:root {
  --bg: #0f1220;
  --panel: #1a1f33;
  --panel-2: #232a44;
  --ink: #e8ecf6;
  --muted: #9aa3bd;
  --accent: #ffce4f;
  --accent-2: #4f8cff;
  --good: #3ecf8e;
  --bad: #ff6b6b;
  --line: #2e3656;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}
.loading { padding: 4rem; text-align: center; color: var(--muted); }
button { font: inherit; cursor: pointer; }
a { color: var(--accent-2); }

/* layout */
.topbar {
  display: flex; align-items: center; gap: 1rem;
  padding: .7rem 1rem; background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10; flex-wrap: wrap;
}
.brand { font-weight: 800; letter-spacing: .5px; }
.brand .flag { font-size: 1.2rem; }
.nav { display: flex; gap: .3rem; flex-wrap: wrap; }
.nav button {
  background: transparent; color: var(--muted); border: 1px solid transparent;
  padding: .4rem .8rem; border-radius: 999px;
}
.nav button.active, .nav button:hover { background: var(--panel-2); color: var(--ink); }
.spacer { flex: 1; }
.who { color: var(--muted); font-size: .9rem; }
.container { max-width: 880px; margin: 0 auto; padding: 1.2rem; }

/* cards */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; margin-bottom: 1rem; }
.card h2 { margin: 0 0 .3rem; }
.card h3 { margin: 1rem 0 .4rem; }
.muted { color: var(--muted); }
.pill { display: inline-block; padding: .15rem .6rem; border-radius: 999px; font-size: .78rem; background: var(--panel-2); color: var(--muted); }
.pill.good { background: rgba(62,207,142,.15); color: var(--good); }
.pill.bad { background: rgba(255,107,107,.15); color: var(--bad); }
.pill.warn { background: rgba(255,206,79,.15); color: var(--accent); }

/* buttons */
.btn { background: var(--accent-2); color: #fff; border: none; padding: .6rem 1.1rem; border-radius: 10px; font-weight: 600; }
.btn.alt { background: var(--panel-2); color: var(--ink); border: 1px solid var(--line); }
.btn.gold { background: var(--accent); color: #20180a; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.small { padding: .35rem .7rem; font-size: .85rem; }

/* login */
.login-wrap { max-width: 360px; margin: 8vh auto; }
.login-wrap input { width: 100%; padding: .7rem; margin: .4rem 0; border-radius: 10px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); }
.error { color: var(--bad); min-height: 1.2em; }

/* dashboard */
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.stat { background: var(--panel-2); border-radius: 12px; padding: 1rem; }
.stat .big { font-size: 2rem; font-weight: 800; }
.bar { height: 10px; background: var(--panel-2); border-radius: 999px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-2), var(--good)); }

/* weeks list */
.week-row { display: flex; align-items: center; gap: .8rem; padding: .7rem; border: 1px solid var(--line); border-radius: 12px; margin-bottom: .6rem; background: var(--panel); }
.week-row .num { width: 38px; height: 38px; border-radius: 10px; background: var(--panel-2); display: grid; place-items: center; font-weight: 800; }
.week-row:hover { border-color: var(--accent-2); }

/* lessons */
.lesson { border: 1px solid var(--line); border-radius: 12px; margin-bottom: .6rem; overflow: hidden; }
.lesson > summary { padding: .8rem 1rem; cursor: pointer; font-weight: 600; background: var(--panel-2); }
.lesson .body { padding: 1rem; }
.ex { display: flex; justify-content: space-between; gap: 1rem; padding: .35rem 0; border-bottom: 1px dashed var(--line); }
.ex .de { font-weight: 600; }
.ex .en { color: var(--muted); text-align: right; }
.ex button { background: none; border: none; color: var(--accent); font-size: 1.1rem; }
.tip { margin-top: .6rem; padding: .6rem .8rem; border-left: 3px solid var(--accent); background: var(--panel-2); border-radius: 0 8px 8px 0; }

/* vocab card */
.flash { text-align: center; padding: 2rem 1rem; }
.flash .word { font-size: 2.2rem; font-weight: 800; }
.flash .art { color: var(--accent); }
.flash .en { font-size: 1.3rem; color: var(--muted); margin-top: .5rem; }
.flash .ex { justify-content: center; border: none; color: var(--muted); }
.srs-btns { display: flex; gap: .5rem; justify-content: center; margin-top: 1rem; flex-wrap: wrap; }
.srs-btns button { border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); padding: .5rem 1rem; border-radius: 10px; }

/* quiz */
.q { padding: .8rem 0; border-bottom: 1px solid var(--line); }
.q .prompt { font-weight: 600; margin-bottom: .5rem; }
.opt { display: block; width: 100%; text-align: left; padding: .55rem .8rem; margin: .25rem 0; border-radius: 10px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); }
.opt.sel { border-color: var(--accent-2); background: rgba(79,140,255,.15); }
.opt.correct { border-color: var(--good); background: rgba(62,207,142,.15); }
.opt.wrong { border-color: var(--bad); background: rgba(255,107,107,.15); }
.q input.fill { padding: .5rem .7rem; border-radius: 10px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); width: 100%; max-width: 280px; }
.feedback { margin-top: .5rem; font-size: .9rem; }
textarea { width: 100%; min-height: 120px; padding: .7rem; border-radius: 10px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink); font: inherit; }

/* mic */
.mic { width: 76px; height: 76px; border-radius: 50%; border: none; background: var(--accent-2); color: #fff; font-size: 1.8rem; display: grid; place-items: center; margin: 0 auto; }
.mic.rec { background: var(--bad); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100%{ box-shadow: 0 0 0 0 rgba(255,107,107,.5);} 50%{ box-shadow: 0 0 0 14px rgba(255,107,107,0);} }
.transcript { margin-top: .8rem; padding: .7rem; border-radius: 10px; background: var(--panel-2); min-height: 2.5em; }

.corrections li { margin: .3rem 0; }
.corrections .x { color: var(--bad); }
.corrections .v { color: var(--good); }
.score-big { font-size: 2.4rem; font-weight: 800; }
.modgrid { display: grid; gap: .6rem; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); }
hr.sep { border: none; border-top: 1px solid var(--line); margin: 1rem 0; }
.center { text-align: center; }
.row { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }