:root {
  --ink: #1e2a26;
  --muted: #6f7771;
  --paper: #f6f2e9;
  --card: rgba(255, 255, 252, .82);
  --green: #196b52;
  --green-dark: #0f4b3a;
  --lime: #d9e6a7;
  --orange: #e8844d;
  --blue: #507b93;
  --line: rgba(30, 42, 38, .12);
  --shadow: 0 18px 50px rgba(41, 50, 43, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; overflow-x: hidden; }
button, select, input { font: inherit; }
button { color: inherit; }
.ambient { position: fixed; border-radius: 50%; filter: blur(8px); pointer-events: none; z-index: -1; }
.ambient-one { width: 430px; height: 430px; right: -120px; top: 70px; background: rgba(217,230,167,.48); }
.ambient-two { width: 340px; height: 340px; left: -160px; top: 500px; background: rgba(80,123,147,.12); }

.topbar { height: 76px; max-width: 1180px; margin: 0 auto; padding: 0 28px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; width: max-content; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; background: var(--green); color: white; border-radius: 12px 5px 12px 5px; font-family: SimSun, serif; font-size: 20px; }
.brand strong, .brand small { display: block; }
.brand strong { font-family: SimSun, serif; letter-spacing: .12em; font-size: 17px; }
.brand small { margin-top: 2px; color: var(--muted); font-size: 10px; letter-spacing: .18em; }
.nav { display: flex; gap: 5px; padding: 5px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.46); }
.nav-link { border: 0; background: transparent; padding: 9px 18px; color: var(--muted); border-radius: 999px; cursor: pointer; font-size: 14px; }
.nav-link.active { color: white; background: var(--green); }
.streak-pill { justify-self: end; border: 1px solid var(--line); background: rgba(255,255,255,.6); padding: 10px 15px; border-radius: 999px; cursor: pointer; }
.streak-dot { display: inline-block; width: 8px; height: 8px; margin-right: 7px; border-radius: 50%; background: var(--orange); box-shadow: 0 0 0 4px rgba(232,132,77,.14); }
.streak-pill.done { background: var(--green); color: white; border-color: var(--green); }
.streak-pill.done .streak-dot { background: var(--lime); }

main { max-width: 1180px; min-height: calc(100vh - 140px); margin: 0 auto; padding: 40px 28px 80px; }
.view { display: none; animation: enter .3s ease; }
.view.active { display: block; }
@keyframes enter { from { opacity: 0; transform: translateY(8px); } }
.hero { min-height: 450px; display: grid; grid-template-columns: 1.35fr .65fr; align-items: center; gap: 70px; padding: 35px 0 55px; }
.eyebrow { margin: 0 0 14px; color: var(--green); font-size: 11px; font-weight: 700; letter-spacing: .21em; text-transform: uppercase; }
.hero h1, .page-heading h1 { font-family: SimSun, STSong, serif; font-weight: 500; letter-spacing: -.03em; margin: 0; }
.hero h1 { font-size: clamp(48px, 7vw, 82px); line-height: 1.08; }
.hero h1 em { color: var(--green); font-style: normal; position: relative; }
.hero h1 em::after { content: ""; position: absolute; height: 8px; left: 2px; right: 0; bottom: 2px; background: var(--lime); z-index: -1; border-radius: 50%; }
.hero-sub { max-width: 600px; margin: 25px 0 30px; color: var(--muted); font-size: 16px; line-height: 1.9; }
.hero-actions { display: flex; gap: 12px; }
.primary-button, .ghost-button { border-radius: 12px; padding: 13px 19px; cursor: pointer; border: 1px solid var(--green); font-weight: 700; }
.primary-button { color: white; background: var(--green); box-shadow: 0 8px 20px rgba(25,107,82,.18); }
.primary-button:hover { background: var(--green-dark); transform: translateY(-1px); }
.primary-button span { margin-left: 12px; }
.ghost-button { background: transparent; color: var(--green); }
.today-card { background: var(--card); border: 1px solid rgba(255,255,255,.8); box-shadow: var(--shadow); border-radius: 26px; padding: 25px; backdrop-filter: blur(14px); }
.today-head { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); }
.today-head strong { color: var(--green); }
.progress-ring { --progress: 0deg; width: 162px; height: 162px; margin: 24px auto 20px; padding: 12px; border-radius: 50%; background: conic-gradient(var(--green) var(--progress), #e6e5dc 0); }
.progress-ring > div { width: 100%; height: 100%; display: grid; place-content: center; text-align: center; border-radius: 50%; background: #fcfbf6; }
.progress-ring strong { font-family: Georgia, serif; font-size: 45px; line-height: 1; }
.progress-ring span { color: var(--muted); font-size: 12px; }
.today-card > p { text-align: center; color: var(--muted); font-size: 13px; }
.mini-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 22px; border-radius: 13px; overflow: hidden; background: var(--line); }
.mini-stats div { padding: 13px; text-align: center; background: #f7f5ee; }
.mini-stats span, .mini-stats strong { display: block; }
.mini-stats span { color: var(--muted); font-size: 10px; margin-bottom: 4px; }

.section-block { margin-top: 35px; }
.mode-section { margin: 6px 0 42px; }.mode-current { color: var(--muted); font-size: 12px; }.mode-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }.mode-card { display: grid; grid-template-columns: auto 1fr; column-gap: 11px; align-items: center; padding: 17px; text-align: left; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.5); cursor: pointer; }.mode-card > span { grid-row: 1 / 3; display: grid; place-items: center; width: 35px; height: 35px; border-radius: 9px; color: var(--green); background: rgba(25,107,82,.09); font: 16px Georgia,serif; }.mode-card strong { font-size: 13px; }.mode-card small { color: var(--muted); line-height: 1.5; }.mode-card.active { border-color: var(--green); background: rgba(217,230,167,.25); box-shadow: 0 7px 20px rgba(25,107,82,.08); }.mode-card.active > span { color: white; background: var(--green); }.mode-note { margin: 11px 0 0; color: var(--muted); font-size: 11px; }
.section-title { display: flex; justify-content: space-between; align-items: end; margin-bottom: 22px; }
.section-title h2 { margin: 0; font-family: SimSun, serif; font-size: 32px; font-weight: 500; }
.daily-limit { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; }
.daily-limit select { border: 1px solid var(--line); border-radius: 10px; padding: 9px 30px 9px 11px; color: var(--ink); background: rgba(255,255,255,.62); }
.subject-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.subject-card { position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 19px; background: rgba(255,255,255,.58); padding: 22px; transition: .2s ease; }
.subject-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); background: rgba(255,255,255,.88); }
.subject-index { position: absolute; right: 14px; top: 5px; font: 52px Georgia, serif; color: rgba(30,42,38,.06); }
.subject-icon { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 12px; color: white; font-family: Georgia, serif; font-size: 18px; }
.level-chip { position: absolute; top: 22px; left: 76px; padding: 5px 9px; border-radius: 99px; color: var(--green); background: rgba(25,107,82,.08); font-size: 10px; font-weight: 700; }
.math .subject-icon { background: var(--green); }.physics .subject-icon { background: var(--blue); }.cpp .subject-icon { background: var(--orange); }
.subject-card h3 { margin: 19px 0 5px; font-family: SimSun, serif; font-size: 21px; }
.subject-card > p { height: 42px; margin: 0 0 20px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.card-progress { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); }
.card-progress-bar { height: 5px; background: #e2e1d7; border-radius: 99px; margin: 8px 0 17px; overflow: hidden; }
.card-progress-bar i { display: block; height: 100%; background: var(--green); border-radius: inherit; }
.subject-start { width: 100%; padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: transparent; cursor: pointer; }
.subject-start:hover { border-color: var(--green); color: var(--green); }
.clarity-card { display: grid; grid-template-columns: auto 1fr auto; gap: 20px; align-items: center; margin-top: 24px; padding: 22px; background: rgba(217,230,167,.3); border: 1px solid rgba(25,107,82,.12); border-radius: 18px; }
.clarity-icon { display: grid; place-items: center; width: 46px; height: 46px; color: var(--green); background: rgba(255,255,255,.65); border-radius: 50%; font-family: SimSun, serif; font-size: 20px; }
.clarity-card h3 { margin: 0 0 6px; font-size: 15px; }.clarity-card p:last-child { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.status-badge, .level-tag { padding: 6px 10px; border-radius: 99px; background: rgba(25,107,82,.1); color: var(--green); font-size: 11px; white-space: nowrap; }

.page-heading { padding: 45px 0 30px; }.page-heading h1 { font-size: 50px; }.page-heading > p:last-child { color: var(--muted); }
.progress-dashboard { display: grid; gap: 9px; margin-bottom: 24px; }.progress-dashboard article { display: grid; grid-template-columns: auto 1.1fr repeat(3,1fr); gap: 14px; align-items: center; padding: 13px 16px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255,255,255,.57); }.progress-dashboard .subject-icon { width: 36px; height: 36px; }.progress-dashboard .subject-icon.math { background:var(--green); }.progress-dashboard .subject-icon.physics { background:var(--blue); }.progress-dashboard .subject-icon.cpp { background:var(--orange); }.progress-dashboard div:not(.subject-icon) { min-width:0; }.progress-dashboard span,.progress-dashboard strong { display:block; }.progress-dashboard span { margin-bottom:4px; color:var(--muted); font-size:9px; }.progress-dashboard strong { overflow-wrap:anywhere; font-size:11px; }
.route-tabs { display: flex; gap: 10px; margin-bottom: 25px; }
.route-tab { padding: 10px 18px; border: 1px solid var(--line); background: rgba(255,255,255,.5); border-radius: 10px; cursor: pointer; }
.route-tab.active { background: var(--green); color: white; }
.route-list { position: relative; max-width: 800px; }
.route-list::before { content: ""; position: absolute; left: 24px; top: 24px; bottom: 24px; width: 1px; background: rgba(25,107,82,.25); }
.route-step { position: relative; display: grid; grid-template-columns: 49px 1fr auto; align-items: center; gap: 18px; margin-bottom: 14px; padding: 20px; border: 1px solid var(--line); background: rgba(255,255,255,.62); border-radius: 16px; }
.step-number { z-index: 1; display: grid; place-items: center; width: 49px; height: 49px; border: 6px solid var(--paper); background: var(--green); color: white; border-radius: 50%; font: 16px Georgia, serif; }
.route-step.locked .step-number { background: #a9ada6; }.route-step h3 { margin: 0 0 5px; font-size: 16px; }.route-step p { margin: 0; color: var(--muted); font-size: 12px; }
.step-state { color: var(--green); font-size: 12px; }
.mistake-toolbar { display: flex; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.mistake-insights { display:grid; grid-template-columns:repeat(3,1fr); gap:9px; padding:14px; border:1px solid rgba(25,107,82,.12); border-radius:14px; background:rgba(217,230,167,.22); }.mistake-insights div { padding:8px; }.mistake-insights span,.mistake-insights strong { display:block; }.mistake-insights span { margin-bottom:5px; color:var(--green); font-size:9px; }.mistake-insights strong { font-size:11px; line-height:1.6; }
.text-button { border: 0; color: var(--green); background: none; cursor: pointer; }
.mistake-list { display: grid; gap: 12px; margin-top: 20px; }
.mistake-item { padding: 20px; background: rgba(255,255,255,.65); border: 1px solid var(--line); border-radius: 15px; }
.mistake-item header { display: flex; justify-content: space-between; gap: 12px; }.mistake-item h3 { margin: 10px 0 6px; font-size: 16px; }.mistake-item p { color: var(--muted); font-size: 13px; }.master-button { padding: 7px 11px; border: 1px solid var(--green); color: var(--green); background: transparent; border-radius: 8px; cursor: pointer; }
.empty-state { text-align: center; padding: 70px 20px; color: var(--muted); }.empty-state strong { display: block; margin-bottom: 8px; color: var(--ink); font: 27px SimSun, serif; }

.material-limit { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 18px; padding: 15px 18px; border: 1px solid rgba(232,132,77,.2); border-radius: 12px; background: rgba(255,243,217,.55); font-size: 12px; line-height: 1.7; }.material-limit strong { flex: 0 0 auto; color: #9a582f; }.material-limit span { color: var(--muted); }
.upload-zone { display: grid; place-items: center; min-height: 180px; padding: 28px; border: 1.5px dashed rgba(25,107,82,.35); border-radius: 18px; background: rgba(255,255,255,.48); cursor: pointer; text-align: center; }.upload-zone:hover { border-color: var(--green); background: rgba(255,255,255,.75); }.upload-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; }.upload-symbol { display: grid; place-items: center; width: 45px; height: 45px; margin-bottom: 10px; border-radius: 50%; color: white; background: var(--green); font-size: 24px; }.upload-zone strong { font-size: 17px; }.upload-zone small { margin-top: 8px; color: var(--muted); }
.material-toolbar { display: flex; justify-content: space-between; margin: 24px 0 12px; color: var(--muted); font-size: 12px; }.material-list { display: grid; gap: 14px; }.material-card { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.67); }.material-file { display: grid; grid-template-columns: auto 1fr auto; gap: 13px; align-items: center; }.file-kind { display: grid; place-items: center; width: 49px; height: 49px; border-radius: 11px; color: white; background: var(--blue); font-size: 10px; font-weight: 700; }.material-file h3 { margin: 0 0 5px; font-size: 15px; overflow-wrap: anywhere; }.material-file p { margin: 0; color: var(--muted); font-size: 11px; }.recognition-status { padding: 5px 9px; border-radius: 99px; color: var(--green); background: rgba(25,107,82,.09); font-size: 10px; }.recognition-status.low { color: #9a582f; background: rgba(232,132,77,.1); }
.material-recognition { display: grid; grid-template-columns: repeat(5,1fr); gap: 8px; margin-top: 17px; }.material-recognition div { padding: 10px; border-radius: 9px; background: #f3f1e9; }.material-recognition span,.material-recognition strong { display: block; }.material-recognition span { margin-bottom: 4px; color: var(--muted); font-size: 9px; }.material-recognition strong { font-size: 11px; font-weight: 600; overflow-wrap: anywhere; }.parse-note { margin: 13px 0; color: var(--muted); font-size: 11px; line-height: 1.6; }.material-actions { display: flex; gap: 8px; }.material-actions button { padding: 8px 11px; border: 1px solid var(--line); border-radius: 8px; background: white; cursor: pointer; font-size: 11px; }.material-actions button:hover { border-color: var(--green); color: var(--green); }.material-actions .danger-button { margin-left: auto; color: #a34236; }.material-actions .save-material { color: white; background: var(--green); border-color: var(--green); }
.material-edit { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }.material-edit[hidden] { display:none; }.material-edit label { display: grid; gap: 5px; color: var(--muted); font-size: 10px; }.material-edit input,.material-edit select,.material-edit textarea { width: 100%; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: white; color: var(--ink); }.material-edit textarea { min-height: 100px; resize: vertical; }.wide-field { grid-column: 1 / -1; }
.material-actions button:disabled { opacity: .45; cursor: not-allowed; }.generated-section { margin-top: 50px; }.generated-card { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin-bottom: 10px; padding: 17px; border: 1px solid var(--line); border-radius: 13px; background: rgba(255,255,255,.6); }.generated-card h3 { margin: 10px 0 5px; font-size: 14px; }.generated-card p { margin: 0; color: var(--muted); font-size: 11px; }.generated-card button { flex: 0 0 auto; padding: 9px 12px; border: 1px solid var(--green); border-radius: 8px; color: var(--green); background: white; cursor: pointer; }.empty-state.compact { padding: 35px 20px; }.empty-state.compact strong { font-size: 20px; }

.modal-backdrop { position: fixed; inset: 0; z-index: 10; display: grid; place-items: center; padding: 20px; background: rgba(20,30,26,.48); backdrop-filter: blur(7px); }
.modal-backdrop[hidden] { display: none; }
.quiz-modal { width: min(720px, 100%); max-height: calc(100vh - 40px); overflow: auto; background: #fcfaf4; border-radius: 23px; box-shadow: 0 30px 90px rgba(0,0,0,.24); }
.quiz-topbar { display: grid; grid-template-columns: 35px 1fr auto; gap: 14px; align-items: center; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.icon-button { border: 0; width: 34px; height: 34px; border-radius: 50%; background: #eeece4; cursor: pointer; font-size: 23px; }
.quiz-progress { text-align: center; font-size: 12px; }.quiz-progress > div { height: 3px; margin-top: 7px; background: #dddcd4; border-radius: 9px; }.quiz-progress i { display: block; width: 0; height: 100%; background: var(--green); transition: width .25s; }
#quizCounter { color: var(--muted); font-size: 12px; }.quiz-body { padding: 38px 48px 45px; }
.question-meta { display: flex; align-items: center; gap: 10px; }.question-meta > div { display: flex; gap: 6px; }.question-meta > div span { color: var(--muted); font-size: 11px; }
.quiz-body h2 { margin: 20px 0 10px; font-family: SimSun, serif; font-size: 25px; font-weight: 500; line-height: 1.55; }.question-context { color: var(--muted); line-height: 1.7; }
.question-facts { display: grid; grid-template-columns: 1fr 1fr 1.4fr; gap: 8px; margin: 18px 0; }
.question-facts > div { padding: 10px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.5); }
.question-facts span, .question-facts strong, .question-facts small { display: block; }
.question-facts > div:nth-child(4) { grid-column: 1 / -1; }
.question-facts span { margin-bottom: 5px; color: var(--muted); font-size: 10px; }.question-facts strong { font-size: 12px; }.question-facts small { margin-top: 4px; color: var(--muted); line-height: 1.4; }
.hint-box { margin: 18px 0 4px; }.hint-button { border: 0; padding: 0; color: var(--green); background: none; cursor: pointer; font-size: 12px; font-weight: 700; }.hint-button:disabled { color: var(--muted); cursor: default; }
.hint-box p { margin: 10px 0; padding: 13px 15px; border-left: 3px solid var(--lime); background: rgba(217,230,167,.18); color: var(--ink); font-size: 13px; line-height: 1.7; }.hint-box p span { display: block; }
.option-list { display: grid; gap: 10px; margin: 25px 0; }.option { display: flex; gap: 12px; align-items: center; padding: 14px; border: 1px solid var(--line); border-radius: 11px; cursor: pointer; }.option:hover { border-color: var(--green); }.option:has(input:checked) { border-color: var(--green); background: rgba(25,107,82,.06); }.option input { accent-color: var(--green); }
.number-answer { width: 100%; margin: 25px 0; padding: 15px; border: 1px solid var(--line); border-radius: 11px; background: white; outline: 0; }.number-answer:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(25,107,82,.1); }
.work-answer { width: 100%; min-height: 180px; resize: vertical; margin: 20px 0; padding: 15px; border: 1px solid var(--line); border-radius: 11px; background: white; line-height: 1.7; outline: 0; }.work-answer:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(25,107,82,.1); }.code-answer { min-height: 230px; color: #20352e; background: #f5f7f4; font: 13px/1.65 Consolas, monospace; tab-size: 4; }
.code-notice { margin-top: 18px; padding: 11px 13px; border-radius: 9px; color: #755123; background: #fff3d9; font-size: 11px; line-height: 1.6; }
.submit-answer { width: 100%; }.feedback { border-top: 1px solid var(--line); margin-top: 25px; padding-top: 22px; }.feedback-result { font-size: 20px; font-weight: 700; }.feedback-result.correct { color: var(--green); }.feedback-result.wrong { color: #b04b36; }.analysis-block { margin-top: 17px; padding: 16px; border-radius: 11px; background: #f0eee6; }.analysis-block span { color: var(--green); font-size: 11px; font-weight: 700; letter-spacing: .12em; }.analysis-block p { margin: 8px 0 0; line-height: 1.8; font-size: 14px; }.analysis-block.keypoint { background: rgba(217,230,167,.27); }.feedback .primary-button { margin-top: 18px; width: 100%; }
.error-diagnosis { margin-top: 14px; padding: 14px; border-left: 3px solid var(--orange); border-radius: 8px; background: rgba(232,132,77,.08); font-size: 13px; line-height: 1.7; }.error-diagnosis p, .error-diagnosis ol { margin: 7px 0 0; padding-left: 20px; }
.reveal-solution { width:100%; margin-top:14px; padding:11px; border:1px solid var(--green); border-radius:9px; color:var(--green); background:white; cursor:pointer; }
.self-rating { margin-top: 16px; padding: 15px; border: 1px solid var(--line); border-radius: 11px; }.self-rating p { margin: 0 0 10px; font-size: 13px; }.self-rating button { margin-right: 8px; padding: 8px 12px; border: 1px solid var(--green); border-radius: 8px; color: var(--green); background: white; cursor: pointer; }
.toast { position: fixed; left: 50%; bottom: 25px; z-index: 20; transform: translate(-50%, 30px); opacity: 0; padding: 11px 17px; color: white; background: var(--ink); border-radius: 10px; box-shadow: var(--shadow); transition: .25s; pointer-events: none; }.toast.show { opacity: 1; transform: translate(-50%, 0); }
footer { max-width: 1180px; margin: 0 auto; padding: 24px 28px; display: flex; justify-content: space-between; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }

.account-tools { display:flex; align-items:center; gap:9px; justify-content:flex-end; min-width:0; }.account-button { display:flex; align-items:center; gap:7px; padding:7px 10px; border:1px solid var(--line); border-radius:99px; background:rgba(255,255,255,.72); color:var(--ink); cursor:pointer; }.account-avatar { display:grid; place-items:center; width:24px; height:24px; border-radius:50%; background:var(--green); color:white; font-size:10px; }.sync-state { padding:5px 8px; border-radius:99px; color:var(--green); background:rgba(25,107,82,.08); font-size:10px; white-space:nowrap; }.sync-state.pending,.sync-state.syncing { color:#8d5b21; background:rgba(232,132,77,.1); }.sync-state.failed,.sync-state.offline { color:#a34236; background:rgba(163,66,54,.09); }.sync-state.local { color:var(--muted); background:rgba(64,69,65,.06); }
.migration-banner { position:relative; display:flex; gap:18px; align-items:center; margin:18px 0 8px; padding:16px 48px 16px 18px; border:1px solid rgba(232,132,77,.25); border-radius:14px; background:#fff8e9; }.migration-banner[hidden] { display:none; }.migration-banner div { flex:1; }.migration-banner strong { font-size:14px; }.migration-banner p { margin:5px 0 0; color:var(--muted); font-size:11px; line-height:1.6; }.migration-banner>button:not(.migration-dismiss) { padding:9px 13px; border:0; border-radius:8px; background:var(--green); color:white; cursor:pointer; }.migration-dismiss { position:absolute; top:8px; right:10px; border:0; background:transparent; color:var(--muted); font-size:18px; cursor:pointer; }
.free-practice { margin:70px 0 20px; padding:27px; border:1px solid rgba(25,107,82,.18); border-radius:20px; background:rgba(255,255,255,.58); }.free-practice[hidden] { display:none; }.today-learning-stats { display:grid; grid-template-columns:repeat(5,1fr); gap:8px; margin:20px 0; }.today-learning-stats div { padding:12px; border-radius:10px; background:#f0eee6; }.today-learning-stats span,.today-learning-stats strong { display:block; }.today-learning-stats span { color:var(--muted); font-size:9px; }.today-learning-stats strong { margin-top:5px; font-size:14px; }.free-practice-controls { display:flex; flex-wrap:wrap; gap:8px; align-items:end; }.free-practice-controls label { display:grid; gap:5px; margin-right:4px; color:var(--muted); font-size:10px; }.free-practice-controls select,.free-practice-controls button { padding:9px 11px; border:1px solid var(--line); border-radius:8px; background:white; color:var(--ink); cursor:pointer; }.free-practice-controls button:hover { border-color:var(--green); color:var(--green); }
.answer-actions { display:grid; grid-template-columns:1fr auto; gap:10px; }.dont-know-button { padding:0 20px; border:1px solid #b97955; border-radius:9px; color:#9a582f; background:#fff8e9; cursor:pointer; }.remedial-recommendation { margin-top:14px; padding:14px; border:1px solid rgba(25,107,82,.18); border-radius:10px; background:#f6faed; font-size:12px; line-height:1.6; }.remedial-recommendation button { display:block; margin-top:8px; padding:7px 10px; border:1px solid var(--green); border-radius:7px; color:var(--green); background:white; cursor:pointer; }
.auth-backdrop { z-index:80; }.auth-modal { position:relative; width:min(92vw,520px); max-height:88vh; overflow:auto; padding:34px; border-radius:20px; background:#fbfaf6; box-shadow:0 24px 80px rgba(22,35,29,.25); }.auth-modal h2 { margin:6px 0 8px; font-size:28px; }.auth-close { position:absolute; top:14px; right:14px; }.auth-note { color:var(--muted); font-size:12px; line-height:1.7; }.auth-form { display:grid; gap:13px; margin-top:22px; }.auth-form label { display:grid; gap:6px; color:var(--muted); font-size:11px; }.auth-form input { width:100%; padding:11px 12px; border:1px solid var(--line); border-radius:9px; background:white; color:var(--ink); }.auth-form.compact { grid-template-columns:1fr 1fr; }.auth-form.compact button,.auth-form.compact .form-error { grid-column:1/-1; }.auth-form button:not(.primary-button),.logout-button { padding:10px 13px; border:1px solid var(--green); border-radius:8px; background:white; color:var(--green); cursor:pointer; }.form-error { margin:0; color:#a34236; font-size:11px; }.bootstrap-details { margin-top:22px; padding-top:16px; border-top:1px solid var(--line); color:var(--muted); font-size:11px; }.bootstrap-details summary { cursor:pointer; }.account-admin { margin-top:24px; padding-top:18px; border-top:1px solid var(--line); }.account-admin-head { display:flex; justify-content:space-between; }.account-user { display:flex; justify-content:space-between; margin-top:9px; padding:9px 11px; border-radius:8px; background:#f1efe7; font-size:11px; }.logout-button { width:100%; margin-top:24px; color:#a34236; border-color:rgba(163,66,54,.3); }.auth-required main,.auth-required footer { filter:blur(3px); pointer-events:none; user-select:none; }

@media (max-width: 760px) {
  .topbar { height: auto; min-height: 70px; padding: 12px 18px; grid-template-columns: 1fr auto; }.brand small { display: none; }.nav { position: fixed; z-index: 8; bottom: 12px; left: 50%; transform: translateX(-50%); width: calc(100% - 28px); justify-content: space-around; background: rgba(252,250,244,.94); box-shadow: var(--shadow); backdrop-filter: blur(12px); }.nav-link { flex: 1; padding-inline: 8px; }.streak-pill { font-size: 12px; }
  main { padding: 20px 18px 100px; }.hero { min-height: 0; grid-template-columns: 1fr; gap: 35px; padding-top: 45px; }.hero h1 { font-size: 53px; }.hero-sub { font-size: 14px; }.today-card { max-width: 430px; width: 100%; margin: auto; }.subject-grid { grid-template-columns: 1fr; }.subject-card > p { height: auto; }.clarity-card { grid-template-columns: auto 1fr; }.clarity-card .status-badge { grid-column: 2; width: max-content; }.section-title { align-items: start; gap: 20px; }.daily-limit { display: grid; gap: 4px; }
  .mode-grid { grid-template-columns: 1fr; }.mode-section { margin-top: 38px; }
  .page-heading { padding-top: 40px; }.page-heading h1 { font-size: 40px; }.route-tabs { overflow-x: auto; }.route-tab { white-space: nowrap; }.route-step { grid-template-columns: 42px 1fr; padding: 15px; }.step-number { width: 42px; height: 42px; }.step-state { grid-column: 2; }.route-list::before { left: 21px; }
  .progress-dashboard article { grid-template-columns: auto 1fr 1fr; }.progress-dashboard article > div:nth-child(4),.progress-dashboard article > div:nth-child(5) { grid-column:2 / -1; }.mistake-insights { grid-template-columns:1fr; }
  .quiz-body { padding: 26px 20px 32px; }.quiz-modal { max-height: calc(100vh - 20px); }.modal-backdrop { padding: 10px; }
  .question-facts { grid-template-columns: 1fr 1fr; }.question-facts > div:last-child { grid-column: 1 / -1; }
  .nav-link { font-size: 11px; }.material-limit { display: block; }.material-limit strong { display: block; margin-bottom: 5px; }.material-recognition { grid-template-columns: 1fr 1fr; }.material-file { grid-template-columns: auto 1fr; }.recognition-status { grid-column: 2; width: max-content; }.material-edit { grid-template-columns: 1fr; }.wide-field { grid-column: auto; }.material-actions { flex-wrap: wrap; }.sync-state { display:none; }.account-button #accountLabel { display:none; }.migration-banner { align-items:flex-start; flex-direction:column; }.auth-form.compact { grid-template-columns:1fr; }.auth-form.compact button,.auth-form.compact .form-error { grid-column:auto; }.today-learning-stats { grid-template-columns:1fr 1fr; }.today-learning-stats div:last-child { grid-column:1/-1; }.free-practice { padding:20px; }.free-practice-controls>* { flex:1 1 42%; }.answer-actions { grid-template-columns:1fr; }.dont-know-button { padding:11px; }
  .generated-card { display: grid; }.generated-card button { width: 100%; }
  footer { padding-bottom: 90px; flex-direction: column; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }