:root {
  --ink: #1c1915;
  --ink-soft: #4a433a;
  --paper: #f4efe6;
  --paper-2: #ebe4d6;
  --cream: #faf7f1;
  --white: #fffdf8;
  --line: #ddd4c4;
  --gold: #b56a2b;
  --gold-2: #8c4e1c;
  --navy: #243044;
  --navy-2: #1a2433;
  --sage: #3d5a4c;
  --rose: #8b3a3a;
  --ok: #2f6b4f;
  --warn: #9a6b1f;
  --shadow: 0 18px 50px rgba(28, 25, 21, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
  --sans: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
}

a { color: inherit; }
button, input, select, textarea { font-family: inherit; }

.app { display: none; min-height: 100vh; }
.app.visible { display: grid; grid-template-columns: 260px 1fr; }

/* LOGIN */
.login-wrap {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
}
.login-brand {
  background: var(--navy-2);
  color: var(--cream);
  padding: 64px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.login-brand h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 56px;
  line-height: 0.95;
  margin: 0 0 16px;
}
.login-brand .slogan {
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
  color: #d7b48a;
}
.login-brand p.lead {
  max-width: 420px;
  color: #c9c0b3;
  font-size: 18px;
  line-height: 1.5;
}
.login-panel {
  padding: 64px 56px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--cream);
}
.login-panel h2 { font-family: var(--serif); font-size: 32px; margin: 0 0 8px; }
.login-panel .hint { color: var(--ink-soft); margin-bottom: 28px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 6px; color: var(--ink-soft); }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 12px 14px;
  font-size: 15px;
  color: var(--ink);
}
.btn {
  border: 0;
  cursor: pointer;
  padding: 12px 18px;
  background: var(--navy);
  color: var(--cream);
  letter-spacing: 0.04em;
}
.btn:hover { background: var(--navy-2); }
.btn.gold { background: var(--gold); color: #fff; }
.btn.gold:hover { background: var(--gold-2); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.small { padding: 8px 12px; font-size: 13px; }
.demo-roles { display: grid; gap: 10px; margin-top: 18px; }
.role-card {
  border: 1px solid var(--line);
  padding: 14px;
  background: var(--white);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.role-card:hover { border-color: var(--gold); }
.role-card b { display: block; }
.role-card span { color: var(--ink-soft); font-size: 13px; }

/* SHELL */
.sidebar {
  background: var(--navy-2);
  color: #efe8dc;
  padding: 28px 18px;
  display: flex;
  flex-direction: column;
}
.brand-mark { font-family: var(--serif); font-size: 28px; margin: 0; }
.brand-mark small { display: block; font-family: var(--sans); letter-spacing: 0.16em; text-transform: uppercase; font-size: 10px; color: #d7b48a; margin-top: 6px; }
nav { margin-top: 36px; display: grid; gap: 4px; }
nav button {
  text-align: left;
  background: transparent;
  color: #cfc6b8;
  border: 0;
  padding: 10px 12px;
  cursor: pointer;
}
nav button.active, nav button:hover { background: rgba(255,255,255,0.06); color: #fff; }
.sidebar .who { margin-top: auto; font-size: 13px; color: #b7aea0; padding: 12px; border-top: 1px solid rgba(255,255,255,0.08); }
.main { padding: 32px 40px 64px; }
.topbar { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 28px; gap: 16px; }
.topbar h2 { font-family: var(--serif); font-size: 34px; margin: 0; font-weight: 500; }
.topbar p { margin: 6px 0 0; color: var(--ink-soft); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 16px; }
.cards { display: grid; gap: 12px; }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 18px;
  box-shadow: var(--shadow);
}
.stat { font-family: var(--serif); font-size: 32px; margin: 0; }
.muted { color: var(--ink-soft); font-size: 13px; }
.tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 3px 8px;
  color: var(--ink-soft);
}
.tag.ok { color: var(--ok); border-color: #c9e0d3; background: #f1f7f3; }
.tag.warn { color: var(--warn); border-color: #ead9b3; background: #fbf6ea; }
.tag.late { color: var(--rose); border-color: #e6cfcf; background: #faf2f2; }
.tag.gold { color: var(--gold-2); border-color: #e6d0b6; background: #f8f0e6; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); padding: 8px 10px; border-bottom: 1px solid var(--line); }
td { padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }

.lesson-now {
  background: var(--navy);
  color: var(--cream);
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
}
.lesson-now h3 { font-family: var(--serif); font-size: 28px; margin: 0 0 6px; font-weight: 500; }
.lesson-now p { margin: 0; color: #c9c0b3; }

.list-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.hidden { display: none !important; }
.stack { display: grid; gap: 12px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.exercise q { font-family: var(--serif); font-size: 20px; display: block; margin: 8px 0 16px; }
.feedback {
  background: #f3eee4;
  border-left: 3px solid var(--gold);
  padding: 14px 16px;
  margin-top: 12px;
}
.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--navy); color: #fff; display: grid; place-items: center;
  font-size: 12px; letter-spacing: 0.04em;
}
.modal-bg {
  position: fixed; inset: 0; background: rgba(28,25,21,.45);
  display: grid; place-items: center; z-index: 20; padding: 20px;
}
.modal { max-width: 480px; width: 100%; }
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--navy); color: #fff; padding: 12px 16px;
  opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 30;
}
.toast.show { opacity: 1; }
.script {
  margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-soft);
}
.script ol { padding-left: 18px; }

@media (max-width: 980px) {
  .login-wrap, .app.visible, .grid-3, .grid-2, .lesson-now { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main { padding: 20px; }
}