@import "https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,600;12..96,700&family=Hanken+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@500;600&display=swap";@layer components;@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){:root,:host{--shimmer-angle:20deg}*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-ordinal:initial;--tw-slashed-zero:initial;--tw-numeric-figure:initial;--tw-numeric-spacing:initial;--tw-numeric-fraction:initial;--tw-outline-style:solid;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial;--tw-animation-delay:0s;--tw-animation-direction:normal;--tw-animation-duration:initial;--tw-animation-fill-mode:none;--tw-animation-iteration-count:1;--tw-enter-blur:0;--tw-enter-opacity:1;--tw-enter-rotate:0;--tw-enter-scale:1;--tw-enter-translate-x:0;--tw-enter-translate-y:0;--tw-exit-blur:0;--tw-exit-opacity:1;--tw-exit-rotate:0;--tw-exit-scale:1;--tw-exit-translate-x:0;--tw-exit-translate-y:0;--scroll-fade-t:0px;--scroll-fade-b:0px;--scroll-fade-s:0px;--scroll-fade-e:0px;--scroll-fade-mask:initial;--shimmer-image:initial;--shimmer-text-fill:initial}}}@layer theme{:root,:host{--font-sans:"Geist Variable", sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:"Geist Variable", sans-serif;--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}*{border-color:var(--border);outline-color:var(--ring)}@supports (color:color-mix(in lab, red, red)){*{outline-color:color-mix(in oklab, var(--ring) 50%, transparent)}}body{background-color:var(--background);color:var(--foreground)}html{font-family:Geist Variable,sans-serif}}@layer utilities{.collapse{visibility:collapse}.invisible{visibility:hidden}.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.container{width:100%}@media (width>=40rem){.container{max-width:40rem}}@media (width>=48rem){.container{max-width:48rem}}@media (width>=64rem){.container{max-width:64rem}}@media (width>=80rem){.container{max-width:80rem}}@media (width>=96rem){.container{max-width:96rem}}.block{display:block}.contents{display:contents}.flex{display:flex}.hidden{display:none}.inline{display:inline}.inline-flex{display:inline-flex}.table{display:table}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.rounded{border-radius:.25rem}.border{border-style:var(--tw-border-style);border-width:1px}.ordinal{--tw-ordinal:ordinal;font-variant-numeric:var(--tw-ordinal,) var(--tw-slashed-zero,) var(--tw-numeric-figure,) var(--tw-numeric-spacing,) var(--tw-numeric-fraction,)}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.running{animation-play-state:running}}@property --tw-animation-delay{syntax:"*";inherits:false;initial-value:0s}@property --tw-animation-direction{syntax:"*";inherits:false;initial-value:normal}@property --tw-animation-duration{syntax:"*";inherits:false}@property --tw-animation-fill-mode{syntax:"*";inherits:false;initial-value:none}@property --tw-animation-iteration-count{syntax:"*";inherits:false;initial-value:1}@property --tw-enter-blur{syntax:"*";inherits:false;initial-value:0}@property --tw-enter-opacity{syntax:"*";inherits:false;initial-value:1}@property --tw-enter-rotate{syntax:"*";inherits:false;initial-value:0}@property --tw-enter-scale{syntax:"*";inherits:false;initial-value:1}@property --tw-enter-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-enter-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-exit-blur{syntax:"*";inherits:false;initial-value:0}@property --tw-exit-opacity{syntax:"*";inherits:false;initial-value:1}@property --tw-exit-rotate{syntax:"*";inherits:false;initial-value:0}@property --tw-exit-scale{syntax:"*";inherits:false;initial-value:1}@property --tw-exit-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-exit-translate-y{syntax:"*";inherits:false;initial-value:0}@property --scroll-fade-t{syntax:"<length-percentage>";inherits:false;initial-value:0}@property --scroll-fade-b{syntax:"<length-percentage>";inherits:false;initial-value:0}@property --scroll-fade-s{syntax:"<length-percentage>";inherits:false;initial-value:0}@property --scroll-fade-e{syntax:"<length-percentage>";inherits:false;initial-value:0}@property --scroll-fade-mask{syntax:"*";inherits:false}@property --shimmer-angle{syntax:"<angle>";inherits:true;initial-value:20deg}@property --shimmer-image{syntax:"*";inherits:false}@property --shimmer-text-fill{syntax:"*";inherits:false}@media (prefers-reduced-motion:reduce){.shimmer{-webkit-text-fill-color:currentColor;background-image:none;animation:none}}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-ext-wght-normal-DjL33-gN.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-wght-normal-BEAKL7Jp.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-vietnamese-wght-normal-6IgcOCM7.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-ext-wght-normal-DC-KSUi6.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-wght-normal-BgDaEnEv.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--background:oklch(100% 0 0);--foreground:oklch(20.5% .01 220);--card:oklch(100% 0 0);--card-foreground:oklch(20.5% .01 220);--popover:oklch(100% 0 0);--popover-foreground:oklch(20.5% .01 220);--primary:oklch(56% .09 226);--primary-foreground:oklch(99% 0 0);--secondary:oklch(97% .01 200);--secondary-foreground:oklch(30% .02 220);--muted:oklch(97% .01 200);--muted-foreground:oklch(55% .02 215);--accent:oklch(96% .03 175);--accent-foreground:oklch(30% .05 165);--destructive:oklch(57.7% .245 27.325);--border:oklch(92.5% .008 200);--input:oklch(92.5% .008 200);--ring:oklch(56% .09 226);--radius:.55rem;--sr-white:#fff;--sr-panel:#f5f9f9;--sr-card:#fff;--sr-blue:#0e7c9b;--sr-blue-deep:#0a5e76;--sr-blue-tint:#e1f1f5;--sr-green:#15a06a;--sr-green-deep:#0f7d52;--sr-green-tint:#e4f6ee;--sr-ink:#15201f;--sr-ink-soft:#4c5a58;--sr-ink-dim:#8a9795;--sr-line:#e3eae9;--sr-line-soft:#eef3f2;--sr-radius:10px;--sr-radius-sm:8px;--sr-display:"Bricolage Grotesque", "Geist Variable", system-ui, sans-serif;--sr-body:"Hanken Grotesk", "Geist Variable", system-ui, sans-serif;--sr-mono:"JetBrains Mono", ui-monospace, monospace}html,body{width:100%;height:100%;margin:0;overflow:hidden}.sr-page,.sr-page *{box-sizing:border-box}.sr-app{background:var(--sr-white);width:100vw;height:100dvh;min-height:100svh;color:var(--sr-ink);font-family:var(--sr-body);-webkit-font-smoothing:antialiased;line-height:1.45;display:flex;position:relative;overflow:hidden}.sr-app button,.sr-app input,.sr-app select{font-family:inherit}.sr-num{font-family:var(--sr-mono);letter-spacing:-.02em;font-weight:600}.sr-catalog{width:var(--sr-rail-w,236px);background:var(--sr-panel);border-right:1px solid var(--sr-line);flex-direction:column;flex:none;min-width:236px;max-width:30vw;display:flex;position:relative}.sr-rail-grip{z-index:5;cursor:col-resize;touch-action:none;width:7px;position:absolute;top:0;bottom:0;right:-3px}.sr-rail-grip:hover,.sr-rail-grip.dragging{background:var(--sr-blue-tint)}@media (width<=1199px){.sr-rail-grip{display:none}}.sr-cat-head{align-items:center;gap:9px;padding:14px 14px 8px;display:flex}.sr-brand-link{min-width:0;color:inherit;border-radius:8px;flex:1;align-items:center;gap:9px;margin:-3px;padding:3px;text-decoration:none;display:flex}.sr-brand-link:hover{background:var(--sr-panel)}.sr-brand-mark{background:linear-gradient(135deg, var(--sr-blue), var(--sr-green));color:#fff;border-radius:8px;flex:none;place-items:center;width:28px;height:28px;display:grid}.sr-brand-name{font-family:var(--sr-display);letter-spacing:.02em;font-size:20px;font-weight:700;line-height:1.1;display:block}.sr-brand-name b{color:var(--sr-green-deep)}.sr-brand-name-zh{letter-spacing:0;font-size:18px;font-weight:800}.sr-tagline{color:var(--sr-ink-dim);margin-top:2px;font-size:12px;font-weight:600}.sr-cat-scroll{flex:1;min-height:0;padding:6px 8px 12px;overflow:auto}.sr-cat-group{color:var(--sr-ink);letter-spacing:.08em;text-transform:uppercase;margin:12px 8px 4px;font-size:10.5px;font-weight:700}.sr-item{width:100%;color:var(--sr-ink-soft);text-align:left;cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:10px;padding:8px 10px;font-size:13.5px;font-weight:500;display:flex}.sr-item svg{opacity:.85;flex:none;width:17px;height:17px}.sr-item:hover{background:var(--sr-card);color:var(--sr-ink)}.sr-item[aria-current=true]{background:var(--sr-blue-tint);color:var(--sr-blue-deep);font-weight:600}.sr-item .sr-count{background:var(--sr-line-soft);color:var(--sr-ink-dim);border-radius:999px;flex:none;margin-left:auto;padding:1px 7px;font-size:10.5px;font-weight:700}.sr-out-subject,.sr-out-book,.sr-out-stage,.sr-out-section{margin:0}.sr-out-subject>summary,.sr-out-book>summary,.sr-out-stage>summary,.sr-out-section>summary{cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:8px;align-items:center;gap:7px;list-style:none;display:flex}.sr-out-subject>summary::-webkit-details-marker{display:none}.sr-out-book>summary::-webkit-details-marker{display:none}.sr-out-stage>summary::-webkit-details-marker{display:none}.sr-out-section>summary::-webkit-details-marker{display:none}.sr-out-subject>summary{color:var(--sr-ink);font-family:var(--sr-display);margin-top:4px;padding:8px 10px;font-size:14px;font-weight:600}.sr-out-subject>summary:hover,.sr-out-book>summary:hover,.sr-out-stage>summary:hover,.sr-out-section>summary:hover{background:var(--sr-card)}.sr-out-subject-name{flex:auto}.sr-out-book{margin-left:6px}.sr-out-book>summary{color:var(--sr-ink);padding:6px 10px;font-size:13px;font-weight:600}.sr-out-stage{margin-left:6px}.sr-out-stage>summary{color:var(--sr-ink);padding:6px 10px;font-size:12.5px;font-weight:600}.sr-out-section>summary{gap:4px;padding:0}.sr-out-section>summary .sr-out-lesson,.sr-out-stage-name{flex:auto;min-width:0}.sr-out-caret{border-left:5px solid var(--sr-ink-dim);border-top:4px solid #0000;border-bottom:4px solid #0000;flex:none;width:0;height:0;transition:transform .15s}details[open]>summary>.sr-out-caret{transform:rotate(90deg)}.sr-out-lessons{border-left:1px solid var(--sr-line-soft);margin:2px 0 6px 16px;padding:0 0 0 22px;list-style:none}.sr-out-topics{margin:1px 0 4px;padding:0 0 0 8px;list-style:none}.sr-out-topic{color:var(--sr-ink);cursor:pointer;border-radius:6px;gap:7px;padding:3px 8px;font-size:12px;line-height:1.45;text-decoration:none;display:flex}.sr-out-topic:hover{background:var(--sr-card)}.sr-out-topic.active{background:var(--sr-blue-tint);color:var(--sr-blue-deep);font-weight:600}.sr-out-topic-n{text-align:right;min-width:16px;font-family:var(--sr-mono);color:inherit;flex:none;font-size:10.5px;font-weight:600}.sr-stats{background:var(--sr-card);border:1px solid var(--sr-line);border-radius:14px;flex:none;width:232px;padding:16px 18px}.sr-stats-top{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:14px;display:flex}.sr-stats-title{font-family:var(--sr-display);color:var(--sr-ink);font-size:14.5px;font-weight:600}.sr-stats-guest{border-top:1px solid var(--sr-line-soft);color:var(--sr-ink-soft);margin:14px 0 0;padding-top:12px;font-size:12.5px;font-weight:600}.sr-stats-row{gap:14px;display:grid}.sr-stat-top{justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:6px;display:flex}.sr-stat-label{color:var(--sr-ink-soft);font-size:12.5px;font-weight:600}.sr-stat-pct{color:var(--sr-ink);font-size:15px;font-weight:700}.sr-stat-bar{background:var(--sr-line-soft);border-radius:999px;height:6px;overflow:hidden}.sr-stat-bar>span{background:var(--sr-ink-dim);border-radius:999px;height:100%;display:block}.sr-stat-bar.progress>span{background:var(--sr-blue)}.sr-stat-bar.mastery>span{background:var(--sr-green)}.sr-stat-sub{color:var(--sr-ink-dim);margin:6px 0 0;font-size:11px}.sr-deck{flex-direction:column;min-height:100%;padding:2px 2px 0;display:flex}.sr-deck-where{white-space:nowrap;overscroll-behavior-x:contain;scrollbar-width:none;color:var(--sr-ink-dim);gap:8px;font-size:11.5px;font-weight:600;display:flex;overflow-x:auto}.sr-deck-where::-webkit-scrollbar{display:none}.sr-deck-step{gap:8px;display:inline-flex}.sr-deck-title{font-family:var(--sr-display);letter-spacing:-.01em;color:var(--sr-ink);align-items:baseline;gap:12px;margin:10px 0 2px;font-size:26px;font-weight:700;line-height:1.25;display:flex}.sr-deck-n{color:var(--sr-blue);flex:none;font-size:22px}.sr-deck-id{color:var(--sr-ink-dim);margin:0;font-size:11px}.sr-deck-body{border:1px dashed var(--sr-line);background:var(--sr-panel);border-radius:14px;flex:auto;place-items:center;min-height:200px;margin:16px 0;padding:22px;display:grid}.sr-deck-actions{border-top:1px solid var(--sr-line);flex-wrap:wrap;align-items:center;gap:8px;padding-top:12px;display:flex}.sr-deck-spacer{flex:auto}.sr-deck-turn{gap:8px;display:inline-flex}.sr-deck-act{border:1px solid var(--sr-line);background:var(--sr-card);color:var(--sr-ink-soft);cursor:pointer;border-radius:999px;align-items:center;gap:6px;padding:7px 12px;font-family:inherit;font-size:12.5px;font-weight:600;text-decoration:none;display:inline-flex}.sr-deck-act:hover{border-color:var(--sr-blue);color:var(--sr-blue-deep)}.sr-deck-act.disabled{opacity:.4;cursor:default;pointer-events:none}.sr-out-lessons.sr-out-toplevel{border-left:0;margin-left:6px;padding-left:14px}.sr-out-toplevel .sr-out-lesson{padding:6px 8px;font-size:12.5px;font-weight:600}.sr-out-lesson{color:var(--sr-ink);border-radius:6px;align-items:center;gap:7px;padding:5px 8px;font-size:12px;line-height:1.35;text-decoration:none;display:flex}a.sr-out-lesson{cursor:pointer}a.sr-out-lesson.ready{font-weight:600}a.sr-out-lesson:hover{background:var(--sr-card)}a.sr-out-lesson.active{background:var(--sr-blue-tint);color:var(--sr-blue-deep);font-weight:600}.sr-out-sec{color:var(--sr-ink-dim);font-variant-numeric:tabular-nums;margin-left:6px;font-size:10.5px;font-weight:600}.sr-out-dot{background:var(--sr-green);border-radius:50%;flex:none;width:6px;height:6px}.sr-detail{background:var(--sr-white);flex-direction:column;flex:1;min-width:0;min-height:0;display:flex}.sr-d-top{border-bottom:1px solid var(--sr-line-soft);background:var(--sr-panel);align-items:center;gap:10px;padding:10px 104px 10px 18px;display:flex}.sr-navtoggle{border:1px solid var(--sr-line);background:var(--sr-card);width:34px;height:34px;color:var(--sr-ink-soft);cursor:pointer;border-radius:9px;flex:none;place-items:center;display:none}.sr-navtoggle:hover{background:var(--sr-panel);color:var(--sr-ink)}.sr-icontool{border:1px solid var(--sr-line);background:var(--sr-card);width:34px;height:34px;color:var(--sr-ink-soft);cursor:pointer;border-radius:9px;flex:none;place-items:center;display:grid}.sr-icontool:hover{background:var(--sr-panel);color:var(--sr-ink)}.sr-icontool:disabled{opacity:.55;cursor:default}.sr-spin{animation:.9s linear infinite sr-spin}@keyframes sr-spin{to{transform:rotate(360deg)}}.sr-scrim{z-index:30;background:#14201e66;border:0;display:none;position:absolute;inset:0}.sr-d-title{text-overflow:ellipsis;white-space:nowrap;min-width:0;color:var(--sr-ink);font-family:var(--sr-display);letter-spacing:-.01em;font-size:16px;font-weight:600;overflow:hidden}.sr-d-scroll{flex:1;min-height:0;padding:20px;overflow:auto}.sr-d-scroll-fill{flex-direction:column;display:flex}.sr-d-scroll-fill>*{flex:auto}.sr-eyebrow{color:var(--sr-ink-dim);letter-spacing:.08em;text-transform:uppercase;margin-bottom:7px;font-size:11px;font-weight:700}.sr-eyebrow.accent{color:var(--sr-blue-deep)}.sr-title{color:var(--sr-ink);font-family:var(--sr-display);letter-spacing:-.02em;font-size:22px;font-weight:600;line-height:1.18}.sr-sub{color:var(--sr-ink-soft);margin-top:3px;font-size:13.5px}.sr-card{border:1px solid var(--sr-line);border-radius:var(--sr-radius);background:var(--sr-card);padding:15px}.sr-section-gap{margin-top:14px}.sr-d-scroll>.sr-section-gap:first-child{margin-top:0}.sr-grid{gap:12px;display:grid}.sr-grid.two{grid-template-columns:1fr 1fr}.sr-card-title{font-family:var(--sr-display);color:var(--sr-ink);margin:0 0 4px;font-size:14.5px;font-weight:600}.sr-copy{color:var(--sr-ink-soft);font-size:13.5px;line-height:1.6}.sr-chip{background:var(--sr-blue-tint);color:var(--sr-blue-deep);border-radius:999px;align-items:center;gap:6px;padding:3px 9px;font-size:11.5px;font-weight:600;display:inline-flex}.sr-chip.green{background:var(--sr-green-tint);color:var(--sr-green-deep)}.sr-tag{border:1px solid var(--sr-line);color:var(--sr-ink-soft);border-radius:6px;align-items:center;padding:2px 7px;font-size:10.5px;font-weight:600;display:inline-flex}.sr-btn{border-radius:var(--sr-radius-sm);cursor:pointer;border:0;padding:9px 15px;font-size:13px;font-weight:600}.sr-btn.primary{background:var(--sr-blue);color:#fff}.sr-btn.primary:hover{background:var(--sr-blue-deep)}.sr-btn.ghost{border:1px solid var(--sr-line);color:var(--sr-ink);background:0 0}.sr-btn.ghost:hover{background:var(--sr-panel)}.sr-lesson-nav{border-top:1px solid var(--sr-line-soft);flex-wrap:wrap;justify-content:space-between;gap:10px;padding:14px 20px 20px;display:flex}.sr-lesson-nav .sr-btn{align-items:center;gap:6px;padding:8px 12px;text-decoration:none;display:inline-flex}.sr-lesson-nav .sr-btn:disabled{opacity:.55;cursor:default}.sr-lesson-nav .sr-btn:disabled:hover{background:0 0}.sr-empty{text-align:center;color:var(--sr-ink-dim);place-items:center;gap:10px;padding:48px 20px;display:grid}.sr-empty .sr-empty-icon{background:var(--sr-blue-tint);width:46px;height:46px;color:var(--sr-blue-deep);border-radius:12px;place-items:center;display:grid}.sr-empty h3{font-family:var(--sr-display);color:var(--sr-ink);margin:0;font-size:16px;font-weight:600}.sr-empty p{max-width:42ch;margin:0;font-size:13px}.sr-item:focus-visible,.sr-btn:focus-visible{outline:2px solid var(--sr-blue);outline-offset:1px}.sr-notfound{background:var(--sr-white);width:100vw;height:100dvh;color:var(--sr-ink-soft);font-family:var(--sr-body);place-items:center;font-size:15px;display:grid}@media (width<=1199px){.sr-catalog{z-index:40;width:80vw;max-width:none;transition:transform .26s;position:absolute;inset:0 auto 0 0;transform:translate(-100%);box-shadow:0 0 50px #141e1940}.sr-catalog.open{transform:none}.sr-scrim.show{display:block}.sr-navtoggle{display:grid}}@media (prefers-reduced-motion:reduce){.sr-app *,.sr-app :before,.sr-app :after{transition:none!important;animation:none!important}}.sr-quiz-scrim{z-index:60;background:#15201f47;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.sr-quiz-drawer{background:var(--sr-white);border:1px solid var(--sr-line);border-bottom:0;border-radius:14px 14px 0 0;flex-direction:column;width:min(560px,100%);max-height:72vh;margin:0 16px;animation:.22s ease-out sr-quiz-up;display:flex;box-shadow:0 -8px 30px #15201f24}@keyframes sr-quiz-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.sr-quiz-drawer{animation:none}}@media (width<=860px){.sr-quiz-drawer{border-radius:14px 14px 0 0;width:100%;max-height:82vh;margin:0}}.sr-quiz-head{border-bottom:1px solid var(--sr-line-soft);align-items:center;gap:10px;padding:12px 14px;display:flex}.sr-quiz-title{font-family:var(--sr-display);font-size:15px;font-weight:600}.sr-quiz-count{font-family:var(--sr-mono);color:var(--sr-ink-dim);font-size:12px}.sr-quiz-close{cursor:pointer;color:var(--sr-ink-soft);background:0 0;border:0;border-radius:6px;margin-left:auto;padding:4px;display:inline-flex}.sr-quiz-close:hover{background:var(--sr-panel)}.sr-quiz-body{padding:16px;overflow-y:auto}.sr-quiz-ptype{background:var(--sr-blue-tint);color:var(--sr-blue-deep);border-radius:6px;margin-bottom:8px;padding:1px 8px;font-size:11px;font-weight:700;display:inline-block}.sr-quiz-figure{margin:6px 0 12px}.sr-quiz-figure svg{max-width:min(340px,100%);height:auto;display:block}.sr-quiz-prompt{color:var(--sr-ink);margin-bottom:14px;font-size:15px;line-height:1.55}.sr-quiz-options{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.sr-quiz-opt{text-align:left;cursor:pointer;background:var(--sr-card);width:100%;color:var(--sr-ink);border:1px solid var(--sr-line);border-radius:var(--sr-radius-sm);align-items:center;gap:8px;padding:10px 12px;font-size:14.5px;display:flex}.sr-quiz-opt:hover:not(:disabled){border-color:var(--sr-blue);background:var(--sr-blue-tint)}.sr-quiz-opt:disabled{cursor:default}.sr-quiz-opt.correct{border-color:var(--sr-green);background:var(--sr-green-tint);color:var(--sr-green-deep);font-weight:600}.sr-quiz-opt.correct svg{color:var(--sr-green-deep);margin-left:auto}.sr-quiz-opt.wrong{border-color:var(--sr-ink-dim);background:var(--sr-panel);color:var(--sr-ink);font-weight:600}.sr-quiz-opt.wrong svg{color:var(--sr-ink-soft);margin-left:auto}.sr-quiz-opt.picking{border-color:var(--sr-blue);background:var(--sr-blue-tint)}.sr-quiz-opt.dim{opacity:.45}.sr-quiz-opt-text{flex:1}.sr-quiz-feedback{border-top:1px solid var(--sr-line-soft);margin-top:14px;padding-top:12px}.sr-quiz-verdict{border-radius:var(--sr-radius-sm);align-items:center;gap:6px;margin-bottom:12px;padding:8px 10px;font-size:14px;font-weight:600;display:flex}.sr-quiz-verdict.ok{color:var(--sr-green-deep);background:var(--sr-green-tint)}.sr-quiz-verdict.bad{color:var(--sr-ink);background:var(--sr-panel)}.sr-quiz-answer{color:var(--sr-ink-soft);border-left:2px solid var(--sr-green);padding-left:10px;font-size:14px;line-height:1.55}.sr-quiz-work{color:var(--sr-ink-soft);text-align:center;border:1px dashed var(--sr-line);border-radius:var(--sr-radius-sm);flex-direction:column;align-items:center;gap:10px;padding:22px 12px;font-size:13.5px;display:flex}.sr-quiz-input{gap:8px;margin-top:12px;display:flex}.sr-quiz-input-field{min-width:0;font-size:15px;font-family:var(--sr-mono);color:var(--sr-ink);background:var(--sr-white);border:1px solid var(--sr-line);border-radius:var(--sr-radius-sm);flex:1;padding:10px 12px}.sr-quiz-input-field:focus{outline:2px solid var(--sr-blue);outline-offset:1px;border-color:var(--sr-blue)}.sr-quiz-input-field.correct{border-color:var(--sr-green);background:var(--sr-green-tint)}.sr-quiz-input-field.wrong{border-color:var(--sr-ink-dim);background:var(--sr-panel)}.sr-quiz-login,.sr-quiz-empty{color:var(--sr-ink-soft);padding:20px 6px;font-size:14px}.sr-quiz-login p{margin-bottom:12px}.sr-quiz-foot{border-top:1px solid var(--sr-line-soft);justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;display:flex}.sr-quiz-end{flex:none}.sr-quiz-end svg,.sr-quiz-gate-actions .sr-btn svg{vertical-align:-2px;margin-right:4px}.sr-quiz-gate{padding:6px 4px 4px}.sr-quiz-gate-note{color:var(--sr-ink-soft);padding:8px 2px 2px;font-size:14px;line-height:1.6}.sr-quiz-gate-actions{gap:10px;margin-top:16px;display:flex}.sr-quiz-gate-actions .sr-btn{flex:1;justify-content:center}.sr-score{border:1px solid var(--sr-line);border-radius:var(--sr-radius);background:var(--sr-card);padding:16px}.sr-score-title{font-family:var(--sr-display);color:var(--sr-ink-soft);font-size:14px;font-weight:600}.sr-score-hero{align-items:baseline;gap:12px;margin:8px 0 12px;display:flex}.sr-score-pct{font-family:var(--sr-mono);color:var(--sr-green-deep);font-size:34px;font-weight:600;line-height:1}.sr-score-ratio{color:var(--sr-ink);font-size:15px;font-weight:600}.sr-score-lines{flex-direction:column;gap:6px;display:flex}.sr-score-line{color:var(--sr-ink-soft);border-top:1px solid var(--sr-line-soft);padding-top:8px;font-size:13.5px;line-height:1.6}.sr-score-line:first-child{border-top:0;padding-top:0}.sr-score-wrong{color:var(--sr-ink);font-weight:600}.sr-login{flex-direction:column;gap:14px;max-width:340px;margin:24px auto 0;display:flex}.sr-login-lead{color:var(--sr-ink-soft);font-size:14px}.sr-login-field{color:var(--sr-ink-soft);flex-direction:column;gap:5px;font-size:13px;display:flex}.sr-login-field input{color:var(--sr-ink);background:var(--sr-white);border:1px solid var(--sr-line);border-radius:var(--sr-radius-sm);padding:9px 11px;font-size:14px}.sr-login-field input:focus{outline:2px solid var(--sr-blue);outline-offset:1px;border-color:var(--sr-blue)}.sr-login-error{color:var(--sr-green-deep);font-size:13px}.sr-login-submit{align-self:stretch;margin-top:4px}.sr-auth{background:var(--sr-panel);width:100vw;min-height:100dvh;color:var(--sr-ink);font-family:var(--sr-body);justify-content:center;align-items:center;padding:24px;display:flex}.sr-auth-card{background:var(--sr-white);border:1px solid var(--sr-line);border-radius:var(--sr-radius);width:100%;max-width:380px;padding:26px 28px 30px;box-shadow:0 8px 30px #143c420f}.sr-auth-brand{align-items:center;gap:10px;display:flex}.sr-auth-title{font-family:var(--sr-display);margin:16px 0 2px;font-size:20px;font-weight:700}.sr-auth .sr-login{max-width:none;margin:6px 0 0}.sr-usermenu{border-top:1px solid var(--sr-line);flex:none;padding:8px;position:relative}.sr-usermenu-trigger{cursor:pointer;text-align:left;width:100%;color:var(--sr-ink);background:0 0;border:0;border-radius:8px;align-items:center;gap:9px;padding:7px 8px;display:flex}.sr-usermenu-trigger:hover,.sr-usermenu-trigger.open{background:var(--sr-panel)}.sr-avatar{background:var(--sr-blue-tint);width:28px;height:28px;color:var(--sr-blue-deep);border-radius:999px;flex:none;place-items:center;font-size:13px;font-weight:700;display:grid}.sr-usermenu-name{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:13px;font-weight:600;overflow:hidden}.sr-usermenu-caret{color:var(--sr-ink-dim);flex:none;transition:transform .15s}.sr-usermenu-trigger.open .sr-usermenu-caret{transform:rotate(180deg)}.sr-usermenu-pop{background:var(--sr-card);border:1px solid var(--sr-line);z-index:30;border-radius:10px;padding:5px;position:absolute;bottom:calc(100% - 2px);left:8px;right:8px;box-shadow:0 8px 28px #15201f24,0 1px 3px #15201f14}.sr-usermenu-label{letter-spacing:.03em;color:var(--sr-ink-dim);align-items:center;gap:6px;padding:5px 9px 3px;font-size:11px;font-weight:700;display:flex}.sr-usermenu-item{width:100%;color:var(--sr-ink-soft);cursor:pointer;text-align:left;background:0 0;border:0;border-radius:7px;justify-content:space-between;align-items:center;gap:8px;padding:7px 9px;font-size:13px;display:flex}.sr-usermenu-item>:first-child{align-items:center;gap:8px;display:inline-flex}.sr-usermenu-item:hover{background:var(--sr-panel);color:var(--sr-ink)}.sr-usermenu-item.active{color:var(--sr-blue-deep);font-weight:600}.sr-usermenu-item.active:hover{background:var(--sr-blue-tint)}.sr-usermenu-sep{background:var(--sr-line);height:1px;margin:5px 4px}.sr-quiz-err{color:var(--sr-ink);background:var(--sr-panel);border:1px solid var(--sr-line);border-radius:var(--sr-radius-sm);margin-top:12px;padding:8px 10px;font-size:13px}.sr-home-top{align-items:stretch;gap:18px;margin-bottom:18px;display:flex}.sr-hero{background:var(--sr-blue-tint);border:1px solid var(--sr-line);border-radius:14px;flex-direction:column;flex:1;min-width:0;padding:20px 26px;display:flex}.sr-hero-main{flex:1;align-items:stretch;gap:24px;display:flex}.sr-hero-copy{flex-direction:column;flex:1;justify-content:space-between;min-width:0;display:flex}.sr-hero-title{font-family:var(--sr-display);color:var(--sr-ink);margin:0 0 12px;font-size:24px;font-weight:800;line-height:1.34}.sr-hero-accent{color:var(--sr-blue)}.sr-hero-points{border-left:2px solid var(--sr-blue);margin:0;padding-left:14px;list-style:none}.sr-hero-points li{letter-spacing:.01em;color:var(--sr-ink);margin-bottom:4px;font-size:15px;font-weight:600;line-height:1.6}.sr-hero-points li:last-child{margin-bottom:0}.sr-hero-art{flex:none;align-self:center;width:180px;height:auto}@media (width<=1100px){.sr-home-top{flex-direction:column}.sr-stats{width:auto}.sr-stats-row{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:18px}}@media (width<=640px){.sr-hero{padding:18px}.sr-hero-main{flex-direction:column;align-items:flex-start;gap:14px}.sr-hero-copy{align-self:stretch;display:block}.sr-hero-title{font-size:22px}.sr-hero-art{align-self:center;width:148px}}.sr-lesson-card{color:inherit;align-items:center;gap:12px;text-decoration:none;display:flex}.sr-lesson-card:hover{border-color:var(--sr-blue)}.sr-lesson-card-ico{background:var(--sr-blue-tint);width:34px;height:34px;color:var(--sr-blue-deep);border-radius:8px;flex:none;place-items:center;display:grid}.sr-lesson-card-body{flex-direction:column;gap:1px;min-width:0;display:flex}.sr-lesson-card-body .sr-card-title{margin:0}.sr-brand-img{border-radius:10px;flex:none;width:44px;height:44px;display:block}.sr-progress{background:var(--sr-card);border:1px solid var(--sr-line);border-radius:var(--sr-radius);padding:16px}.sr-progress-top{justify-content:space-between;align-items:baseline;margin-bottom:10px;display:flex}.sr-progress-title{font-family:var(--sr-display);font-size:15px;font-weight:600}.sr-progress-pct{font-family:var(--sr-mono);color:var(--sr-green-deep);font-size:16px;font-weight:600}.sr-progress-pct span{color:var(--sr-ink-dim);font-size:12px}.sr-progress-bar{background:var(--sr-line-soft);border-radius:999px;height:8px;overflow:hidden}.sr-progress-bar>span{background:var(--sr-green);border-radius:999px;height:100%;display:block}.sr-progress-stats{grid-template-columns:repeat(2,1fr);gap:10px;margin-top:15px;display:grid}.sr-progress-stat{flex-direction:column;gap:1px;display:flex}.sr-progress-stat b{font-family:var(--sr-mono);color:var(--sr-ink);font-size:20px;font-weight:600}.sr-progress-stat span{color:var(--sr-ink-dim);font-size:11.5px}.sr-read-modes{border:1px solid var(--sr-line);border-radius:var(--sr-radius);background:var(--sr-panel);gap:4px;width:calc(100% - 40px);max-width:380px;margin:16px 20px 0;padding:4px;display:flex}.sr-read-mode{border-radius:var(--sr-radius-sm);color:var(--sr-ink-soft);cursor:pointer;font-family:var(--sr-display);white-space:nowrap;background:0 0;border:0;flex:1;padding:7px 16px;font-size:13.5px;font-weight:600;transition:background .15s,color .15s}.sr-read-mode:hover{color:var(--sr-ink)}.sr-read-mode.active{background:var(--sr-blue);color:#fff}.sr-card-reader{max-width:820px;margin:0 auto;padding:18px 20px 8px}.sr-card-head{border-bottom:1px solid var(--sr-line-soft);justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:14px;padding-bottom:12px;display:flex}.sr-card-titles{flex-direction:column;gap:2px;min-width:0;display:flex}.sr-card-lesson{font-family:var(--sr-display);letter-spacing:-.01em;color:var(--sr-ink);min-width:0;font-size:18px;font-weight:600}.sr-card-section{font-family:var(--sr-body);color:var(--sr-blue);min-width:0;font-size:15px;font-weight:700}.sr-card-section-num{font-family:var(--sr-mono);font-weight:700}.sr-card-progress{font-family:var(--sr-mono);color:var(--sr-ink-soft);flex:none;font-size:13px}.sr-card-progress b{color:var(--sr-blue-deep);font-size:15px}.sr-card-frame-wrap{border:1px solid var(--sr-line);border-radius:var(--sr-radius);background:var(--sr-card);overflow:hidden}.sr-card-frame-wrap iframe{max-width:100%}.sr-card-checks{margin-top:16px}.sr-card-checks-title{font-family:var(--sr-display);color:var(--sr-blue-deep);margin-bottom:10px;font-size:13.5px;font-weight:600}.sr-card-noread{color:var(--sr-ink-dim);padding:4px 0;font-size:14px}.sr-card-guest{color:var(--sr-ink-dim);margin-top:10px;font-size:12.5px}.sr-card-check{border:1px solid var(--sr-line);border-radius:var(--sr-radius);background:var(--sr-card);margin-bottom:12px;padding:14px}.sr-card-check.ok{border-color:var(--sr-green);background:var(--sr-green-tint)}.sr-card-check-prompt{color:var(--sr-ink);align-items:baseline;gap:8px;margin-bottom:12px;font-size:15px;line-height:1.55;display:flex}.sr-card-check-n{background:var(--sr-blue);color:#fff;width:20px;height:20px;font-family:var(--sr-mono);border-radius:999px;flex:none;place-items:center;font-size:11px;font-weight:600;display:grid;transform:translateY(2px)}.sr-card-check .sr-quiz-options{margin-top:0}.sr-card-check-verdict{border-radius:var(--sr-radius-sm);align-items:center;gap:6px;margin-top:10px;padding:8px 10px;font-size:13.5px;font-weight:600;display:flex}.sr-card-check-verdict.ok{color:var(--sr-green-deep);background:var(--sr-green-tint)}.sr-card-check-verdict.bad{color:var(--sr-ink);background:var(--sr-panel)}.sr-card-nav{border-top:1px solid var(--sr-line-soft);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-top:8px;padding:14px 0 6px;display:flex}.sr-card-nav .sr-btn{align-items:center;gap:6px;display:inline-flex}.sr-card-nav .sr-btn:disabled{opacity:.5;cursor:default}.sr-card-locked{color:var(--sr-ink-dim);text-align:right;font-size:12.5px}.sr-card-done{text-align:center;border:1px solid var(--sr-green);border-radius:var(--sr-radius);background:var(--sr-green-tint);margin-top:16px;padding:18px}.sr-card-done-badge{font-family:var(--sr-display);color:var(--sr-green-deep);align-items:center;gap:6px;font-size:16px;font-weight:700;display:inline-flex}.sr-card-done p{color:var(--sr-ink-soft);margin:6px 0 14px;font-size:14px}.sr-card-done .sr-btn{align-items:center;gap:6px;display:inline-flex}@media (width<=860px){.sr-card-reader{padding:14px 14px 8px}.sr-card-head{flex-direction:column;align-items:flex-start;gap:4px}.sr-card-nav .sr-btn{flex:1;justify-content:center}.sr-card-locked{text-align:center;flex-basis:100%}}.sr-usermenu-guest{align-items:stretch;gap:6px;display:flex}.sr-usermenu-login{background:var(--sr-blue-tint);flex:1;min-width:0;text-decoration:none}.sr-usermenu-login:hover{background:var(--sr-blue-tint);filter:brightness(.97)}.sr-usermenu-login .sr-avatar{background:var(--sr-blue);color:#fff}.sr-usermenu-login .sr-usermenu-name{white-space:normal;color:var(--sr-blue-deep);line-height:1.2}.sr-usermenu-login .sr-usermenu-name small{color:var(--sr-ink-soft);font-size:11px;font-weight:500;display:block}.sr-usermenu-langbtn{border:1px solid var(--sr-line);width:40px;color:var(--sr-ink-soft);cursor:pointer;background:0 0;border-radius:8px;flex:none;place-items:center;display:grid}.sr-usermenu-langbtn:hover{background:var(--sr-panel)}.sr-hero-free{color:var(--sr-ink-soft);margin-top:10px;font-size:13.5px;font-weight:600}.sr-textbtn{color:var(--sr-blue-deep);text-underline-offset:2px;cursor:pointer;font-weight:600;text-decoration:underline}.sr-textbtn:hover{color:var(--sr-blue)}.sr-login-free{background:var(--sr-green-tint);color:var(--sr-green-deep);border-radius:999px;align-self:center;margin:-2px 0 6px;padding:3px 10px;font-size:12.5px;font-weight:600}.sr-progress-guest{color:var(--sr-ink-soft);margin-top:8px;font-size:13px}.sr-modal-scrim{z-index:60;background:#15201f70;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.sr-modal{background:var(--sr-card);border:1px solid var(--sr-line);border-radius:var(--sr-radius);width:100%;max-width:380px;padding:22px 22px 18px;box-shadow:0 12px 40px #0a5e762e}.sr-practice-gate-free{background:var(--sr-green-tint);color:var(--sr-green-deep);border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700;display:inline-block}.sr-modal-title{color:var(--sr-ink);margin:12px 0 6px;font-size:18px;font-weight:700}.sr-modal-body{color:var(--sr-ink-soft);margin:0 0 16px;font-size:14px;line-height:1.6}.sr-modal-actions{justify-content:flex-end;gap:10px;display:flex}.sr-modal-actions .sr-btn{text-decoration:none}.sr-en-head{margin-bottom:14px}.sr-en-seq{color:var(--sr-blue-deep);font-variant-numeric:tabular-nums}.sr-en-head h1{font-family:var(--sr-display);letter-spacing:-.01em;color:var(--sr-ink);margin:0;font-size:18px;font-weight:600}.sr-en-toolbar{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:12px;display:flex}.sr-en-allgloss{color:var(--sr-ink-soft);align-items:center;gap:6px;padding:7px 12px;display:inline-flex}.sr-en-allgloss:hover{background:var(--sr-panel)}.sr-en-card{background:var(--sr-card);border:1px solid var(--sr-line);border-radius:var(--sr-radius);padding:2px 15px}.sr-en-row{border-top:1px solid var(--sr-line-soft);padding:12px 0}.sr-en-row:first-child{border-top:0}.sr-en-line{align-items:flex-start;gap:10px;display:flex}.sr-en-num{background:var(--sr-line-soft);width:20px;height:20px;color:var(--sr-ink-dim);font-family:var(--sr-mono);border-radius:999px;flex:none;place-items:center;font-size:11px;display:grid}.sr-en-en{min-width:0;color:var(--sr-ink);cursor:pointer;flex:1;margin:0;font-size:15px;line-height:1.6}.sr-en-actions{flex:none;align-items:center;gap:2px;margin-left:auto;display:flex}.sr-en-zh{border-left:2px solid var(--sr-blue-tint);color:var(--sr-ink-soft);margin:6px 0 0 30px;padding-left:10px;font-size:13px;line-height:1.6}.sr-en-icon{border-radius:var(--sr-radius-sm);width:28px;height:28px;color:var(--sr-ink-dim);cursor:pointer;background:0 0;border:0;place-items:center;padding:0;display:inline-grid}.sr-en-icon:hover:not(:disabled){background:var(--sr-panel);color:var(--sr-blue)}.sr-en-icon.on{color:var(--sr-blue-deep)}.sr-en-icon:disabled{opacity:.4;cursor:default}.sr-en-vocab{background:var(--sr-card);border:1px solid var(--sr-line);border-radius:var(--sr-radius);margin-top:14px;padding:15px}.sr-en-vocab-group{margin-top:12px}.sr-en-vocab-group:first-of-type{margin-top:0}.sr-en-vocab-label{letter-spacing:.04em;border-radius:999px;margin-bottom:8px;padding:2px 9px;font-size:11px;font-weight:700;display:inline-block}.sr-en-vocab-label.new{background:var(--sr-blue-tint);color:var(--sr-blue-deep)}.sr-en-vocab-label.review{background:var(--sr-line-soft);color:var(--sr-ink-dim)}.sr-en-vocab-title{font-family:var(--sr-display);letter-spacing:.02em;color:var(--sr-ink);margin:0 0 10px;font-size:13px;font-weight:700}.sr-en-vocab-list{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:2px 18px;margin:0;padding:0;list-style:none;display:grid}.sr-en-vocab-item{border-bottom:1px solid var(--sr-line-soft);align-items:center;gap:8px;padding:4px 0;display:flex}.sr-en-vocab-item .sr-en-vocab-zh{margin-left:auto}.sr-en-word-say{width:22px;height:22px}.sr-en-vocab-en{color:var(--sr-blue-deep);font-size:14px;font-weight:600}.sr-en-vocab-zh{color:var(--sr-ink-soft);text-align:right;font-size:13px}.sr-en-patterns{background:var(--sr-panel);border:1px solid var(--sr-line);border-radius:var(--sr-radius);margin-bottom:14px;padding:15px}.sr-en-pattern-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.sr-en-pattern{border-left:2px solid var(--sr-blue);padding-left:10px}.sr-en-pattern-en{color:var(--sr-ink);margin:0;font-size:15px;font-weight:600;line-height:1.55}.sr-en-pattern-zh{color:var(--sr-ink-soft);margin:2px 0 0;font-size:12.5px;line-height:1.5}.sr-en-slot{background:var(--sr-blue-tint);color:var(--sr-blue-deep);font-family:var(--sr-mono);border-radius:3px;padding:0 3px;font-weight:700}.sr-en-speaker{color:var(--sr-green-deep);margin-right:6px;font-size:13px;font-weight:700}.sr-en-ladder-bar{flex-wrap:wrap;gap:6px;margin-bottom:12px;display:flex}.sr-en-rung{border:1px solid var(--sr-line);background:var(--sr-card);color:var(--sr-ink-soft);cursor:pointer;border-radius:999px;align-items:center;gap:5px;padding:6px 12px;font-size:12.5px;font-weight:600;display:inline-flex}.sr-en-rung:hover{background:var(--sr-panel)}.sr-en-rung.active{background:var(--sr-blue-tint);border-color:var(--sr-blue);color:var(--sr-blue-deep)}.sr-en-rung.passed{border-color:var(--sr-green);color:var(--sr-green-deep)}.sr-en-blank{border:0;border-bottom:2px solid var(--sr-blue);background:var(--sr-blue-tint);width:5.5em;max-width:100%;color:var(--sr-ink);font-family:inherit;font-size:inherit;border-radius:3px 3px 0 0;margin:0 2px;padding:1px 6px}@media (width<=640px){.sr-en-blank{width:4.2em;padding:0 4px}}.sr-en-blank:focus{outline:2px solid var(--sr-blue);outline-offset:1px}.sr-en-blank.bad{background:#fbe9e7;border-bottom-color:#b4342b}.sr-en-row.done .sr-en-en{color:var(--sr-ink-dim)}.sr-en-row.done .sr-en-num{background:var(--sr-green-tint);color:var(--sr-green)}.sr-en-row.done .sr-en-blank{border-bottom-color:var(--sr-green);background:var(--sr-green-tint)}.sr-en-badnote{color:#b4342b;margin:6px 0 0 30px;font-size:12.5px}.sr-en-assisted{color:var(--sr-ink-dim);margin:6px 0 0 30px;font-size:12.5px}.sr-en-fulltext{border:1px solid var(--sr-line);border-radius:var(--sr-radius-sm);background:var(--sr-card);width:100%;color:var(--sr-ink);resize:vertical;margin-top:10px;padding:12px;font-family:inherit;font-size:15px;line-height:1.7}.sr-en-fulltext:focus{outline:2px solid var(--sr-blue);outline-offset:1px}.sr-langmenu{z-index:20;align-items:center;height:43px;padding-right:14px;display:flex;position:absolute;top:0;right:0}.sr-langmenu-btn{color:var(--sr-ink-soft);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:8px;align-items:center;gap:6px;padding:5px 10px;font-family:inherit;font-size:12.5px;font-weight:600;display:inline-flex}.sr-langmenu-btn:hover,.sr-langmenu-btn.open{background:var(--sr-card);border-color:var(--sr-line);color:var(--sr-ink)}.sr-langmenu-pop{background:var(--sr-card);border:1px solid var(--sr-line);z-index:30;border-radius:10px;min-width:150px;padding:5px;position:absolute;top:calc(100% - 4px);right:14px;box-shadow:0 8px 28px #15201f24,0 1px 3px #15201f14}@media (width<=1199px){.sr-langmenu-btn span{display:none}.sr-d-top{padding-right:54px}}.sr-galaxy{aspect-ratio:21/9;touch-action:pan-y;background:#05070f;border-radius:8px;width:100%;min-height:340px;position:relative;overflow:hidden}.sr-galaxy-canvas{width:100%;height:100%;display:block;position:absolute;inset:0}.sr-galaxy-labels{pointer-events:none;position:absolute;inset:0;overflow:hidden}.sr-galaxy-hublabel{white-space:nowrap;text-shadow:0 0 6px #000000e6,0 1px 2px #000000e6;letter-spacing:.06em;-webkit-user-select:none;user-select:none;transition:opacity .25s,color .25s;position:absolute;transform:translate(-50%,-140%)}.sr-galaxy-hublabel.dim{opacity:.22}.sr-galaxy-hublabel.hot{text-shadow:0 0 14px,0 1px 2px #000000e6;color:#fff!important}.sr-galaxy-starlabel{white-space:nowrap;text-shadow:0 0 5px #000000f2,0 1px 2px #000000f2;letter-spacing:.03em;-webkit-user-select:none;user-select:none;font-size:11px;transition:opacity .25s;position:absolute;transform:translate(-50%,-160%)}.sr-galaxy-tooltip{color:#dfe6ff;pointer-events:none;z-index:3;background:#0a0e1ceb;border:1px solid #7896ff40;border-radius:8px;max-width:280px;padding:7px 11px;font-size:12.5px;line-height:1.5;display:none;position:absolute;box-shadow:0 4px 24px #00000080}.sr-galaxy-tooltip .trail{color:#8b97c9;margin-top:2px;font-size:11px}.sr-galaxy-hint{color:#55608a;pointer-events:none;z-index:2;font-size:11.5px;position:absolute;bottom:10px;left:14px}.sr-galaxy-legend{color:#8b97c9;pointer-events:none;z-index:2;gap:14px;font-size:11.5px;display:flex;position:absolute;bottom:10px;right:14px}.sr-galaxy-legend i{vertical-align:-1px;border-radius:50%;width:8px;height:8px;margin-right:5px;display:inline-block}@media (width<=720px){.sr-galaxy{aspect-ratio:4/3}}.ld-page{color:#dfe8ff;background:#050a17;height:100vh;position:relative;overflow:hidden auto}.ld-bg{z-index:0;background:url(/landing-bg.webp) 100%/cover no-repeat;position:fixed;inset:0}.ld-bg:after{content:"";background:linear-gradient(100deg,#0408128c 0%,#0408121a 45%,#04081200 70%);position:absolute;inset:0}.ld-starmap-card{align-self:stretch;align-items:center;min-width:0;display:flex;position:relative}.ld-starmap-wrap{pointer-events:none;mix-blend-mode:screen;width:100%}.ld-starmap{filter:drop-shadow(0 0 18px #6ec8ff1f);width:100%;height:auto;display:block}.ld-content{z-index:2;max-width:1500px;margin:0 auto;padding:0 42px;position:relative}.ld-nav{z-index:40;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#05091473;align-items:center;gap:34px;padding:14px 0;display:flex;position:sticky;top:0}.ld-brand{align-items:center;gap:10px;text-decoration:none;display:flex}.ld-brand-name{color:#f2f6ff;letter-spacing:.01em;font-size:20px;font-weight:800;line-height:1.05}.ld-brand-name em{color:#2fd9c0;font-style:normal}.ld-brand-name small{color:#7f8db3;letter-spacing:.02em;font-size:11px;font-weight:400;display:block}.ld-nav-links{align-items:center;gap:26px;display:flex}.ld-nav-link{color:#c6d2f2;cursor:pointer;background:0 0;border:none;align-items:center;gap:5px;padding:6px 2px;font-size:14.5px;display:inline-flex}.ld-nav-link:hover{color:#fff}.ld-nav-link.dropdown svg{transition:transform .18s}.ld-nav-link.dropdown.open svg{transform:rotate(180deg)}.ld-nav-actions{align-items:center;gap:12px;margin-left:auto;display:flex}.ld-lang{color:#aab6e8;cursor:pointer;background:#0c142a99;border:1px solid #8ca5ff40;border-radius:999px;padding:6px 14px;font-size:12.5px}.ld-lang:hover{color:#fff;border-color:#a0b9ff80}.ld-btn{cursor:pointer;border:1px solid #0000;border-radius:999px;align-items:center;gap:8px;padding:9px 20px;font-size:14px;font-weight:600;text-decoration:none;transition:border-color .15s,box-shadow .15s,color .15s;display:inline-flex}.ld-btn.ghost{color:#e6eeff;background:#0a122866;border-color:#96b4ff47}.ld-btn.ghost:hover{border-color:#aac8ff99}.ld-btn.solid{color:#04222b;background:linear-gradient(135deg,#35e2c8,#1fb9ab);box-shadow:0 4px 22px #2fd9c059}.ld-btn.solid:hover{box-shadow:0 4px 30px #2fd9c08c}.ld-btn.lg{padding:12px 26px;font-size:15px}.ld-mega{z-index:60;background:#080d1ef7;border:1px solid #7896ff38;border-radius:14px;grid-template-columns:1.4fr 1fr;gap:8px 30px;max-height:min(70vh,640px);padding:20px 24px;display:grid;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow:auto;box-shadow:0 24px 60px #0000008c}.ld-mega-col{grid-template-columns:repeat(2,minmax(0,1fr));align-content:start;gap:2px 16px;display:grid}.ld-mega-col:last-child{grid-template-columns:1fr}.ld-mega-head{letter-spacing:.14em;text-transform:uppercase;grid-column:1/-1;padding:4px 10px 8px;font-size:12px;font-weight:700}.ld-mega-head.math{color:#ffc46b}.ld-mega-head.physics{color:#6bc8ff}.ld-mega-item{border-radius:8px;flex-direction:column;gap:1px;padding:7px 10px;text-decoration:none;display:flex}.ld-mega-item span{color:#dfe8ff;font-size:13.5px}.ld-mega-item small{color:#6f7ea6;font-size:11px}a.ld-mega-item:hover{background:#7896ff24}.ld-mega-item.off{opacity:.5}.ld-hero{grid-template-columns:minmax(0,620px) minmax(0,1fr);align-items:center;gap:30px;padding:42px 0 26px;display:grid;position:relative}.ld-hero-card{color:#16233a;background:#e9f3f6f7;border-radius:20px;width:min(640px,100%);padding:36px 40px;box-shadow:0 30px 80px #00000073}.ld-badge{color:#10666b;background:#ffffffb0;border:1px solid #143c5024;border-radius:999px;align-items:center;gap:7px;padding:5px 13px;font-size:12.5px;display:inline-flex}.ld-hero-card h1{letter-spacing:-.01em;color:#10203a;margin:18px 0 14px;font-size:clamp(30px,3.3vw,44px);line-height:1.16}.ld-hero-card h1 em{color:#0aa79e;font-style:normal}.ld-hero-sub{color:#33445f;max-width:56ch;margin:0;font-size:15.5px;line-height:1.68}.ld-hero-ctas{flex-wrap:wrap;gap:14px;margin:24px 0 20px;display:flex}.ld-checks{border-top:1px solid #1432501a;flex-wrap:wrap;gap:8px 20px;margin:0;padding:14px 0 0;list-style:none;display:flex}.ld-checks li{color:#3a4f66;align-items:center;gap:6px;font-size:13px;display:inline-flex}.ld-checks svg{color:#0aa79e}.ld-explore-universe{z-index:3;pointer-events:auto;position:absolute;top:20px;right:4px}.sr-galaxy.light{background:#f6f8fd}.sr-galaxy.light .sr-galaxy-hublabel{text-shadow:0 0 6px #fffffff2,0 1px 2px #ffffffe6}.sr-galaxy.light .sr-galaxy-hublabel.hot{text-shadow:0 0 12px #fff,0 1px 2px #fff;color:#2b3355!important}.sr-galaxy.light .sr-galaxy-hublabel.dim{opacity:.25}.sr-galaxy.light .sr-galaxy-starlabel{text-shadow:0 0 5px #fffffff2,0 1px 2px #ffffffe6}.sr-galaxy.light .sr-galaxy-search{color:#8892b8;background:#fff;border-color:#dfe5f5;box-shadow:0 2px 10px #5064a014}.sr-galaxy.light .sr-galaxy-search input{color:#3d4566}.sr-galaxy.light .sr-galaxy-search input::placeholder{color:#9aa4c8}.sr-galaxy.light .sr-galaxy-search-pop{background:#fff;border-color:#dfe5f5;box-shadow:0 10px 34px #5064a02e}.sr-galaxy.light .sr-galaxy-search-pop button{color:#3d4566}.sr-galaxy.light .sr-galaxy-search-pop button:hover{background:#eef2fd}.sr-galaxy.light .sr-galaxy-zoom button{color:#5a6488;background:#fff;border-color:#dfe5f5;box-shadow:0 2px 8px #5064a014}.sr-galaxy.light .sr-galaxy-zoom button:hover{color:#2b3355;border-color:#b9c4ea}.sr-galaxy.light .sr-galaxy-legend{color:#5a6488}.sr-galaxy.light .sr-galaxy-legend.chips span{background:#fff;border-color:#dfe5f5;box-shadow:0 2px 8px #5064a014}.sr-galaxy.light .sr-galaxy-legend i.cross{background:linear-gradient(90deg,#f08c1a,#4a7df7)}.sr-galaxy.light .sr-galaxy-hint{color:#9aa4c8}.sr-galaxy.light .sr-galaxy-tooltip{color:#3d4566;background:#fff;border-color:#dfe5f5;box-shadow:0 6px 24px #5064a033}.sr-galaxy.light .sr-galaxy-tooltip .trail{color:#8892b8}.sp-page{background:#f6f8fd;height:100vh;padding:48px clamp(20px,5vw,80px);font-family:inherit;overflow-y:auto}.sp-hero{background:#fff;border-radius:24px;grid-template-columns:minmax(0,480px) minmax(0,1fr);align-items:center;gap:40px;padding:40px 48px;display:grid;box-shadow:0 10px 40px #5064a01a}.sp-copy h1{color:#3e4763;margin:0 0 14px;font-size:clamp(28px,3vw,40px);line-height:1.2}.sp-copy h1 em{color:#0000;background:linear-gradient(90deg,#8a63e8,#e070c8);-webkit-background-clip:text;background-clip:text;font-style:normal}.sp-copy p{color:#6a7391;margin:0 0 22px;font-size:15.5px;line-height:1.65}.sp-cta{color:#fff;cursor:pointer;background:#4a7df7;border:none;border-radius:10px;padding:13px 28px;font-size:15px;font-weight:600;box-shadow:0 6px 18px #4a7df759}.sp-map{pointer-events:none;min-width:0}.sp-map .ld-starmap{width:100%;height:auto;display:block}.sp-universe{background:#fff;border-radius:24px;margin-top:36px;padding:24px;box-shadow:0 10px 40px #5064a01a}.sp-universe h2{color:#3e4763;margin:0 0 4px;font-size:19px}.sp-universe>p{color:#6a7391;margin:0 0 14px;font-size:13px}.sp-dark-ref{background:#0a1020;border-radius:24px;margin-top:36px;padding:28px 48px;position:relative}.sp-ref-label{letter-spacing:.08em;text-transform:uppercase;color:#55608a;font-size:11.5px;position:absolute;top:14px;left:20px}@media (width<=1000px){.sp-hero{grid-template-columns:1fr}}.lp-page{color:#16233a;height:100vh;overflow:hidden auto}.lp-bg{z-index:0;background:url(/landing-bg.webp) 50%/cover no-repeat;position:fixed;inset:0}.lp-shell{z-index:1;flex-direction:column;gap:16px;max-width:1440px;margin:0 auto;padding:14px clamp(14px,3vw,36px) 36px;display:flex;position:relative}.lp-nav,.lp-universe-card,.lp-rigor{-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f4f9ffdb;border:1px solid #ffffffa6;border-radius:18px;box-shadow:0 12px 40px #0a193c40}.lp-nav{z-index:40;align-items:center;gap:30px;padding:10px 22px;display:flex;position:sticky;top:10px}.lp-brand{align-items:center;gap:10px;text-decoration:none;display:flex}.lp-brand-name{color:#16233a;font-size:19px;font-weight:800;line-height:1.05}.lp-brand-name em{color:#0eb5a6;font-style:normal}.lp-brand-name small{color:#6d7b9c;font-size:10.5px;font-weight:400;display:block}.lp-nav-links{align-items:center;gap:24px;margin:0 auto;display:flex}.lp-nav-link{color:#33436e;cursor:pointer;background:0 0;border:none;align-items:center;gap:5px;padding:8px 2px;font-size:14.5px;font-weight:500;display:inline-flex}.lp-nav-link:hover{color:#10203a}.lp-nav-link.dropdown svg{transition:transform .18s}.lp-nav-link.dropdown.open svg{transform:rotate(180deg)}.lp-nav-actions{align-items:center;gap:10px;display:flex}.lp-lang{color:#5a6488;cursor:pointer;background:#ffffffd9;border:1px solid #d6def0;border-radius:999px;padding:6px 13px;font-size:12.5px}.lp-lang:hover{color:#16233a;border-color:#aebadd}.lp-btn{cursor:pointer;border:1px solid #0000;border-radius:12px;align-items:center;gap:8px;padding:9px 18px;font-size:14px;font-weight:600;text-decoration:none;transition:box-shadow .15s,border-color .15s,transform .1s;display:inline-flex}.lp-btn.ghost{color:#24355c;background:#ffffffeb;border-color:#d6def0}.lp-btn.ghost:hover{border-color:#aebadd}.lp-btn.solid{color:#fff;background:linear-gradient(135deg,#23d3bd,#0fae9f);box-shadow:0 6px 20px #10b4a373}.lp-btn.solid:hover{transform:translateY(-1px);box-shadow:0 8px 28px #10b4a399}.lp-btn.lg{border-radius:14px;padding:12px 26px;font-size:15px}.lp-mega{z-index:60;background:#fffffff7;border:1px solid #e0e7f6;border-radius:16px;grid-template-columns:1.4fr 1fr;gap:8px 30px;max-height:min(70vh,640px);padding:20px 26px 24px;display:grid;position:absolute;top:calc(100% + 8px);left:0;right:0;overflow:auto;box-shadow:0 30px 70px #0a193c4d}.lp-mega-col{grid-template-columns:repeat(2,minmax(0,1fr));align-content:start;gap:2px 16px;display:grid}.lp-mega-col:last-child{grid-template-columns:1fr}.lp-mega-head{letter-spacing:.14em;text-transform:uppercase;grid-column:1/-1;padding:4px 10px 8px;font-size:12px;font-weight:700}.lp-mega-head.math{color:#d97a0b}.lp-mega-head.physics{color:#2f5fd9}.lp-mega-item{border-radius:10px;flex-direction:column;gap:1px;padding:7px 10px;text-decoration:none;display:flex}.lp-mega-item span{color:#2b3a63;font-size:13.5px}.lp-mega-item small{color:#93a0c4;font-size:11px}a.lp-mega-item:hover{background:#eef4fd}.lp-mega-item.off{opacity:.55}.lp-hero{min-height:430px;box-shadow:none;background:0 0;border:none;align-items:center;display:flex;position:relative}.lp-hero:before{content:"";-webkit-backdrop-filter:blur(14px);pointer-events:none;background:#f4f9ffed;border-radius:18px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(90deg,#000 0% 63%,#00000080 78%,#0000 92%);mask-image:linear-gradient(90deg,#000 0% 63%,#00000080 78%,#0000 92%)}.lp-hero-copy{z-index:1;width:60%;max-width:none;padding:40px 44px;position:relative}.lp-badge{color:#0f9e91;background:#ffffffe6;border:1px solid #d9e2f2;border-radius:999px;align-items:center;gap:7px;padding:6px 13px;font-size:12.5px;font-weight:500;display:inline-flex}.lp-hero h1{letter-spacing:-.015em;color:#10203a;margin:16px 0 14px;font-size:clamp(30px,3.4vw,46px);line-height:1.14}.lp-hero h1 em{color:#0eb5a6;font-style:normal}.lp-hero-points{border-left:2px solid #0eb5a673;flex-direction:column;gap:9px;margin:0;padding:0 0 0 15px;list-style:none;display:flex}.lp-hero-points li{color:#33445f;max-width:54ch;font-size:15px;line-height:1.6}.lp-ctas{flex-wrap:wrap;gap:13px;margin:22px 0 18px;display:flex}.lp-checks{border-top:1px solid #1432501a;flex-wrap:nowrap;align-items:center;gap:16px;width:calc(100% + 96px);margin:0;padding:14px 0 0;list-style:none;display:flex}.lp-checks li{white-space:nowrap;color:#33445f;align-items:center;gap:6px;font-size:11.5px;display:inline-flex}.lp-checks svg{color:#0eb5a6;flex:none}.lp-bottom{grid-template-columns:minmax(0,1fr) 370px;align-items:stretch;gap:16px;display:grid}.lp-universe-card{padding:20px 22px 22px}.lp-universe-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:14px;display:flex}.lp-universe-titles h2{color:#10203a;margin:0 0 4px;font-size:19px}.lp-universe-titles p{color:#5f6b8a;margin:0;font-size:12.5px}.lp-universe-tools{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.lp-search{color:#8892b8;background:#fff;border:1px solid #d6def0;border-radius:999px;align-items:center;gap:8px;padding:7px 14px;display:flex;position:relative}.lp-search input{color:#24355c;background:0 0;border:none;outline:none;width:150px;font-size:13px}.lp-search input::placeholder{color:#9aa4c8}.lp-search-pop{z-index:20;background:#fff;border:1px solid #dfe5f5;border-radius:10px;width:300px;position:absolute;top:calc(100% + 8px);left:0;overflow:hidden;box-shadow:0 10px 34px #0a193c33}.lp-search-pop button{color:#24355c;text-align:left;cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;gap:10px;width:100%;padding:8px 13px;font-size:13px;display:flex}.lp-search-pop button:hover{background:#eef4fd}.lp-search-pop i{border-radius:50%;flex:none;width:7px;height:7px}.lp-search-pop i.math{background:#ffc46b}.lp-search-pop i.physics{background:#6bc8ff}.lp-chips{flex-wrap:wrap;gap:6px;display:flex}.lp-chip{color:#4d5b83;cursor:pointer;background:#fff;border:1px solid #d6def0;border-radius:999px;padding:6px 13px;font-size:12px;font-weight:500}.lp-chip:hover{border-color:#aebadd}.lp-chip.active{color:#fff;background:#0eb5a6;border-color:#0eb5a6}.lp-galaxy-frame{border-radius:14px;position:relative;overflow:hidden}.lp-galaxy-frame .sr-galaxy{border-radius:14px}.lp-galaxy-zoom{z-index:4;flex-direction:column;gap:8px;display:flex;position:absolute;bottom:12px;left:12px}.lp-galaxy-zoom button{color:#d5def5;cursor:pointer;background:#0e162ccc;border:1px solid #8ca5ff4d;border-radius:8px;place-items:center;width:32px;height:32px;display:grid}.lp-galaxy-zoom button:hover{color:#fff;border-color:#aac3ff99}.lp-rigor{align-self:stretch;padding:22px}.lp-rigor h2{color:#10203a;margin:0 0 6px;font-size:19px}.lp-rigor-sub{color:#5f6b8a;margin:0 0 16px;font-size:12.5px;line-height:1.6}.lp-why{border-top:1px solid #14325a17;margin:0;padding:0;list-style:none}.lp-why li{border-bottom:1px solid #14325a17;align-items:flex-start;gap:12px;padding:13px 0;display:flex}.lp-why-ico{color:#0d9488;background:#dcf3f0;border-radius:10px;flex:none;place-items:center;width:34px;height:34px;display:grid}.lp-why-txt{min-width:0}.lp-why-txt strong{color:#14263f;margin-bottom:2px;font-size:13.5px;font-weight:600;display:block}.lp-why-txt small{color:#52627c;font-size:12px;line-height:1.5;display:block}.lp-rigor blockquote{margin:16px 0 0;padding:0}.lp-rigor blockquote p{color:#0f9e91;margin:0 0 6px;font-size:12.5px;font-style:italic;line-height:1.65}.lp-rigor cite{color:#5f6b8a;font-size:11.5px;font-style:normal}@media (width<=1100px){.lp-nav-link:not(.dropdown){display:none}.lp-hero-copy{width:74%}.lp-bottom,.lp-mega{grid-template-columns:1fr}.lp-hero:before{background-position:right 20%}}@media (width<=640px){.lp-brand-name small{display:none}.lp-nav{gap:12px}.lp-nav-actions{gap:8px}.lp-nav-actions .lp-btn.solid{display:none}.lp-mega-col{grid-template-columns:1fr}.lp-hero-copy{width:100%;padding:26px 22px}.lp-hero:before{-webkit-mask-image:none;mask-image:none}.lp-nav{flex-wrap:wrap}.lp-nav-links{order:3;width:100%;margin:0}.lp-search input{width:110px}}.sr-galaxy-hublabel.filtered{opacity:.14!important}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@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}
