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--tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}:root{--background:var(--ds-bg);--foreground:var(--ds-text);--card:var(--ds-surface);--card-foreground:var(--ds-text);--popover:var(--ds-surface-raised);--popover-foreground:var(--ds-text);--primary:var(--ds-brand-600);--primary-foreground:var(--ds-on-primary);--secondary:var(--ds-fill);--secondary-foreground:var(--ds-text);--muted:var(--ds-fill);--muted-foreground:var(--ds-text-2);--accent:var(--ds-fill);--accent-foreground:var(--ds-brand-text-strong);--border:var(--ds-border);--input:var(--ds-border);--ring:var(--ds-ring);--brand-navy:var(--ds-brand-600);--brand-iris:var(--ds-brand-600);--brand-lavender:var(--ds-subject-physics-fg);--brand-coral:var(--ds-warning-fg);--brand-mint:var(--ds-badge-correct);--blueprint:var(--ds-brand-600);--trace:var(--ds-brand-600);--trace-fill:var(--ds-tool-tint);--grid:color-mix(in srgb, var(--ds-text) 5%, transparent);--line:color-mix(in srgb, var(--ds-text) 12%, transparent);--status-correct:#15803d;--status-silly:var(--ds-warning-fg);--status-conceptual:var(--ds-brand-text-strong);--status-prerequisite:var(--ds-subject-physics-fg);--physics:var(--ds-subject-physics-fg);--chemistry:var(--ds-subject-chemistry-fg);--mathematics:var(--ds-subject-maths-fg);--biology:var(--ds-warning-fg);--glass-bg:color-mix(in srgb, var(--ds-surface) 72%, transparent);--glass-bg-strong:color-mix(in srgb, var(--ds-surface) 88%, transparent);--glass-border:var(--ds-border);--glass-shadow:var(--ds-shadow-card);--font-body:var(--ds-font-sans);--font-display:var(--ds-font-sans);--radius-sm:var(--ds-radius-sm);--radius-md:var(--ds-radius-md);--radius-lg:var(--ds-radius-lg);--radius-xl:var(--ds-radius-sheet);--radius-2xl:var(--ds-radius-sheet);--radius:var(--ds-radius-btn);--duration-fast:var(--ds-duration-fast);--duration-base:var(--ds-duration-base);--duration-slow:var(--ds-duration-slow);--ease-out:var(--ds-ease-out);--ease-in-out:var(--ds-ease-standard);--ease-drawer:var(--ds-ease-standard);--soft-shadow-raised:var(--ds-shadow-card);--soft-shadow-pressed:var(--ds-shadow-btn-pressed);--color-accent-hover:var(--ds-primary-hover);--color-primary-hover:var(--ds-primary-hover);--color-accent-light:color-mix(in srgb, var(--ds-brand-600) 12%, transparent);--color-primary-light:color-mix(in srgb, var(--ds-brand-600) 12%, transparent);--color-success:#15803d;--color-success-light:#15803d1f;--color-warning:var(--ds-warning-fg);--color-warning-light:color-mix(in srgb, var(--ds-warning-fg) 12%, transparent);--color-error:#b91c1c;--color-error-light:#b91c1c1a;--color-text-secondary:var(--ds-text-2);--color-text-tertiary:var(--ds-muted);--color-secondary:var(--ds-text-2);--color-on-primary:var(--ds-on-primary);--color-on-accent:var(--ds-on-primary);--color-card-core:var(--ds-surface);--sidebar-glass:color-mix(in srgb, var(--ds-surface) 82%, transparent)}.dark{--background:var(--ds-bg);--foreground:var(--ds-text);--card:var(--ds-surface);--card-foreground:var(--ds-text);--popover:var(--ds-surface-raised);--popover-foreground:var(--ds-text);--primary:var(--ds-brand-600);--primary-foreground:var(--ds-on-primary);--secondary:var(--ds-fill);--secondary-foreground:var(--ds-text);--muted:var(--ds-fill);--muted-foreground:var(--ds-text-2);--accent:var(--ds-fill);--accent-foreground:var(--ds-brand-text-strong);--border:var(--ds-border);--input:var(--ds-border);--ring:var(--ds-ring);--brand-navy:var(--ds-brand-600);--brand-iris:var(--ds-brand-600);--brand-lavender:var(--ds-subject-physics-fg);--brand-coral:var(--ds-warning-fg);--brand-mint:var(--ds-badge-correct);--blueprint:var(--ds-brand-600);--trace:var(--ds-brand-600);--trace-fill:var(--ds-tool-tint);--grid:color-mix(in srgb, var(--ds-text) 6%, transparent);--line:color-mix(in srgb, var(--ds-text) 12%, transparent);--status-correct:#4ade80;--status-silly:var(--ds-warning-fg);--status-conceptual:var(--ds-brand-text-strong);--status-prerequisite:var(--ds-subject-physics-fg);--physics:var(--ds-subject-physics-fg);--chemistry:var(--ds-subject-chemistry-fg);--mathematics:var(--ds-subject-maths-fg);--biology:var(--ds-warning-fg);--glass-bg:color-mix(in srgb, var(--ds-surface) 72%, transparent);--glass-bg-strong:color-mix(in srgb, var(--ds-surface) 88%, transparent);--glass-border:var(--ds-border);--glass-shadow:var(--ds-shadow-card);--soft-shadow-raised:var(--ds-shadow-card);--soft-shadow-pressed:var(--ds-shadow-btn-pressed);--color-accent-hover:var(--ds-primary-hover);--color-primary-hover:var(--ds-primary-hover);--color-accent-light:color-mix(in srgb, var(--ds-brand-600) 14%, transparent);--color-primary-light:color-mix(in srgb, var(--ds-brand-600) 14%, transparent);--color-success:#4ade80;--color-success-light:#4ade8024;--color-warning:var(--ds-warning-fg);--color-warning-light:color-mix(in srgb, var(--ds-warning-fg) 14%, transparent);--color-error:#fca5a5;--color-error-light:#fca5a51f;--color-text-secondary:var(--ds-text-2);--color-text-tertiary:var(--ds-muted);--color-secondary:var(--ds-text-2);--color-on-primary:var(--ds-on-primary);--color-on-accent:var(--ds-on-primary);--color-card-core:var(--ds-surface);--sidebar-glass:color-mix(in srgb, var(--ds-surface) 82%, transparent)}@media (width<=480px){.app-sidebar{width:min(86vw,300px)}.list-card{gap:12px!important;padding:14px!important}.list-card-icon{width:40px!important;height:40px!important;font-size:18px!important}.account{padding:16px 12px!important}.account-inner{padding:0 4px!important}.account-edit-row{flex-wrap:wrap!important}.account-input-narrow{max-width:100%!important}.es-panel{margin-bottom:88px!important}.es-chapter-row{padding:0 12px!important}.top-appbar{gap:6px!important;height:48px!important;padding:0 8px!important}}@media (width<=375px){.home-next{padding:18px 16px!important}.home-next-concept-name{font-size:22px!important}.home-because-row{grid-template-columns:1fr 18px!important}.progress-inner{padding:20px 16px!important}.ps-error-row{grid-template-columns:1fr 36px!important}.ps-error-track{display:none!important}.ps-activity{grid-template-columns:repeat(7,1fr)!important}}.answersheet-shell{background:var(--ds-bg);min-height:100dvh;color:var(--ds-text);font-family:var(--ds-font-sans)}.app-sidebar{display:none}@media (width>=821px){.app-sidebar{z-index:40;background:var(--ds-surface);border-right:1px solid var(--ds-border);width:88px;padding:var(--ds-space-16) var(--ds-space-8) calc(var(--ds-space-16) + env(safe-area-inset-bottom,0px));align-items:center;gap:var(--ds-space-8);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.app-frame{margin-left:88px}}.rail-logo{border-radius:var(--ds-radius-md);background:var(--ds-surface);border:1px solid var(--ds-border);cursor:pointer;flex-shrink:0;place-items:center;width:58px;height:58px;padding:0;display:grid}.rail-logo img{object-fit:contain;width:53px;height:53px;display:block}.rail-nav{gap:var(--ds-space-4);width:100%;margin-top:var(--ds-space-8);flex-direction:column;display:flex}.rail-item{border-radius:var(--ds-radius-md);min-height:64px;color:var(--ds-text-2);cursor:pointer;font-family:var(--ds-font-sans);padding:var(--ds-space-8) 2px;background:0 0;border:0;flex-direction:column;justify-content:center;align-items:center;gap:4px;text-decoration:none;display:flex}.rail-item__tile{border-radius:var(--ds-radius-md);place-items:center;width:44px;height:40px;display:grid}.rail-item__label{font-size:var(--ds-size-12);font-weight:400;line-height:1.3}.rail-item.is-active{color:var(--ds-text)}.rail-item.is-active .rail-item__tile{background:var(--ds-brand-50)}.dark .rail-item.is-active .rail-item__tile{background:var(--ds-brand-900)}.rail-item.is-active .rail-item__label{font-weight:500}.rail-spacer{flex:1}.rail-avatar{border-radius:var(--ds-radius-pill);background:var(--ds-surface-sunken);border:1px solid var(--ds-border);width:44px;height:44px;color:var(--ds-text-2);font-size:var(--ds-size-14);cursor:pointer;flex-shrink:0;place-items:center;font-weight:600;display:grid}.rail-pop-wrap{position:relative}.rail-pop{left:calc(100% + var(--ds-space-12));background:var(--ds-surface);border:1px solid var(--ds-border);border-radius:var(--ds-radius-lg);width:264px;box-shadow:var(--ds-shadow-pop);padding:var(--ds-space-8);z-index:70;position:absolute;bottom:0}.rail-pop__account{align-items:center;gap:var(--ds-space-12);padding:var(--ds-space-8);display:flex}.rail-pop__avatar{border-radius:var(--ds-radius-pill);background:var(--ds-surface-sunken);width:40px;height:40px;color:var(--ds-text-2);font-weight:600;font-size:var(--ds-size-14);flex-shrink:0;place-items:center;display:grid}.rail-pop__name{font-size:var(--ds-size-14);color:var(--ds-text);text-overflow:ellipsis;white-space:nowrap;font-weight:600;overflow:hidden}.rail-pop__stream{font-size:var(--ds-size-13);color:var(--ds-muted)}.rail-pop__row{align-items:center;gap:var(--ds-space-12);width:100%;min-height:44px;padding:var(--ds-space-8) var(--ds-space-8);color:var(--ds-text-2);font-family:var(--ds-font-sans);font-size:var(--ds-size-14);border-radius:var(--ds-radius-sm);cursor:pointer;text-align:left;background:0 0;border:0;font-weight:400;display:flex}button.rail-pop__row:hover{background:var(--ds-surface-sunken);color:var(--ds-text)}.rail-pop__sep{border:0;border-top:1px solid var(--ds-border);margin:var(--ds-space-4) 0}.rail-pop__who{flex-direction:column;min-width:0;display:flex}.trial-line{justify-content:space-between;align-items:center;gap:var(--ds-space-8);display:flex}.trial-unlock{border-radius:var(--ds-radius-pill);padding:var(--ds-space-4) var(--ds-space-12);font-family:var(--ds-font-sans);font-size:var(--ds-size-13);background:var(--ds-brand-600);color:#fff;cursor:pointer;border:0;flex-shrink:0;font-weight:600}.trial-unlock:active{transform:translateY(1px)}.rail-pop__streams{padding:0 0 var(--ds-space-4);flex-direction:column;display:flex}.rail-pop__trial{margin:var(--ds-space-4) var(--ds-space-8) var(--ds-space-8);padding:var(--ds-space-8) var(--ds-space-12);border-radius:var(--ds-radius-sm);background:var(--ds-warning-bg);border:1px solid var(--ds-warning-border);color:var(--ds-warning-fg);font-size:var(--ds-size-13)}.rail-pop__legal{gap:var(--ds-space-4);padding:var(--ds-space-8);font-size:var(--ds-size-12);color:var(--ds-muted);flex-wrap:wrap;align-items:center;display:flex}.rail-pop__legal a{color:var(--ds-muted);text-decoration:none}@media (width<=820px){.app-sidebar{z-index:60;background:var(--ds-surface);border-right:1px solid var(--ds-border);width:min(320px,84vw);box-shadow:var(--ds-shadow-pop);padding:var(--ds-space-16) var(--ds-space-16) calc(var(--ds-space-16) + env(safe-area-inset-bottom,0px));gap:var(--ds-space-8);transition:transform var(--ds-duration-base) var(--ds-ease-out);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0;overflow-y:auto;transform:translate(-102%)}.app-sidebar.sidebar-open{transform:translate(0)}.rail-nav,.rail-logo,.rail-spacer,.rail-pop-wrap{display:none}}.drawer-top{align-items:center;gap:var(--ds-space-8);display:flex}.mnav-close{border-radius:var(--ds-radius-pill);width:44px;height:44px;color:var(--ds-text-2);cursor:pointer;background:0 0;border:0;flex-shrink:0;place-items:center;display:grid}.drawer-account{align-items:center;gap:var(--ds-space-12);width:100%;padding:var(--ds-space-8);cursor:pointer;text-align:left;border-radius:var(--ds-radius-md);font-family:var(--ds-font-sans);background:0 0;border:0;display:flex}.drawer-streams{flex-direction:column;gap:2px;display:flex}.drawer-rows{flex-direction:column;display:flex}.drawer-trial{margin-top:var(--ds-space-8);padding:var(--ds-space-12);border-radius:var(--ds-radius-md);background:var(--ds-warning-bg);border:1px solid var(--ds-warning-border);color:var(--ds-warning-fg);font-size:var(--ds-size-13);line-height:1.5}.drawer-trial strong{font-weight:600}.drawer-trial-cta{margin-top:var(--ds-space-8);min-height:44px;color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;align-items:center;padding:0;font-weight:600;display:inline-flex}.drawer-legal{padding-top:var(--ds-space-16);font-size:var(--ds-size-12);color:var(--ds-muted);gap:var(--ds-space-8);flex-wrap:wrap;margin-top:auto;display:flex}.drawer-legal a{color:var(--ds-muted);text-decoration:none}@media (width>=821px){.drawer-top,.drawer-account,.drawer-streams,.drawer-rows,.drawer-trial,.drawer-legal{display:none}}.mobile-scrim{z-index:55;cursor:pointer;background:#0f172a73;border:0;position:fixed;inset:0}.mobile-tabbar{display:none}@media (width<=820px){.mobile-tabbar{z-index:40;height:64px;padding-bottom:env(safe-area-inset-bottom,0px);background:var(--ds-surface);border-top:1px solid var(--ds-border);display:flex;position:fixed;bottom:0;left:0;right:0}.app-frame.has-tabbar{padding-bottom:calc(84px + env(safe-area-inset-bottom,0px))}}.mobile-tab{min-width:0;min-height:64px;color:var(--ds-text-2);font-family:var(--ds-font-sans);cursor:pointer;background:0 0;border:0;flex-direction:column;flex:1 1 0;justify-content:center;align-items:center;gap:3px;padding:0 2px;font-size:12px;text-decoration:none;display:flex}.mobile-tab-label{white-space:nowrap;font-size:12px;font-weight:500}.mobile-tab.is-active,.mobile-tab.is-active .ds-icon{color:var(--ds-brand-text)}.mobile-tab.is-active .mobile-tab-label{font-weight:600}.immersive-shell .app-sidebar,.immersive-shell .mobile-tabbar{display:none}.immersive-shell .app-frame{margin-left:0}@media (prefers-reduced-motion:reduce){.app-sidebar{transition:none}}.sheet-scrim{z-index:60;background:var(--ds-sheet-backdrop);justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.sheet-scrim--below{top:56px}.sheet-panel{background:var(--ds-surface-raised);width:100%;max-width:560px;max-height:88dvh;padding:8px 16px calc(20px + env(safe-area-inset-bottom,0px));border-radius:20px 20px 0 0;flex-direction:column;gap:14px;animation:.22s ease-out sheet-up;display:flex;overflow-y:auto;box-shadow:0 -10px 30px -12px #0000004d}@keyframes sheet-up{0%{opacity:.6;transform:translateY(24px)}to{opacity:1;transform:none}}.sheet-grab{background:var(--ds-border-strong);border-radius:2px;flex:none;width:36px;height:4px;margin:0 auto 4px}.sheet-title{color:var(--ds-text);margin:0;font-size:18px;font-weight:600;line-height:24px}.sheet-body{flex-direction:column;gap:14px;display:flex}@media (prefers-reduced-motion:reduce){.sheet-panel{animation:none}}:root{--mnu-bg:var(--ds-bg);--mnu-glow:var(--ds-home-glow);--mnu-surface:var(--ds-surface);--mnu-fill:var(--ds-fill);--mnu-border:var(--ds-border);--mnu-bs:var(--ds-border-strong);--mnu-text:var(--ds-text);--mnu-text2:var(--ds-text-2);--mnu-bt:var(--ds-brand-600);--mnu-tint:var(--ds-tool-tint);--mnu-no:var(--ds-wrong-fg);--mnu-shadow:var(--ds-shadow-card);--mnu-bacc:#2196f373}.dark{--mnu-bt:var(--ds-brand-text);--mnu-bacc:#4da3ff80}.mnu{--mnu-bg:var(--ds-bg);--mnu-glow:var(--ds-home-glow);--mnu-surface:var(--ds-surface);--mnu-fill:var(--ds-fill);--mnu-border:var(--ds-border);--mnu-bs:var(--ds-border-strong);--mnu-text:var(--ds-text);--mnu-text2:var(--ds-text-2);--mnu-bt:var(--ds-brand-600);--mnu-tint:var(--ds-tool-tint);--mnu-no:var(--ds-wrong-fg);--mnu-shadow:var(--ds-shadow-card);--mnu-bacc:#2196f373;background:radial-gradient(520px 260px at 50% -40px, var(--mnu-glow), transparent), var(--mnu-bg);color:var(--mnu-text);font-family:var(--ds-font-sans);font-size:14px;line-height:1.4}.dark .mnu,.mnu[data-theme=dark]{--mnu-bt:var(--ds-brand-text);--mnu-bacc:#4da3ff80}.mnu--bare{flex-direction:column;min-height:100dvh;display:flex}.mnu-num{font-variant-numeric:tabular-nums}.mnu-sc{padding:12px 16px calc(12px + env(safe-area-inset-bottom,0px));flex-direction:column;flex:1;gap:16px;min-height:0;display:flex;overflow-y:auto}.mnu-sc h1{margin:0;padding-top:8px;font-size:22px;font-weight:600;line-height:28px}.mnu-me{align-items:center;gap:14px;display:flex}.mnu-av{background:var(--mnu-tint);width:56px;height:56px;color:var(--mnu-bt);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:22px;font-weight:600;display:flex}.mnu-me b{font-size:18px;line-height:24px;display:block}.mnu-me small{color:var(--mnu-text2);font-size:14px}.mnu-card{background:var(--mnu-surface);border:1px solid var(--mnu-border);box-shadow:var(--mnu-shadow);border-radius:16px;padding:16px}.mnu-tr{align-items:center;gap:12px;display:flex}.mnu-tr .mnu-m{flex:1;min-width:0}.mnu-tr b{font-size:15px;display:block}.mnu-tr small{color:var(--mnu-text2);font-size:13px}.mnu-grp{background:var(--mnu-surface);border:1px solid var(--mnu-border);box-shadow:var(--mnu-shadow);border-radius:16px}.mnu-li{border:0;border-top:1px solid var(--mnu-border);width:100%;min-height:56px;color:var(--mnu-text);text-align:left;cursor:pointer;background:0 0;align-items:center;gap:14px;padding:6px 16px;font-family:inherit;font-size:16px;text-decoration:none;display:flex}button.mnu-li{cursor:pointer}.mnu-li:first-child{border-top:0}.mnu-li .mnu-t{background:var(--mnu-tint);width:32px;height:32px;color:var(--mnu-bt);border-radius:10px;flex:none;justify-content:center;align-items:center;display:flex}.mnu-li .mnu-v{color:var(--mnu-text2);align-items:center;gap:4px;margin-left:auto;font-size:14px;display:flex}.mnu-li .mnu-chev{color:var(--mnu-text2);align-items:center;margin-left:auto;display:flex}.mnu-credits{color:var(--mnu-text2);align-self:center;align-items:center;min-height:44px;padding:0 12px;font-size:12px;text-decoration:none;display:flex}.mnu-bk{min-height:44px;color:var(--mnu-text2);cursor:pointer;background:0 0;border:0;align-self:flex-start;align-items:center;margin-left:-12px;padding:0 12px 0 8px;font-family:inherit;font-size:14px;font-weight:500;display:flex}.mnu-bk svg{transform:rotate(180deg)}.mnu-fl{flex-direction:column;gap:6px;display:flex}.mnu-hint{color:var(--mnu-text2);font-size:12px}.mnu-err{color:var(--mnu-no);align-items:center;gap:6px;margin:0;font-size:13px;display:flex}.mnu-ok{color:var(--mnu-text2);margin:0;font-size:13px}.mnu-step{align-items:center;gap:16px;display:flex}.mnu-step button{border:1px solid var(--mnu-bs);width:44px;height:44px;color:var(--mnu-text);cursor:pointer;background:0 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var(--mnu-bt);background:var(--mnu-surface);min-height:120px;color:var(--mnu-text);resize:none;border-radius:8px;width:100%;padding:12px;font-family:inherit;font-size:16px;line-height:1.4}.mnu-ta::placeholder{color:var(--mnu-text2)}.mnu-sub{color:var(--mnu-text2);margin:0;font-size:14px}.sheet-body>.mnu-sub{margin-bottom:8px}.mnu-btn{color:#fff;cursor:pointer;background:#1272ea;border:0;border-radius:12px;justify-content:center;align-items:center;width:100%;height:48px;font-family:inherit;font-size:16px;font-weight:600;display:flex}.mnu-btn:disabled{opacity:.6;cursor:default}.mnu-btn.mnu-g{color:var(--mnu-text);border:1px solid var(--mnu-bs);background:0 0}.mnu-btn.mnu-d{background:#b91c1c}.mnu-dz{min-height:48px;color:var(--mnu-no);cursor:pointer;background:0 0;border:0;align-self:flex-start;align-items:center;padding:0 4px;font-family:inherit;font-size:16px;font-weight:600;display:flex}.mnu-ul{color:var(--mnu-text);flex-direction:column;gap:6px;margin:0;padding-left:20px;font-size:14px;list-style:outside;display:flex}@media (width>=821px){.mnu--bare .mnu-sc{width:100%;max-width:560px;margin-left:auto;margin-right:auto}}@media (prefers-reduced-motion:reduce){.mnu *{transition:none!important;animation:none!important}}.ru-fab-stack{z-index:60;flex-direction:column;align-items:flex-end;gap:10px;display:flex;position:fixed;bottom:22px;right:22px}.ru-banner{border:1px solid color-mix(in srgb, var(--status-coral) 40%, transparent);border-radius:var(--radius-lg);background:var(--card);max-width:280px;box-shadow:var(--elevation-mid);cursor:pointer;color:var(--color-text-primary);text-align:left;animation:ru-banner-in .26s var(--ease-out);align-items:center;gap:10px;padding:10px 12px;display:flex}@keyframes ru-banner-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.ru-banner-icon{border-radius:var(--radius-sm);background:color-mix(in srgb, var(--status-coral) 16%, transparent);width:30px;height:30px;color:var(--status-silly);flex-shrink:0;place-items:center;font-size:15px;display:grid}.ru-banner-text{font-size:12px;line-height:1.25}.ru-banner-text strong{color:var(--color-text-primary);display:block}.ru-banner-close{width:22px;height:22px;color:var(--muted-foreground);border-radius:50%;flex-shrink:0;place-items:center;margin-left:auto;font-size:12px;display:grid}.ru-banner-close:hover{background:var(--muted);color:var(--foreground)}.ru-fab{border:1px solid color-mix(in srgb, var(--status-coral) 45%, transparent);background:linear-gradient(135deg, var(--brand-iris), var(--brand-lavender));color:#fff;width:48px;height:48px;box-shadow:var(--elevation-mid);cursor:pointer;transition:transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);border-radius:50%;place-items:center;font-size:20px;display:grid}.ru-fab:hover{box-shadow:var(--elevation-high);transform:translateY(-2px)scale(1.03)}.ru-fab:active{transform:translateY(1px)scale(.98)}.ru-scrim{z-index:70;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);animation:ru-fade .16s var(--ease-out);background:#091c2473;position:fixed;inset:0}@keyframes ru-fade{0%{opacity:0}to{opacity:1}}.ru-panel{z-index:80;border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--card);width:min(380px,100vw - 36px);max-height:calc(100dvh - 120px);box-shadow:var(--elevation-high);animation:ru-in .24s var(--ease-drawer);padding:18px;position:fixed;bottom:82px;right:18px;overflow-y:auto}@keyframes ru-in{0%{opacity:0;transform:translateY(12px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.ru-panel-head{align-items:flex-start;gap:10px;display:flex}.ru-eyebrow{letter-spacing:.14em;text-transform:uppercase;color:var(--status-silly);margin:0 0 3px;font-size:10px;font-weight:700}.ru-title{color:var(--color-text-primary);margin:0;font-family:Figtree,system-ui,-apple-system,sans-serif;font-size:1.1rem;font-weight:700;line-height:1.2}.ru-close{border:1px solid var(--border);background:var(--card);width:30px;height:30px;color:var(--muted-foreground);cursor:pointer;border-radius:50%;place-items:center;margin-left:auto;font-size:14px;display:grid}.ru-close:hover{color:var(--foreground);border-color:var(--border)}.ru-error{color:var(--color-error);background:var(--color-error-light);border-radius:var(--radius-sm);margin:12px 0 0;padding:8px 10px;font-size:12px}.ru-loading{color:var(--muted-foreground);margin:16px 0 0;font-size:13px}.ru-body{flex-direction:column;gap:14px;margin-top:14px;display:flex}.ru-share-text{color:var(--color-text-secondary);margin:0 0 10px;font-size:13px;line-height:1.5}.ru-share-text strong{color:var(--color-text-primary)}.ru-code{border:1px dashed color-mix(in srgb, var(--blueprint) 45%, transparent);border-radius:var(--radius-md);background:color-mix(in srgb, var(--blueprint) 6%, var(--card));cursor:pointer;text-align:left;width:100%;transition:transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);grid-template-columns:1fr auto;align-items:center;gap:4px 10px;padding:10px 12px;display:grid}.ru-code:hover{box-shadow:var(--elevation-low);transform:translateY(-1px)}.ru-code-label{letter-spacing:.1em;text-transform:uppercase;color:var(--muted-foreground);grid-column:1;font-size:10px;font-weight:700}.ru-code-value{color:var(--blueprint);letter-spacing:.04em;overflow-wrap:anywhere;word-break:break-all;grid-column:1;font-size:12px;font-weight:700;line-height:1.45}.ru-code .ru-copy{color:var(--muted-foreground);grid-area:1/2/span 2;margin-left:auto;font-size:15px}.ru-bare-code{border:1px solid color-mix(in srgb, var(--border) 70%, transparent);border-radius:var(--radius-md);cursor:pointer;text-align:left;background:0 0;align-items:center;gap:10px;width:100%;margin-top:8px;padding:8px 12px;display:flex}.ru-bare-code:hover{background:color-mix(in srgb, var(--blueprint) 5%, transparent)}.ru-bare-code-label{letter-spacing:.1em;text-transform:uppercase;color:var(--muted-foreground);font-size:10px;font-weight:700}.ru-bare-code-value{color:var(--color-text-primary);letter-spacing:.1em;font-size:13px;font-weight:700}.ru-bare-code .ru-copy{color:var(--muted-foreground);margin-left:auto;font-size:14px}.ru-steps{flex-direction:column;gap:8px;display:flex}.ru-step{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--card);align-items:center;gap:10px;padding:8px 10px;display:flex}.ru-step.is-done{border-color:color-mix(in srgb, var(--status-correct) 45%, transparent);background:color-mix(in srgb, var(--status-correct) 6%, var(--card))}.ru-step-num{background:var(--muted);width:22px;height:22px;color:var(--muted-foreground);border-radius:50%;flex-shrink:0;place-items:center;font-size:11px;font-weight:700;display:grid}.ru-step.is-done .ru-step-num{background:var(--status-correct);color:#fff}.ru-step-label{color:var(--color-text-primary);font-size:13px}.ru-step-count{color:var(--muted-foreground);margin-left:auto;font-size:13px;font-weight:700}.ru-lock-status{align-items:center;gap:8px;display:flex}.ru-lock-badge{border-radius:var(--radius-sm);background:var(--muted);color:var(--muted-foreground);--ds-icon-color:var(--muted-foreground);align-items:center;gap:6px;padding:6px 10px;font-size:12px;font-weight:600;display:inline-flex}.ru-lock-badge.is-unlocked{background:color-mix(in srgb, var(--status-correct) 14%, transparent);color:var(--status-correct);--ds-icon-color:var(--status-correct)}.ru-papers-title{letter-spacing:.1em;text-transform:uppercase;color:var(--muted-foreground);margin:0 0 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var(--stt-bg);color:var(--stt-text);font-family:var(--ds-font-sans);font-size:14px;line-height:1.4}.dark .stt,.stt[data-theme=dark]{--stt-bt:var(--ds-brand-text)}.stt--mock{border-radius:28px;flex-direction:column;width:390px;height:640px;display:flex;position:relative;overflow:hidden}.stt--mock-tall{height:844px}.stt--bare{flex-direction:column;min-height:100dvh;display:flex}.stt-num{font-variant-numeric:tabular-nums}.stt--mock .sheet-scrim{position:absolute}.stt--mock .sheet-panel{max-width:none}.stt-sc{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}.stt-nb{background:var(--stt-warn-bg);color:var(--stt-warn-fg);border-radius:12px;flex:none;align-items:center;gap:10px;margin:12px 16px 0;padding:10px 14px;font-weight:500;display:flex}.stt-ttl{flex:none;padding:16px 16px 0;font-size:22px;font-weight:600;line-height:28px}.stt-ct{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;min-height:0;padding:24px 32px;display:flex}.stt-ct h2{margin:8px 0 0;font-size:18px;font-weight:600;line-height:24px}.stt-ct p{color:var(--stt-text2);max-width:290px;margin:0;font-size:14px}.stt-btn{color:#fff;cursor:pointer;background:#1272ea;border:0;border-radius:12px;justify-content:center;align-items:center;height:48px;margin-top:8px;padding:0 24px;font-family:inherit;font-size:16px;font-weight:600;display:inline-flex}.stt-btn.stt-g{color:var(--stt-bt);border:1px solid var(--stt-bs);background:0 0}.sys-offline{background:var(--stt-warn-bg);color:var(--stt-warn-fg);border-radius:12px;justify-content:center;align-items:center;gap:10px;margin:12px 16px 0;padding:10px 14px;font-size:14px;font-weight:500;display:flex}.stt-tabs{background:var(--stt-surface);border-top:1px solid var(--stt-border);flex:none;height:64px;display:flex}.stt-tab{color:var(--stt-text2);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:3px;font-size:12px;display:flex}.stt-tab.stt-on{color:var(--stt-bt);font-weight:600}@media (width>=821px){.stt-tabs{display:none}.stt-sc{width:100%;max-width:520px;margin-left:auto;margin-right:auto}}@media (prefers-reduced-motion:reduce){.stt *{transition:none!important;animation:none!important}}.admin-gate{padding:var(--space-4) var(--space-2);flex:1;justify-content:center;align-items:center;display:flex}.admin-gate-inner{background:var(--color-surface);border:1px solid color-mix(in srgb, var(--color-border) 72%, transparent);border-radius:var(--radius-lg);width:100%;max-width:420px;box-shadow:var(--soft-shadow-raised);padding:var(--space-4) var(--space-3)}.admin-gate-eyebrow{letter-spacing:.18em;text-transform:uppercase;color:var(--color-accent);margin-bottom:8px;font-family:Figtree,system-ui,-apple-system,sans-serif;font-size:11px}.admin-gate-title{font-family:Figtree,system-ui,-apple-system,sans-serif;font-size:var(--text-display);letter-spacing:-.02em;color:var(--color-text-primary);font-weight:600;line-height:1.05}.admin-gate-sub{color:var(--color-text-secondary);margin-top:var(--space-1);font-size:var(--text-body)}.admin-gate-form{gap:var(--space-1);margin-top:var(--space-3);display:flex}.admin-gate-form-column{flex-direction:column}.admin-gate-form-column .admin-gate-input,.admin-gate-form-column .console-btn{width:100%}.admin-gate-input{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-background);color:var(--color-text-primary);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;flex:1;padding:12px 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0;border:none;justify-content:center;align-items:center;display:inline-flex;position:absolute;top:50%;right:6px;transform:translateY(-50%)}.admin-gate-eye:hover{color:var(--color-text-primary);background:var(--color-background-subtle)}.admin-gate-field-error{color:var(--color-error);margin-top:-6px;font-family:Figtree,system-ui,-apple-system,sans-serif;font-size:11px}.admin-route-lock{z-index:60;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-text-secondary);cursor:pointer;box-shadow:var(--soft-shadow-raised);transition:color var(--transition-fast), border-color var(--transition-fast);align-items:center;gap:6px;padding:8px 12px;font-family:Figtree,system-ui,-apple-system,sans-serif;font-size:12px;display:inline-flex;position:fixed;bottom:16px;right:16px}.admin-route-lock:hover{color:var(--color-error);border-color:var(--color-error)}.ds-btn{justify-content:center;align-items:center;gap:var(--ds-space-8);height:48px;padding:0 var(--ds-space-24);border-radius:var(--ds-radius-md);background:var(--ds-brand-600);color:var(--ds-on-primary);font-family:var(--ds-font-sans);font-weight:600;font-size:var(--ds-size-16);cursor:pointer;text-transform:none;letter-spacing:normal;transition:transform var(--ds-duration-fast) var(--ds-ease-out);border:1px solid #0000;line-height:1;display:inline-flex}.ds-btn--sm{height:44px;padding:0 var(--ds-space-16);font-size:var(--ds-size-14)}.ds-btn--secondary{color:var(--ds-text);border-color:var(--ds-border-strong);box-shadow:none;background:0 0}.ds-btn--text{color:var(--ds-brand-text);box-shadow:none;background:0 0;border-color:#0000}.ds-btn--quiet{color:var(--ds-text-2);box-shadow:none;background:0 0;border-color:#0000}.ds-btn--destructive{background:var(--ds-destructive);color:#fff;box-shadow:none}.ds-btn--icon{border-radius:var(--ds-radius-md);width:44px;height:44px;color:var(--ds-text-2);border-color:var(--ds-border-strong);box-shadow:none;font-size:var(--ds-size-14);background:0 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var(--ds-duration-spinner) linear infinite;border:2.5px solid #fff6;border-top-color:#fff;flex-shrink:0}.ds-btn--secondary .ds-btn__spinner,.ds-btn--text .ds-btn__spinner,.ds-btn--quiet .ds-btn__spinner,.ds-btn--icon .ds-btn__spinner{border-color:color-mix(in srgb, currentColor 40%, transparent);border-top-color:currentColor}@keyframes ds-spin{to{transform:rotate(360deg)}}.ds-tag{border-radius:var(--ds-radius-md);background:var(--ds-tint);height:24px;color:var(--ds-brand-text-strong);font-family:var(--ds-font-sans);font-size:var(--ds-size-12);white-space:nowrap;text-transform:none;letter-spacing:normal;align-items:center;padding:0 10px;font-weight:500;line-height:1;display:inline-flex}.ds-tag--neutral{background:var(--ds-fill);color:var(--ds-text-2)}.ds-tag--diagnosis{background:var(--ds-diagnosis-bg);color:var(--ds-diagnosis-fg)}.ds-ring{font-family:var(--ds-font-sans);flex-shrink:0;place-items:center;display:inline-grid;position:relative}.ds-ring__arc{transition:none}.ds-ring__centre{font-size:var(--ds-size-12);color:var(--ds-text);text-align:center;place-items:center;padding:0 20%;font-weight:600;line-height:1.2;display:grid;position:absolute;inset:0}.ds-empty{align-items:center;gap:var(--ds-space-8);text-align:center;padding:var(--ds-space-32) var(--ds-space-16);font-family:var(--ds-font-sans);background:var(--ds-surface);border:1px solid var(--ds-border);border-radius:var(--ds-radius-lg);text-transform:none;letter-spacing:normal;flex-direction:column;display:flex}.ds-empty__icon{border-radius:var(--ds-radius-pill);background:var(--ds-surface-sunken);width:48px;height:48px;color:var(--ds-icon-inactive);margin-bottom:var(--ds-space-8);place-items:center;display:grid}.ds-empty__title{font-size:var(--ds-size-16);color:var(--ds-text);max-width:40ch;margin:0;font-weight:600;line-height:1.4}.ds-empty__body{font-size:var(--ds-size-14);color:var(--ds-muted);max-width:48ch;margin:0;font-weight:400;line-height:1.6}.ds-empty__cta{margin-top:var(--ds-space-8)}.ds-empty__illustration{margin-bottom:var(--ds-space-8);color:var(--ds-text-2);place-items:center;display:grid}.ds-skeleton{border-radius:var(--ds-radius-sm);background:var(--ds-surface-sunken);border:1px solid var(--ds-border);min-height:14px;animation:ds-shimmer var(--ds-dur-shimmer) var(--ds-ease-standard) infinite alternate}@keyframes ds-shimmer{0%{opacity:.6}to{opacity:1}}@media (prefers-reduced-motion:reduce){.ds-skeleton{opacity:.8;animation:none}}.hm{background:radial-gradient(520px 260px at 50% -40px, var(--ds-home-glow), transparent), var(--ds-bg);color:var(--ds-text);font-family:var(--ds-font-sans);min-height:100dvh;font-size:14px;line-height:1.4}.hm-inner{flex-direction:column;gap:14px;max-width:520px;margin:0 auto;padding:12px 16px;display:flex}.hm-top{flex:none;align-items:center;gap:8px;height:44px;display:flex}.hm-mark{flex:none;width:43px;height:auto}.hm-h1{white-space:nowrap;text-overflow:ellipsis;color:var(--ds-text);flex:1;margin:0;font-size:18px;font-weight:600;overflow:hidden}.hm-streak{background:var(--ds-streak-bg);height:32px;color:var(--ds-streak-fg);border-radius:999px;align-items:center;gap:4px;padding:0 10px;font-size:14px;font-weight:600;display:inline-flex}.hm-goal{background:var(--ds-surface);border:1px solid var(--ds-border);box-shadow:var(--ds-home-shadow);border-radius:16px;align-items:center;gap:14px;padding:12px 14px;display:flex}.hm-goal-title{color:var(--ds-text);font-size:16px;font-weight:600}.hm-goal-sub{color:var(--ds-text-2);font-size:13px}.hm-hero{color:#fff;box-shadow:var(--ds-home-shadow);border-radius:20px;padding:18px 16px 16px;position:relative;overflow:hidden}.hm-hero[data-subject=physics]{--hm-h1:var(--ds-hero-physics-1);--hm-h2:var(--ds-hero-physics-2);--hm-hb:var(--ds-hero-physics-btn)}.hm-hero[data-subject=chemistry]{--hm-h1:var(--ds-hero-chemistry-1);--hm-h2:var(--ds-hero-chemistry-2);--hm-hb:var(--ds-hero-chemistry-btn)}.hm-hero[data-subject=maths]{--hm-h1:var(--ds-hero-maths-1);--hm-h2:var(--ds-hero-maths-2);--hm-hb:var(--ds-hero-maths-btn)}.hm-hero{background:radial-gradient(#ffffff24 1px, transparent 1px) 0 0 / 14px 14px, linear-gradient(135deg, var(--hm-h1), var(--hm-h2))}.hm-hero-art{width:116px;height:116px;position:absolute;top:10px;right:-8px}.hm-hero-label{opacity:.9;font-size:12px;font-weight:500}.hm-hero-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;max-width:64%;margin:4px 0 6px;font-size:22px;font-weight:600;line-height:28px;display:-webkit-box;overflow:hidden}.hm-hero-reason{opacity:.92;-webkit-line-clamp:2;-webkit-box-orient:vertical;max-width:64%;margin:0 0 14px;font-size:14px;line-height:20px;display:-webkit-box;overflow:hidden}.hm-hero-cta{margin-top:0;display:block}.hm-hero-cta .ds-btn{min-height:44px;color:var(--hm-hb);box-shadow:none;background:#fff;border-color:#0000;border-radius:12px;gap:6px;padding:0 18px;font-size:14px;font-weight:600}.hm-hero-cta .ds-btn:hover:not(:disabled){filter:none}.hm-sec-head{flex:none;justify-content:space-between;align-items:center;display:flex}.hm-row{scroll-snap-type:x mandatory;scrollbar-width:none;overscroll-behavior-x:contain;gap:10px;margin:-2px;padding:2px;scroll-padding-inline:2px;display:flex;overflow-x:auto}.hm-row::-webkit-scrollbar{display:none}.hm-row:focus-visible{outline:2px solid var(--ds-brand-600);outline-offset:2px;border-radius:16px}.hm-dots{justify-content:center;gap:6px;padding:2px 0 0;display:flex}.hm-dot{background:var(--ds-border);width:6px;height:6px;transition:background var(--ds-duration-fast) var(--ds-ease-out), width var(--ds-duration-fast) var(--ds-ease-out);border-radius:999px}.hm-dot.on{background:var(--ds-brand-600);width:14px}.hm-row .hm-card{scroll-snap-align:start;flex:0 0 46%}.hm-h3{color:var(--ds-text);margin:0;font-size:16px;font-weight:600}.hm-seeall{font-family:var(--ds-font-sans);color:var(--ds-brand-text);cursor:pointer;background:0 0;border:0;margin:-10px 0;padding:10px 0 10px 12px;font-size:14px;font-weight:500}.hm-grid2{grid-template-columns:1fr 1fr;gap:10px;display:grid}.hm-card{text-align:left;background:var(--ds-surface);border:1px solid var(--ds-border);min-width:0;box-shadow:var(--ds-home-shadow);font-family:var(--ds-font-sans);cursor:pointer;border-radius:16px;flex-direction:column;align-items:stretch;gap:10px;padding:12px;display:flex}.hm-tile{border-radius:10px;justify-content:center;align-items:center;width:36px;height:36px;display:flex}.hm-tile--physics{background:var(--ds-fix-tile-physics-bg);color:var(--ds-fix-tile-physics-fg)}.hm-tile--chemistry{background:var(--ds-fix-tile-chemistry-bg);color:var(--ds-fix-tile-chemistry-fg)}.hm-tile--maths{background:var(--ds-fix-tile-maths-bg);color:var(--ds-fix-tile-maths-fg)}.hm-tile--other{background:var(--ds-fill);color:var(--ds-text-2)}.hm-card-name{min-height:19px;color:var(--ds-text);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:14px;font-weight:600;line-height:19px;display:-webkit-box;overflow:hidden}.hm-bar{background:var(--ds-fix-track);border-radius:3px;height:6px;display:block}.hm-bar i{background:var(--ds-bar-fill);border-radius:3px;height:6px;display:block}.hm-tools{grid-template-columns:repeat(3,1fr);gap:8px;display:grid}.hm-tool{font-family:var(--ds-font-sans);text-align:center;color:var(--ds-text);cursor:pointer;background:0 0;border:0;flex-direction:column;align-items:center;gap:8px;padding:0;font-size:12px;font-weight:500;display:flex}.hm-tool-sq{background:var(--ds-tool-tint);width:52px;height:52px;color:var(--ds-brand-text);border-radius:16px;justify-content:center;align-items:center;display:flex}.hm-load{flex-direction:column;gap:14px;display:flex}