/* GoNorah — editorial "index" style.
   Cream paper, ink rules, big display serif, warm pink/orange accents. */

:root {
  --paper: #f6efe3;
  --card: #fbf6ec;
  --ink: #211d18;
  --muted: #7c7364;
  --line: #211d18;
  --line-soft: #d9cfbc;
  --accent: #d92662;      /* hot pink */
  --accent-ink: #fbf6ec;
  --accent-soft: #f7d9e3;
  --orange: #e86a2b;
  --orange-soft: #f8e2d2;
  --green: #2f7d4f;
  --green-soft: #ddecd9;
  --danger: #c33f2e;
  --danger-soft: #f5ddd7;
  --shadow: 4px 4px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #191511;
    --card: #211c16;
    --ink: #f1e8d8;
    --muted: #a99c87;
    --line: #f1e8d8;
    --line-soft: #453c30;
    --accent: #f0568c;
    --accent-ink: #191511;
    --accent-soft: #47222f;
    --orange: #ef8547;
    --orange-soft: #462c1a;
    --green: #6fbb8b;
    --green-soft: #22352a;
    --danger: #e26a58;
    --danger-soft: #3f231e;
    --shadow: 4px 4px 0 rgba(241, 232, 216, 0.9);
    --shadow-sm: 3px 3px 0 rgba(241, 232, 216, 0.9);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

#app { min-height: 100vh; display: flex; flex-direction: column; }

.math {
  font-family: 'STIX Two Text', 'Times New Roman', serif;
  font-size: 1.1em;
}

button { font-family: inherit; }

.display, .logo, .hello, .unit-title, .feedback h3, .auth-card h1 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  letter-spacing: 0;
}

/* small uppercase label style used across chips/tags */
.label-caps {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------- header ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px 10px;
  background: var(--paper);
  border-bottom: 2px solid var(--line);
  box-shadow: 0 4px 0 -2px var(--paper), 0 6px 0 -2px var(--line); /* double rule */
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}
.logo span { color: var(--accent); font-style: italic; }

.topbar-right { display: flex; align-items: center; gap: 12px; }

.streak-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--orange-soft);
  color: var(--ink);
  border: 1.5px solid var(--line);
  font-weight: 700;
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.85rem;
}

.avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  overflow: hidden;
  border: 1.5px solid var(--line);
  cursor: pointer;
  font-size: 0.9rem;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }

.menu {
  position: absolute;
  right: 16px;
  top: 62px;
  background: var(--card);
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow-sm);
  padding: 8px;
  min-width: 190px;
}
.menu .who { padding: 8px 10px; font-size: 0.82rem; color: var(--muted); border-bottom: 1px solid var(--line-soft); margin-bottom: 6px; word-break: break-all; }
.menu button {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 9px 10px;
  cursor: pointer;
  color: var(--ink);
  font-size: 0.95rem;
}
.menu button:hover { background: var(--accent); color: var(--accent-ink); }

/* ---------- layout ---------- */

.page {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 26px 16px 80px;
  flex: 1;
}

.tabs { display: flex; gap: 10px; margin-bottom: 22px; }
.tab {
  flex: 1;
  padding: 10px;
  border: 1.5px solid var(--line);
  background: var(--card);
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  box-shadow: var(--shadow-sm);
  transition: transform 0.06s ease, box-shadow 0.06s ease;
}
.tab:hover { transform: translate(-1px, -1px); }
.tab.active {
  background: var(--ink);
  color: var(--paper);
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--ink);
}

.card {
  background: var(--card);
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

/* ---------- auth ---------- */

.auth-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}
.auth-card { width: 100%; max-width: 420px; text-align: center; }
.auth-card h1 { font-size: 3.2rem; margin: 0; line-height: 1; color: var(--ink); }
.auth-card h1 span { color: var(--accent); font-style: italic; }
.auth-card .tagline {
  color: var(--muted);
  margin: 10px 0 24px;
  font-size: 0.95rem;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 8px 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1.5px solid var(--line);
  border-radius: 0;
  padding: 12px 20px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.06s ease, box-shadow 0.06s ease;
  text-decoration: none;
}
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn-primary { background: var(--accent); color: var(--accent-ink); width: 100%; }
.btn-google { background: var(--card); color: var(--ink); width: 100%; margin-bottom: 14px; }
.btn-accent { background: var(--orange); color: var(--paper); }
.btn-ghost {
  background: none;
  border: none;
  box-shadow: none;
  color: var(--accent);
  padding: 8px 10px;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.btn-ghost:hover, .btn-ghost:active { transform: none; box-shadow: none; }

.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 16px 0;
}
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--line-soft); }

.field { text-align: left; margin-bottom: 12px; }
.field label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.field input {
  width: 100%;
  padding: 11px 12px;
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 1rem;
  font-family: inherit;
}
.field input:focus { outline: none; box-shadow: inset 0 0 0 1.5px var(--accent); border-color: var(--accent); }

.form-error { color: var(--danger); font-size: 0.9rem; min-height: 1.3em; margin: 6px 0; }

.auth-toggle { margin-top: 16px; font-size: 0.92rem; color: var(--muted); }
.auth-toggle button {
  background: none;
  border: none;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  font-size: 0.92rem;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- practice ---------- */

.skill-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: -6px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  flex-wrap: wrap;
}
.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.skill-chip::before { content: '§'; color: var(--accent); font-size: 1rem; }
.difficulty { color: var(--orange); font-size: 0.85rem; letter-spacing: 3px; }

.question-text {
  font-size: 1.25rem;
  margin: 4px 0 22px;
  line-height: 1.6;
}

.choices { display: flex; flex-direction: column; gap: 10px; }
.choice {
  text-align: left;
  padding: 13px 16px;
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 1.05rem;
  cursor: pointer;
  transition: background 0.1s ease, color 0.1s ease, transform 0.06s ease;
}
.choice:hover { background: var(--accent-soft); }
.choice.selected { background: var(--ink); color: var(--paper); }
.choice.correct { background: var(--green-soft); border-color: var(--green); box-shadow: inset 0 0 0 1px var(--green); color: var(--ink); }
.choice.wrong { background: var(--danger-soft); border-color: var(--danger); box-shadow: inset 0 0 0 1px var(--danger); color: var(--ink); }

.answer-inputs { display: flex; flex-direction: column; gap: 10px; margin-bottom: 6px; }
.answer-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.answer-row label { font-weight: 700; color: var(--muted); min-width: 40px; font-size: 0.9rem; }
.answer-row input {
  flex: 1;
  min-width: 140px;
  padding: 12px 14px;
  font-size: 1.1rem;
  border: 1.5px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}
.answer-row input:focus { outline: none; box-shadow: inset 0 0 0 1.5px var(--accent); border-color: var(--accent); }
.input-help { color: var(--muted); font-size: 0.82rem; margin: 2px 0 0; font-style: italic; }

.practice-actions { display: flex; gap: 12px; margin-top: 20px; align-items: center; flex-wrap: wrap; }

.hint-box {
  margin-top: 14px;
  background: var(--orange-soft);
  color: var(--ink);
  border: 1.5px solid var(--line);
  border-left: 6px solid var(--orange);
  padding: 10px 14px;
  font-size: 0.95rem;
}

/* feedback */
.feedback { border-left: 6px solid var(--green); }
.feedback.bad { border-left-color: var(--accent); }
.feedback h3 { margin: 0 0 8px; font-size: 1.9rem; line-height: 1.1; }
.feedback h3.good { color: var(--green); }
.feedback h3.bad { color: var(--accent); font-style: italic; }
.feedback .answer-reveal { font-weight: 700; margin: 6px 0 12px; }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin-bottom: 8px; }
.steps li::marker { color: var(--accent); font-weight: 700; }
.mastery-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  background: var(--green-soft);
  color: var(--ink);
  border: 1.5px solid var(--line);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.82rem;
}
.feedback.bad .mastery-note { background: var(--accent-soft); }

/* ---------- progress ---------- */

.hello { font-size: 2.4rem; margin: 0 0 2px; line-height: 1.1; }
.sub { color: var(--muted); margin: 0 0 20px; font-style: italic; }

.focus-card {
  background: var(--accent);
  color: var(--accent-ink);
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  margin-bottom: 20px;
}
.focus-card p { margin: 0 0 14px; font-size: 1.15rem; font-family: 'Instrument Serif', Georgia, serif; }
.focus-card .btn { background: var(--paper); color: var(--ink); }

.stat-row { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.stat {
  flex: 1;
  min-width: 90px;
  background: var(--card);
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow-sm);
  text-align: center;
  padding: 14px 8px 10px;
}
.stat .num { font-family: 'Instrument Serif', Georgia, serif; font-size: 1.9rem; line-height: 1; color: var(--ink); }
.stat .lbl {
  font-size: 0.66rem;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 4px;
}

.unit-title {
  font-size: 1.8rem;
  margin: 28px 0 2px;
  padding-top: 14px;
  border-top: 2px solid var(--line);
}
.unit-desc { color: var(--muted); font-size: 0.9rem; margin: 0 0 14px; font-style: italic; }

.skill-row {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1.5px solid var(--line);
  padding: 14px 16px;
  margin: 0 0 -1.5px 0; /* collapse borders like index rows */
  cursor: pointer;
  width: 100%;
  text-align: left;
  color: var(--ink);
  font-family: inherit;
  font-size: inherit;
  transition: background 0.1s ease;
  position: relative;
}
.skill-row:hover { background: var(--accent-soft); z-index: 1; }
.skill-row.locked { cursor: default; background: var(--paper); color: var(--muted); }
.skill-row.locked:hover { background: var(--paper); }
.skill-row.locked .skill-name, .skill-row.locked .section-tag { color: var(--muted); }

.skill-info { flex: 1; min-width: 0; }
.skill-name { font-weight: 700; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.section-tag {
  font-family: 'Instrument Serif', Georgia, serif;
  font-weight: 400;
  color: var(--accent);
  font-size: 1.15rem;
  min-width: 2.4em;
}
.skill-blurb { color: var(--muted); font-size: 0.85rem; margin-top: 2px; }

.bar {
  height: 10px;
  background: var(--paper);
  border: 1px solid var(--line);
  margin-top: 9px;
  overflow: hidden;
}
.bar > div {
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    var(--accent),
    var(--accent) 6px,
    var(--orange) 6px,
    var(--orange) 12px
  );
  transition: width 0.5s ease;
}
.skill-row.locked .bar { border-color: var(--line-soft); }

.badge {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}
.badge.mastered { background: var(--green-soft); color: var(--ink); }
.badge.locked { background: var(--paper); color: var(--muted); border-color: var(--line-soft); }

.loading {
  text-align: center;
  color: var(--muted);
  padding: 48px 0;
  font-style: italic;
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 1.2rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 20px;
  border-top: 2px solid var(--line);
}

@media (max-width: 480px) {
  .page { padding: 18px 12px 64px; }
  .card { padding: 18px 16px; }
  .question-text { font-size: 1.12rem; }
  .logo { font-size: 1.6rem; }
  .hello { font-size: 2rem; }
}