/* ===== ARKTIS-7 Theme ===== */
:root {
  --bg: #0b1422;
  --bg-panel: #111e31;
  --bg-panel-2: #16263e;
  --border: #24385a;
  --text: #dce8f5;
  --text-dim: #8aa3c0;
  --accent: #4dd8ff;
  --accent-2: #7af0c5;
  --warn: #ffb454;
  --error: #ff6b7a;
  --ok: #51d88a;
  --frost: #9db7ff;
  --kai: #7af0c5;
  --tomas: #ffb454;
  --mono: "SF Mono", "Fira Code", Consolas, Menlo, monospace;
  --sans: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--accent); }
code, pre { font-family: var(--mono); }

/* ---- Boot / Login / Onboarding ---- */
.boot-screen, .gate {
  min-height: 100vh;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 18px; padding: 24px; text-align: center;
  background:
    radial-gradient(ellipse at 20% -10%, #16314f 0%, transparent 55%),
    radial-gradient(ellipse at 90% 110%, #0f2c3d 0%, transparent 50%),
    var(--bg);
}
.boot-logo { font-size: 44px; font-weight: 800; letter-spacing: 3px; }
.boot-msg { color: var(--text-dim); font-family: var(--mono); animation: blink 1.4s infinite; }
@keyframes blink { 50% { opacity: .35; } }

.gate-card {
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 36px 40px; max-width: 620px; width: 100%;
  text-align: left; box-shadow: 0 18px 60px rgba(0,0,0,.45);
}
.gate-card h1 { margin: 0 0 4px; font-size: 30px; letter-spacing: 2px; }
.gate-card .sub { color: var(--text-dim); margin-bottom: 22px; font-family: var(--mono); font-size: 13px; }
.gate-card p { color: var(--text); }
.gate-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 22px; }

.btn {
  font-family: var(--sans); font-size: 15px; font-weight: 600;
  border-radius: 9px; border: 1px solid var(--border);
  background: var(--bg-panel-2); color: var(--text);
  padding: 11px 20px; cursor: pointer; transition: all .15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); color: #062234; border-color: var(--accent); }
.btn.primary:hover { background: #7ce2ff; color: #062234; }
.btn.ghost { background: transparent; }
.btn.small { padding: 6px 14px; font-size: 13px; }

input.codename, .cloze-gap {
  font-family: var(--mono); font-size: 15px;
  background: #0a1320; color: var(--accent-2);
  border: 1px solid var(--border); border-radius: 7px;
  padding: 9px 12px; outline: none;
}
input.codename:focus, .cloze-gap:focus { border-color: var(--accent); }
input.codename { width: 100%; margin-top: 6px; }

/* ---- Layout ---- */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 300px; flex-shrink: 0;
  background: var(--bg-panel); border-right: 1px solid var(--border);
  padding: 18px 14px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.side-head { padding: 4px 8px 14px; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.side-head .logo { font-weight: 800; font-size: 19px; letter-spacing: 2px; }
.side-head .agent { font-family: var(--mono); font-size: 12.5px; color: var(--accent-2); margin-top: 4px; }
.side-head .mode { font-size: 11.5px; color: var(--text-dim); margin-top: 2px; }
.side-head .logout { margin-top: 8px; }

.unit-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 9px; cursor: pointer;
  color: var(--text-dim); font-size: 14px; border: 1px solid transparent;
}
.unit-item:hover { background: var(--bg-panel-2); }
.unit-item.active { background: var(--bg-panel-2); color: var(--text); border-color: var(--border); }
.unit-item.locked { opacity: .45; cursor: not-allowed; }
.unit-item .u-icon { width: 26px; text-align: center; }
.unit-item .u-title { flex: 1; }
.unit-item .u-num { font-family: var(--mono); font-size: 11px; color: var(--text-dim); }

.main { flex: 1; min-width: 0; padding: 28px clamp(18px, 5vw, 64px) 80px; max-width: 1100px; }

.unit-header { margin-bottom: 8px; }
.unit-header .kicker { font-family: var(--mono); font-size: 12.5px; color: var(--accent); letter-spacing: 1.5px; text-transform: uppercase; }
.unit-header h1 { margin: 4px 0 2px; font-size: 30px; }
.unit-header .subtitle { color: var(--text-dim); }

.stepbar { display: flex; gap: 6px; margin: 18px 0 26px; flex-wrap: wrap; }
.stepdot {
  height: 8px; border-radius: 6px; flex: 1; min-width: 26px;
  background: var(--bg-panel-2); border: 1px solid var(--border); cursor: pointer;
}
.stepdot.done { background: var(--accent-2); border-color: var(--accent-2); }
.stepdot.current { background: var(--accent); border-color: var(--accent); }

/* ---- Content ---- */
.step-panel { background: var(--bg-panel); border: 1px solid var(--border); border-radius: 14px; padding: 28px 32px; }
.step-kind { font-family: var(--mono); font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text-dim); margin-bottom: 14px; }

.md h2 { font-size: 22px; margin: 26px 0 8px; color: #fff; }
.md h3 { font-size: 17px; margin: 22px 0 6px; color: var(--accent); }
.md p { margin: 10px 0; }
.md ul, .md ol { padding-left: 24px; }
.md code { background: #0a1320; border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; font-size: 13.5px; color: var(--accent-2); }
.md pre { background: #0a1320; border: 1px solid var(--border); border-radius: 9px; padding: 14px 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; }
.md pre code { background: none; border: none; padding: 0; color: #cfe3ff; }
.md table { border-collapse: collapse; margin: 12px 0; font-size: 14px; }
.md th, .md td { border: 1px solid var(--border); padding: 6px 12px; }
.md th { background: var(--bg-panel-2); }
.md blockquote { border-left: 3px solid var(--accent); margin: 12px 0; padding: 2px 16px; color: var(--text-dim); background: rgba(77,216,255,.05); border-radius: 0 8px 8px 0; }
.md strong { color: #fff; }

/* ---- Dialog bubbles ---- */
.dialog { display: flex; gap: 12px; margin: 16px 0; }
.dialog .avatar { font-size: 26px; flex-shrink: 0; width: 42px; height: 42px; display: flex; align-items: center; justify-content: center; background: var(--bg-panel-2); border-radius: 50%; border: 1px solid var(--border); }
.dialog .bubble { background: var(--bg-panel-2); border: 1px solid var(--border); border-radius: 4px 14px 14px 14px; padding: 10px 16px; flex: 1; }
.dialog .who { font-size: 12px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 3px; }
.dialog.frost .who { color: var(--frost); }
.dialog.kai .who { color: var(--kai); }
.dialog.tomas .who { color: var(--tomas); }
.dialog.frost .bubble { border-left: 3px solid var(--frost); }
.dialog.kai .bubble { border-left: 3px solid var(--kai); }
.dialog.tomas .bubble { border-left: 3px solid var(--tomas); }
.dialog .bubble p:first-child { margin-top: 2px; }
.dialog .bubble p:last-child { margin-bottom: 2px; }

/* ---- Code step ---- */
.CodeMirror { height: auto; min-height: 120px; border: 1px solid var(--border); border-radius: 9px; font-size: 14px; font-family: var(--mono); padding: 6px 0; }
.code-toolbar { display: flex; gap: 10px; margin: 12px 0; align-items: center; flex-wrap: wrap; }
.py-status { font-family: var(--mono); font-size: 12.5px; color: var(--text-dim); }
.output {
  background: #060d17; border: 1px solid var(--border); border-radius: 9px;
  padding: 12px 16px; font-family: var(--mono); font-size: 13.5px;
  white-space: pre-wrap; word-break: break-word; min-height: 20px; margin-top: 4px;
}
.output .err { color: var(--error); }
.output img { max-width: 100%; background: #fff; border-radius: 6px; margin-top: 8px; }
.feedback { border-radius: 9px; padding: 12px 16px; margin-top: 12px; font-size: 14.5px; display: flex; gap: 10px; align-items: flex-start; }
.feedback.ok { background: rgba(81,216,138,.1); border: 1px solid var(--ok); }
.feedback.fail { background: rgba(255,107,122,.08); border: 1px solid var(--error); }
.hint-box { margin-top: 12px; }
.hint { background: rgba(122,240,197,.07); border: 1px dashed var(--kai); border-radius: 9px; padding: 10px 16px; margin-top: 8px; font-size: 14px; }
.hint::before { content: "🤖 KAI: "; font-weight: 700; color: var(--kai); }

/* ---- Cloze ---- */
.cloze-text { font-size: 15.5px; line-height: 2.3; }
.cloze-text pre { line-height: 2.0; }
.cloze-gap { width: 130px; padding: 4px 9px; font-size: 14px; text-align: center; }
.cloze-gap.ok { border-color: var(--ok); color: var(--ok); }
.cloze-gap.fail { border-color: var(--error); color: var(--error); }

/* ---- Quiz ---- */
.quiz-q { margin-bottom: 26px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.quiz-q h3 { margin: 0 0 12px; font-size: 16.5px; }
.quiz-opt {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 10px 14px; margin: 7px 0; border: 1px solid var(--border);
  border-radius: 9px; cursor: pointer; transition: border-color .15s;
}
.quiz-opt:hover { border-color: var(--accent); }
.quiz-opt input { margin-top: 4px; accent-color: var(--accent); }
.quiz-opt.right { border-color: var(--ok); background: rgba(81,216,138,.08); }
.quiz-opt.wrong { border-color: var(--error); background: rgba(255,107,122,.06); }
.quiz-fb { font-size: 13.5px; margin-top: 8px; padding: 8px 12px; border-radius: 7px; }
.quiz-fb.ok { color: var(--ok); background: rgba(81,216,138,.08); }
.quiz-fb.fail { color: var(--warn); background: rgba(255,180,84,.08); }

/* ---- Navigation ---- */
.step-nav { display: flex; justify-content: space-between; margin-top: 22px; gap: 12px; }
.badge { display: inline-block; font-family: var(--mono); font-size: 11.5px; padding: 2px 10px; border-radius: 20px; border: 1px solid var(--accent-2); color: var(--accent-2); margin-left: 10px; vertical-align: middle; }

.unit-done-banner {
  background: linear-gradient(135deg, rgba(122,240,197,.12), rgba(77,216,255,.10));
  border: 1px solid var(--accent-2); border-radius: 12px;
  padding: 18px 24px; margin-top: 20px; font-size: 15px;
}

@media (max-width: 860px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; }
  .step-panel { padding: 20px 18px; }
}