:root{--blue:#2563eb;--teal:#0d9488;--ink:#152b45;--muted:#617187;--bg:#f4f8fc;--line:#e2eaf3;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:#fff;color:var(--ink);font-size:15px;line-height:1.65}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.container{max-width:1140px;margin:auto;padding-left:24px;padding-right:24px}.site-header{background:white;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav{display:flex;align-items:center;justify-content:space-between;min-height:78px;gap:20px}.brand{display:inline-flex;align-items:center;gap:11px;font-weight:850;font-size:24px;letter-spacing:-1.2px;line-height:1.1}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:43px;height:43px;background:var(--blue);color:white;border-radius:12px;font-size:17px;letter-spacing:-.6px}.brand-blue{color:var(--blue)}.brand small{display:block;font-size:10px;font-weight:600;letter-spacing:.35px;color:var(--muted);margin-top:5px}.nav nav{display:flex;gap:30px;align-items:center}.nav nav a{font-size:13px;font-weight:700;color:#53657c}.nav nav a:hover,.nav nav a.active{color:var(--blue)}.menu{display:none;background:none;border:0;font-size:25px}.hero{background:linear-gradient(116deg,#f3f8ff 0%,#f5fbfa 100%);padding:84px 0 88px}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center}.eyebrow{font-size:11px;font-weight:850;letter-spacing:1.8px;color:var(--teal)}h1,h2,h3{line-height:1.18;letter-spacing:-.045em}h1{font-size:clamp(38px,4.8vw,63px);margin:20px 0 20px;font-weight:850}h1 em{color:var(--blue);font-style:normal}h2{font-size:clamp(28px,3.1vw,39px);margin:12px 0 16px}h3{font-size:20px;margin:13px 0}.lead{font-size:17px;max-width:570px;color:var(--muted);line-height:1.8}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{border:1px solid transparent;border-radius:12px;padding:13px 21px;display:inline-flex;align-items:center;justify-content:center;gap:12px;font-size:13px;font-weight:800;transition:transform .15s,background .15s}.btn:hover{transform:translateY(-2px)}.btn.primary{background:var(--blue);color:white}.btn.secondary{background:white;border-color:#d9e3ee;color:var(--ink)}.btn.teal{background:var(--teal);color:white}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:29px;color:#52677c;font-size:12px;font-weight:650}.trust span::first-letter{color:var(--teal)}.hero-visual{position:relative}.hero-visual:before{content:'';position:absolute;inset:-25px -15px 20px 30px;background:radial-gradient(ellipse,#d4e9ff,transparent 68%);z-index:0}.exam-card{position:relative;background:white;border:1px solid #e0e8f3;border-radius:20px;padding:29px;box-shadow:0 24px 65px #1b4c8120}.exam-top,.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.pill{font-size:10px;letter-spacing:.8px;font-weight:800;color:var(--blue);background:#eaf1ff;border-radius:20px;padding:6px 10px}.number{font-size:11px;color:#8493a5;font-weight:750}.mini-progress{background:#e8eef5;height:6px;border-radius:10px;margin:21px 0}.mini-progress i{display:block;width:22%;height:100%;background:var(--teal);border-radius:10px}.exam-card h3{font-size:21px;margin-bottom:22px}.fake-option{border:1px solid #e2eaf3;border-radius:10px;padding:12px 14px;display:flex;align-items:center;gap:14px;color:#718095;font-weight:750;margin-bottom:10px;font-size:13px}.fake-option span{color:#334b65;font-weight:600}.fake-option.correct{background:#e8f8f3;border-color:#64c9b4;color:var(--teal)}.fake-option.correct span{color:#176d5b}.fake-option b{margin-left:auto}.correct-note{font-size:11px;background:#edf9f5;color:#087965;padding:12px;border-radius:9px;margin-top:15px;font-weight:700}.section{padding-top:75px;padding-bottom:75px}.section-heading{text-align:center;max-width:650px;margin:0 auto 36px}.section-heading p,.page-intro p{color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.feature{padding:28px;background:white;border:1px solid var(--line);border-radius:17px;box-shadow:0 8px 25px #1b4c8108;transition:transform .15s,border .15s}.feature:hover{transform:translateY(-3px);border-color:#b3d1f8}.feature p{font-size:14px;color:var(--muted);min-height:65px}.feature strong,.text-link{color:var(--blue);font-size:13px;font-weight:800}.feature-icon{width:47px;height:47px;border-radius:13px;display:flex;align-items:center;justify-content:center;font-size:23px;font-weight:800}.feature-icon.blue{background:#eaf1ff;color:var(--blue)}.feature-icon.teal{background:#e4f7f3;color:var(--teal)}.feature-icon.amber{background:#fff4d9;color:#c88b00}.split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:80px;background:#fff}.split p{color:var(--muted);max-width:490px}.stats-panel{background:var(--bg);border-radius:18px;padding:25px;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;text-align:center}.stats-panel span{display:block;font-size:32px;font-weight:850;color:var(--blue)}.stats-panel small{font-size:11px;color:var(--muted)}.notice{border:1px solid #dbe8f5;border-radius:12px;padding:17px 20px;background:#f6faff;color:#52667b;font-size:13px}.notice strong{color:var(--ink)}.notice.below{margin-top:25px}.page-intro{max-width:760px;margin-bottom:32px}.page-intro h1,.prose h1{font-size:clamp(34px,4vw,48px)}.prose{max-width:840px}.prose p{color:#50637a;font-size:16px}.prose h2{margin-top:38px;font-size:27px}.prose a:not(.btn){color:var(--blue);text-decoration:underline}.prose .btn{margin-top:18px}footer{background:#10243c;color:#d7e2ef;padding:42px 0 0}.footer-grid{display:flex;justify-content:space-between;gap:25px}.footer-grid p{font-size:12px;color:#aabbd0}.footer-links{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start;font-size:12px}.footer-links a:hover{color:white}.foot-bottom{border-top:1px solid #2b3e54;margin-top:34px;padding-top:19px;padding-bottom:22px;font-size:11px;color:#9cafc5}.quiz-panel{max-width:790px;background:white;border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:0 14px 36px #1b4c810a}.quiz-setup h2{font-size:27px}.quiz-setup p{color:var(--muted)}.form-row{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.field{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:750}.field select{border:1px solid #cfdceb;border-radius:10px;padding:11px 35px 11px 12px;background:white;color:var(--ink)}.quiz-head{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--muted);font-size:12px;font-weight:800}.timer{color:#b45309;background:#fffbeb;padding:5px 10px;border-radius:20px}.progress-track{height:7px;background:#e8eef5;border-radius:20px;overflow:hidden;margin:18px 0 25px}.progress-fill{height:100%;background:var(--blue);transition:width .2s}.question-title{font-size:24px;letter-spacing:-.03em;margin-bottom:22px}.answer{display:flex;align-items:center;gap:14px;width:100%;text-align:left;border:1px solid #dbe5f0;border-radius:12px;padding:14px 15px;background:white;color:var(--ink);margin:10px 0;font-size:14px;font-weight:650}.answer:hover:not(:disabled){border-color:var(--blue);background:#f6faff}.answer .letter{border:1px solid #dce5ee;border-radius:8px;min-width:31px;height:31px;display:grid;place-items:center;font-size:12px;color:#73869c}.answer.selected{border-color:var(--blue);background:#edf3ff}.answer.right{border-color:#36b69a;background:#e7f9f2}.answer.wrong{border-color:#e07a83;background:#fff0f1}.feedback{padding:16px;background:#f0f8ff;border-radius:12px;margin:18px 0;font-size:13px}.feedback.good{background:#e9f8f2}.feedback.bad{background:#fff4ef}.quiz-actions{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-top:23px}.muted{color:var(--muted);font-size:12px}.score{font-size:46px;color:var(--blue);font-weight:850;line-height:1.1}.result-item{padding:13px 0;border-top:1px solid var(--line);font-size:13px}.result-item strong{display:block}.result-item p{margin:5px 0;color:var(--muted)}.loading{padding:25px;color:var(--muted)}.empty{padding:25px;border:1px dashed #cbd9e8;border-radius:12px;color:var(--muted)}@media(max-width:850px){.hero-grid{grid-template-columns:1fr;gap:40px}.hero{padding:60px 0}.hero-visual{max-width:550px}.feature-grid{grid-template-columns:repeat(2,1fr)}.split{gap:30px}}@media(max-width:600px){.container{padding-left:18px;padding-right:18px}.nav{min-height:68px}.menu{display:block}.nav nav{display:none;position:absolute;top:68px;left:0;right:0;background:white;border-bottom:1px solid var(--line);padding:16px 20px;flex-direction:column;align-items:stretch;gap:15px}.nav nav.open{display:flex}.hero{padding:48px 0}.hero h1{font-size:41px}.lead{font-size:15px}.trust{gap:10px}.section{padding-top:49px;padding-bottom:49px}.feature-grid,.split{grid-template-columns:1fr}.feature p{min-height:0}.stats-panel span{font-size:25px}.footer-grid{flex-direction:column}.footer-links{gap:15px}.quiz-panel{padding:18px}.question-title{font-size:21px}.exam-card{padding:20px}}

/* Account and full learning system */
.account-link{font-weight:700;color:#2563eb!important}.auth-section{max-width:660px}.auth-panel{padding:32px}.auth-form{display:grid;gap:17px;margin-top:24px}.auth-form label{display:grid;gap:7px;font-weight:650}.auth-form input{width:100%;border:1px solid #cbd5e1;border-radius:12px;padding:13px 15px;font:inherit;background:white;color:#152b45}.auth-form input:focus{outline:2px solid #0d9488}.auth-switch{margin-top:20px}.dashboard-actions{display:flex;justify-content:space-between;gap:12px;align-items:center;margin:20px 0}.dashboard-grid{margin:24px 0 34px}.mock-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:10px;margin:22px 0 35px}.mock-tile{border:1px solid #d8e4f0;background:white;padding:14px 8px;border-radius:12px;text-align:center;font-weight:650;text-decoration:none;color:#1d4ed8}.mock-tile:hover{background:#eff6ff;border-color:#2563eb}.history-list{display:grid;gap:8px;margin:15px 0 28px}.history-row{display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid #e2e8f0;border-radius:10px;padding:12px 15px;background:white}.history-row small{color:#64748b}.auth-form button{justify-self:start}@media(max-width:600px){.history-row{flex-wrap:wrap}.auth-panel{padding:20px}}

/* Mobile app shell: fixed bottom navigation, compact study-first layouts */
.mobile-tabs{display:none}.app-install{display:none}.app-install.show{display:flex}.app-install{position:fixed;bottom:84px;left:14px;right:14px;z-index:80;background:#fff;border:1px solid #cbd5e1;box-shadow:0 10px 40px #152b4525;border-radius:16px;padding:14px;align-items:center;justify-content:space-between;gap:12px}.app-install button{border:0;border-radius:10px;background:#2563eb;color:white;padding:11px 16px;font:inherit;font-weight:700}.app-install .dismiss{background:#eaf0f7;color:#152b45}
@media(max-width:760px){html{scroll-padding-top:80px}body{padding-bottom:calc(77px + env(safe-area-inset-bottom,0px));background:#f4f8fc}.site-header{position:sticky;top:0;z-index:45;background:#fff;box-shadow:0 1px 10px #152b4510}.site-header .nav{min-height:63px}.site-header .brand small{display:none}.site-header .menu{display:none}.nav nav{display:none!important}.mobile-tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));position:fixed;bottom:0;left:0;right:0;z-index:60;background:#fff;border-top:1px solid #dce6f0;box-shadow:0 -5px 20px #152b4512;padding:8px 4px calc(7px + env(safe-area-inset-bottom,0px));}.mobile-tabs a{display:flex;flex-direction:column;gap:3px;align-items:center;justify-content:center;text-decoration:none;color:#62738a;font-size:10px;font-weight:650;min-height:52px;border-radius:11px}.mobile-tabs a svg{width:23px;height:23px;stroke:currentColor;stroke-width:1.9;fill:none;stroke-linecap:round;stroke-linejoin:round}.mobile-tabs a.active{color:#2563eb;background:#eff6ff}.hero{padding:28px 0 22px}.hero-grid{gap:25px}.hero h1{font-size:clamp(31px,8vw,42px);line-height:1.13;letter-spacing:-1.1px}.hero .lead{font-size:15px}.hero .actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.hero .actions .btn{padding:13px 8px;font-size:12px;justify-content:center;text-align:center}.hero-visual{display:none}.trust{font-size:11px;gap:9px}.section{padding-top:29px;padding-bottom:29px}.section-heading h2,.split h2{font-size:25px}.feature-grid{gap:12px}.feature{padding:19px;border-radius:17px}.feature h3{font-size:17px}.feature p{font-size:13px}.page-intro h1{font-size:29px;line-height:1.2}.quiz-panel{border-radius:18px;padding:18px 15px}.question-title{font-size:20px;line-height:1.35}.answer{min-height:58px;padding:13px 12px;touch-action:manipulation}.quiz-actions{gap:9px}.quiz-actions .btn{min-height:47px}.mock-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.mock-tile{padding:14px 5px}.dashboard-actions{align-items:stretch;flex-direction:column}.dashboard-actions .btn{justify-content:center}.footer{padding-bottom:22px}.app-install{bottom:calc(83px + env(safe-area-inset-bottom,0px))}}
@media(display-mode:standalone){.app-install{display:none!important}}

/* V4 polished app-shell redesign; explicit size safeguards prevent oversized SVGs */
:root{--blue:#2563eb;--teal:#0d9488;--ink:#172a44;--muted:#65758a;--bg:#f5f8fd;--line:#e4ebf5}
html{overflow-x:hidden}body{overflow-x:hidden;background:#f8fafd;font-size:14px;line-height:1.58}svg{max-width:100%} .mobile-tabs svg{width:22px!important;height:22px!important;min-width:22px;min-height:22px;max-width:22px!important;max-height:22px!important;display:block;fill:none;stroke:currentColor;stroke-width:1.8}
.site-header{box-shadow:0 2px 14px rgba(21,43,69,.035)}.nav{min-height:74px}.brand{font-size:23px}.nav nav{gap:10px}.nav nav a{padding:10px 12px;border-radius:10px;font-size:13px}.nav nav a.active{background:#edf4ff}.nav nav a:hover{background:#f1f6fd}.nav-account{background:#eff6ff;color:#1d4ed8!important;border:1px solid #dbeafe}.container{max-width:1160px}.hero{padding:77px 0 78px;background:radial-gradient(circle at 84% 20%,#dff5f2 0,transparent 36%),linear-gradient(135deg,#f0f6ff,#f8fcff 56%,#effbf8)}.hero-grid{gap:58px}.hero h1{max-width:680px;font-size:clamp(40px,4.9vw,65px);letter-spacing:-.055em}.hero h1 em{color:#2563eb}.eyebrow{letter-spacing:1.3px;font-size:11px}.status-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#10b981;margin-right:6px}.lead{font-size:17px;line-height:1.7}.btn{border-radius:13px;min-height:46px}.btn.primary{box-shadow:0 6px 18px #2563eb20}.exam-card{box-shadow:0 25px 60px #23477618;border-radius:23px;transform:rotate(1deg)}.exam-card h3{letter-spacing:-.025em}.feature-grid{gap:16px}.feature{border-radius:20px;padding:25px;box-shadow:0 6px 24px #152b4507}.feature h3{font-size:19px}.feature-icon{border-radius:15px}.section{padding-top:66px;padding-bottom:66px}.section-heading{margin-bottom:30px}.page-intro{margin-bottom:27px}.page-intro h1{margin-bottom:12px}.quiz-panel{border-radius:22px;box-shadow:0 10px 38px #18375d0b}.answer{transition:border .15s,background .15s,transform .15s}.answer:hover:not(:disabled){transform:translateY(-1px)}.mock-tile{border-radius:13px}.stats-panel{background:#f0f6ff}.notice{border-radius:14px}.auth-panel{border-radius:20px}.mobile-tabs{display:none!important}.app-install{display:none!important}
@media(max-width:760px){body{padding-bottom:calc(84px + env(safe-area-inset-bottom,0px));background:#f5f8fd}.container{padding-left:17px;padding-right:17px}.site-header .nav{min-height:62px}.site-header .brand{font-size:20px}.site-header .brand-mark{width:36px;height:36px;font-size:14px;border-radius:10px}.site-header .brand small{display:none}.site-header .menu{display:none}.site-header .nav nav{display:none!important}.mobile-tabs{display:grid!important;grid-template-columns:repeat(5,minmax(0,1fr));align-items:stretch;position:fixed;left:0;right:0;bottom:0;z-index:100;background:#fff;border-top:1px solid #e1e9f3;box-shadow:0 -5px 20px #172a4410;padding:7px 5px calc(7px + env(safe-area-inset-bottom,0px))}.mobile-tabs a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:0;min-height:54px;padding:5px 1px;border-radius:11px;font-size:10px;line-height:1.2;text-align:center;color:#64748b}.mobile-tabs a.active{color:#2563eb;background:#eff6ff}.mobile-tabs a span{white-space:nowrap}.hero{padding:35px 0 31px}.hero-grid{display:block}.hero h1{font-size:clamp(32px,8.6vw,43px);line-height:1.11;margin:14px 0}.hero .lead{font-size:15px;line-height:1.6}.hero .actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:22px}.hero .actions .btn{font-size:12px;padding:11px 8px}.hero-visual{display:none}.trust{gap:8px;margin-top:20px}.trust span{display:inline-flex;background:#fff;border:1px solid #e3ebf4;border-radius:30px;padding:5px 9px;font-size:10px}.section{padding-top:34px;padding-bottom:34px}.section-heading{text-align:left}.section-heading h2{font-size:27px}.feature-grid{grid-template-columns:1fr;gap:12px}.feature{padding:20px;box-shadow:0 4px 14px #172a4407}.feature h3{margin:10px 0 5px}.feature p{margin:0 0 10px;font-size:13px;min-height:0}.split{grid-template-columns:1fr;gap:23px}.stats-panel{padding:20px 12px}.stats-panel span{font-size:26px}.quiz-panel{padding:18px 15px}.answer{min-height:61px;border-radius:14px}.quiz-actions .btn{padding:12px 13px}.question-title{font-size:21px}.mock-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.footer-grid{flex-direction:column}.footer-links{gap:13px}footer{padding-bottom:10px}}
@media(min-width:761px){.mobile-tabs{display:none!important}.app-install{display:none!important}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* V5 branding, tap targets and focused exams */
.brand{display:inline-flex;align-items:center;min-width:0}.brand-image{display:block;width:202px;height:auto;max-height:61px;object-fit:contain;object-position:left center}.nav-account{display:inline-flex!important;align-items:center;justify-content:center;min-height:44px;padding:10px 18px!important;border-radius:12px;cursor:pointer}.mobile-tabs a{cursor:pointer;touch-action:manipulation}.urgent-card{background:linear-gradient(115deg,#eaf2ff,#e7f8f4);border:1px solid #cfe6ee;border-radius:24px;padding:32px 38px;display:grid;grid-template-columns:1fr 160px;align-items:center;gap:20px}.urgent-card h2{margin:10px 0}.urgent-card p{color:#4e647a;max-width:700px}.urgent-graphic{border-radius:28px;background:white;box-shadow:0 10px 30px #12345912;display:grid;place-items:center;padding:22px}.urgent-graphic span{font-size:74px;font-weight:900;color:#0d9488;line-height:1}.urgent-graphic small{font-size:11px;letter-spacing:1px;color:#1f4565;font-weight:800}.mock-section-title{margin-top:32px}.mock-section-title h2{font-size:24px;margin:0 0 8px}.mock-section-title p{color:#617187;margin:0}.mock-grid{margin:17px 0 26px}.mock-tile{display:flex;justify-content:space-between;align-items:center;gap:5px;min-height:52px;padding:13px 12px}.mock-tile span{color:#94a3b8}.mock-tile.focused{border-color:#8dd8cb;background:#effbf7;color:#0f766e}.exam-back{margin:10px 0 18px}.exam-back a{color:#2563eb;font-weight:750}.cookie-note[hidden]{display:none!important}.cookie-note{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);width:min(690px,calc(100% - 32px));z-index:150;display:flex;align-items:center;gap:20px;justify-content:space-between;background:#0b2d6b;color:#fff;padding:17px 20px;border-radius:17px;box-shadow:0 15px 50px #07172d50}.cookie-note p{font-size:12px;margin:5px 0 0;line-height:1.5;color:#e3efff}.cookie-note a{text-decoration:underline}.cookie-note .btn{white-space:nowrap;background:#0d9488}@media(max-width:760px){.brand-image{width:150px;max-height:48px}.urgent-card{grid-template-columns:1fr;padding:22px}.urgent-graphic{display:none}.cookie-note{bottom:calc(85px + env(safe-area-inset-bottom,0px));flex-direction:column;align-items:stretch;gap:10px}.cookie-note .btn{align-self:flex-end}.mock-tile{font-size:12px;padding:12px 8px}}

.login-cta{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}.login-cta p{margin:5px 0 0}.login-cta .actions{display:flex;gap:10px;flex-wrap:wrap}.mode-choice{display:flex;gap:12px;flex-wrap:wrap;margin:16px 0}.mode-choice label{padding:14px 16px;border:1px solid #cddced;border-radius:12px;flex:1;min-width:200px;cursor:pointer}.mode-choice input{margin-right:7px}.answer{width:100%;text-align:left}.answer.right{border-color:#16a34a!important;background:#e8f8ed!important}.answer.wrong{border-color:#dc2626!important;background:#feecec!important}.quiz-panel .feedback{margin:15px 0;padding:14px;border-radius:12px;background:#e9f8ef}.quiz-panel .feedback.bad{background:#fff0ef}.result-item{padding:16px 0;border-bottom:1px solid #e2e8f0}.answer.selected{border-color:#2563eb}.quiz-actions{display:flex;gap:12px;justify-content:space-between;margin-top:20px}
/* Version 6 complete: account actions, dashboard and review */
.login-cta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px}
.login-cta>div:first-child{flex:1 1 290px}
.login-cta .actions{display:flex;gap:10px;flex-wrap:wrap}
.history-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.history-row .history-review{margin-left:auto;padding:9px 15px;font-size:.89rem}
#review-panel{margin-top:22px;scroll-margin-top:105px}
#review-panel[hidden]{display:none!important}
@media(max-width:600px){.login-cta .actions{width:100%}.login-cta .actions .btn{flex:1;text-align:center}.history-row .history-review{margin-left:0}}

/* V6.2 - lower-glare buttons, clear chapter categories and practice filters */
:root { --blue:#2c64c5; }
.hero .actions .btn.primary,
.login-cta .btn.primary,
.nav-account,
.auth-panel .btn.primary {
 background:#dceafe!important;
 border:1px solid #adcaf3!important;
 color:#163d77!important;
 box-shadow:none!important;
}
.hero .actions .btn.primary:hover,
.login-cta .btn.primary:hover,
.nav-account:hover,
.auth-panel .btn.primary:hover {
 background:#c7ddfa!important;
 border-color:#82b0ec!important;
}
.hero .actions .btn.secondary { background:#fff!important; border:1px solid #c6d9ed!important; color:#233c5f!important; }
.btn.primary:focus-visible,.btn.secondary:focus-visible,.nav-account:focus-visible,
.study-category:focus-visible,select:focus-visible,.answer:focus-visible {outline:3px solid #0d9488;outline-offset:3px}
.study-category-grid { display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:28px; }
.study-category { display:flex;align-items:center;gap:17px;background:#fff;border:1px solid #d9e4f0;border-radius:17px;padding:20px 21px;min-height:112px;box-shadow:0 4px 16px #15365509;transition:border-color .15s,background .15s; }
.study-category:hover {border-color:#9bbce9;background:#f6faff}
.category-number { display:grid;place-items:center;flex:0 0 46px;height:46px;background:#e6f2fd;border-radius:13px;color:#174779;font-weight:850;font-size:17px; }
.category-info {min-width:0;flex:1;display:flex;flex-direction:column;gap:5px}
.category-info strong {font-size:16px;line-height:1.3;color:#102744;font-weight:800}
.category-info small {color:#5b6e83;font-size:12px;line-height:1.5}
.category-count {white-space:nowrap;color:#34577d;font-size:12px;font-weight:700}
.category-arrow {color:#3578b5;font-size:21px;font-weight:700}
.practice-filters { display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0 22px; }
.practice-filters .field {font-size:13px;color:#24415e;gap:8px}
.practice-filters .field select {width:100%;height:49px;min-width:0;padding:10px 36px 10px 13px;border:1px solid #bfd1e2;color:#162d49;background:#fff;border-radius:11px;font-size:14px}
.mistake-toggle {display:flex;align-items:center;gap:12px;padding:11px 14px;border:1px solid #cbdbea;border-radius:11px;background:#f6fafe;cursor:pointer;grid-column:1 / -1}
.mistake-toggle input {flex:0 0 auto;width:19px;height:19px;accent-color:#207a70}
.mistake-toggle span {display:flex;flex-direction:column;gap:3px}
.mistake-toggle strong {font-size:13px;color:#163454}
.mistake-toggle small {font-size:12px;color:#597088;font-weight:500}
.mode-fieldset {padding:0;border:0;margin:12px 0 19px;width:100%}
.mode-fieldset legend {font-size:14px;font-weight:800;color:#163454;padding:0}
.mode-choice label {display:flex;align-items:start;gap:8px;margin:0;min-width:0;}
.mode-choice label input {margin:4px 2px 0 0;accent-color:#1863b5;flex:0 0 auto}
.mode-choice label span {display:flex;flex-direction:column;gap:5px}
.mode-choice label strong {color:#15375a;font-size:14px}
.mode-choice label small {color:#60768a;font-size:12px;font-weight:500;line-height:1.5}
.session-mode-label {display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;color:#335877;font-weight:700;background:#f1f7fd;border-radius:9px;padding:8px 10px}
.session-mode-label span {color:#0f766e;white-space:nowrap}
.question-instruction {color:#5f7187;font-size:13px;font-weight:700;margin:0 0 14px}
.form-error {background:#fff2f1;border:1px solid #f3b6b2;color:#9a2323;border-radius:9px;padding:12px 14px;margin:13px 0}
.form-error[hidden] {display:none}
@media(max-width:900px){.study-category-grid{grid-template-columns:1fr}.category-count{display:inline-block}}
@media(max-width:600px){
 .study-category {padding:15px 13px;gap:12px;min-height:94px}
 .category-number{flex-basis:39px;height:39px;font-size:14px}
 .category-info strong{font-size:14px}
 .category-info small{font-size:11px}
 .category-count{font-size:11px}
 .practice-filters{grid-template-columns:1fr;gap:12px}
 .mode-choice{flex-direction:column}
 .mode-choice label{width:100%;padding:13px;flex:auto}
 .session-mode-label{font-size:11px}
 .hero .actions .btn{white-space:normal;line-height:1.35;min-height:51px}
 .login-cta .actions .btn{padding:12px 10px}
}

/* V6.3: accessible homepage copy, topic mix and low-profile PWA install control */
.hero-tagline {color:#214e84;font-weight:800;font-size:clamp(23px,2.65vw,36px);line-height:1.25;letter-spacing:-.025em;margin:8px 0 10px}
.hero-count {font-size:clamp(14px,1.5vw,17px);color:#0b6c75;font-weight:750;margin:0 0 18px}
.hero .lead {margin-top:4px}
.mock-distribution {background:#fff;border:1px solid #d9e6f3;border-radius:18px;padding:22px 25px;margin:12px 0 31px;box-shadow:0 8px 24px #15365508}
.mix-heading {display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}
.mix-heading h2 {font-size:clamp(18px,2vw,23px);letter-spacing:-.025em;margin:0 0 5px;color:#132b48}
.mix-heading p {margin:0;color:#62748b;font-size:13px}
.mix-total {background:#edf6ff;border-radius:20px;padding:6px 13px;color:#1c5486;font-size:12px;font-weight:750;white-space:nowrap}
.mix-bar {height:16px;display:flex;overflow:hidden;border-radius:99px;gap:3px;background:#edf3f8}
.mix-bar span {flex:var(--w) 1 0;background:var(--c);min-width:0}
.mix-details summary {cursor:pointer;color:#245783;font-weight:750;padding:11px 0 5px;font-size:13px}
.mix-details summary:focus-visible {outline:3px solid #0d9488;outline-offset:3px}
.mix-details ul {padding:7px 0;margin:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 20px}
.mix-details li {display:flex;align-items:center;gap:9px;font-size:12px;color:#3c516d}
.mix-details li i {display:inline-block;flex:0 0 11px;height:11px;border-radius:3px;background:var(--c)}
.mix-details li span {flex:1;min-width:0}.mix-details li strong {white-space:nowrap;color:#193b5e}
.mix-disclaimer {margin:9px 0 0;color:#697c8f;font-size:11px;line-height:1.5}
.install-prompt[hidden],#install-footer[hidden] {display:none!important}
.install-prompt {position:fixed;right:15px;bottom:16px;z-index:90;display:flex;align-items:center;gap:5px;padding:4px;border-radius:99px;background:#fff;border:1px solid #d0e2f1;box-shadow:0 8px 29px #15365522}
.install-action {cursor:pointer;background:#dceafe;color:#153f75;border:0;border-radius:99px;padding:10px 13px;display:flex;align-items:center;gap:7px;font-family:inherit;font-weight:750;font-size:12px;line-height:1.2}
.install-action:hover {background:#c7ddfa}
.install-action svg {flex:0 0 18px;max-width:18px;max-height:18px}
.install-close {cursor:pointer;background:transparent;border:0;color:#5b728c;font-size:19px;line-height:1;width:27px;height:30px;border-radius:50%}
.install-close:hover {background:#eef4fa}
.install-action:focus-visible,.install-close:focus-visible,.install-help-close:focus-visible {outline:3px solid #0d9488;outline-offset:2px}
.install-help {border:1px solid #d0e2f1;background:#fff;border-radius:18px;box-shadow:0 20px 65px #112c4560;width:min(450px,calc(100vw - 32px));padding:28px;color:#18314e}
.install-help::backdrop {background:#10263d77}
.install-help h2 {font-size:21px;line-height:1.3;margin:0 25px 13px 0}
.install-help p {font-size:14px;color:#45627e}
.install-help-close {position:absolute;right:16px;top:11px;border:0;background:transparent;font-size:26px;color:#50708d;cursor:pointer}
@media(max-width:760px){.hero-tagline{font-size:24px}.hero-count{font-size:13px;line-height:1.5}.mock-distribution{padding:17px 14px;margin:4px 0 25px}.mix-heading{align-items:flex-start;gap:8px}.mix-total{font-size:11px}.mix-details ul{grid-template-columns:1fr}.mix-bar{height:14px}.install-prompt{bottom:calc(88px + env(safe-area-inset-bottom,0px));right:12px}}
@media(display-mode:standalone){.install-prompt{display:none!important}}

/* V6.3.2: clearer separation on Topics and accessible dark footer */
.study-category-grid + .mock-distribution { margin-top:38px; }
footer .footer-brand { background:#f6f9fe; border:1px solid #d9e6f3; border-radius:12px; padding:8px 10px; width:max-content; max-width:100%; }
footer .footer-brand .brand-image { max-width:min(230px,100%); height:auto; display:block; }
footer .footer-brand-block { min-width:0; }
footer .footer-brand-block p { line-height:1.55; }
footer .footer-contact { font-size:13px; margin:11px 0 0; color:#d5e6f6; }
footer .footer-contact a { color:#91e8dc; text-decoration:underline; text-underline-offset:3px; font-weight:750; overflow-wrap:anywhere; }
footer .footer-contact a:hover,footer .footer-contact a:focus-visible { color:#ffffff; }
footer .foot-bottom { display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; }
footer .footer-version { color:#c6d9e9; white-space:nowrap; }
@media(max-width:760px) { .study-category-grid + .mock-distribution { margin-top:32px; } }

/* V6.3.3 - Exam Mode: explicit skip, flag, and review; Study Mode remains distraction-free. */
.quiz-next-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}
.exam-question-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:17px 0 2px}
.flag-question{border:1px solid #cfddeb;border-radius:10px;background:#f7faff;color:#305373;padding:9px 13px;font-size:12px;font-weight:750;display:inline-flex;gap:8px;align-items:center}
.flag-question:hover,.flag-question:focus-visible{border-color:#8faed3;background:#ecf5ff}
.flag-question.active{border-color:#e6bb57;background:#fff5dc;color:#8f6408}
.flag-question span{font-size:17px;line-height:1}
.skipped-label{font-size:12px;color:#83670d;background:#fff7e0;border-radius:9px;padding:7px 10px}
.quiz-review-panel h2{margin-top:20px}
.review-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:22px 0}
.review-summary>div{background:#f4f8fc;border:1px solid #e1ebf5;border-radius:12px;padding:12px;text-align:center;display:flex;flex-direction:column;gap:2px}
.review-summary strong{font-size:25px;color:#173c68;line-height:1.2}
.review-summary span{font-size:12px;color:#526b82}
.review-warning,.review-ready{padding:13px 15px;border-radius:11px;font-size:13px;line-height:1.6}
.review-warning{background:#fff8e7;border:1px solid #efcd7b;color:#745014}
.review-ready{background:#eef9f5;border:1px solid #a9d9c8;color:#176d54}
.review-question-grid{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:9px;margin:21px 0 13px}
.review-question{min-height:49px;display:flex;align-items:center;justify-content:center;position:relative;border:1px solid #d2dfea;border-radius:11px;background:#fff;color:#52657c;font-weight:800;font-size:15px}
.review-question.answered{background:#e7f7f0;color:#166e55;border-color:#b3ddca}
.review-question.unanswered{background:#fff9eb;color:#916911;border-color:#e8ca7d}
.review-question.flagged{outline:2px solid #e6a838;outline-offset:-3px}
.review-question:hover{filter:brightness(.96)}
.review-question:focus-visible{outline:3px solid #1767bd;outline-offset:2px}
.review-flag{position:absolute;top:1px;right:3px;font-size:12px;color:#ad6d04}
.review-legend{display:flex;flex-wrap:wrap;gap:14px;color:#53667c;font-size:11px;margin:6px 0 18px}
.review-legend>span{display:inline-flex;align-items:center;gap:5px}
.review-dot{display:inline-block;width:11px;height:11px;border-radius:3px}
.review-dot.answered{background:#88c5ad}.review-dot.unanswered{background:#e9c76a}.review-dot.flagged{background:#e4a639}
.review-actions{align-items:stretch}
.submit-warning{margin-top:20px;padding:16px 17px;border-radius:13px;background:#fff8e7;border:1px solid #eacb81}
.submit-warning[hidden]{display:none}
.submit-warning p{margin:0 0 13px;font-size:13px;color:#6b4c18}
.submit-warning .quiz-actions{margin:0;justify-content:flex-end;flex-wrap:wrap}
@media(max-width:600px){.quiz-actions{flex-wrap:wrap;gap:10px}.quiz-next-actions{flex:1}.quiz-next-actions .btn{flex:1;white-space:nowrap;padding:11px 12px;font-size:12px}.quiz-actions>#prev{padding:11px 14px}.review-question-grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:7px}.review-question{min-height:43px}.review-actions .btn{flex:1;padding:11px}}