:root{
  --bg:#f3f1ec;
  --surface:#ffffff;
  --surface-2:#f8f7f4;
  --surface-3:#ece9e2;
  --line:#dedbd3;
  --line-strong:#c9c5bb;
  --text:#20262d;
  --muted:#68717a;
  --accent:#315f7a;
  --accent-strong:#24495f;
  --accent-soft:#e8f0f4;
  --good:#39705a;
  --good-soft:#e9f2ed;
  --warn:#8a652d;
  --warn-soft:#f6efe2;
  --bad:#954b4b;
  --bad-soft:#f7eaea;
  --radius:16px;
  --shadow:0 8px 30px rgba(31,38,45,.07);
}
*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,Arial,sans-serif;
  min-height:100vh;line-height:1.62;-webkit-font-smoothing:antialiased;
  font-size:15px;
}
button,input,textarea{font:inherit}
button{cursor:pointer}
a{color:var(--accent)}
.hidden{display:none!important}
.muted{color:var(--muted)}
.label,.eyebrow{
  color:var(--muted);font-size:11px;font-weight:750;letter-spacing:.08em
}
h1,h2,h3{letter-spacing:-.025em;color:var(--text)}
h1{line-height:1.12}
h2{line-height:1.25}
h3{line-height:1.32}
p{margin-top:.45em}

/* AUTH */
.auth-shell{min-height:100vh;display:grid;place-items:center;padding:22px}
.auth-card{
  width:min(440px,100%);background:var(--surface);border:1px solid var(--line);
  border-radius:22px;padding:30px;box-shadow:var(--shadow)
}
.brand-mark{
  width:48px;height:48px;border-radius:13px;display:grid;place-items:center;
  background:var(--text);color:#fff;font-weight:800;letter-spacing:.05em
}
.auth-card h1{margin:18px 0 6px;font-size:27px}
.tabs{display:flex;gap:7px;margin:22px 0 14px}
.tab,.ghost,.level,.nav{
  border:1px solid var(--line);background:var(--surface);color:var(--muted);
  border-radius:11px;padding:10px 13px
}
.tab.active,.level.active,.nav.active{
  color:var(--accent-strong);background:var(--accent-soft);border-color:#b9ced9
}
.auth-form{display:grid;gap:11px}
.auth-form input{
  width:100%;border:1px solid var(--line);background:var(--surface-2);
  color:var(--text);border-radius:11px;padding:13px 14px;outline:none
}
.auth-form input:focus,.notearea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(49,95,122,.11)}
.primary{
  border:0;background:var(--accent-strong);color:#fff;font-weight:720;
  border-radius:11px;padding:13px 16px
}
.primary:hover{background:#193b50}
.status{min-height:20px;color:var(--warn);font-size:13px}
.contact{
  border-top:1px solid var(--line);margin-top:18px;padding-top:15px;
  display:grid;gap:3px;color:var(--muted);font-size:12px
}
.contact a{color:var(--muted);text-decoration:none}
.legal-note{margin-top:14px;font-size:11px;line-height:1.55;color:#7d858c}
.privacy-notice{
  font-size:12px;line-height:1.5;color:var(--muted);padding:10px 12px;
  border:1px solid var(--line);border-radius:11px;background:var(--surface-2)
}
.consent{display:flex;gap:9px;align-items:flex-start;color:var(--muted);font-size:12px;line-height:1.45}
.consent input{width:auto;margin-top:3px}

/* APP SHELL */
.app{min-height:100vh;display:grid;grid-template-columns:220px minmax(0,1fr);grid-template-rows:76px 1fr}
.topbar{
  grid-column:2;grid-row:1;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:0 30px;border-bottom:1px solid var(--line);background:rgba(243,241,236,.94);
  position:sticky;top:0;z-index:20;backdrop-filter:blur(12px)
}
.title{font-size:20px;font-weight:760;letter-spacing:-.025em}
.top-actions{display:flex;align-items:center;gap:8px}
.badge{
  padding:6px 9px;border-radius:999px;background:var(--good-soft);color:var(--good);
  font-size:11px;font-weight:700
}
.sidebar{
  grid-column:1;grid-row:1/3;position:fixed;inset:0 auto 0 0;width:220px;
  padding:24px 16px;background:#242a30;color:#e8ecef;border-right:1px solid #1d2227;
  display:flex;flex-direction:column;justify-content:space-between;z-index:30
}
.sidebar:before{
  content:"STUDY";display:block;color:#8f9aa3;font-weight:800;font-size:11px;
  letter-spacing:.16em;margin:3px 10px 22px
}
.sidebar nav{display:grid;gap:5px}
.sidebar .nav{
  border:0;background:transparent;color:#aeb7bf;text-align:left;padding:11px 12px;border-radius:10px
}
.sidebar .nav.active{background:#333b43;color:#fff}
.level-switch{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}
.sidebar .level{background:#2b3239;border-color:#3a444d;color:#aeb7bf;padding:8px 5px}
.sidebar .level.active{background:#e9eef1;color:#23323b;border-color:#e9eef1}
.main{grid-column:2;grid-row:2;padding:28px;max-width:1320px;width:100%;margin:0 auto}
.view{width:100%}

/* COMPONENTS */
.grid{display:grid;gap:16px}
.cols2{grid-template-columns:minmax(0,1.6fr) minmax(270px,.8fr)}
.cols3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:0 1px 0 rgba(31,38,45,.02)
}
.metric{font-size:38px;font-weight:780;letter-spacing:-.045em;margin:4px 0}
.smallmetric{font-size:21px;word-break:break-word}
.progressbar{height:7px;background:var(--surface-3);border-radius:999px;overflow:hidden;margin-top:12px}
.progressbar i{display:block;height:100%;background:var(--accent);border-radius:999px}
.topic-list{display:grid;gap:9px}
.topic{
  border:1px solid var(--line);background:var(--surface-2);
  border-radius:12px;padding:14px 15px;color:var(--text)
}
button.topic{width:100%}
.topic:hover{border-color:var(--line-strong)}
.topic-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.topic h3{margin:0;font-size:14px}
.topic p{margin:5px 0 0;font-size:13px;color:var(--muted)}
.pill{
  white-space:nowrap;padding:5px 8px;border-radius:999px;background:var(--surface-3);
  color:#56606a;font-size:10px;font-weight:720
}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:17px}
.ghost{background:var(--surface);color:var(--text)}
.ghost:hover{background:var(--surface-2)}
.empty{padding:28px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:12px}
code{font-family:"SFMono-Regular",Consolas,monospace;font-size:.92em}

/* DASHBOARD / COACH */
.hero-study{
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:18px;
  background:#e9eef1;border:1px solid #cbd8df;border-radius:18px;padding:24px;margin-bottom:16px
}
.hero-study h1{font-size:27px;margin:4px 0 8px}
.hero-study p{margin:0;color:#55646d;max-width:680px}
.hero-study .primary{padding:13px 20px;white-space:nowrap}
.coach-card{border-left:4px solid var(--accent)}
.coach-action{font-weight:660;color:var(--accent-strong)}

/* STUDY */
.study-shell{display:grid;grid-template-columns:300px minmax(0,1fr);gap:16px;align-items:start}
.curriculum{position:sticky;top:96px;padding:14px}
.curriculum-title{padding:5px 7px 12px;border-bottom:1px solid var(--line);margin-bottom:9px}
.curriculum-topic{margin-bottom:7px}
.curriculum-topic-btn{
  width:100%;display:flex;justify-content:space-between;gap:10px;text-align:left;
  border:0;background:transparent;color:var(--text);padding:10px 8px;border-radius:9px;font-weight:700
}
.curriculum-topic-btn:hover,.curriculum-topic-btn.active{background:var(--accent-soft);color:var(--accent-strong)}
.curriculum-lessons{display:grid;gap:3px;padding:1px 0 7px 8px}
.curriculum-lesson{
  width:100%;text-align:left;border:0;border-left:2px solid var(--line);
  background:transparent;color:var(--muted);padding:8px 10px;font-size:12px
}
.curriculum-lesson.active{border-left-color:var(--accent);color:var(--accent-strong);background:#f2f6f8}
.curriculum-lesson.done:after{content:" ✓";color:var(--good)}
.lesson{padding:30px}
.lesson h2{font-size:27px;margin:7px 0 2px}
.lesson h3{font-size:15px;margin:27px 0 8px}
.lesson p,.lesson li{font-size:15px;line-height:1.78}
.lesson ul{padding-left:20px}
.lesson-lead{
  font-size:16px!important;line-height:1.82!important;color:#333b42;
  padding-bottom:20px;border-bottom:1px solid var(--line)
}
.highyield,.calculator{
  background:var(--surface-2);border:1px solid var(--line);border-radius:12px;
  padding:14px 16px
}
.highyield ul{margin:0}
.calculator{font-family:"SFMono-Regular",Consolas,monospace;font-size:12px;line-height:1.65}
.notearea{
  width:100%;min-height:150px;resize:vertical;border:1px solid var(--line);
  background:var(--surface-2);color:var(--text);border-radius:12px;padding:14px;outline:none;line-height:1.6
}

/* QUIZ / EXAMS */
.quiz-card{max-width:900px;margin:0 auto;padding:28px}
.qmeta{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:17px}
.question{font-size:20px;font-weight:700;line-height:1.48;letter-spacing:-.015em}
.translation{
  margin-top:10px;padding:13px 15px;background:var(--surface-2);border-left:3px solid var(--line-strong);
  color:#505960;border-radius:0 10px 10px 0
}
.answers{display:grid;gap:9px;margin-top:20px}
.answer{
  border:1px solid var(--line);background:var(--surface);text-align:left;color:var(--text);
  border-radius:12px;padding:14px 15px;line-height:1.45
}
.answer:hover{border-color:#9cafba;background:#f8fafb}
.answer.correct{border-color:#8bb9a4;background:var(--good-soft)}
.answer.wrong{border-color:#d1a1a1;background:var(--bad-soft)}
.answer.selected{border-color:var(--accent);background:var(--accent-soft)}
.explain{
  margin-top:18px;border:1px solid var(--line);background:var(--surface-2);
  border-radius:12px;padding:16px
}
.exam-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.exam-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}
.timer{font-variant-numeric:tabular-nums;font-weight:750;font-size:18px;color:var(--accent-strong)}
.exam-answer{min-height:240px}
.exam-history{margin-top:22px}

/* SOURCES / LEGAL */
.source{
  display:block;padding:11px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--accent-strong)
}
.legal-page{max-width:900px;margin:0 auto;padding:32px 16px}
.legal-doc{padding:30px}
.legal-doc h1{font-size:29px}
.legal-doc h2{font-size:18px;margin-top:28px}
.legal-doc p{line-height:1.75;color:#414a52}
.danger{border-color:#d6b6b6;color:var(--bad)}

@media(max-width:980px){
  .app{grid-template-columns:1fr;grid-template-rows:68px 1fr 66px}
  .sidebar{
    position:fixed;top:auto;bottom:0;left:0;right:0;width:auto;height:66px;
    padding:7px 8px calc(7px + env(safe-area-inset-bottom));background:#242a30;
    display:block;border-right:0;border-top:1px solid #171b1f
  }
  .sidebar:before,.level-switch{display:none}
  .sidebar nav{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}
  .sidebar .nav{
    padding:8px 2px;text-align:center;font-size:10px;white-space:nowrap;
    overflow:hidden;text-overflow:ellipsis
  }
  .topbar{grid-column:1;grid-row:1;padding:0 16px}
  .main{grid-column:1;grid-row:2;padding:16px 14px 90px}
  .cols3{grid-template-columns:1fr}
  .cols2{grid-template-columns:1fr}
  .study-shell{grid-template-columns:1fr}
  .curriculum{position:static}
  .hero-study{grid-template-columns:1fr}
  .hero-study .primary{width:100%}
  .exam-grid{grid-template-columns:1fr}
}
@media(max-width:560px){
  body{font-size:14px}
  .auth-shell{padding:14px}
  .auth-card{padding:22px;border-radius:18px}
  .auth-card h1{font-size:24px}
  .topbar .eyebrow{display:none}
  .title{font-size:18px}
  .top-actions .ghost{padding:8px 9px;font-size:11px}
  .badge{display:none}
  .main{padding:13px 11px 88px}
  .card{padding:17px;border-radius:14px}
  .hero-study{padding:19px}
  .hero-study h1{font-size:23px}
  .lesson{padding:20px}
  .lesson h2{font-size:24px}
  .lesson p,.lesson li{font-size:15px;line-height:1.78}
  .question{font-size:18px}
  .quiz-card{padding:19px}
  .sidebar .nav{font-size:9px}
}

/* Public project dashboard */
.landing{min-height:100vh;display:flex;flex-direction:column;background:#f4f3ef;color:#1f252a}
.landing-topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(22px,5vw,72px);border-bottom:1px solid #ddd9d0}
.landing-name{color:inherit;text-decoration:none;font-size:15px;font-weight:700;letter-spacing:-.01em}
.landing-actions{display:flex;align-items:center;gap:7px;color:#8a8d90;font-size:12px}
.lang-btn{border:0;background:transparent;color:#8a8d90;padding:8px 4px;font-size:12px;font-weight:700;letter-spacing:.06em}
.lang-btn.active{color:#1f252a}
.landing-main{width:min(1180px,calc(100% - 44px));margin:0 auto;flex:1;padding:clamp(70px,10vw,138px) 0 76px}
.landing-intro{max-width:660px;margin-bottom:56px}
.landing-intro h1{font-size:clamp(38px,6vw,76px);line-height:1.02;letter-spacing:-.055em;margin:0 0 22px;font-weight:680}
.landing-intro p{font-size:clamp(16px,2vw,20px);line-height:1.6;color:#6f7478;max-width:610px;margin:0}
.product-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.product-card{position:relative;display:flex;flex-direction:column;min-height:330px;padding:28px;border:1px solid #d9d6cf;border-radius:20px;background:rgba(255,255,255,.72);color:inherit;text-decoration:none;overflow:hidden;transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease}
.product-card:before{content:"";position:absolute;inset:auto -50px -80px auto;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(49,95,122,.09),rgba(49,95,122,0) 70%);transition:transform .35s ease}
.product-card:hover{transform:translateY(-4px);border-color:#bbb7ae;box-shadow:0 18px 50px rgba(31,37,42,.08)}
.product-card:hover:before{transform:scale(1.18)}
.product-meta{display:flex;justify-content:space-between;color:#909497;font-size:10px;font-weight:800;letter-spacing:.09em}
.product-card h2{font-size:26px;letter-spacing:-.035em;margin:72px 0 12px}
.product-card p{margin:0;color:#6d7276;line-height:1.65;max-width:31ch}
.product-link{margin-top:auto;padding-top:30px;font-weight:700;font-size:13px}
.product-study{background:#20262d;color:#f7f6f2;border-color:#20262d}
.product-study p,.product-study .product-meta{color:#aeb5bb}
.product-study:before{background:radial-gradient(circle,rgba(255,255,255,.10),rgba(255,255,255,0) 70%)}
.landing-footer{display:flex;justify-content:space-between;gap:20px;padding:24px clamp(22px,5vw,72px);border-top:1px solid #ddd9d0;color:#8a8d90;font-size:12px}
.landing-footer a{color:inherit;text-decoration:none}
@media(max-width:820px){
  .product-grid{grid-template-columns:1fr}
  .product-card{min-height:250px}
  .product-card h2{margin-top:48px}
}
@media(max-width:520px){
  .landing-topbar{height:66px}
  .landing-main{width:min(100% - 28px,1180px);padding-top:62px}
  .landing-intro{margin-bottom:36px}
  .landing-footer{flex-direction:column}
}

.lesson-sections{display:grid;gap:18px;margin:18px 0 28px}
.lesson-section{padding:20px 22px;border:1px solid var(--line);border-radius:14px;background:var(--surface-2)}
.lesson-section h3{margin-top:0}
.lesson-section p{margin:0 0 12px;line-height:1.78}
.lesson-section p:last-child{margin-bottom:0}
.exam-method{padding:20px 22px;border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:0 12px 12px 0;line-height:1.75}
.example-box p{margin-bottom:0}

.mba-mark{width:30px;height:30px;display:inline-grid;place-items:center;border-radius:8px;background:#20262d;color:#f4f3ef;font-size:9px;font-weight:850;letter-spacing:-.04em;box-shadow:inset 0 0 0 1px rgba(255,255,255,.05)}
.landing-name{display:inline-flex;align-items:center;gap:10px}
.landing-contact{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.contact-link{display:inline-flex;align-items:center;gap:8px;color:inherit!important;text-decoration:none}
.mail-icon{width:22px;height:22px;border-radius:6px;display:grid;place-items:center;background:#fff;border:1px solid #ddd9d0;color:#c84f43;font-size:12px;font-weight:800}
.linkedin-icon{width:22px;height:22px;border-radius:5px;display:grid;place-items:center;background:#0a66c2;color:#fff;font-size:11px;font-weight:800;font-family:Arial,sans-serif}
@media(max-width:620px){.landing-contact{align-items:flex-start;flex-direction:column;gap:8px}}

.video-resources{display:grid;gap:9px;margin-top:8px}
.video-resource{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);color:var(--text);text-decoration:none;font-weight:650}
.video-resource:hover{border-color:var(--line-strong);background:#fbfaf7}
.resource-note{margin:2px 2px 0!important;font-size:11px!important;line-height:1.55!important;color:var(--muted)}

.admin-table{display:grid;gap:12px;margin-top:18px}
.admin-user{border:1px solid var(--line);border-radius:14px;background:var(--surface-2);padding:16px}
.admin-user-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
.admin-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}
.admin-pass{flex:1 1 180px;min-width:0;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:10px 12px}
@media(max-width:560px){.admin-actions{display:grid;grid-template-columns:1fr}.admin-user-head{flex-direction:column}.sidebar nav{grid-template-columns:repeat(8,1fr)}}

.brand-mark-mba{font-size:12px;letter-spacing:-.04em}

/* mobile-nav-scroll-fix */
@media(max-width:980px){
  .sidebar{overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}
  .sidebar nav{display:flex;gap:2px;min-width:max-content}
  .sidebar .nav{flex:0 0 76px;min-width:76px}
}
@media(max-width:560px){
  .sidebar .nav{flex-basis:70px;min-width:70px;font-size:9px}
  .top-actions{gap:5px}
  .top-actions .ghost{min-height:38px}
  .product-card{min-height:230px}
}

/* mastery and learning analytics */
.mastery-card{overflow:hidden}
.mastery-summary{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:16px 0}
.mastery-summary.compact{grid-template-columns:repeat(3,minmax(0,1fr))}
.mastery-summary>div{border:1px solid var(--line);background:var(--surface-2);border-radius:12px;padding:12px;display:grid;gap:2px}
.mastery-summary strong{font-size:22px;letter-spacing:-.035em}
.mastery-summary span{font-size:11px;color:var(--muted)}
.gap-list{display:grid;gap:8px}
.gap-row{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:12px 13px;color:var(--text)}
.gap-row:hover{border-color:var(--line-strong);background:var(--surface-2)}
.gap-row>span:first-child{display:grid;gap:2px}
.gap-row small{color:var(--muted)}
.mastery-pill{white-space:nowrap;border-radius:999px;padding:5px 8px;font-size:10px;font-weight:750;background:var(--surface-3);color:var(--muted)}
.mastery-mastered{background:var(--good-soft);color:var(--good)}
.mastery-proficient{background:var(--accent-soft);color:var(--accent-strong)}
.mastery-due{background:var(--warn-soft);color:var(--warn)}
.mastery-weak{background:var(--bad-soft);color:var(--bad)}
.mastery-learning,.mastery-not-started{background:var(--surface-3);color:var(--muted)}
.curriculum-lesson{display:flex;align-items:center;justify-content:space-between;gap:8px}
.mastery-dot{width:8px;height:8px;border-radius:999px;flex:0 0 8px;background:#b8bec3}
.mastery-dot.mastery-mastered{background:var(--good)}
.mastery-dot.mastery-proficient{background:var(--accent)}
.mastery-dot.mastery-due{background:var(--warn)}
.mastery-dot.mastery-weak{background:var(--bad)}
.practice-hub,.mastery-dashboard{display:grid;gap:16px}
.practice-actions{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}
.mastery-topic-list{display:grid;gap:10px}
.mastery-topic{border:1px solid var(--line);background:var(--surface-2);border-radius:12px;padding:13px}
.mastery-topic h3{margin:0;font-size:14px}
.mastery-topic p{margin:7px 0 0;color:var(--muted);font-size:12px}
.mastery-track{height:6px;background:var(--surface-3);border-radius:999px;overflow:hidden;margin-top:9px}
.mastery-track i{display:block;height:100%;background:var(--accent);border-radius:999px}
.quick-sheet{margin-top:28px;padding:18px 20px;border:1px solid #cbd8df;border-radius:14px;background:#eef3f5}
.quick-sheet h3{margin:4px 0 10px}
.quick-sheet ul{margin:0 0 12px;padding-left:20px}
.quick-strip{padding:9px 0;border-top:1px solid #d4dfe4;font-size:13px}
.backup-history{margin:12px 0}
.backup-list{display:grid;gap:6px}
.backup-list>div{display:flex;justify-content:space-between;gap:12px;padding:8px 10px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);font-size:12px}
@media(max-width:760px){
  .mastery-summary{grid-template-columns:repeat(2,minmax(0,1fr))}
  .mastery-summary.compact{grid-template-columns:repeat(3,minmax(0,1fr))}
  .gap-row{align-items:flex-start}
}
@media(max-width:430px){
  .mastery-summary.compact{grid-template-columns:1fr}
  .gap-row{display:grid}
  .mastery-pill{justify-self:start}
}

.hero-actions{display:grid;gap:8px;min-width:190px}
.hero-actions .ghost,.hero-actions .primary{width:100%}
@media(max-width:980px){.hero-actions{width:100%;min-width:0}}

/* structured study workspace */
.workspace-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-end;margin-bottom:16px}
.workspace-head h2{margin:3px 0 6px;font-size:28px;letter-spacing:-.035em}
.map-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:18px}
.map-card{position:relative;min-height:170px;border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:18px;text-align:left;color:var(--text);display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.map-card:hover{transform:translateY(-1px);border-color:var(--line-strong);background:#fff}
.map-card strong{font-size:16px}
.map-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.55}
.map-arrow{position:absolute;right:16px;bottom:14px;font-size:18px}
.map-icon{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-strong);font-weight:800;font-size:17px}
.topic-library{margin-top:0}
.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:14px}
.guide-card{display:flex;align-items:center;gap:11px;text-align:left;border:1px solid var(--line);background:var(--surface-2);border-radius:12px;padding:12px;color:var(--text)}
.guide-card span:last-child{display:grid;gap:2px}
.guide-card small{color:var(--muted)}
.guide-icon{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;background:#fff;border:1px solid var(--line)}
.deep-guide{margin-top:18px;padding:22px;border:1px solid var(--line);border-radius:16px;background:#fff}
.deep-guide-title{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.deep-guide-title h2{margin:2px 0 0}
.deep-guide section{padding-top:8px}
.deep-guide section+section{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}
.deep-guide p{line-height:1.75}
.lesson-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}
.lesson-heading h2{margin-bottom:3px}
.calc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-bottom:16px}
.calc-card{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:18px}
.calc-title{display:flex;gap:11px;align-items:center}
.calc-title h3{margin:0 0 2px}
.calc-title small{color:var(--muted)}
.keystrokes{display:grid;gap:6px;margin:14px 0;padding-left:22px}
.keystrokes code{display:inline-block;background:#20262d;color:#f7f7f4;border-radius:7px;padding:5px 8px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}
.calc-trap{margin-top:12px;padding:10px 12px;border-radius:10px;background:#fff5df;border:1px solid #ead8af;font-size:12px;line-height:1.5}
.calc-example-grid{display:grid;gap:9px;margin-top:12px}
.calc-example{border:1px solid var(--line);border-radius:12px;background:var(--surface-2);padding:0}
.calc-example summary{cursor:pointer;display:grid;gap:4px;padding:13px 14px}
.calc-example summary span{font-size:12px;color:var(--muted);font-weight:400}
.calc-example>div{padding:0 14px 14px;border-top:1px solid var(--line)}
.quickwin-head{padding:2px 0}
.quickwin-topics{display:grid;gap:16px}
.quickwin-topic{border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:18px}
.quickwin-topic-head{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.quickwin-topic-head h2{margin:0}
.quickwin-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.quickwin-group{border:1px solid var(--line);background:var(--surface-2);border-radius:12px;padding:14px}
.quickwin-group h3{margin:0 0 8px}
.quickwin-group ul{margin:0;padding-left:18px}
.quickwin-group li{margin:6px 0;line-height:1.5}
@media(max-width:1100px){.map-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:820px){.map-grid,.calc-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.quickwin-groups{grid-template-columns:1fr}.lesson-heading{display:grid}}
@media(max-width:560px){.map-grid,.calc-grid,.guide-grid{grid-template-columns:1fr}.map-card{min-height:145px}.workspace-head h2{font-size:24px}.deep-guide{padding:16px}.quickwin-topic{padding:14px}}

.lesson-tools{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}
@media(max-width:820px){.lesson-tools{justify-content:flex-start}}

/* personal PDF study library */
.pdf-library-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}
.pdf-card{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);background:var(--surface-2);border-radius:13px;padding:13px;color:var(--text)}
.pdf-card>span:nth-child(2){display:grid;gap:3px;min-width:0;flex:1}
.pdf-card strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pdf-card small{color:var(--muted)}
.pdf-studio{margin-top:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:16px}
.pdf-studio-head h2{margin:3px 0}
.pdf-toolbar{display:flex;align-items:center;gap:7px;flex-wrap:wrap;padding:10px 0 14px}
.pdf-toolbar .active{background:var(--accent-soft);border-color:#b9cbd5;color:var(--accent-strong)}
.pdf-link{text-decoration:none;display:inline-flex;align-items:center}
.pdf-save{font-size:11px;color:var(--muted);margin-left:auto}
.pdf-workarea{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:14px;align-items:start}
.pdf-page-panel{min-width:0;border:1px solid var(--line);border-radius:12px;background:#d9dde0;padding:10px;overflow:auto;max-height:78vh}
.pdf-canvas-wrap{display:flex;justify-content:center;min-width:max-content}
.pdf-canvas-stack{position:relative;box-shadow:0 8px 22px rgba(0,0,0,.16);background:white}
.pdf-canvas-stack canvas{display:block}
#pdfInk{position:absolute;inset:0;touch-action:none;cursor:crosshair}
.pdf-notes{position:sticky;top:76px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);padding:12px}
.pdf-notes textarea{width:100%;min-height:220px;resize:vertical;border:1px solid var(--line);border-radius:10px;padding:10px;background:#fff;color:var(--text);font:inherit;line-height:1.55}
@media(max-width:900px){.pdf-workarea{grid-template-columns:1fr}.pdf-notes{position:static}.pdf-page-panel{max-height:none}.pdf-save{width:100%;margin-left:0}}
@media(max-width:560px){.pdf-library-grid{grid-template-columns:1fr}.pdf-studio{padding:10px}.pdf-toolbar .ghost,.pdf-toolbar .pdf-link{min-height:36px;padding:7px 9px}.pdf-notes textarea{min-height:150px}}

/* bilingual lesson and professional QuickWin */
.study-language-switch{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:11px;background:var(--surface-2);margin:16px 0 6px}
.study-lang{border:0;background:transparent;color:var(--muted);padding:8px 12px;border-radius:8px;font-weight:700;cursor:pointer}
.study-lang.active{background:var(--text);color:#fff}
.english-reading{display:grid;gap:14px}
.source-alignment{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:14px 16px;border:1px solid #cbd8df;border-radius:13px;background:#f1f6f8}
.source-alignment h3{margin:3px 0 0}
.source-chip{max-width:48%;font-size:11px;line-height:1.45;color:var(--accent-strong);background:#fff;border:1px solid #cbd8df;border-radius:999px;padding:7px 10px;text-align:right}
.quickwin-badge{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:7px 10px;background:var(--surface)}
.quickwin-code{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;background:#20262d;color:#fff;font-weight:850;font-size:11px;letter-spacing:.04em}
.quickwin-topic{box-shadow:none}
.quickwin-group{background:#fafaf8}
.quickwin-group h3{font-size:13px;letter-spacing:-.01em}
.quickwin-group li{font-size:13px}
@media(max-width:680px){.source-alignment{display:grid}.source-chip{max-width:none;text-align:left}.study-language-switch{display:grid;grid-template-columns:1fr 1fr;width:100%}.study-lang{width:100%}.quickwin-badge{display:none}}

/* Savas study companion */
.savas{margin-top:16px;border:1px solid #c8d6de;border-radius:14px;background:#f4f8fa;padding:16px}
.savas-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
.savas-head h3{margin:3px 0 4px;font-size:18px}
.savas-head p{margin:0;max-width:760px}
.savas-controls{display:flex;gap:8px;align-items:end;flex-wrap:wrap;margin-top:14px}
.savas-controls label{display:grid;gap:4px;font-size:11px;color:var(--muted)}
.savas-controls input{width:94px;border:1px solid var(--line);border-radius:9px;padding:8px 9px;background:#fff}
.savas-presets{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}
.savas-preset{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:999px;padding:7px 10px;font-size:11px;font-weight:700}
.savas-preset.active{background:var(--text);color:#fff;border-color:var(--text)}
.savas-request{width:100%;min-height:110px;margin-top:12px;border:1px solid var(--line);border-radius:11px;background:#fff;padding:12px;color:var(--text);font:inherit;line-height:1.55;resize:vertical}
.savas-run{display:flex;align-items:center;gap:12px;margin-top:10px;flex-wrap:wrap}
.savas-trace{margin-top:12px;border:1px solid var(--line);border-radius:11px;background:#fff;overflow:hidden}
.savas-trace summary{cursor:pointer;padding:10px 12px;font-size:12px;font-weight:800;color:var(--text)}
.savas-trace-list{display:grid;gap:7px;padding:0 12px 12px}
.savas-trace-row{display:grid;grid-template-columns:8px 1fr auto;gap:8px;align-items:start;color:var(--muted);font-size:11px}
.savas-trace-dot{width:7px;height:7px;border-radius:50%;background:#8a9aa3;margin-top:5px}
.savas-trace-row.done{color:#4e5d66}.savas-trace-row.done .savas-trace-dot{background:var(--accent)}
.savas-trace-row strong{display:block;font-size:12px;color:inherit}.savas-trace-row small{display:block;margin-top:2px}.savas-trace-row time{white-space:nowrap;font-size:10px;opacity:.75}
.savas-result{word-break:normal;overflow-wrap:anywhere;margin:14px 0 0;border:1px solid var(--line);border-radius:11px;background:#fff;padding:16px;min-height:0;max-height:620px;overflow:auto;font-family:inherit;font-size:13px;line-height:1.68}
.savas-result:empty{display:none}
.savas-rich-heading{margin:18px 0 8px;font-weight:800;line-height:1.3;color:var(--text)}
.savas-rich-heading:first-child{margin-top:0}.savas-rich-heading.level-1{font-size:17px}.savas-rich-heading.level-2{font-size:15px}.savas-rich-heading.level-3{font-size:14px}
.savas-rich-paragraph{margin:7px 0;color:var(--text)}
.savas-rich-bullet{display:grid;grid-template-columns:20px minmax(0,1fr);gap:4px;margin:5px 0;align-items:start}
.savas-rich-bullet>span{color:var(--accent);font-weight:800}.savas-rich-bullet.numbered>span{color:var(--muted)}
.savas-gap{height:6px}.savas-page-ref{display:inline-block;padding:1px 6px;border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:.86em;font-weight:700}
.savas-formula{margin:9px 0;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;overflow-wrap:anywhere}
.savas-quote{margin:9px 0;padding:8px 12px;border-left:3px solid var(--accent);background:var(--surface-2);color:var(--muted)}
.savas-result code,.savas-history-response code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-2);padding:1px 4px;border-radius:5px}
.savas-history{margin-top:16px;padding-top:13px;border-top:1px solid #cfdae0}
.savas-history-item{border:1px solid var(--line);border-radius:10px;background:#fff;margin-top:7px}
.savas-history-item summary{cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:10px 12px}
.savas-history-item summary span,.savas-history-item summary small{color:var(--muted);font-size:11px}
.savas-history-response{margin:0;padding:12px;border-top:1px solid var(--line);font-family:inherit;font-size:12px;line-height:1.62;overflow-wrap:anywhere}
@media(max-width:620px){.savas-head{display:grid}.savas-controls{display:grid;grid-template-columns:1fr 1fr}.savas-controls label input{width:100%}.savas-controls .ghost{grid-column:1/-1}.savas-history-item summary{grid-template-columns:1fr}.savas-presets{display:grid;grid-template-columns:1fr 1fr}}


/* grouped workspaces */
.workspace-tabs{
  display:flex;gap:7px;flex-wrap:wrap;margin:0 0 16px;padding:5px;
  border:1px solid var(--line);border-radius:13px;background:var(--surface-2)
}
.workspace-tab{
  border:0;background:transparent;color:var(--muted);border-radius:9px;
  padding:9px 13px;font-weight:700
}
.workspace-tab:hover{background:var(--surface)}
.workspace-tab.active{background:var(--text);color:#fff}

/* compact public resources */
.public-resources{margin-top:16px;padding:0;overflow:hidden}
.public-resources summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding:16px 18px
}
.public-resources summary::-webkit-details-marker{display:none}
.public-resources summary>span:first-child{display:grid;gap:2px}
.public-resources summary strong{font-size:15px}
.public-resources .collapse-arrow{font-size:19px;line-height:1;color:var(--muted);transition:transform .15s ease}
.public-resources[open] .collapse-arrow{transform:rotate(180deg)}
.public-resources-body{padding:0 18px 18px;border-top:1px solid var(--line)}
@media(max-width:560px){
  .workspace-tabs{display:grid;grid-template-columns:1fr 1fr}
  .workspace-tab{width:100%}
  .public-resources summary{padding:14px}
  .public-resources-body{padding:0 14px 14px}
}


/* ONLINE PRESENCE */
.presence-panel{
  position:fixed;right:16px;top:92px;width:230px;max-height:calc(100vh - 116px);
  z-index:18;background:rgba(255,255,255,.96);border:1px solid var(--line);
  border-radius:14px;box-shadow:0 12px 34px rgba(31,38,45,.09);overflow:hidden;
  backdrop-filter:blur(12px)
}
.presence-panel.collapsed{width:auto;background:transparent;border:0;box-shadow:none;overflow:visible}
.presence-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 12px;border-bottom:1px solid var(--line)}
.presence-head>div{display:grid;gap:2px}.presence-head strong{font-size:13px}.presence-head span{font-size:10px;color:var(--muted)}
.presence-hide,.presence-reopen{border:1px solid var(--line);background:var(--surface);color:var(--text)}
.presence-hide{width:30px;height:30px;padding:0;border-radius:8px;font-size:20px;line-height:1}
.presence-list{padding:8px;display:grid;gap:4px;overflow:auto;max-height:calc(100vh - 180px)}
.presence-user{display:flex;align-items:center;gap:8px;padding:8px 7px;border-radius:9px;font-size:12px}
.presence-user:hover{background:var(--surface-2)}
.presence-dot{width:8px;height:8px;border-radius:50%;background:var(--good);box-shadow:0 0 0 3px var(--good-soft);flex:0 0 auto}
.presence-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.presence-name small{color:var(--muted);font-size:10px}
.presence-empty{padding:12px;color:var(--muted);font-size:11px;text-align:center}
.presence-reopen{display:flex;align-items:center;gap:8px;padding:9px 11px;border-radius:999px;font-size:11px;font-weight:700;box-shadow:0 8px 24px rgba(31,38,45,.08)}
@media(min-width:1180px){
  .main{padding-right:278px;max-width:1580px}
}
@media(max-width:1179px){
  .presence-panel{right:12px;top:82px;width:210px}
  .presence-panel.collapsed{width:auto}
}
@media(max-width:700px){
  .presence-panel{right:10px;top:76px;width:min(220px,calc(100vw - 20px));max-height:52vh}
  .presence-list{max-height:calc(52vh - 58px)}
  .presence-panel.collapsed{width:auto}
}

/* AUTHORIZED WORKSPACE */
.entry-link{border:0;background:transparent;color:#5f666c;padding:8px 4px;font-size:12px;font-weight:700;cursor:pointer}
.entry-link:hover{color:#1f252a}.landing-sep{color:#b5b0a8}
.entry-modal{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:20px}
.entry-backdrop{position:absolute;inset:0;background:rgba(18,22,25,.38);backdrop-filter:blur(5px)}
.entry-card{position:relative;z-index:1;width:min(420px,100%);background:#fff;border:1px solid #d9d6cf;border-radius:20px;padding:28px;box-shadow:0 24px 70px rgba(20,24,28,.2)}
.entry-card h2{margin:7px 0 20px;font-size:25px}.entry-card form{display:grid;gap:14px}.entry-card label{display:grid;gap:6px;font-size:12px;color:#5d6469}
.entry-card input{width:100%;border:1px solid #d9d6cf;border-radius:10px;padding:11px 12px;background:#fbfaf7;color:#1f252a}
.entry-close{position:absolute;right:14px;top:12px;width:34px;height:34px;border:0;background:transparent;color:#7a8085;font-size:24px;cursor:pointer}
.product-workspace{border-style:dashed}
@media(max-width:640px){
  .landing-actions{gap:5px}.entry-link{font-size:11px}.landing-sep{display:none}
  .entry-card{padding:22px;border-radius:16px}
}

.brand-mark-image{display:block;width:48px;height:48px;object-fit:contain;border-radius:12px;background:transparent}
.mba-mark-image{object-fit:contain;background:transparent;box-shadow:none}

/* modern contact surfaces */
.landing-contact{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.contact-chip{
  display:inline-flex;align-items:center;gap:10px;min-width:0;
  padding:9px 12px;border:1px solid var(--line);border-radius:12px;
  background:rgba(255,255,255,.72);color:var(--text)!important;text-decoration:none;
  transition:transform .16s ease,border-color .16s ease,background .16s ease,box-shadow .16s ease
}
.contact-chip:hover{
  transform:translateY(-1px);border-color:var(--line-strong);background:#fff;
  box-shadow:0 8px 24px rgba(31,38,45,.07)
}
.contact-chip>span:last-child{display:grid;gap:1px;min-width:0}
.contact-chip small{font-size:9px;letter-spacing:.09em;color:var(--muted);font-weight:800}
.contact-chip strong{font-size:11px;font-weight:650;white-space:nowrap}
.contact-chip-icon{width:28px;height:28px;display:grid;place-items:center;flex:0 0 auto;border-radius:8px}

.contact-card{
  border:1px solid var(--line);margin-top:18px;padding:12px;border-radius:14px;
  background:linear-gradient(180deg,rgba(255,255,255,.9),rgba(250,249,246,.9));
  display:grid;gap:11px;color:var(--text);font-size:12px
}
.contact-owner{display:flex;align-items:center;gap:10px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.contact-owner img{width:34px;height:34px;border-radius:9px;object-fit:contain}
.contact-owner span{display:grid;gap:1px}
.contact-owner small{font-size:9px;letter-spacing:.11em;color:var(--muted);font-weight:800}
.contact-owner strong{font-size:13px;color:var(--text)}
.contact-card-links{display:grid;gap:6px}
.contact-card-links a{
  display:flex;align-items:center;gap:8px;padding:7px 8px;border-radius:9px;
  color:var(--muted);text-decoration:none;transition:background .15s ease,color .15s ease
}
.contact-card-links a:hover{background:var(--surface-2);color:var(--text)}
.contact-mini-icon{
  width:24px;height:24px;border-radius:7px;display:grid;place-items:center;
  border:1px solid var(--line);background:#fff;font-size:11px;flex:0 0 auto
}
.linkedin-mini{background:#0a66c2;color:#fff;border-color:#0a66c2;font-family:Arial,sans-serif;font-weight:800}

@media(max-width:620px){
  .landing-contact{align-items:stretch;flex-direction:column;width:100%}
  .contact-chip{width:100%}
  .contact-chip strong{white-space:normal;overflow-wrap:anywhere}
}

.auth-title-clean{margin-top:0!important}

/* mobile interaction hardening */
html,body{max-width:100%;overflow-x:hidden}
img,svg,video,canvas{max-width:100%}
pre,code,.smallmetric,.topic p,.lesson-section,.deep-guide,.contact-chip strong,.contact-card-links a span:last-child{overflow-wrap:anywhere;word-break:break-word}
@media(max-width:700px){
  input,textarea,select{font-size:16px!important}
  button,.primary,.ghost,.tab,.nav,.level,.study-lang,.workspace-tab,.savas-preset,.contact-chip{min-height:44px}
  .main{padding-left:14px;padding-right:14px}
  .topbar{padding-left:14px;padding-right:14px}
  .auth-shell{padding:14px}
  .auth-card{padding:22px 18px;border-radius:18px}
  .landing-topbar{padding-left:14px;padding-right:14px}
  .landing-footer{gap:14px}
}
@media(max-width:430px){
  .auth-card h1{font-size:24px}
  .entry-card{width:100%}
  .contact-card-links a{align-items:flex-start}
}