:root {
  --bg: #0f1115;
  --panel: #171a21;
  --border: #262b36;
  --text: #e6e9ef;
  --muted: #8b93a3;
  --accent: #5cb85c;
  --accent-dim: #2f5d3a;
  --warn: #d4a017;
  --danger: #c0392b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: #12151b;
}

.brand { color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.1rem; }
.brand span { color: var(--accent); }

.topbar nav { display: flex; gap: 1.25rem; align-items: center; margin-left: auto; }
.topbar nav a { color: var(--muted); text-decoration: none; }
.topbar nav a:hover { color: var(--text); }

.inline { display: inline; }
button.linklike {
  background: none; border: none; color: var(--muted);
  font: inherit; cursor: pointer; padding: 0;
}
button.linklike:hover { color: var(--text); }

main { max-width: 760px; margin: 2rem auto; padding: 0 1.25rem; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
}

h1 { font-size: 1.35rem; margin: 0 0 0.5rem; }
.muted { color: var(--muted); }
.error { color: var(--danger); }

.lesson-list { list-style: none; padding: 0; margin: 1rem 0 0; }
.lesson-list li { margin: 0.4rem 0; }
.lesson-list a { color: var(--accent); text-decoration: none; }
.lesson-list a:hover { text-decoration: underline; }

.login { display: grid; place-items: center; min-height: 100vh; }
.login-card { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 2rem; width: min(90vw, 340px); }
.login-card h1 { text-align: center; }
.login-card h1 span { color: var(--accent); }
.login-card label { display: block; margin-bottom: 0.35rem; color: var(--muted); }
.login-card input {
  width: 100%; padding: 0.55rem 0.7rem; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
  font: inherit;
}
.login-card button {
  margin-top: 1rem; width: 100%; padding: 0.55rem; border-radius: 6px;
  border: 1px solid var(--accent-dim); background: var(--accent-dim); color: var(--text);
  font: inherit; font-weight: 700; cursor: pointer;
}
.login-card button:hover { background: var(--accent); color: #0f1115; }

/* quiz card */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem 1.75rem; }
.card .tag { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.card .prompt { background: #1e1d27; color: #e9e8f2; border-radius: 8px; padding: 14px 16px; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .95rem; white-space: pre-wrap; overflow-x: auto; margin: 12px 0; }
.card .goal { color: var(--muted); margin: 8px 0 16px; }
.card input[type=text] {
  width: 100%; padding: 0.7rem 0.85rem; border-radius: 8px; border: 1.5px solid var(--border);
  background: #0c0e12; color: var(--text); font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.05rem;
}
.card input[type=text]:focus { outline: none; border-color: var(--accent); }
.card .row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.card button {
  padding: 0.55rem 1.05rem; border-radius: 8px; border: 1px solid var(--border);
  background: #22272f; color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
}
.card button.primary { background: var(--accent-dim); border-color: var(--accent-dim); color: var(--text); }
.card button.primary:hover { background: var(--accent); color: #0f1115; }
.card button:hover { border-color: var(--accent); }
.card .opt { display: block; width: 100%; text-align: left; margin: 8px 0; padding: 12px 16px; border-radius: 9px; border: 1.5px solid var(--border); background: #0c0e12; cursor: pointer; font: inherit; color: var(--text); }
.card .opt:hover { border-color: var(--accent); }
.card .opt.correct { background: #14371f; border-color: #2f7d4b; }
.card .opt.wrong { background: #3a1a20; border-color: #8e2f3d; }
.feedback { margin-top: 14px; padding: 12px 16px; border-radius: 9px; font-size: .94rem; }
.feedback.ok { background: #10291c; color: #7ee0ab; border: 1px solid #2f7d4b; }
.feedback.bad { background: #2b141a; color: #f0a6b2; border: 1px solid #8e2f3d; }
.feedback.hint { background: #262015; color: #eccf85; border: 1px solid #8a6d2a; }
.feedback .banner { font-weight: 700; }
.card .hintbox { margin-top: 12px; padding: 10px 14px; border-radius: 8px; background: #262015; color: #eccf85; border: 1px solid #8a6d2a; font-size: .92rem; }
.card .answerbox { margin-top: 12px; padding: 10px 14px; border-radius: 8px; background: #10291c; color: #7ee0ab; border: 1px solid #2f7d4b; font-size: .95rem; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--border); margin: 4px; text-decoration: none; color: var(--text); font-size: .86rem; }
.chip:hover { border-color: var(--accent); }
.chip.locked { color: var(--muted); }
.chip.new { border-color: #3a6ea5; }
.chip.learning { border-color: #8a6d2a; }
.chip.fluent { border-color: #2f7d4b; color: #7ee0ab; }
.chip .due { background: var(--accent); color: #0f1115; border-radius: 999px; padding: 0 7px; font-weight: 700; }
.axis h2 { margin: 1.4rem 0 .5rem; font-size: 1.05rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
table.stats { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: .92rem; }
table.stats th, table.stats td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); }
table.stats td.ok { color: #7ee0ab; }
table.stats td.bad { color: #f0a6b2; }
.lesson-item { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.lesson-item .title { flex: 1; }
.lesson-item a { color: var(--accent); text-decoration: none; }
.lesson-item a:hover { text-decoration: underline; }
.badge { font-size: .72rem; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); }
.badge.studied { color: #7ee0ab; border-color: #2f7d4b; }