-error { width: 100%; max-width: 28rem; display: flex; flex-direction: column; align-items: center; gap: 1.75rem; }
.lb-error-card { width: 100%; text-align: center; background: var(--lb-surface); border: 1px solid var(--lb-border);
  border-radius: 1rem; padding: 2.25rem 2rem 2rem; box-shadow: var(--lb-shadow-lg); }
.lb-error-code { display: inline-block; margin: 0 0 1rem; padding: .2rem .7rem; border-radius: 999px;
  background: var(--lb-primary-soft); color: var(--lb-primary-dark); font-size: .75rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.lb-error-card h1 { font-size: 1.5rem; margin-bottom: .5rem; }
.lb-error-card .lb-muted { margin: 0; }
.lb-error-actions { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.75rem; }
.lb-error-ref { margin: 1.75rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--lb-border); font-size: .8125rem; color: var(--lb-muted); line-height: 1.7; }
.lb-error-ref code { padding: .1rem .45rem; border-radius: .375rem; background: var(--lb-subtle); border: 1px solid var(--lb-border); color: var(--lb-text); font-size: .8125rem; }

/* Add/edit form: "Fill with AI" helper */
.lb-ai { border: 1px dashed #b4c4f5; background: linear-gradient(180deg, var(--lb-primary-soft), #fff 70%); border-radius: var(--lb-radius); padding: 1rem 1.1rem; }
.lb-ai-head h2 { font-size: 1rem; display: flex; align-items: center; gap: .5rem; margin-bottom: .2rem; }
.lb-ai-head .lb-hint { margin: 0; }
.lb-ai-steps { margin: .85rem 0 0; padding-left: 1.25rem; display: grid; gap: .85rem; }
.lb-ai-steps li::marker { color: var(--lb-primary); font-weight: 700; }
.lb-ai-preview { margin-top: .5rem; font-size: .9rem; }
.lb-ai-preview summary { cursor: pointer; color: var(--lb-primary); font-weight: 600; }
.lb-ai-preview textarea { margin-top: .4rem; font-size: .8125rem; font-family: ui-monospace, Consolas, monospace; }