:root {
  --paper: #f3f5ef;
  --surface: #ffffff;
  --ink: #17322a;
  --muted: #56695f;
  --line: #d3dbd1;
  --marker: #f2dc3b;
  --marker-ink: #17322a;
  --alert: #a8321f;
  --focus: #2f6fd6;
  --display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1f1a;
    --surface: #172b24;
    --ink: #e6ece4;
    --muted: #a0b3a9;
    --line: #2b4439;
    --marker: #e3cf36;
    --alert: #f08a76;
    --focus: #8db4ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.6 var(--body);
}
a { color: inherit; text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: 70rem; margin: 0 auto; padding: 0 1.25rem; }
.narrow { max-width: 42rem; }

/* Header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; }
.wordmark { font: 700 1.15rem/1 var(--display); text-decoration: none; letter-spacing: -0.01em; }
.top nav { display: flex; align-items: center; gap: 1.25rem; font-size: 0.95rem; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 3rem; padding: 0 1.4rem; border-radius: 999px; border: 2px solid var(--ink);
  background: var(--ink); color: var(--paper); font: 700 1rem/1 var(--body);
  text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.15); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.marker { background: var(--marker); border-color: var(--marker); color: var(--marker-ink); }
.btn.small { min-height: 2.4rem; padding: 0 1rem; font-size: 0.92rem; }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }
.linkish { background: none; border: 0; padding: 0; color: inherit; font: inherit; text-decoration: underline; cursor: pointer; }

/* Highlighter: the one memorable thing */
.hl {
  background-image: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  box-decoration-break: clone; -webkit-box-decoration-break: clone;
}
.hl.sweep { animation: sweep 0.9s cubic-bezier(.6,.1,.2,1) both; }
@keyframes sweep { from { background-size: 0% 100%; } to { background-size: 100% 100%; } }
@media (prefers-color-scheme: dark) { .hl { color: var(--ink); background-image: linear-gradient(transparent 62%, rgba(227,207,54,.55) 62%, rgba(227,207,54,.55) 92%, transparent 92%); } }

/* Hero */
.hero { padding: 3.5rem 0 4rem; }
.question {
  font: 750 clamp(2.4rem, 6.5vw, 5.2rem)/1.04 var(--display);
  letter-spacing: -0.03em; margin: 0 0 1.75rem; max-width: 20ch; min-height: 2.15em;
}
.lede { font-size: 1.25rem; max-width: 36rem; margin: 0 0 2rem; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
.fine { font-size: 0.9rem; color: var(--muted); margin-top: 1rem; }

/* Sections */
section { padding: 3.5rem 0; border-top: 1px solid var(--line); }
h2 { font: 700 clamp(1.6rem, 3.4vw, 2.3rem)/1.15 var(--display); letter-spacing: -0.02em; margin: 0 0 1.5rem; }
h3 { font: 700 1.2rem/1.3 var(--display); margin: 0 0 0.4rem; }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); counter-reset: s; }
.steps li { counter-increment: s; }
.steps li::before { content: counter(s); display: block; font: 800 2.6rem/1 var(--display); margin-bottom: 0.6rem; color: var(--muted); }
.steps p { margin: 0; color: var(--muted); }

.subjects { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.subjects li { padding: 1rem 0; border-bottom: 1px solid var(--line); }
.subjects strong { display: block; font-family: var(--display); font-size: 1.1rem; }
.subjects span { font-size: 0.92rem; color: var(--muted); }

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 1.25rem; }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 1.75rem; display: flex; flex-direction: column; gap: 1rem; }
.plan.full { border: 2px solid var(--ink); }
.price { font: 800 2.8rem/1 var(--display); letter-spacing: -0.02em; }
.price small { font: 400 1rem var(--body); color: var(--muted); }
.plan ul { margin: 0; padding-left: 1.2rem; }
.plan li { margin-bottom: 0.35rem; }
.plan .btn { margin-top: auto; }

details { border-bottom: 1px solid var(--line); padding: 1rem 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 0.6rem 0 0; color: var(--muted); }

footer { padding: 2.5rem 0 3rem; font-size: 0.9rem; color: var(--muted); border-top: 1px solid var(--line); }
footer a { margin-right: 1rem; }

/* App */
.pill { font-size: 0.85rem; padding: 0.3rem 0.75rem; border-radius: 999px; border: 1px solid var(--line); white-space: nowrap; }
.pill.full { background: var(--marker); border-color: var(--marker); color: var(--marker-ink); font-weight: 700; }
.view[hidden] { display: none !important; }
.picker { padding-top: 2rem; padding-bottom: 4rem; }
.picker h1 { font: 750 clamp(2rem, 5vw, 3.2rem)/1.08 var(--display); letter-spacing: -0.02em; margin: 0 0 0.75rem; }
.subject-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 0.75rem; margin: 2rem 0; }
.subject-btn {
  text-align: left; background: var(--surface); color: var(--ink); border: 2px solid var(--line);
  border-radius: 14px; padding: 1rem 1.1rem; cursor: pointer; font: inherit;
}
.subject-btn strong { display: block; font: 700 1.1rem/1.3 var(--display); }
.subject-btn span { font-size: 0.9rem; color: var(--muted); }
.subject-btn[aria-pressed="true"] { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.checks { color: var(--muted); font-size: 0.95rem; }

.room { display: grid; grid-template-rows: auto 1fr auto; height: calc(100dvh - 4.5rem); max-width: 46rem; margin: 0 auto; padding: 0 1.25rem; }
.room-bar { display: flex; align-items: center; gap: 0.75rem; justify-content: space-between; padding: 0.5rem 0 0.9rem; border-bottom: 1px solid var(--line); }
.room-bar .tutor { min-width: 0; flex: 1; }
.room-bar .timer { font: 700 1.05rem var(--display); font-variant-numeric: tabular-nums; }
.tutor { display: flex; align-items: center; gap: 0.75rem; }
.orb { width: 2.4rem; height: 2.4rem; border-radius: 50%; background: var(--marker); flex: none; }
.orb.speaking { animation: pulse 1.1s ease-in-out infinite; }
.orb.thinking { opacity: 0.45; }
@keyframes pulse { 50% { transform: scale(1.18); } }
.log { overflow-y: auto; padding: 1.25rem 0; display: flex; flex-direction: column; gap: 1rem; }
.msg { max-width: 88%; padding: 0.8rem 1rem; border-radius: 16px; }
.msg.assistant { background: var(--surface); border: 1px solid var(--line); align-self: flex-start; border-top-left-radius: 4px; }
.msg.user { background: var(--ink); color: var(--paper); align-self: flex-end; border-top-right-radius: 4px; }
.msg.note { align-self: center; background: none; color: var(--muted); font-size: 0.9rem; text-align: center; }
.composer { padding: 0.75rem 0 1rem; border-top: 1px solid var(--line); display: grid; gap: 0.6rem; }
.composer textarea {
  width: 100%; min-height: 3.2rem; max-height: 9rem; resize: vertical; padding: 0.75rem 0.9rem;
  border-radius: 12px; border: 2px solid var(--line); background: var(--surface); color: var(--ink); font: inherit;
}
.composer-row { display: flex; gap: 0.6rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.mic { min-width: 9.5rem; }
.mic.live { background: var(--alert); border-color: var(--alert); color: #fff; }
.status { font-size: 0.88rem; color: var(--muted); min-height: 1.3em; }

.report { padding-top: 2rem; padding-bottom: 4rem; }
.report h1 { font: 750 clamp(1.9rem, 4.5vw, 2.8rem)/1.1 var(--display); margin: 0 0 1rem; }
.overall { font-size: 1.2rem; }
.scores { display: grid; gap: 0.6rem; margin: 1.5rem 0 2rem; }
.score { display: grid; grid-template-columns: 9.5rem 1fr 2rem; align-items: center; gap: 0.75rem; font-size: 0.95rem; }
.bar { height: 0.7rem; border-radius: 99px; background: var(--line); overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--ink); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.15rem; margin-bottom: 0.75rem; }
.card q { color: var(--muted); }
.locked { position: relative; border: 2px dashed var(--line); border-radius: 14px; padding: 1.5rem; margin: 1.5rem 0; }
.locked p { margin: 0 0 1rem; }

.banner { background: var(--surface); border: 2px solid var(--alert); color: var(--ink); border-radius: 12px; padding: 0.75rem 1rem; margin: 1rem 0; }
dialog { border: 0; border-radius: 18px; padding: 1.75rem; max-width: 26rem; width: calc(100% - 2rem); background: var(--surface); color: var(--ink); }
dialog::backdrop { background: rgba(10, 25, 20, 0.55); }
dialog h2 { font-size: 1.6rem; margin-bottom: 0.75rem; }
dialog input { width: 100%; padding: 0.75rem; border-radius: 10px; border: 2px solid var(--line); background: var(--paper); color: var(--ink); font: inherit; margin: 0.5rem 0 1rem; }
.access-link { word-break: break-all; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 0.75rem; font-size: 0.9rem; }

@media (max-width: 560px) {
  .top nav .hide-sm { display: none; }
  .score { grid-template-columns: 7.5rem 1fr 1.5rem; }
  .msg { max-width: 94%; }
}
@media (prefers-reduced-motion: reduce) {
  .hl.sweep, .orb.speaking { animation: none; }
}
.picker > .actions { position: sticky; bottom: 0; background: var(--paper); padding: 0.75rem 0 1rem; border-top: 1px solid var(--line); }
.consent { display: flex; gap: 0.6rem; align-items: flex-start; font-size: 0.92rem; color: var(--muted); margin: 0 0 1rem; }
.consent input { width: 1.2rem; height: 1.2rem; padding: 0; margin: 0.15rem 0 0; flex: none; accent-color: var(--ink); }
.banner.ok { border-color: var(--ink); background: var(--marker); color: var(--marker-ink); }
.access-card p { margin: 0.4rem 0 0.8rem; color: var(--muted); font-size: 0.95rem; }
.access-card .access-link { font-weight: 700; }