:root {
  color-scheme: light;
  --ink: #111936; --ink-2: #273252; --paper: #fff; --canvas: #eef2f8;
  --mint: #7be7c4; --orange: #ff8050; --blue: #4e65ef; --blue-2: #3246bd;
  --red: #c94555; --green: #16795f; --line: #dbe2ef; --muted: #63708c;
  --shadow: 0 18px 48px rgba(20,33,66,.09);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--canvas); color: var(--ink); min-height: 100vh; }
button, input, select { font: inherit; }
button:disabled { cursor: not-allowed; opacity: .55; }
select:focus-visible,summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 3px solid rgba(78,101,239,.3); outline-offset: 2px; }
.topbar { min-height: 76px; padding: 0 max(20px,5vw); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; background: var(--ink); color: #fff; position: sticky; top: 0; z-index: 10; }
.brand { appearance: none; border: 0; background: transparent; color: inherit; display: flex; align-items: center; gap: .75rem; padding: 0; font-weight: 800; letter-spacing: -.02em; justify-self: start; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; position: relative; color: var(--mint); border: 2px solid currentColor; border-radius: 11px; }
.brand-mark span { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: var(--orange); right: -4px; bottom: -3px; }
.nav { display: flex; background: rgba(255,255,255,.08); border-radius: 12px; padding: 4px; }
.nav button { color: #c8d0e4; border: 0; background: transparent; border-radius: 9px; padding: 9px 14px; font-weight: 700; font-size: .88rem; }
.nav button.is-active { background: #fff; color: var(--ink); }
.topbar-actions { display: flex; align-items: center; gap: 14px; justify-self: end; }
.countdown { display: flex; align-items: baseline; gap: .55rem; justify-self: end; }
.countdown strong { color: var(--mint); font-size: 1.05rem; }
.countdown span { color: #bac4dd; font-size: .9rem; }
.account-button { border: 1px solid rgba(255,255,255,.23); background: rgba(255,255,255,.08); color: #fff; border-radius: 10px; min-height: 38px; padding: 8px 12px; font-weight: 780; font-size: .8rem; }
.account-button:hover { background: rgba(255,255,255,.15); }
.account-button.is-signed-in { color: var(--mint); border-color: rgba(123,231,196,.42); }
.app-shell { max-width: 1200px; margin: 0 auto; padding: 42px 28px 80px; }
.eyebrow { margin: 0 0 9px; text-transform: uppercase; letter-spacing: .1em; font-size: .75rem; font-weight: 850; color: var(--muted); }
.muted { color: var(--muted); }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.button { border: 0; border-radius: 13px; min-height: 48px; padding: 12px 18px; font-weight: 800; background: var(--blue); color: #fff; transition: .16s ease; }
.button:hover { background: var(--blue-2); transform: translateY(-1px); }
.button.secondary { background: #e9edff; color: #3246bd; }
.button.secondary:hover { background: #dfe5ff; }
.button.ghost { color: var(--ink-2); background: transparent; border: 1px solid var(--line); }
.button.ghost:hover { background: #f6f8fc; }
.button.compact { min-height: 40px; padding: 9px 13px; font-size: .88rem; }
.dashboard-head { margin-bottom: 26px; }
.dashboard-head h1 { margin: 0; font-family: Georgia,"Times New Roman",serif; font-size: clamp(2rem,5vw,3.5rem); line-height: 1.02; letter-spacing: -.045em; max-width: 760px; }
.dashboard-head p:last-child { margin: 12px 0 0; max-width: 670px; line-height: 1.55; color: var(--muted); }
.dashboard-grid { display: grid; grid-template-columns: minmax(0,1.55fr) minmax(260px,.85fr); gap: 24px; align-items: start; }
.plan-card { overflow: hidden; }
.plan-band { padding: 14px 24px; background: var(--ink); color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.plan-band span { color: var(--mint); font-weight: 800; }
.plan-body { padding: clamp(22px,4vw,36px); }
.plan-body h2 { font-family: Georgia,"Times New Roman",serif; font-size: clamp(1.7rem,3vw,2.4rem); margin: 0 0 10px; letter-spacing: -.03em; }
.plan-body > p { margin: 0; color: var(--muted); line-height: 1.55; max-width: 650px; }
.focus-list { display: grid; gap: 9px; margin: 26px 0; padding: 0; list-style: none; }
.focus-list li { display: grid; grid-template-columns: 30px 1fr auto; gap: 12px; align-items: center; padding: 12px 14px; background: #f6f8fc; border-radius: 13px; }
.focus-list .num { width: 27px; height: 27px; display: grid; place-items: center; border-radius: 9px; background: var(--ink); color: var(--mint); font-weight: 850; font-size: .8rem; }
.focus-list li > span:not(.num) strong,.focus-list li > span:not(.num) small { display: block; }
.focus-list li > span:not(.num) small { margin-top: 3px; line-height: 1.35; }
.focus-list small { color: var(--muted); }
.session-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.duration-picker { margin: 25px 0 18px; padding-top: 20px; border-top: 1px solid var(--line); }
.duration-picker > strong,.duration-picker > span { display: block; }
.duration-picker > span { color: var(--muted); font-size: .88rem; margin-top: 4px; }
.time-control { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 5px; margin-top: 12px; background: #edf1f7; border-radius: 14px; padding: 5px; }
.time-control button { display: grid; gap: 2px; border: 0; border-radius: 10px; background: transparent; color: var(--muted); min-height: 52px; padding: 7px 9px; }
.time-control button strong { color: inherit; font-size: .88rem; }
.time-control button small { color: inherit; font-size: .7rem; }
.time-control button.is-active { background: #fff; color: var(--ink); box-shadow: 0 2px 8px rgba(17,25,54,.1); }
.side-stack { display: grid; gap: 18px; }
.side-card { padding: 22px; }
.side-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.side-card p { color: var(--muted); line-height: 1.5; margin: 0 0 18px; font-size: .92rem; }
.practice-card { border-top: 5px solid var(--orange); }
.practice-card .button { width: 100%; }
.timeline { margin: 0; padding: 0; list-style: none; display: grid; gap: 16px; }
.timeline li { display: grid; grid-template-columns: 12px 1fr; gap: 12px; }
.timeline li::before { content: ""; width: 9px; height: 9px; margin-top: 5px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 4px #e4e8ff; }
.timeline strong,.timeline span { display: block; }
.timeline strong { font-size: .88rem; }
.timeline span { font-size: .8rem; color: var(--muted); margin-top: 3px; line-height: 1.4; }
.onboarding-shell { max-width: 830px; margin: 8px auto 0; }
.onboarding-progress { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 0 4px 14px; color: var(--muted); font-size: .84rem; font-weight: 750; }
.onboarding-progress > div { display: flex; gap: 6px; }
.onboarding-progress i { display: block; width: 34px; height: 5px; border-radius: 99px; background: #d6dce8; }
.onboarding-progress i.is-active { background: var(--blue); }
.onboarding-card { position: relative; min-height: 430px; padding: clamp(30px,4vw,42px); overflow: hidden; }
.onboarding-number { position: absolute; right: clamp(22px,5vw,48px); top: clamp(22px,5vw,42px); width: 56px; height: 56px; border-radius: 18px; display: grid; place-items: center; background: var(--ink); color: var(--mint); font-family: Georgia,"Times New Roman",serif; font-size: 1.7rem; }
.onboarding-card h1 { max-width: 620px; margin: 0; padding-right: 65px; font-family: Georgia,"Times New Roman",serif; font-size: clamp(2rem,4vw,2.75rem); line-height: 1.06; letter-spacing: -.04em; }
.onboarding-copy { max-width: 650px; margin: 14px 0 0; color: var(--ink-2); font-size: 1.02rem; line-height: 1.55; }
.onboarding-points { max-width: 680px; margin: 19px 0 24px; padding: 0; list-style: none; display: grid; gap: 8px; }
.onboarding-points li { position: relative; padding: 10px 14px 10px 39px; border-radius: 13px; background: #f3f6fb; line-height: 1.4; }
.onboarding-points li::before { content: "✓"; position: absolute; left: 14px; top: 9px; color: var(--green); font-weight: 900; }
.onboarding-topics { margin: 20px 0 25px; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; }
.onboarding-topics span { display: flex; align-items: center; min-height: 44px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 12px; background: #f7f9fc; color: var(--ink-2); font-size: .88rem; font-weight: 760; }
.onboarding-choices { margin: 18px 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.onboarding-choices section { padding: 15px; border: 1px solid var(--line); border-radius: 14px; background: #f7f9fc; }
.onboarding-choices h2 { margin: 0 0 6px; font-family: inherit; font-size: .94rem; letter-spacing: 0; }
.onboarding-choices p { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.45; }
.onboarding-time-block { margin: 0 0 22px; }
.onboarding-time-block > strong { display: block; margin-bottom: 9px; font-size: .9rem; }
.onboarding-times { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 7px; }
.onboarding-times > span { display: grid; gap: 2px; padding: 9px 10px; border-radius: 11px; background: #eef1ff; text-align: center; }
.onboarding-times strong { color: var(--blue-2); font-size: .88rem; }
.onboarding-times small { color: var(--muted); font-size: .72rem; }
.onboarding-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: auto; }
.session-shell { max-width: 900px; margin: 0 auto; }
.session-top { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 18px; }
.session-progress { flex: 1; }
.progress-track { height: 7px; background: #dbe1ec; border-radius: 999px; overflow: hidden; }
.progress-track span { height: 100%; display: block; background: linear-gradient(90deg,var(--blue),#8a6cff); border-radius: inherit; transition: width .25s ease; }
.progress-copy { display: flex; justify-content: space-between; color: var(--muted); font-size: .78rem; margin-top: 7px; }
.exit-button { border: 0; background: transparent; color: var(--muted); font-weight: 750; padding: 8px; }
.exercise { padding: clamp(22px,5vw,46px); }
.exercise-head { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; }
.topic { display: inline-flex; background: #e9edff; color: #344ac2; padding: 7px 11px; border-radius: 999px; font-weight: 800; font-size: .8rem; }
.level { border: 1px solid var(--line); color: var(--muted); border-radius: 999px; padding: 7px 11px; white-space: nowrap; font-size: .8rem; font-weight: 750; }
.exercise h1 { margin: 15px 0 0; font-family: Georgia,"Times New Roman",serif; font-size: clamp(1.65rem,4vw,2.65rem); line-height: 1.1; letter-spacing: -.035em; max-width: 700px; }
.sentence-card { margin: 30px 0 12px; border-radius: 18px; background: var(--ink); color: #fff; padding: clamp(20px,4vw,30px); }
.sentence-card > p { font-family: Georgia,"Times New Roman",serif; font-size: clamp(1.3rem,3vw,2rem); line-height: 1.5; margin: 0; }
.sentence-card mark { background: transparent; color: var(--mint); border-bottom: 3px solid var(--orange); padding: 0 2px; }
.source { color: var(--muted); font-size: .76rem; margin: 9px 3px 24px; }
.answers { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.answer { text-align: left; min-height: 56px; padding: 14px 16px; border-radius: 14px; border: 1px solid var(--line); background: #fff; color: var(--ink); font-weight: 680; transition: .15s ease; }
.answer:hover:not(:disabled) { border-color: var(--blue); background: #f8f9ff; transform: translateY(-1px); }
.answer:disabled { cursor: default; opacity: .8; }
.answer.correct { border-color: #61bb9f; background: #e9f8f2; color: #0d604a; }
.answer.selected { border: 2px solid var(--blue); background: #eef1ff; }
.ui-icon { width: 21px; height: 21px; flex: 0 0 21px; vertical-align: middle; }
.support-action,.confidence button { display: inline-flex; align-items: center; gap: 8px; }
.confidence-panel { margin-top: 20px; padding: 18px; border: 1px solid #c9d2fb; background: #f4f6ff; border-radius: 16px; }
.confidence-panel p { margin: 0 0 12px; font-weight: 700; }
.confidence-panel small { display: block; margin-top: 12px; line-height: 1.5; color: var(--muted); font-size: .875rem; }
.confidence-panel .confidence { flex-wrap: wrap; }
.confidence-panel .confidence button { min-height: 48px; background: #fff; font-size: 1rem; padding: 12px 15px; }
.confidence button:hover { border-color: var(--blue); background: #eef1ff; }
.help-intro,.practice-note { color: var(--muted); font-size: .94rem; line-height: 1.5; }
.help-intro { margin: 0 0 12px; }
.feedback h3 { display: flex; align-items: center; gap: 9px; }
.feedback details { margin-top: 12px; }
summary { cursor: pointer; font-weight: 700; line-height: 1.5; }
.feedback .reflection { margin-top: 14px; font-size: .94rem; }
.support-panel p + p { margin-top: 12px; }
.support-panel .button { margin-top: 15px; }
.resume-card { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; padding: 20px; margin-bottom: 22px; border-color: #a7dbc9; }
.resume-card p { margin: 5px 0 0; color: var(--muted); line-height: 1.5; }
.worked-example { padding: 24px; margin-bottom: 22px; }
.worked-example h2 { margin-top: 0; font-size: 1.2rem; }
.worked-example .sentence-card { margin-top: 15px; }
.worked-example p { line-height: 1.65; }
.lesson-details { margin: 20px 0; }
.lesson-details > summary { padding: 15px; background: #e9edff; border-radius: 12px; margin-bottom: 15px; }
.onboarding-choices p,.skill-card p { font-size: 1rem; }
.onboarding-times small { font-size: .875rem; }
.exercise h1 { font-size: clamp(1.6rem,3.5vw,2.2rem); }
.answer.wrong { border-color: #df8791; background: #fff0f1; color: #9e2f3b; }
.support-zone { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.support-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.support-action { border: 0; background: #eef1f7; color: var(--ink-2); border-radius: 11px; min-height: 42px; padding: 9px 13px; font-weight: 760; }
.support-action.primary { color: #354ac3; background: #e9edff; }
.support-panel { margin-top: 14px; padding: 18px; border-left: 4px solid var(--blue); border-radius: 4px 13px 13px 4px; background: #f2f4ff; }
.support-panel strong { display: block; margin-bottom: 7px; }
.support-panel p { margin: 0; line-height: 1.55; color: var(--ink-2); }
.support-panel ol { margin: 8px 0 0; padding-left: 20px; line-height: 1.6; }
.feedback { margin-top: 18px; padding: 20px; border-radius: 15px; }
.feedback.good { background: #eaf8f3; border: 1px solid #a7dbc9; }
.feedback.retry { background: #fff3ef; border: 1px solid #ffc5ad; }
.feedback.rescue { background: #fff7d9; border: 1px solid #f1d56f; }
.feedback h3 { margin: 0 0 7px; font-size: 1rem; }
.feedback p { margin: 0; line-height: 1.58; color: var(--ink-2); }
.feedback .answer-reason { margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(17,25,54,.12); }
.feedback .answer-reason p + p { margin-top: 7px; }
.feedback details summary, .support-panel details summary { cursor: pointer; line-height: 1.5; }
.feedback details p, .support-panel details p { margin-top: 8px; }
.feedback .contrast { margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(17,25,54,.12); }
.feedback.good,.feedback.retry { background: transparent; border: 0; padding: 0; margin-top: 30px; }
.feedback > h3 { font-size: 1.13rem; margin-bottom: 20px; }
.answer-verdict { display: flex; flex-direction: column; gap: 7px; background: #eaf7f1; border: 1px solid #8ec6b2; border-left: 5px solid #26735a; border-radius: 13px; padding: 18px 22px; margin: 18px 0; color: #18533f; }
.answer-verdict > span { font-size: .9rem; }
.answer-verdict > strong { font-size: 1.15rem; }
.answer-verdict > small { font-size: .94rem; line-height: 1.5; }
.teaching-card { border: 1px solid #d4dcec; border-radius: 15px; padding: 22px; margin: 20px 0; background: #f7f9fd; }
.teaching-card h3,.teaching-card h4 { font-size: 1.06rem; margin: 0 0 18px; line-height: 1.5; color: #182342; }
.teaching-card h5 { font-size: 1rem; margin: 0 0 8px; line-height: 1.5; color: #182342; }
.teaching-card p,.feedback .teaching-card p,.support-panel .teaching-card p { font-size: 1rem; line-height: 1.8; margin: 0; color: #29354d; max-width: 70ch; }
.term { font-weight: 750; color: #293d86; background: #e9eefb; padding: 0 3px; border-radius: 4px; }
.reasoning-card { background: #f2f6fd; border-color: #c8d6ed; }
.reasoning-steps { list-style: none; counter-reset: explanation; padding: 0 !important; margin: 0 !important; display: grid; gap: 22px; }
.reasoning-steps > li { counter-increment: explanation; display: flex; align-items: flex-start; gap: 13px; }
.reasoning-steps > li::before { content: counter(explanation); display: grid; place-items: center; flex: 0 0 29px; height: 29px; border-radius: 50%; color: #fff; background: #3458a2; font-weight: 800; }
.reasoning-steps > li > div { min-width: 0; }
.feedback .answer-reason { background: #fff7ed; border: 1px solid #e4bd88; border-left: 5px solid #a26317; padding: 22px; margin-top: 20px; }
.comparison-card { background: #f7f3fd; border-color: #d7c7ef; }
.comparison-card > summary { color: #4d3675; font-size: 1rem; padding: 2px 0; }
.example-pair { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; margin-top: 20px; }
.example-tile { background: #fff; border: 1px solid #dfd7ec; border-radius: 12px; padding: 20px; min-width: 0; }
.example-tile h5 { color: #573984; }
.example-tile .example-sentence { font-size: 1.12rem; line-height: 1.7; margin: 14px 0 18px; color: #17213b; font-family: Georgia,serif; }
.example-sentence mark { background: #e8dff8; color: #42266d; padding: 2px 4px; border-bottom: 2px solid #865baf; border-radius: 3px; }
.feedback .reflection { background: #fff; border: 1px dashed #b7c2d6; margin-top: 20px; }
.feedback .reflection h4 { margin-bottom: 8px; }
.support-panel { padding: 0; border: 0; background: transparent; }
.support-panel strong.term { display: inline; margin: 0; }
.hint-card h3 { display: flex; align-items: center; gap: 10px; }
.lesson-route li,.lesson-traps li { margin-bottom: 16px; line-height: 1.75; }
.worked-example > p { padding: 16px 18px; border-left: 3px solid #b6c8e4; background: #f6f8fc; border-radius: 0 10px 10px 0; margin: 18px 0; }
.diagnosis-link { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px; padding: 22px; margin-bottom: 24px; }
.diagnosis-link h2 { margin: 0 0 6px; font-size: 1.15rem; }
.diagnosis-link p,.review-summary p { margin: 0; line-height: 1.6; color: var(--muted); }
.review-summary { padding: 24px; margin-bottom: 22px; }
.review-summary > strong { display: block; margin-bottom: 12px; font-size: 1.2rem; }
.review-list { display: grid; gap: 18px; }
.review-question { padding: 24px; }
.review-question > summary { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.review-question > summary::before { content: '+'; font-size: 1.3rem; color: #3458a2; }
.review-question[open] > summary::before { content: '−'; }
.review-question > summary > span:first-child { flex: 1; }
.review-question h2 { font-size: 1.3rem; margin-top: 25px; }
.review-status { font-size: .88rem; color: #815214; background: #fff2dd; padding: 6px 10px; border-radius: 9px; }
.review-status.is-correct { color: #18533f; background: #eaf7f1; }
.review-selection { line-height: 1.7; }
.update-notice { position: fixed; z-index: 100; bottom: 25px; left: 50%; transform: translateX(-50%); width: min(680px,calc(100% - 32px)); display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 18px; background: #fff; border: 2px solid #3458a2; border-radius: 15px; box-shadow: 0 10px 40px #11193630; }
@media (max-width: 650px) {
  .example-pair { grid-template-columns: 1fr; }
  .teaching-card,.feedback .answer-reason,.example-tile { padding: 17px; }
  .reasoning-steps > li { gap: 10px; }
  .review-question { padding: 19px; }
  .update-notice { bottom: 95px; flex-direction: column; align-items: stretch; }
}
.feedback-footer { margin-top: 16px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.confidence { display: flex; gap: 6px; }
.confidence button { border: 1px solid rgba(17,25,54,.15); background: rgba(255,255,255,.55); border-radius: 9px; padding: 7px 10px; color: var(--ink-2); font-weight: 700; font-size: .8rem; }
.map-head,.method-head { margin-bottom: 25px; }
.map-head h1,.method-head h1,.completion h1 { font-family: Georgia,"Times New Roman",serif; font-size: clamp(2rem,5vw,3.3rem); margin: 0 0 10px; letter-spacing: -.04em; }
.map-head p,.method-head p { color: var(--muted); max-width: 720px; line-height: 1.55; }
.skill-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 15px; }
.skill-card { padding: 20px; box-shadow: none; }
.skill-top { display: flex; justify-content: space-between; gap: 10px; }
.skill-top h2 { font-size: 1rem; margin: 0; }
.skill-top span { font-size: .78rem; color: var(--muted); }
.skill-card p { color: var(--muted); line-height: 1.45; font-size: .85rem; min-height: 2.5em; }
.skill-bar { height: 8px; border-radius: 999px; background: #e5e9f1; overflow: hidden; margin: 16px 0 14px; }
.skill-bar span { display: block; height: 100%; background: var(--blue); border-radius: inherit; }
.skill-card[data-state="secure"] .skill-bar span { background: var(--green); }
.skill-card[data-state="critical"] .skill-bar span { background: var(--orange); }
.skill-card[data-state="neutral"] .skill-bar span { background: #cbd3e2; }
.skill-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.skill-actions .button { padding-inline: 10px; }
.lesson-shell { max-width: 980px; margin: 0 auto; }
.path-key { display:grid; grid-template-columns:1fr 1fr; gap:18px; margin:24px 0; }
.source a { display:inline-block; margin:6px 0 0 6px; color:var(--blue-2); text-underline-offset:3px; }
.path-key p { margin:0; padding:20px; background:#e5ecfa; border-radius:16px; }
.path-key strong,.path-key span { display:block; }
.path-key strong { display:flex; align-items:center; gap:8px; margin-bottom:8px; }
.path-key span { color:var(--ink-2); line-height:1.6; }
.skill-actions { flex-wrap:wrap; }
.text-action { border:0; background:transparent; color:var(--blue-2); padding:10px 0; font-weight:750; text-align:left; text-decoration:underline; text-underline-offset:4px; }
.skill-actions .text-action { width:100%; }
.lesson-steps { display:grid; grid-template-columns:repeat(4,1fr); gap:8px; margin:22px 0; }
.lesson-steps button { display:flex; align-items:center; gap:10px; background:white; color:var(--ink-2); border:1px solid var(--line); border-radius:14px; padding:14px; text-align:left; font-weight:750; }
.lesson-steps button span { display:grid; place-items:center; border-radius:50%; width:26px; height:26px; flex-shrink:0; background:#edf1f7; }
.lesson-steps button[aria-current] { background:var(--ink); color:white; border-color:var(--ink); }
.lesson-steps button[aria-current] span { background:var(--mint); color:var(--ink); }
.lesson-page { padding:clamp(22px,4vw,40px); }
.lesson-page > h2 { font-size:clamp(1.35rem,3vw,1.9rem); margin:0 0 20px; line-height:1.25; }
.lesson-page p { line-height:1.8; }
.lesson-page > p { color:var(--ink-2); max-width:72ch; }
.lesson-intro { font-size:1.08rem; margin-bottom:28px; }
.sentence-parts { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin:24px 0; }
.sentence-parts section { padding:18px; border:1px solid var(--line); border-top:4px solid var(--blue); border-radius:12px; background:#f6f8ff; }
.sentence-parts section:nth-child(2) { border-top-color:var(--green); background:#eff9f5; }
.sentence-parts section:nth-child(3) { border-top-color:#ad5723; background:#fff7ed; }
.sentence-parts strong { font-size:1.08rem; }
.sentence-parts p { margin-bottom:0; font-size:.94rem; }
.lesson-takeaway { padding:22px; margin-top:26px; border-left:4px solid var(--green); background:#edf8f3; border-radius:0 14px 14px 0; }
.lesson-takeaway h3 { margin:0 0 10px; font-size:1rem; }
.lesson-takeaway p { margin:0; }
.lesson-takeaway .button { margin-top:18px; }
.lesson-check-answers { display:grid; gap:12px; margin:22px 0; }
.lesson-check-answers .answer { width:100%; }
.lesson-check-feedback { border:1px solid #dec5a0; background:#fff7eb; padding:22px; border-radius:16px; }
.lesson-check-feedback.is-correct { border-color:#91c8b3; background:#eef9f4; }
.lesson-check-feedback h3 { margin-top:0; }
.lesson-check-feedback p:last-child { margin-bottom:0; }
.lesson-details { line-height:1.75; }
.lesson-details > p,.lesson-details > ul { padding:4px 18px; }
.challenge-setup { padding:24px; margin:26px 0; }
.challenge-setup label { display:block; font-weight:800; margin-bottom:12px; }
.challenge-setup select { width:100%; max-width:620px; background:white; color:var(--ink); padding:14px; border:1px solid var(--line); border-radius:12px; }
.challenge-setup p { color:var(--muted); line-height:1.65; max-width:76ch; margin-bottom:0; }
.challenge-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; margin:24px 0; }
.challenge-card { padding:26px; border-top:5px solid var(--blue); display:flex; flex-direction:column; }
.challenge-card:nth-child(2) { border-top-color:#aa5a29; }
.challenge-card:nth-child(3) { border-top-color:#8452ae; }
.challenge-card h2 { margin:0 0 12px; }
.challenge-card > p:not(.eyebrow) { line-height:1.65; color:var(--ink-2); }
.challenge-card .button { margin-top:auto; width:100%; }
.challenge-count { padding-top:18px; border-top:1px solid var(--line); }
.challenge-count strong,.challenge-count span { display:block; }
.challenge-count span { font-size:.85rem; margin-top:6px; }
.challenge-footnote { padding:24px 0; max-width:80ch; line-height:1.75; }
.side-card h2 { display:flex; align-items:center; gap:8px; font-size:1.12rem; margin:0 0 12px; }
.learning-entry { border-top:5px solid var(--green); }
@media(max-width:1100px) { .topbar { grid-template-columns:1fr auto; padding-top:14px; padding-bottom:12px; } .nav { grid-row:2; grid-column:1/-1; justify-self:center; } .topbar-actions { grid-column:2; grid-row:1; } }
@media(max-width:700px) { .path-key,.sentence-parts,.challenge-grid { grid-template-columns:1fr; } .lesson-steps { grid-template-columns:1fr 1fr; } .nav { width:100%; overflow-x:auto; } .nav button { flex:1; white-space:nowrap; padding:10px; font-size:.8rem; } .challenge-card { padding:22px; } }
.back-link { border: 0; background: transparent; color: var(--blue-2); font-weight: 800; padding: 5px 0; margin-bottom: 19px; }
.lesson-head { display: grid; grid-template-columns: minmax(0,1.5fr) minmax(230px,.65fr); align-items: end; gap: 28px; margin-bottom: 22px; }
.lesson-head h1 { margin: 0; font-family: Georgia,"Times New Roman",serif; font-size: clamp(2.2rem,5vw,3.7rem); letter-spacing: -.045em; }
.lesson-head > div > p:last-child { color: var(--muted); line-height: 1.65; font-size: 1rem; max-width: 680px; }
.lesson-head aside { background: var(--ink); color: #fff; border-radius: 18px; padding: 20px; box-shadow: var(--shadow); }
.lesson-head aside span { display: block; color: var(--mint); font-weight: 800; font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; margin-bottom: 8px; }
.lesson-head aside strong { display: block; font-family: Georgia,"Times New Roman",serif; font-size: 1.25rem; line-height: 1.35; }
.lesson-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.lesson-card { padding: clamp(22px,4vw,32px); box-shadow: none; }
.lesson-route,.lesson-traps { margin: 0; padding: 0; list-style: none; display: grid; gap: 13px; }
.lesson-route { counter-reset: lesson-step; }
.lesson-route li { counter-increment: lesson-step; display: grid; grid-template-columns: 32px 1fr; align-items: start; gap: 11px; line-height: 1.5; }
.lesson-route li::before { content: counter(lesson-step); width: 29px; height: 29px; border-radius: 9px; display: grid; place-items: center; background: var(--ink); color: var(--mint); font-weight: 850; font-size: .78rem; }
.lesson-traps li { position: relative; padding-left: 20px; line-height: 1.55; color: var(--ink-2); }
.lesson-traps li::before { content: "!"; position: absolute; left: 0; top: 1px; color: var(--orange); font-weight: 900; }
.contrast-box { margin-top: 18px; border-left: 5px solid var(--orange); border-radius: 4px 16px 16px 4px; background: #fff4ef; padding: 20px 24px; }
.contrast-box p:not(.eyebrow) { margin: 6px 0 0; line-height: 1.55; }
.lesson-footer { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-top: 22px; padding: 20px 0; }
.lesson-footer p { margin: 0; color: var(--muted); line-height: 1.5; }
.sheet-pattern { margin-top: 18px; padding: 15px; background: #f2f4ff; border-radius: 12px; }
.sheet-pattern strong { display: block; color: var(--blue-2); }
.sheet-pattern p { margin: 5px 0 0; color: var(--muted); line-height: 1.5; font-size: .88rem; }
.method-layout { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(280px,.8fr); gap: 22px; }
.method-card { padding: clamp(22px,4vw,34px); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 15px; counter-reset: step; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 42px 1fr; gap: 14px; align-items: start; }
.steps li::before { content: counter(step); width: 38px; height: 38px; display: grid; place-items: center; background: var(--ink); color: var(--mint); border-radius: 12px; font-weight: 850; }
.steps strong { display: block; margin: 2px 0 5px; }
.steps span { color: var(--muted); line-height: 1.5; font-size: .9rem; }
.contrast-table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.contrast-table th,.contrast-table td { text-align: left; vertical-align: top; padding: 13px 10px; border-bottom: 1px solid var(--line); line-height: 1.42; }
.contrast-table th { color: var(--muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .06em; }
.completion { max-width: 760px; margin: 20px auto; padding: clamp(26px,5vw,48px); text-align: center; }
.completion-badge { width: 68px; height: 68px; border-radius: 22px; margin: 0 auto 20px; display: grid; place-items: center; background: var(--ink); color: var(--mint); font-size: 1.8rem; }
.result-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin: 26px 0; }
.result-grid div { background: #f4f6fa; border-radius: 14px; padding: 17px 10px; }
.result-grid strong { display: block; font-size: 1.4rem; }
.result-grid span { color: var(--muted); font-size: .78rem; }
.completion-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 12px 17px; border-radius: 12px; box-shadow: var(--shadow); z-index: 20; font-weight: 700; font-size: .88rem; }
.auth-dialog { width: min(92vw,480px); border: 0; border-radius: 22px; padding: 0; color: var(--ink); box-shadow: 0 28px 80px rgba(10,17,40,.35); }
.auth-dialog::backdrop { background: rgba(9,15,34,.66); backdrop-filter: blur(4px); }
.auth-card { position: relative; padding: 34px; }
.auth-card h2 { margin: 0 0 10px; font-family: Georgia,"Times New Roman",serif; font-size: 2rem; letter-spacing: -.035em; }
.auth-card > p:not(.eyebrow):not(.auth-error) { color: var(--muted); line-height: 1.5; margin: 0 0 22px; }
.auth-card label { display: grid; gap: 7px; margin-top: 14px; font-weight: 760; font-size: .86rem; }
.auth-card input { width: 100%; border: 1px solid var(--line); border-radius: 11px; min-height: 46px; padding: 10px 12px; color: var(--ink); background: #fff; }
.auth-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 20px; }
.dialog-close { position: absolute; top: 16px; right: 17px; border: 0; background: #eef1f7; color: var(--muted); width: 34px; height: 34px; border-radius: 50%; font-size: 1.35rem; line-height: 1; }
.auth-error { margin: 12px 0 0; padding: 10px 12px; border-radius: 10px; background: #fff0f1; color: #9e2f3b; font-size: .84rem; }
.sign-out { display: block; width: 100%; margin-top: 18px; min-height: 44px; border: 1px solid var(--line); border-radius: 11px; background: #fff; color: var(--ink-2); font-weight: 760; }
.auth-card [hidden] { display: none !important; }
.auth-note { margin: 14px 0 0 !important; text-align: center; font-size: .8rem; }
.auth-actions { grid-template-columns: 1fr; }
body.auth-pending .topbar, body.auth-pending .app-shell,
body.auth-locked .topbar, body.auth-locked .app-shell { visibility: hidden; }
@media (max-width: 880px) {
  .topbar { grid-template-columns: 1fr auto; }
  .nav { position: fixed; left: 50%; bottom: 14px; transform: translateX(-50%); z-index: 20; box-shadow: 0 12px 30px rgba(17,25,54,.22); background: var(--ink); }
  .nav button.is-active { background: var(--mint); }
  .dashboard-grid,.method-layout { grid-template-columns: 1fr; }
  .lesson-head,.lesson-grid { grid-template-columns: 1fr; }
  .skill-grid { grid-template-columns: repeat(2,1fr); }
  .app-shell { padding-bottom: 110px; }
}
@media (max-width: 580px) {
  .topbar { min-height: 66px; padding: 0 16px; }
  .app-shell { padding: 28px 14px 105px; }
  .dashboard-grid,.skill-grid { grid-template-columns: 1fr; }
  .answers { grid-template-columns: 1fr; }
  .exercise-head { display: block; }
  .level { display: inline-flex; margin-top: 11px; }
  .session-controls { align-items: stretch; }
  .session-controls > * { width: 100%; }
  .time-control { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .result-grid { grid-template-columns: 1fr; }
  .lesson-footer { align-items: stretch; flex-direction: column; }
  .lesson-footer .button { width: 100%; }
  .brand > span:last-child { display: none; }
  .topbar-actions { gap: 8px; }
  .countdown span { display: none; }
  .auth-card { padding: 29px 22px 24px; }
  .auth-actions { grid-template-columns: 1fr; }
  .onboarding-card { min-height: 0; padding: 28px 22px; }
  .onboarding-number { width: 44px; height: 44px; border-radius: 14px; font-size: 1.35rem; }
  .onboarding-card h1 { padding-right: 45px; }
  .onboarding-topics { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .onboarding-choices { grid-template-columns: 1fr; }
  .onboarding-times { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .onboarding-actions .button { padding-inline: 14px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }