@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--default-font-family:var(--font-sans);--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}}@layer components;@layer utilities{.start{inset-inline-start:var(--spacing)}}:root{--ink:#152b2b;--muted:#6f8080;--teal:#087e78;--teal-dark:#075f5b;--mint:#dff3ef;--cream:#f6f4ed;--line:#dde6e3;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:#f7faf9;margin:0;font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,sans-serif}button,input{font:inherit}button{color:inherit}.app-shell{min-height:100vh;overflow:hidden}.topbar{border-bottom:1px solid var(--line);z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff5;justify-content:space-between;align-items:center;height:76px;padding:0 5vw;display:flex;position:sticky;top:0}.brand{cursor:pointer;text-align:left;background:0 0;border:0;align-items:center;gap:12px;padding:0;display:flex}.brand-mark{background:var(--teal);color:#fff;border-radius:12px;place-items:center;width:40px;height:40px;font-size:27px;font-weight:300;display:grid;transform:rotate(-10deg);box-shadow:0 6px 18px #087e782e}.brand strong{letter-spacing:.15em;font-size:20px;display:block}.brand small{color:var(--muted);letter-spacing:.16em;font-size:10px}.main-nav{align-items:center;gap:4px;height:100%;display:flex}.nav-item{color:#526564;cursor:pointer;background:0 0;border:0;align-items:center;gap:7px;height:100%;padding:0 18px;font-size:14px;display:flex;position:relative}.nav-item span{font-size:18px}.nav-item:hover,.nav-item.active{color:var(--teal)}.nav-item.active:after{content:"";background:var(--teal);border-radius:3px 3px 0 0;height:3px;position:absolute;bottom:0;left:18px;right:18px}.header-actions,.auth-actions{align-items:center;gap:10px;display:flex}.search-button,.text-button{cursor:pointer;background:0 0;border:0;padding:9px 10px}.search-button{color:#607170;font-size:26px}.text-button:hover{color:var(--teal)}.primary-button{color:#fff;background:var(--teal);cursor:pointer;border:0;border-radius:7px;padding:14px 23px;transition:transform .2s,background .2s;box-shadow:0 8px 18px #087e7829}.primary-button:hover{background:var(--teal-dark);transform:translateY(-1px)}.primary-button.small{padding:10px 17px;font-size:13px}.profile-wrap{position:relative}.profile-button{cursor:pointer;background:#f0f7f5;border:0;border-radius:24px;align-items:center;gap:8px;padding:5px 11px 5px 5px;font-size:13px;display:flex}.avatar{background:var(--teal);color:#fff;border-radius:50%;place-items:center;width:31px;height:31px;display:grid}.chevron{color:var(--muted)}.profile-menu{border:1px solid var(--line);background:#fff;border-radius:12px;flex-direction:column;min-width:210px;padding:16px;display:flex;position:absolute;top:48px;right:0;box-shadow:0 15px 45px #142c2a24}.profile-menu small{color:var(--muted);margin:4px 0 12px}.profile-menu button{border:0;border-top:1px solid var(--line);text-align:left;cursor:pointer;color:#b24545;background:0 0;padding:10px 0 0}.hero{background:linear-gradient(135deg,#eef8f5 0%,#f8f8f0 56%,#e7f4f0 100%);grid-template-columns:1.05fr .95fr;min-height:555px;padding:76px 9vw 70px;display:grid;position:relative}.hero:before{content:"";background-image:radial-gradient(#087e781c 1px,#0000 1px);background-size:24px 24px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(90deg,#0000 0% 46%,#000 90%);mask-image:linear-gradient(90deg,#0000 0% 46%,#000 90%)}.hero-copy{z-index:2;max-width:640px;position:relative}.eyebrow,.section-kicker{letter-spacing:.2em;color:var(--teal);font-size:11px;font-weight:700}.hero h1{letter-spacing:-.03em;margin:20px 0 22px;font-family:Songti SC,Noto Serif CJK SC,serif;font-size:clamp(44px,5vw,70px);font-weight:700;line-height:1.16}.hero h1 em{color:var(--teal);font-style:normal}.hero-copy>p{color:#5e7371;max-width:585px;margin:0 0 30px;font-size:17px;line-height:1.9}.hero-actions{gap:14px;display:flex}.outline-button{cursor:pointer;background:#ffffff85;border:1px solid #b6c9c5;border-radius:7px;padding:13px 22px}.outline-button:hover{border-color:var(--teal);color:var(--teal)}.hero-notes{color:#6e807f;gap:22px;margin-top:28px;font-size:12px;display:flex}.hero-notes span:first-letter{color:var(--teal)}.hero-visual{z-index:1;min-height:390px;position:relative}.molecule-core{color:#fff;z-index:3;background:radial-gradient(circle at 34% 28%,#44beb2,#0c716b 65%);border-radius:50%;place-items:center;width:142px;height:142px;display:grid;position:absolute;top:44%;left:50%;transform:translate(-50%,-50%);box-shadow:0 28px 80px #0559544d,inset -12px -16px 30px #00302d40}.molecule-core span{font-family:Georgia,serif;font-size:24px}.orbit{border:1px solid #087e7840;border-radius:50%;position:absolute;top:44%;left:50%;transform:translate(-50%,-50%)rotate(-18deg)}.orbit-one{width:390px;height:190px}.orbit-two{width:280px;height:360px;transform:translate(-50%,-50%)rotate(55deg)}.orbit i{background:#e79a36;border-radius:50%;width:17px;height:17px;position:absolute;box-shadow:0 3px 12px #97550959}.orbit-one i:first-child{top:82px;left:15px}.orbit-one i:nth-child(2){top:40px;right:24px}.orbit-one i:nth-child(3){background:#7559c8;bottom:-8px;left:190px}.orbit-two i:first-child{background:#7559c8;top:15px;left:145px}.orbit-two i:nth-child(2){bottom:24px;left:45px}.formula-card{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:5;background:#ffffffb8;border:1px solid #ffffffd9;border-radius:12px;width:245px;padding:18px 20px;position:absolute;top:5%;left:6%;box-shadow:0 18px 42px #2654501a}.formula-card .formula-label{color:var(--teal);margin-bottom:8px;font-size:10px;display:block}.formula-card strong{font-family:Georgia,serif;font-size:21px;font-weight:500}.formula-line{background:#dde7e4;border-radius:3px;height:3px;margin:14px 0 8px}.formula-line span{background:#e69937;height:100%;display:block}.formula-card small{color:var(--muted)}.state-tag{color:#4e6765;background:#ffffffc2;border:1px solid #fff;border-radius:7px;padding:8px 13px;font-family:Georgia,serif;font-size:12px;position:absolute;box-shadow:0 8px 30px #2a48461a}.tag-one{top:20%;right:4%}.tag-two{bottom:16%;right:11%}.learning-strip{z-index:4;background:#fff;border-radius:10px;grid-template-columns:1fr 1.5fr auto;align-items:center;gap:34px;width:min(82%,1250px);min-height:96px;margin-top:-20px;margin-left:auto;margin-right:auto;padding:18px 28px;display:grid;position:relative;box-shadow:0 15px 45px #1d3f3c1f}.learning-strip>div:first-child{align-items:center;gap:13px;display:flex}.strip-icon{background:var(--mint);width:42px;height:42px;color:var(--teal);border-radius:10px;place-items:center;display:grid}.learning-strip small,.learning-strip strong{display:block}.learning-strip small{color:var(--muted);margin-bottom:4px;font-size:11px}.learning-strip strong{font-size:14px}.strip-progress>span{color:var(--muted);justify-content:space-between;font-size:11px;display:flex}.strip-progress>div{background:#e7eeee;border-radius:4px;height:6px;margin:8px 0;overflow:hidden}.strip-progress i{background:var(--teal);border-radius:4px;height:100%;display:block}.strip-progress b{color:var(--ink)}.learning-strip>button{color:var(--teal);cursor:pointer;white-space:nowrap;background:0 0;border:0;font-weight:700}.platform-section{width:min(82%,1250px);margin:78px auto 90px}.architecture-note{color:var(--muted);white-space:nowrap;background:#edf5f3;border:1px solid #dbe9e6;border-radius:20px;padding:8px 12px;font-size:11px}.platform-grid{grid-template-columns:repeat(3,1fr);gap:14px;display:grid}.platform-card{--module-color:var(--teal);border:1px solid var(--line);text-align:left;cursor:pointer;background:#fff;border-radius:12px;min-height:270px;padding:22px;transition:transform .22s,border-color .22s,box-shadow .22s;position:relative;overflow:hidden}.platform-card:after{content:"";background:var(--module-color);border-radius:50%;width:150px;height:150px;position:absolute;top:-85px;right:-78px}@supports (color:color-mix(in lab, red, red)){.platform-card:after{background:color-mix(in srgb,var(--module-color) 12%,transparent)}}.platform-card:hover{border-color:var(--module-color);transform:translateY(-4px)}@supports (color:color-mix(in lab, red, red)){.platform-card:hover{border-color:color-mix(in srgb,var(--module-color) 55%,white)}}.platform-card:hover{box-shadow:0 16px 38px #183d3a1a}.platform-card-top{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.platform-code{color:#9aa8a6;font-family:Georgia,serif;font-size:12px}.platform-icon{background:var(--module-color);border-radius:10px;place-items:center;width:39px;height:39px;display:grid}@supports (color:color-mix(in lab, red, red)){.platform-icon{background:color-mix(in srgb,var(--module-color) 12%,white)}}.platform-icon{color:var(--module-color);font-size:20px}.platform-english{letter-spacing:.18em;color:var(--module-color);font-size:8px;font-weight:700}.platform-card h3{margin:7px 0 10px;font-family:Songti SC,serif;font-size:21px}.platform-card p{color:var(--muted);min-height:55px;margin:0 0 13px;font-size:11px;line-height:1.65}.platform-tools{flex-wrap:wrap;gap:5px;display:flex}.platform-tools span{color:#627573;background:#f3f7f6;border-radius:3px;padding:4px 6px;font-size:8px}.platform-card>strong{color:var(--module-color);margin-top:18px;font-size:10px;display:block}.platform-card>strong span{float:right;font-size:15px}.content-section,.chapter-section{width:min(82%,1250px);margin:74px auto}.section-heading{justify-content:space-between;align-items:end;margin-bottom:27px;display:flex}.section-heading h2{margin:7px 0 5px;font-family:Songti SC,serif;font-size:30px}.section-heading p{color:var(--muted);margin:0;font-size:13px}.section-heading>button{color:var(--teal);cursor:pointer;background:0 0;border:0}.dashboard-grid{grid-template-columns:1.05fr .95fr .85fr;gap:18px;display:grid}.dashboard-grid article{border:1px solid var(--line);background:#fff;border-radius:12px;padding:24px;box-shadow:0 8px 25px #1d3f3c0e}.card-topline,.card-title-row{color:var(--muted);justify-content:space-between;align-items:center;font-size:11px;display:flex}.chapter-badge{background:var(--teal);color:#fff;border-radius:4px;padding:5px 9px;font-size:10px;display:inline-block}.continue-card h3{margin:17px 0 5px;font-size:22px}.continue-card>p{color:var(--muted);margin:0 0 20px;font-size:12px}.lesson-preview{background:#f2f8f6;border-radius:8px;align-items:center;gap:18px;padding:17px;display:flex}.lesson-preview small,.lesson-preview strong,.lesson-preview p{margin:0;display:block}.lesson-preview small{color:var(--teal);font-size:9px}.lesson-preview strong{margin:5px 0;font-size:13px}.lesson-preview p{color:var(--muted);font-size:10px}.energy-bars{border-bottom:1px solid #9dc7c2;align-items:end;gap:5px;width:68px;height:65px;display:flex}.energy-bars i{background:var(--teal);border-radius:2px 2px 0 0;width:8px}.energy-bars i:first-child{height:18%}.energy-bars i:nth-child(2){height:36%}.energy-bars i:nth-child(3){height:52%}.energy-bars i:nth-child(4){background:#e69b38;height:73%}.energy-bars i:nth-child(5){background:#e69b38;height:91%}.card-progress{align-items:center;gap:10px;margin:18px 0;display:flex}.card-progress>span{background:#e7eeee;border-radius:4px;flex:1;height:4px;overflow:hidden}.card-progress i{background:var(--teal);width:50%;height:100%;display:block}.card-progress small{color:var(--muted);font-size:10px}.continue-card>button{border:1px solid var(--teal);width:100%;color:var(--teal);cursor:pointer;background:#fff;border-radius:5px;padding:10px}.card-title-row>div{align-items:center;gap:10px;display:flex}.card-title-row small,.card-title-row strong{display:block}.card-title-row small{color:var(--muted);font-size:9px}.card-title-row strong{margin-top:3px;font-size:14px}.mini-icon{color:#fff;border-radius:8px;place-items:center;width:34px;height:34px;font-size:17px;display:grid}.purple{background:#7c58d4}.orange{background:#e8972f}.difficulty{color:#b36f13;background:#fff4df;border-radius:4px;padding:4px 7px}.daily-card>p{margin:22px 0 15px;font-family:Songti SC,serif;font-size:14px;line-height:1.75}.options{grid-template-columns:1fr 1fr;gap:8px;display:grid}.options button{border:1px solid var(--line);text-align:left;cursor:pointer;background:#fafcfb;border-radius:6px;padding:8px;font-size:11px}.options button span{background:#eef2f1;border-radius:50%;place-items:center;width:21px;height:21px;margin-right:7px;display:inline-grid}.options button:hover{border-color:var(--teal)}.options button.correct{color:#177550;background:#ecfaf4;border-color:#2a9d6f}.daily-footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;margin-top:15px;padding-top:12px;font-size:9px;display:flex}.daily-footer span{color:#c47521}.week-label{font-size:9px}.study-time{justify-content:space-between;align-items:end;margin:24px 0 14px;display:flex}.study-time>strong{font-size:31px}.study-time>strong small{color:var(--muted);font-size:11px;font-weight:400}.study-time>span{color:#24946d;font-size:10px}.study-time>span small{color:var(--muted)}.bar-chart{border-bottom:1px solid var(--line);align-items:end;gap:8px;height:115px;display:flex}.bar-chart>div{flex:1;align-items:end;height:100%;padding-bottom:19px;display:flex;position:relative}.bar-chart i{background:#cfe8e3;border-radius:3px 3px 0 0;width:100%;min-height:4px;display:block}.bar-chart i.today{background:var(--teal)}.bar-chart small{text-align:center;width:100%;color:var(--muted);font-size:8px;position:absolute;bottom:2px}.stat-mini-grid{text-align:center;grid-template-columns:repeat(3,1fr);margin-top:17px;display:grid}.stat-mini-grid div+div{border-left:1px solid var(--line)}.stat-mini-grid strong,.stat-mini-grid small{display:block}.stat-mini-grid strong{font-size:15px}.stat-mini-grid small{color:var(--muted);margin-top:4px;font-size:8px}.chapter-section{margin-top:90px}.section-heading.compact{align-items:center}.legend{color:var(--muted);gap:15px;font-size:10px;display:flex}.legend span{align-items:center;gap:5px;display:flex}.legend i{background:#d7dfdd;border-radius:50%;width:8px;height:8px}.legend .doing{background:#e99a36}.legend .done{background:var(--teal)}.chapter-grid{grid-template-columns:repeat(3,1fr);gap:13px;display:grid}.chapter-card{border:1px solid var(--line);text-align:left;cursor:pointer;background:#fff;border-radius:10px;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:19px;transition:all .2s;display:grid}.chapter-card:hover{border-color:#8fc7c2;transform:translateY(-2px);box-shadow:0 9px 24px #1c4c4714}.chapter-number{font-family:Georgia,serif;font-size:27px}.chapter-info strong,.chapter-info small,.chapter-info span{display:block}.chapter-info strong{font-size:14px}.chapter-info small{color:var(--muted);margin:5px 0 9px;font-size:10px}.chapter-info span{color:#95a19f;font-size:9px}.complete-ring,.progress-ring,.empty-ring{--p:0deg;background:conic-gradient(var(--teal) var(--p),#e7eeec 0);border-radius:50%;place-items:center;width:42px;height:42px;font-size:9px;display:grid;position:relative}.complete-ring:before,.progress-ring:before,.empty-ring:before{content:"";background:#fff;border-radius:50%;position:absolute;inset:4px}.chapter-state span{color:var(--teal)}.chapter-state span:after{content:attr(data-label)}.chapter-state span{isolation:isolate}.chapter-state span>*{z-index:2}.chapter-state span{font-weight:700}.chapter-state span:before{z-index:-1}.empty-ring{color:#a5b0ae;background:#eef2f1}.module-center{--module-color:var(--teal);background:#f6f9f8;min-height:calc(100vh - 76px);padding-bottom:80px}.module-hero{background:linear-gradient(135deg,var(--module-color),#fbfaf5);min-height:290px}@supports (color:color-mix(in lab, red, red)){.module-hero{background:linear-gradient(135deg,color-mix(in srgb,var(--module-color) 11%,#f5f7f3),#fbfaf5)}}.module-hero{grid-template-columns:1fr 280px;align-items:center;padding:58px max(9vw,50vw - 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