:root{color-scheme:light;--ink: #14202e;--muted: #627184;--line: #d8e1e8;--surface: #ffffff;--soft: #f4f7f9;--blue: #0a6ea8;--blue-dark: #074f78;--green: #13804a;--mint: #dff6ea;--gold: #a16207;--gold-soft: #fff3c4;--coral: #c2410c;--red: #b42318;--shadow: 0 18px 45px rgba(22, 42, 62, .1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#edf3f6}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.loading-screen,.auth-shell{min-height:100vh}.loading-screen{display:grid;place-items:center;color:var(--muted)}.auth-shell{display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:30px;padding:46px;align-items:center;background:linear-gradient(135deg,#eef7fb,#fff 55%,#f3f8ef)}.auth-copy h1{max-width:680px;font-size:64px;line-height:1;margin:18px 0;letter-spacing:0}.auth-copy p{max-width:600px;color:var(--muted);font-size:18px;line-height:1.6}.eyebrow{margin:0 0 8px;color:var(--blue-dark);font-size:12px;font-weight:900;letter-spacing:0;text-transform:uppercase}.brand-mark{width:52px;height:52px;border-radius:8px;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:900;box-shadow:var(--shadow)}.brand-mark.small{width:38px;height:38px;font-size:13px}.auth-grid{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.auth-grid span,.demo-pill,.reward-strip span{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);background:#ffffffd1;padding:9px 12px;border-radius:8px;color:var(--ink);font-size:13px;font-weight:800}.auth-card,.panel,.focus-card,.account-banner,.price-card,.quiz-panel,.score-panel,.hero-panel,.level-card,.path-card,.metric-grid article{background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 10px 28px #142a460f}.auth-card{padding:28px;box-shadow:var(--shadow)}.auth-card h2{margin:14px 0 22px;font-size:28px}label{display:grid;gap:7px;color:var(--muted);font-size:13px;font-weight:800;margin-bottom:14px}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:11px 12px;background:#fff;color:var(--ink)}textarea{min-height:94px;resize:vertical;line-height:1.45}.primary-btn,.secondary-btn,.text-btn{border:0;border-radius:8px;min-height:42px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:900;white-space:nowrap}.primary-btn{background:var(--blue);color:#fff}.secondary-btn{background:#e7eef3;color:var(--blue-dark)}.text-btn{background:transparent;color:var(--blue);padding-inline:0}.form-note{color:var(--muted);font-size:13px}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.side-nav{background:#102334;color:#fff;padding:22px;display:flex;flex-direction:column;gap:24px}.nav-brand{display:flex;align-items:center;gap:12px}.nav-brand span{display:block;color:#a9bdcd;font-size:12px;margin-top:2px}.side-nav nav{display:grid;gap:6px}.side-nav nav button,.logout-btn,.mobile-tabs button{border:0;display:flex;align-items:center;gap:10px;color:#d9e7f1;background:transparent;font-weight:800}.side-nav nav button,.logout-btn{width:100%;padding:12px;border-radius:8px;text-align:left}.side-nav nav button.active,.side-nav nav button:hover,.logout-btn:hover{background:#ffffff1a;color:#fff}.logout-btn{margin-top:auto}.mobile-tabs{display:none}.app-main{min-width:0;padding:24px 28px 36px}.top-bar,.page-heading,.panel-title,.session-row,.admin-row,.question-topline,.hero-actions,.path-meta,.reward-strip{display:flex;align-items:center;justify-content:space-between;gap:14px}.top-bar{margin-bottom:22px}.top-bar span{color:var(--muted);font-size:13px;font-weight:800}.top-bar strong{display:block;margin-top:3px;font-size:22px}.notice-banner{margin:0 0 18px;border:1px solid #b8dec9;border-radius:8px;background:#e7f8ee;color:#075c32;padding:12px 14px;font-weight:800}.view-stack{display:grid;gap:18px}.page-heading h1,.hero-panel h1{margin:0 0 6px;font-size:34px;line-height:1.08;letter-spacing:0}.page-heading p,.hero-panel p{margin:0;color:var(--muted);line-height:1.55}.hero-panel{padding:24px;display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;align-items:center;background:linear-gradient(135deg,#fff,#eef8f4)}.hero-actions{justify-content:flex-start;margin-top:20px;flex-wrap:wrap}.level-card{padding:18px;display:grid;grid-template-columns:88px minmax(0,1fr);gap:16px;align-items:center;background:#102334;color:#fff}.level-ring{width:78px;height:78px;border-radius:50%;border:7px solid #70d6a8;display:grid;place-items:center;text-align:center}.level-ring strong,.level-ring span{display:block;width:100%}.level-ring strong{font-size:26px;line-height:.9}.level-ring span,.level-card small{color:#b9cad6;font-size:12px;font-weight:800}.level-card>div:last-child>span{font-weight:900}.metric-grid,.panel-grid,.settings-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.split-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:14px}.feature-grid,.exam-grid,.battle-grid,.tutor-room{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.feature-grid button{border:1px solid var(--line);border-radius:8px;background:#fff;padding:18px;min-height:132px;display:grid;align-content:start;gap:8px;text-align:left;color:var(--ink);box-shadow:0 10px 28px #142a460f}.feature-grid button svg{color:var(--blue)}.feature-grid button span{color:var(--muted);line-height:1.45}.account-banner{padding:16px 18px;display:flex;justify-content:space-between;align-items:center;gap:16px;background:#fff9e6;border-color:#f2dc8c}.account-banner strong,.account-banner span{display:block}.account-banner span{margin-top:4px;color:var(--muted);line-height:1.45}.onboarding-strip{padding:16px 18px;display:flex;justify-content:space-between;align-items:center;gap:16px;border:1px solid #b8dec9;border-radius:8px;background:#e7f8ee;color:#075c32}.onboarding-strip strong,.onboarding-strip span{display:block}.onboarding-strip span{margin-top:4px;color:#2e6c4d;line-height:1.45}.practice-setup{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:14px}.setup-card{display:grid;align-content:start;gap:14px}.setup-card label{margin-bottom:0}.segment-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.segment-grid button,.recommendation-list button{border:1px solid var(--line);border-radius:8px;background:var(--soft);color:var(--ink);padding:11px 10px;font-weight:900}.segment-grid button.active{background:var(--blue);border-color:var(--blue);color:#fff}.toggle-row{grid-template-columns:18px minmax(0,1fr);align-items:center;color:var(--ink)}.toggle-row input{width:18px;height:18px}.recommendation-list{display:grid;gap:8px}.recommendation-list button{text-align:left;background:#fff}.compact-heading{padding-top:4px}.notebook-panel{display:grid;gap:14px}.notebook-actions{display:flex;flex-wrap:wrap;gap:10px}.mistake-list{display:grid;gap:10px}.mistake-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px;align-items:center;border:1px solid var(--line);border-radius:8px;background:var(--soft);padding:13px}.mistake-row span{color:var(--muted);font-size:12px;font-weight:900;text-transform:uppercase}.mistake-row strong{display:block;margin-top:5px;line-height:1.35}.mistake-row p{margin:6px 0 0;color:var(--muted);line-height:1.45}.mistake-actions{display:flex;gap:8px}.mistake-actions button{border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--blue-dark);padding:9px 10px;font-size:13px;font-weight:900}.metric-grid article,.panel,.focus-card,.quiz-panel,.score-panel,.price-card{padding:18px}.metric-grid article>svg{color:var(--blue)}.metric-grid span,.focus-card span,.score-panel span,.question-meta,.path-card span{color:var(--muted);font-size:12px;font-weight:900;text-transform:uppercase}.metric-grid strong,.score-panel strong{display:block;font-size:36px;margin:8px 0 4px}.metric-grid p,.focus-card p,.panel p,.score-panel p,.path-card p{color:var(--muted);line-height:1.55;margin-bottom:0}.panel-title{justify-content:flex-start;font-weight:900;margin-bottom:14px}.accent-panel{background:#fff9e6;border-color:#f2dc8c}.compact-path{display:grid;gap:8px}.compact-path button{width:100%;border:1px solid var(--line);border-radius:8px;background:var(--soft);display:grid;grid-template-columns:34px minmax(0,1fr) 18px;align-items:center;gap:10px;padding:12px;text-align:left;color:var(--ink)}.compact-path button>span,.path-index{width:34px;height:34px;border-radius:8px;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:900}.compact-path small{display:block;color:var(--muted);margin-top:2px}.path-list{display:grid;gap:12px}.path-card{padding:18px;display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:16px;align-items:center;background:#f9fbfc}.path-card.unlocked{background:#fff;border-color:#b8dec9}.path-card.locked{background:#f4f7f9}.path-card h2{margin:5px 0 6px;font-size:21px}.path-meta{justify-content:flex-start;flex-wrap:wrap;margin-top:12px}.path-meta strong{background:var(--soft);border-radius:8px;padding:7px 10px;font-size:12px}.lesson-list{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}.lesson-list small{border:1px solid var(--line);border-radius:8px;background:#fff;padding:7px 9px;color:var(--muted);font-weight:800}.quiz-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:16px}.side-stack{display:grid;gap:14px;align-content:start}.quiz-panel{min-height:430px;position:relative}.quiz-panel h2{font-size:25px;line-height:1.32}.passage{background:var(--soft);border-left:4px solid var(--blue);border-radius:8px;padding:12px;color:var(--muted);line-height:1.6}.difficulty{border-radius:999px;padding:6px 10px;font-size:12px;font-weight:900;text-transform:capitalize}.difficulty.easy{background:var(--mint);color:var(--green)}.difficulty.medium{background:var(--gold-soft);color:var(--gold)}.difficulty.hard{background:#fee4dd;color:var(--coral)}.choice-stack{display:grid;gap:10px;margin-top:20px}.choice-stack button{display:flex;gap:12px;align-items:flex-start;text-align:left;border:1px solid var(--line);background:var(--soft);border-radius:8px;padding:14px;color:var(--ink);line-height:1.45}.choice-stack button:hover{border-color:var(--blue);background:#eef7fb}.choice-stack button strong{min-width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:#fff;border:1px solid var(--line)}.answer-toast{position:absolute;left:18px;right:18px;bottom:18px;border-radius:8px;padding:13px 14px;display:grid;gap:4px;box-shadow:var(--shadow)}.answer-toast.correct{background:#e7f8ee;color:#075c32}.answer-toast.wrong{background:#fff1ed;color:var(--red)}.progress-track{height:8px;overflow:hidden;background:#e2e8f0;border-radius:999px;margin:14px 0}.progress-track div{height:100%;background:var(--green)}.rule-list{display:grid;gap:8px;margin-top:16px}.rule-list small{color:var(--muted);line-height:1.45}.tutor-card{background:#f8fbff}.prompt-stack{display:grid;gap:8px;margin-top:14px}.prompt-stack button{border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);padding:10px;text-align:left;font-size:13px;font-weight:800}.complete-state{display:grid;place-items:center;text-align:center;padding:54px 20px}.complete-state svg{color:var(--gold)}.reward-strip{justify-content:center;flex-wrap:wrap;margin:6px 0 18px}.recent-panel{display:grid;gap:0}.session-row{display:grid;grid-template-columns:minmax(0,1fr) 90px 130px;padding:12px 0;border-top:1px solid var(--line)}.session-row span,.session-row em{color:var(--muted);font-style:normal;font-weight:800}.exam-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.exam-card{min-height:170px;display:grid;align-content:start;gap:8px}.exam-card svg{color:var(--blue)}.exam-card h2,.prize-card h2,.profile-card h2{margin:0}.exam-card span{color:var(--blue-dark);font-size:12px;font-weight:900;text-transform:uppercase}.battle-grid{grid-template-columns:.8fr 1.2fr}.prize-card{background:#fff9e6;border-color:#f2dc8c}.prize-card svg{color:var(--gold)}.leaderboard{display:grid;gap:0}.leader-row{display:grid;grid-template-columns:58px minmax(0,1fr) 110px 74px 140px;align-items:center;gap:12px;padding:13px 0;border-top:1px solid var(--line)}.leader-row:first-child{border-top:0}.leader-row strong{color:var(--blue)}.leader-row span,.leader-row em{color:var(--muted);font-style:normal;font-weight:800}.leader-row em{border-radius:8px;background:var(--soft);padding:7px 9px;text-align:center}.tutor-room{grid-template-columns:minmax(0,1fr) 320px}.pricing-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.price-card{display:grid;align-content:start;gap:12px}.price-card.current{background:#eef8fb}.price-card.featured{background:#102334;color:#fff;border-color:#102334}.price-card span{width:fit-content;border-radius:999px;padding:7px 10px;background:var(--soft);color:var(--blue-dark);font-size:12px;font-weight:900;text-transform:uppercase}.price-card.featured span{background:#ffffff24;color:#d7eefb}.price-card h2{margin:0;font-size:24px}.price-card strong{font-size:34px}.price-card p,.price-card li{color:var(--muted);line-height:1.5}.price-card.featured p,.price-card.featured li{color:#c8d7e2}.price-card ul{margin:0;padding-left:19px}.tutor-chat{min-height:360px;display:grid;align-content:start;gap:12px}.chat-line{max-width:78%;border-radius:8px;padding:12px 13px;line-height:1.5}.chat-line.ai{background:#eef7fb;color:var(--blue-dark)}.chat-line.user{justify-self:end;background:var(--blue);color:#fff}.table-panel{overflow-x:auto}.admin-editor-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:14px}.admin-editor,.admin-import{display:grid;align-content:start;gap:14px}.admin-editor label{margin-bottom:0}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.admin-import p{margin:0;color:var(--muted);line-height:1.5}.import-preview-list{display:grid;gap:8px}.import-preview-list div{border:1px solid var(--line);border-radius:8px;background:var(--soft);padding:10px}.import-preview-list strong,.import-preview-list span{display:block}.import-preview-list strong{line-height:1.35}.import-preview-list span{margin-top:4px;color:var(--muted);font-size:12px;font-weight:900;text-transform:uppercase}.admin-row{display:grid;grid-template-columns:minmax(280px,1fr) 160px 140px 90px;min-width:760px;padding:14px 0;border-top:1px solid var(--line)}.admin-row:first-child{border-top:0}.admin-head{color:var(--muted);font-size:12px;font-weight:900;text-transform:uppercase}.profile-card{background:#eef8fb}.plan-pill{display:inline-flex;width:fit-content;margin-top:10px;border-radius:999px;background:var(--mint);color:var(--green);padding:7px 10px;font-size:12px;font-weight:900;text-transform:uppercase}.settings-form{display:grid;align-content:start}.settings-form h2{margin:0 0 16px}@media(max-width:980px){.auth-shell,.app-shell,.hero-panel,.quiz-layout,.metric-grid,.panel-grid,.settings-grid,.pricing-grid,.practice-setup,.admin-editor-grid,.split-grid,.feature-grid,.exam-grid,.battle-grid,.tutor-room{grid-template-columns:1fr}.auth-shell{padding:24px}.auth-copy h1{font-size:42px}.side-nav{display:none}.mobile-tabs{position:fixed;left:10px;right:10px;bottom:10px;z-index:20;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:4px;padding:7px;border:1px solid var(--line);border-radius:16px;background:#fffffff2;box-shadow:var(--shadow)}.mobile-tabs button{min-width:0;justify-content:center;display:grid;gap:3px;color:var(--muted);border-radius:10px;padding:8px 4px;font-size:11px}.mobile-tabs button.active{color:var(--blue);background:#e9f5fb}.app-main{padding:18px 14px 96px}.top-bar,.page-heading,.account-banner,.onboarding-strip{align-items:flex-start;flex-direction:column}.hero-panel,.quiz-panel,.score-panel,.panel,.focus-card,.metric-grid article{padding:16px}.level-card{grid-template-columns:82px minmax(0,1fr)}.page-heading h1,.hero-panel h1{font-size:29px}.metric-grid strong,.score-panel strong{font-size:32px}.path-card{grid-template-columns:40px minmax(0,1fr)}.path-card .secondary-btn{grid-column:1 / -1}.segment-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.field-grid,.mistake-row{grid-template-columns:1fr}.mistake-actions{flex-wrap:wrap}.leader-row{grid-template-columns:42px minmax(0,1fr) 68px}.leader-row span:nth-of-type(2),.leader-row em{display:none}.session-row{grid-template-columns:1fr;gap:4px}}@media(max-width:520px){.auth-copy h1{font-size:36px}.auth-card{padding:22px}.top-bar strong{font-size:20px}.hero-actions,.hero-actions .primary-btn,.hero-actions .secondary-btn{width:100%}.question-topline{align-items:flex-start;flex-direction:column}.quiz-panel h2{font-size:22px}.mobile-tabs{left:6px;right:6px;bottom:6px}}