:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--ink:#1d2433;--muted:#687383;--line:#d9e0e8;--panel:#fff;--soft:#f5f7fa;--accent:#147d64;--accent-dark:#0f5d4b;--coral:#c45242;--gold:#b37a16;--blue:#2f6eaa;--shadow:0 18px 46px #1f2b3a1f}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--ink:#edf4f8;--muted:#a8b4c2;--line:#334456;--panel:#172130;--soft:#111a25;--accent:#3fc49e;--accent-dark:#77dfc4;--coral:#ef806f;--gold:#e0b45c;--blue:#7ab2ef;--shadow:0 20px 56px #0000005c}*{box-sizing:border-box}body{min-height:100vh;color:var(--ink);background:linear-gradient(#ffffffd6,#f5f7faf0),url("data:image/svg+xml,%3Csvg width='160' height='160' viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='%23d5dde7' stroke-width='1'%3E%3Cpath d='M20 30h50M20 48h84M20 66h63M20 104h110M20 122h74M106 30h34M113 48h27M96 66h44'/%3E%3Cpath d='M14 16h132v128H14z' rx='8' fill='%23ffffff' 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h1{letter-spacing:0;margin:18px 0 12px;font-size:clamp(4.2rem,11vw,9rem);line-height:.88}.hero-copy p{color:#ffffffe0;max-width:620px;margin:0;font-size:1.18rem;line-height:1.6}.hero-actions{flex-wrap:wrap;align-items:center;gap:18px;margin-top:30px;display:flex}.hero-button{align-items:center;gap:9px;display:inline-flex}.text-link{color:#fff8e9;font-weight:800}.landing-main{padding:0 42px 54px}.landing-band,.landing-section,.landing-cta{max-width:1180px;margin:0 auto}.proof-band{z-index:4;border:1px solid var(--line);background:var(--line);box-shadow:var(--shadow);border-radius:8px;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:-46px;display:grid;position:relative;overflow:hidden}.proof-band div{background:#fffffff5;padding:24px}.proof-band strong{font-size:2rem;line-height:1;display:block}.proof-band span{color:var(--muted)}.landing-section{padding:84px 0 0}.section-heading{max-width:760px}.section-heading h2,.landing-cta h2{letter-spacing:0;margin:8px 0 0;font-size:clamp(2rem,4vw,4rem);line-height:1}.feature-grid,.plan-grid{gap:16px;margin-top:26px;display:grid}.feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.plan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.feature-card,.plan-card,.landing-scenarios article{border:1px solid var(--line);background:#fffffff0;border-radius:8px;padding:20px;box-shadow:0 10px 30px #1f2b3a14}.feature-icon{width:42px;height:42px;color:var(--accent-dark);background:#edf3f1;border-radius:8px;place-items:center;display:grid}.feature-card h3{margin:16px 0 8px;font-size:1.12rem}.feature-card p,.landing-scenarios p,.landing-cta p{color:var(--muted);line-height:1.55}.split-section{grid-template-columns:.85fr 1.15fr;align-items:start;gap:28px;display:grid}.landing-scenarios{grid-template-columns:1fr 1fr;gap:12px;display:grid}.landing-scenarios span,.plan-card span{color:var(--accent-dark);text-transform:uppercase;letter-spacing:.08em;font-size:.76rem;font-weight:800}.landing-scenarios 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.95fr;width:min(1120px,100%);min-height:680px;display:grid;overflow:hidden;box-shadow:0 32px 90px #0e182457}.auth-brand{color:#fff;background:linear-gradient(160deg,#111b26f5,#125652eb),#172131;align-content:space-between;gap:36px;padding:36px;display:grid;position:relative}.auth-brand .brand{color:#fff}.auth-brand .button-link{color:#ffffffb8;justify-self:start}.auth-copy{gap:16px;max-width:520px;display:grid}.auth-copy h1{letter-spacing:0;font-size:clamp(2.8rem,7vw,5.8rem);line-height:.96}.auth-copy p{color:#ffffffc2;max-width:480px;line-height:1.6}.auth-preview{gap:12px;display:grid}.auth-preview-card{background:#ffffff1a;border:1px solid #ffffff2e;border-radius:8px;padding:16px}.auth-preview-card.active{background:#ffffff2e}.auth-preview-card span{color:#ffffffa3;text-transform:uppercase;margin-bottom:8px;font-size:.78rem;font-weight:800;display:block}.auth-preview-card strong{margin-bottom:4px;display:block}.auth-preview-card p{color:#ffffffb3}.auth-card{align-content:center;gap:22px;padding:42px;display:grid}.auth-card h2{font-size:2.2rem}.auth-signed-in{gap:14px;display:grid}.onboarding-page{background:linear-gradient(135deg, #147d641f, #2f6eaa29), var(--soft);place-items:center;min-height:100vh;padding:32px;display:grid}.onboarding-shell{grid-template-columns:.95fr 1.05fr;align-items:stretch;gap:24px;width:min(1040px,100%);display:grid}.onboarding-copy,.onboarding-card{border:1px solid var(--line);box-shadow:var(--shadow);border-radius:8px}.onboarding-copy{color:#fff;background:linear-gradient(145deg,#1d2433f2,#147d64d1),#1d2433;align-content:center;gap:18px;padding:36px;display:grid}.onboarding-copy h1{letter-spacing:0;font-size:clamp(2.6rem,6vw,5rem);line-height:.98}.onboarding-copy p{color:#ffffffc2;line-height:1.62}.onboarding-card{background:var(--panel);align-content:center;gap:14px;padding:34px;display:grid}.onboarding-summary{border:1px solid var(--line);background:var(--soft);border-radius:8px;padding:14px}.onboarding-summary p{color:var(--muted);margin-top:6px;line-height:1.52}.shell{grid-template-columns:260px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffe0;flex-direction:column;gap:22px;padding:22px 18px;display:flex}.brand{align-items:center;gap:10px;font-size:1.08rem;font-weight:800;display:flex}.brand-mark{color:#fff;background:conic-gradient(from 210deg,#147d64,#2f6eaa,#c45242,#147d64);border-radius:8px;place-items:center;width:36px;height:36px;font-weight:900;display:grid}.nav{gap:6px;display:grid}.nav button{width:100%;height:42px;color:var(--muted);text-align:left;background:0 0;border:0;border-radius:7px;align-items:center;padding:0 10px;display:flex}.nav button.active,.nav button:hover{color:var(--accent-dark);background:#edf3f1}.metric-stack{gap:10px;margin-top:auto;display:grid}.metric{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:12px}.metric strong{font-size:1.35rem;line-height:1;display:block}.metric span,.muted{color:var(--muted)}main{padding:22px}.topbar,.composer-footer,.panel-heading,.label-row{justify-content:space-between;align-items:center;gap:16px;display:flex}.topbar{margin-bottom:18px}.title h1{letter-spacing:0;margin:0;font-size:clamp(1.55rem,2.2vw,2.2rem)}.title p{color:var(--muted);margin:5px 0 0}.profile-controls,.button-row{flex-wrap:wrap;justify-content:flex-end;gap:10px;display:flex}select,.icon-button{border:1px solid var(--line);background:var(--panel);height:40px;color:var(--ink);border-radius:7px}input{border:1px solid var(--line);background:var(--panel);width:100%;height:40px;color:var(--ink);border-radius:7px;padding:0 12px}select{padding:0 34px 0 12px}.icon-button{padding:0 12px}.workspace{grid-template-columns:minmax(0,1.12fr) minmax(320px,.88fr);align-items:start;gap:18px;display:grid}.practice,.feedback,.library,.notebook{border:1px solid var(--line);box-shadow:var(--shadow);background:#ffffffeb;border-radius:8px}.practice{overflow:hidden}.prompt-strip{border-bottom:1px solid var(--line);background:#fbfcfd;grid-template-columns:1fr auto;gap:14px;padding:18px;display:grid}.scenario-label{color:var(--accent-dark);letter-spacing:.08em;text-transform:uppercase;font-size:.78rem;font-weight:800}.prompt-text{margin:7px 0 0;font-size:1.06rem;line-height:1.45}.level-pill{color:var(--accent-dark);white-space:nowrap;background:#eff8f5;border:1px solid #bad8d0;border-radius:999px;align-self:start;padding:7px 10px;font-size:.8rem;font-weight:700}.thread{background:var(--soft);gap:12px;padding:18px;display:grid}.message{border:1px solid var(--line);background:var(--panel);border-radius:8px;max-width:82%;padding:12px 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review-progress{0%{width:34%;transform:translate(-110%)}50%{width:62%}to{width:34%;transform:translate(300%)}}@keyframes review-step{0%,to{opacity:.45}35%,65%{opacity:1}}.empty-feedback{text-align:center;border:1px dashed var(--line);background:#fbfcfd;border-radius:8px;align-content:center;justify-items:center;gap:10px;min-height:310px;padding:28px;display:grid}.empty-feedback svg{color:var(--accent-dark)}.empty-feedback p{max-width:360px}h2{margin:0;font-size:1.05rem}.feedback p{margin:8px 0 0;line-height:1.48}.score{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.score div{border:1px solid var(--line);background:#fbfcfd;border-radius:8px;padding:10px}.score strong{color:var(--accent-dark);display:block}.score span{color:var(--muted);font-size:.75rem}.correction-list{gap:10px;margin-top:10px;display:grid}.correction{border-left:4px solid var(--coral);background:#fff7f5;border-radius:0 8px 8px 0;padding:10px 12px}.correction 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1fr;align-items:center;gap:10px;font-size:.86rem;display:grid}.auth-divider:before,.auth-divider:after{content:"";background:var(--line);height:1px}.dashboard-layout{grid-template-columns:1.2fr .8fr;gap:18px;display:grid}.dashboard-hero{color:#fff;background:linear-gradient(135deg,#1d2433eb,#147d64d1),#1d2433;align-content:space-between;gap:24px;min-height:280px;display:grid}.dashboard-hero .scenario-label,.dashboard-hero p{color:#ffffffc7}.dashboard-hero h2{letter-spacing:0;max-width:720px;margin-top:10px;font-size:clamp(2rem,5vw,4.2rem);line-height:.98}.dashboard-hero p{max-width:620px;line-height:1.58}.dashboard-actions{flex-wrap:wrap;gap:10px;display:flex}.dashboard-actions .secondary{color:#fff;background:#ffffff1f;border-color:#ffffff5c}.dashboard-metrics{grid-template-columns:repeat(3,1fr)}.dashboard-copy{color:var(--muted);line-height:1.58}.scenario-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:18px;display:grid}.scenario-card{border:1px solid var(--line);background:#fbfcfd;border-radius:8px;align-content:space-between;gap:18px;min-height:250px;padding:16px;display:grid}.scenario-card h2{margin-top:8px}.scenario-card p{color:var(--muted);line-height:1.48}.card-footer{justify-content:space-between;align-items:center;gap:10px;display:flex}.segmented-wrap{flex-wrap:wrap;max-width:680px;display:flex}.segmented-wrap button{border-bottom:1px solid var(--line)}.notebook-layout,.progress-layout{grid-template-columns:1fr 1fr;gap:18px;display:grid}.wide{grid-column:1/-1}.spacious{margin-top:16px}.settings-list,.session-list,.progress-metrics{gap:10px;margin-top:14px;display:grid}.progress-metrics{grid-template-columns:repeat(3,minmax(0,1fr))}.settings-row,.session-row{border:1px solid var(--line);background:#fbfcfd;border-radius:8px;padding:12px}.settings-row{justify-content:space-between;align-items:center;gap:16px;display:flex}.settings-row span{color:var(--muted)}.settings-control{cursor:pointer}.settings-control select{min-width:210px}.toggle-switch{border:1px solid var(--line);background:var(--soft);min-width:86px;height:36px;color:var(--muted);border-radius:999px;grid-template-columns:24px 1fr;align-items:center;gap:8px;padding:4px 10px 4px 5px;font-weight:800;display:inline-grid}.toggle-switch span{background:var(--panel);border:1px solid var(--line);border-radius:999px;width:24px;height:24px;box-shadow:0 4px 12px #1f2b3a29}.toggle-switch.active{color:var(--accent-dark);background:#3fc49e2e;grid-template-columns:1fr 24px;padding:4px 5px 4px 10px}.toggle-switch.active span{grid-area:1/2}.session-row{grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:16px;display:grid}.session-button{width:100%;color:inherit;text-align:left}.session-button:hover{background:#f4faf8;border-color:#bad8d0}:root[data-theme=dark] .landing,:root[data-theme=dark] .landing-nav,:root[data-theme=dark] .sidebar,:root[data-theme=dark] .topbar,:root[data-theme=dark] .view-panel,:root[data-theme=dark] .feedback,:root[data-theme=dark] .practice,:root[data-theme=dark] .auth-card,:root[data-theme=dark] .message.user,:root[data-theme=dark] .composer,:root[data-theme=dark] textarea,:root[data-theme=dark] select,:root[data-theme=dark] input{background:var(--panel);color:var(--ink)}:root[data-theme=dark] .landing-nav,:root[data-theme=dark] .sidebar,:root[data-theme=dark] .topbar{background:#121b27e6}:root[data-theme=dark] .scenario-card,:root[data-theme=dark] .settings-row,:root[data-theme=dark] .session-row,:root[data-theme=dark] .task-card,:root[data-theme=dark] .score,:root[data-theme=dark] .revision-task,:root[data-theme=dark] .empty-message,:root[data-theme=dark] .message.ai{background:var(--soft)}:root[data-theme=dark] .landing-band,:root[data-theme=dark] .landing-section,:root[data-theme=dark] .landing-cta,:root[data-theme=dark] .feature-card,:root[data-theme=dark] .plan-card{background:var(--panel);border-color:var(--line)}:root[data-theme=dark] 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