:root{color:#172b3f;font-synthesis:none;--primary:#0b5cab;--primary-dark:#084a8a;--teal:#0f8f88;--ink:#172b3f;--muted:#65778a;--line:#dbe5ee;--soft:#f4f7fa;--surface:#fff;--danger:#c43d4b;--radius:6px;background:#eef3f7;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Arial,sans-serif}*{box-sizing:border-box;letter-spacing:0}html{-webkit-text-size-adjust:100%;background:#eef3f7}body{background:#eef3f7;min-width:320px;margin:0}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.mobile-shell{background:var(--surface);width:100%;max-width:520px;min-height:100dvh;padding-bottom:calc(68px + env(safe-area-inset-bottom));margin:0 auto;position:relative;overflow-x:hidden}.app-head{z-index:30;height:calc(58px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 16px 0;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff5;justify-content:space-between;align-items:center;display:flex;position:sticky;top:0}.brand{text-align:left;background:0 0;border:0;align-items:center;gap:9px;min-width:0;padding:0;display:flex}.brand img{border-radius:var(--radius);width:34px;height:34px}.brand span{align-items:baseline;gap:6px;display:flex}.brand b{font-size:17px;font-weight:700;line-height:1}.brand small{color:var(--muted);font-size:11px}.head-action{border:1px solid var(--line);width:38px;height:38px;color:var(--primary);background:#fff;border-radius:50%;place-items:center;padding:0;display:grid;overflow:hidden}.head-action img{object-fit:cover;width:100%;height:100%}.page{min-height:calc(100dvh - 126px)}.home-page{padding-bottom:12px}.home-search{background:#f3f8fc;border-bottom:1px solid #e2ebf2;padding:24px 16px 18px}.home-search>div small,.section-heading small,.page-intro>small,.profile-summary small,.account-empty>small,.login-sheet>small,.wechat-confirm-card>small{color:var(--teal);margin-bottom:5px;font-size:11px;font-weight:700;line-height:1.2;display:block}.home-search h1{color:var(--ink);margin:0 0 16px;font-size:24px;font-weight:700;line-height:1.32}.search-bar{border-radius:var(--radius);min-height:46px;color:var(--muted);background:#fff;border:1px solid #cbd9e5;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;padding-left:13px;display:grid;overflow:hidden}.search-bar:focus-within{border-color:var(--primary);box-shadow:none}.search-bar input{min-width:0;height:44px;color:var(--ink);background:0 0;border:0;outline:0;padding:0 10px;font-size:14px}.search-bar input:focus{box-shadow:none;border:0}.search-bar button:focus,.search-bar button:focus-visible{box-shadow:none;outline:0}.search-bar button{border:0;border-left:1px solid var(--line);min-width:62px;color:var(--primary);background:#fff;align-self:stretch;font-size:14px;font-weight:600}.home-banner{aspect-ratio:16/7;border-radius:var(--radius);background:var(--soft);touch-action:pan-y;-webkit-user-select:none;user-select:none;margin:16px;position:relative;overflow:hidden}.home-banner>a,.home-banner img{width:100%;height:100%}.home-banner img{object-fit:cover}.banner-dots{gap:5px;display:flex;position:absolute;bottom:9px;right:10px}.banner-dots button{background:#ffffff9e;border:0;border-radius:50%;width:6px;height:6px;padding:0}.banner-dots button.active{background:#fff;border-radius:3px;width:17px}.content-section{background:#fff;border-top:1px solid #e8eef3;padding:22px 16px}.home-banner+.content-section{border-top:0}.section-band{background:#f6f9fb}.section-heading{justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:14px;display:flex}.section-heading h2{color:var(--ink);margin:0;font-size:20px;font-weight:700;line-height:1.25}.section-heading>a{min-height:32px;color:var(--primary);flex:none;align-items:center;gap:3px;font-size:13px;font-weight:600;display:inline-flex}.course-scroll{overscroll-behavior-inline:contain;scrollbar-width:none;scroll-snap-type:x proximity;gap:10px;margin-right:-16px;padding-right:16px;display:flex;overflow-x:auto}.course-scroll::-webkit-scrollbar{display:none}.category-primary::-webkit-scrollbar{display:none}.home-quick-section{padding-top:8px}.quick-access-grid{gap:10px;display:grid}.quick-access-item{border:1px solid var(--line);border-radius:var(--radius);scroll-snap-align:start;background:#fff;grid-template-columns:88px minmax(0,1fr) auto;align-items:center;gap:10px;width:100%;min-height:84px;display:grid;overflow:hidden}.quick-access-item>img{object-fit:cover;width:88px;height:84px}.quick-access-item>span{min-width:0}.quick-access-item b,.quick-access-item small{text-overflow:ellipsis;display:block;overflow:hidden}.quick-access-item b{color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:14px;font-weight:600;line-height:1.4;display:-webkit-box}.quick-access-item small{color:var(--muted);white-space:nowrap;margin-top:4px;font-size:12px}.quick-access-item>svg{color:var(--primary);margin-right:10px}.course-card{border:1px solid var(--line);border-radius:var(--radius);scroll-snap-align:start;background:#fff;flex:0 0 258px;overflow:hidden}.course-card figure{aspect-ratio:16/9;background:#dce9f3;margin:0;position:relative;overflow:hidden}.course-card figure.tone-teal{background:#dceeea}.course-card figure.tone-navy{background:#dae2eb}.course-card figure.tone-green{background:#e1eee5}.course-card figure img{object-fit:cover;width:100%;height:100%}.course-card figure span{color:#fff;background:#0b2237d1;border-radius:4px;align-items:center;gap:4px;padding:5px 7px;font-size:11px;font-weight:600;display:inline-flex;position:absolute;bottom:9px;left:9px}.course-card>div{padding:12px}.course-card>div>small{color:var(--teal);text-overflow:ellipsis;white-space:nowrap;margin-bottom:5px;font-size:11px;display:block;overflow:hidden}.course-card h3{min-height:42px;color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:15px;font-weight:600;line-height:1.4;display:-webkit-box;overflow:hidden}.course-card p{color:var(--muted);align-items:center;gap:4px;margin:9px 0 0;font-size:12px;display:flex}.compact-list{border-top:1px solid var(--line)}.compact-item{border-bottom:1px solid var(--line);grid-template-columns:92px minmax(0,1fr) auto;align-items:center;gap:11px;min-height:92px;padding:12px 0;display:grid}.compact-item>img,.compact-item>.image-fallback{object-fit:cover;border-radius:4px;width:92px;height:68px}.image-fallback{color:var(--primary);background:#eaf1f6;place-items:center;display:grid}.compact-item>span{min-width:0}.compact-item small,.compact-item b,.compact-item p{display:block}.compact-item small{color:var(--teal);text-overflow:ellipsis;white-space:nowrap;margin-bottom:4px;font-size:11px;overflow:hidden}.compact-item b{color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:14px;font-weight:600;line-height:1.45;display:-webkit-box;overflow:hidden}.compact-item p{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin:4px 0 0;font-size:12px;line-height:1.4;overflow:hidden}.compact-item>svg{color:#8ba0b3}.master-class{border-radius:var(--radius);background:#fff;border:1px solid #cddde9;grid-template-columns:42% minmax(0,1fr);min-height:150px;display:grid;overflow:hidden}.master-class>img{object-fit:cover;width:100%;height:100%;min-height:150px}.master-class>div{align-self:center;min-width:0;padding:14px}.master-class small{color:var(--teal);font-size:11px;font-weight:600}.master-class h3{color:var(--ink);-webkit-line-clamp:3;-webkit-box-orient:vertical;margin:7px 0;font-size:16px;font-weight:700;line-height:1.4;display:-webkit-box;overflow:hidden}.master-class p{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin:0 0 9px;font-size:12px;overflow:hidden}.master-class div>span{color:var(--primary);align-items:center;gap:4px;font-size:13px;font-weight:600;display:inline-flex}.latest-list{border-top:1px solid var(--line)}.latest-list>a{border-bottom:1px solid var(--line);grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:11px;min-height:74px;display:grid}.latest-list>a>svg:first-child{color:var(--teal)}.latest-list span{min-width:0}.latest-list small,.latest-list b{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.latest-list small{color:var(--muted);margin-bottom:5px;font-size:11px}.latest-list b{color:var(--ink);font-size:14px;font-weight:600}.latest-list>a>svg:last-child{color:#8ba0b3}.page-intro{border-bottom:1px solid var(--line);background:#f3f8fc;padding:24px 16px 18px}.page-intro h1{color:var(--ink);margin:0;font-size:24px;font-weight:700;line-height:1.25}.page-intro p{color:var(--muted);margin:7px 0 0;font-size:13px;line-height:1.55}.category-primary{top:calc(58px + env(safe-area-inset-top));z-index:20;border-bottom:1px solid var(--line);scrollbar-width:none;background:#fffffff7;gap:7px;padding:10px 16px;display:flex;position:sticky;overflow-x:auto}.category-primary button{border:1px solid var(--line);border-radius:var(--radius);color:#53697c;background:#fff;flex:none;justify-content:center;align-items:center;gap:6px;min-width:92px;min-height:40px;padding:0 14px;font-size:14px;font-weight:600;display:inline-flex}.category-primary button.active{border-color:var(--primary);background:var(--primary);color:#fff}.category-browser{border-bottom:8px solid var(--soft);padding:20px 16px 8px}.category-browser>header{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:10px;display:flex}.category-browser h2{margin:0;font-size:20px;font-weight:700}.category-browser p{color:var(--muted);margin:5px 0 0;font-size:12px}.category-browser>header>button{border:1px solid var(--line);border-radius:var(--radius);min-width:54px;min-height:34px;color:var(--primary);background:#fff;font-size:13px;font-weight:600}.category-browser>header>button.active{border-color:var(--primary);background:#eaf3fb}.category-groups details{border-top:1px solid var(--line)}.category-groups summary{cursor:pointer;min-height:48px;color:var(--ink);grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:7px;font-size:14px;font-weight:600;list-style:none;display:grid}.category-groups summary::-webkit-details-marker{display:none}.category-groups summary small{color:var(--muted);font-size:11px;font-weight:400}.category-groups details[open] summary svg{transform:rotate(180deg)}.category-chips{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:0 0 14px;display:grid}.category-chips button{overflow-wrap:anywhere;color:#42596d;background:#f7f9fb;border:1px solid #d8e3ec;border-radius:4px;min-width:0;min-height:38px;padding:7px 5px;font-size:12px;line-height:1.25}.category-chips button.active{border-color:var(--primary);color:var(--primary-dark);background:#e8f2fb;font-weight:600}.category-results{scroll-margin-top:calc(118px + env(safe-area-inset-top));padding:20px 16px 28px}.course-result{grid-template-columns:88px minmax(0,1fr) auto}.course-result>img,.course-result>.image-fallback{width:88px;height:62px}.inline-status,.status-view,.empty-state{min-height:112px;color:var(--muted);text-align:center;justify-content:center;align-items:center;gap:9px;font-size:13px;display:flex}.status-view,.empty-state{flex-direction:column;padding:30px 16px}.status-view b,.empty-state b{color:var(--ink);font-size:15px}.status-view p,.empty-state p{margin:-2px 0 0;line-height:1.55}.spinner{border:2px solid #c9d7e2;border-top-color:var(--primary);border-radius:50%;width:18px;height:18px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.segmented-control{border:1px solid var(--line);border-radius:var(--radius);background:#f3f6f8;grid-template-columns:repeat(3,1fr);gap:3px;margin:16px;padding:3px;display:grid}.segmented-control button{min-height:38px;color:var(--muted);background:0 0;border:0;border-radius:4px;font-size:13px;font-weight:600}.segmented-control button.active{color:var(--primary);background:#fff;box-shadow:0 1px 2px #172b3f14}.information-list{padding:0 16px 24px}.information-item{border-bottom:1px solid var(--line);grid-template-columns:116px minmax(0,1fr);gap:12px;padding:14px 0;display:grid}.information-item>img,.information-item>.image-fallback{object-fit:cover;border-radius:4px;width:116px;height:88px}.information-item>div:last-child{min-width:0}.information-item small{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;align-items:center;gap:6px;font-size:10px;display:flex;overflow:hidden}.information-item small span{color:#08766f;background:#e6f3f2;border-radius:3px;padding:3px 5px;font-weight:600}.information-item h2{color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:7px 0 0;font-size:15px;font-weight:600;line-height:1.42;display:-webkit-box;overflow:hidden}.information-item p{display:none}.information-item>div>b{color:var(--primary);align-items:center;gap:3px;margin-top:9px;font-size:11px;font-weight:600;display:inline-flex}.profile-page{background:var(--soft);padding:0 16px 28px}.account-empty{text-align:center;flex-direction:column;align-items:center;min-height:calc(100dvh - 126px);padding:72px 22px 40px;display:flex}.account-icon{width:64px;height:64px;color:var(--primary);background:#eaf3fb;border:1px solid #cbdde9;border-radius:50%;place-items:center;margin-bottom:18px;display:grid}.account-empty h1{margin:0;font-size:24px;font-weight:700}.account-empty p{max-width:320px;color:var(--muted);margin:10px 0 22px;font-size:14px;line-height:1.65}.profile-summary{border-bottom:1px solid var(--line);background:#fff;align-items:center;gap:14px;margin:0 -16px 12px;padding:24px 16px;display:flex}.avatar{background:var(--primary);cursor:pointer;border:2px solid #fff;border-radius:50%;flex:none;width:62px;height:62px;position:relative;overflow:hidden;box-shadow:0 0 0 1px #cbd9e5}.avatar img,.avatar>span{width:100%;height:100%}.avatar img{object-fit:cover}.avatar>span{color:#fff;place-items:center;font-size:24px;font-weight:700;display:grid}.avatar input{display:none}.profile-summary>div{min-width:0}.profile-summary h1{text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:21px;font-weight:700;overflow:hidden}.profile-summary p{color:var(--muted);margin:6px 0 0;font-size:12px}.form-section{border:1px solid var(--line);border-radius:var(--radius);background:#fff;margin-bottom:12px;padding:18px 14px}.form-section>header{border-bottom:1px solid var(--line);margin-bottom:15px;padding-bottom:12px}.form-section header h2{margin:0;font-size:17px;font-weight:700}.form-section header h2 small{color:var(--muted);font-size:11px;font-weight:400}.form-section header p{color:var(--muted);margin:5px 0 0;font-size:12px;line-height:1.5}.form-section>label,.form-grid label,.login-sheet>label{color:#344b5f;gap:6px;margin-bottom:13px;font-size:12px;font-weight:600;display:grid}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}input,select,textarea{width:100%;min-width:0;color:var(--ink);background:#fff;border:1px solid #cfdbe5;border-radius:4px;outline:0;font-size:14px}input,select{height:44px;padding:0 11px}textarea{resize:vertical;min-height:84px;padding:10px 11px}input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0b5cab17}.primary,.secondary,.danger,.logout{border-radius:var(--radius);justify-content:center;align-items:center;gap:6px;min-height:44px;padding:0 16px;font-size:14px;font-weight:600;display:inline-flex}.primary{border:1px solid var(--primary);background:var(--primary);color:#fff}.primary:active{background:var(--primary-dark)}.secondary{color:var(--primary);background:#fff;border:1px solid #cbd9e5}.danger{color:var(--danger);background:#fff4f5;border:1px solid #efd0d4}button:disabled{cursor:not-allowed;opacity:.55}.block{width:100%}.unbind-row{grid-template-columns:minmax(0,1fr) auto;gap:8px;display:grid}.unbind-row .danger{grid-column:1/-1}.upload-control input{display:none}.upload-control span{min-height:48px;color:var(--primary);background:#f5f9fc;border:1px dashed #abc2d4;border-radius:4px;justify-content:center;align-items:center;gap:7px;display:flex}.material-list{flex-wrap:wrap;gap:7px;margin:-3px 0 13px;display:flex}.material-list>span{border:1px solid var(--line);min-height:32px;color:var(--muted);border-radius:4px;align-items:center;gap:6px;padding:0 4px 0 9px;font-size:11px;display:inline-flex}.material-list button{width:28px;height:28px;color:var(--danger);background:0 0;border:0;place-items:center;padding:0;display:grid}.consent{align-items:flex-start;line-height:1.55;color:var(--muted)!important;grid-template-columns:none!important;gap:8px!important;font-size:11px!important;font-weight:400!important;display:flex!important}.consent input{width:16px;height:16px;box-shadow:none;accent-color:var(--primary);flex:none;margin:1px 0 0}.consent a{color:var(--primary)}.logout{color:#617384;background:#fff;border:1px solid #d7e0e7;width:100%}.tabbar{z-index:40;height:calc(62px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);border-top:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff7;grid-template-columns:repeat(4,1fr);display:grid;position:fixed;bottom:0;left:max(0px,50vw - 260px);right:max(0px,50vw - 260px);box-shadow:0 -2px 8px #172b3f0d}.tabbar button{color:#778a9b;background:0 0;border:0;flex-direction:column;justify-content:center;align-items:center;gap:3px;font-size:10px;display:flex;position:relative}.tabbar button.active{color:var(--primary);font-weight:600}.tabbar button.active:before{background:var(--primary);content:"";border-radius:0 0 2px 2px;width:24px;height:2px;position:absolute;top:0}.sheet-mask{z-index:80;background:#0b1c2d80;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.login-sheet{width:min(100%,520px);max-height:92dvh;padding:25px 20px calc(22px + env(safe-area-inset-bottom));background:#fff;border-radius:8px 8px 0 0;position:relative;overflow-y:auto}.sheet-close{color:#53697c;background:#f1f5f8;border:0;border-radius:50%;place-items:center;width:36px;height:36px;padding:0;display:grid;position:absolute;top:14px;right:14px}.login-sheet h2{margin:0;padding-right:40px;font-size:23px;font-weight:700}.login-sheet>p{color:var(--muted);margin:8px 0 20px;font-size:13px;line-height:1.55}.code-row{grid-template-columns:minmax(0,1fr) 112px;gap:8px;display:grid}.code-row button{color:var(--primary);background:#fff;border:1px solid #cbd9e5;border-radius:4px;font-size:13px;font-weight:600}.toast{z-index:100;left:50%;bottom:calc(82px + env(safe-area-inset-bottom));border-radius:var(--radius);color:#fff;text-align:center;background:#142738f0;max-width:calc(100vw - 40px);padding:10px 14px;font-size:13px;line-height:1.4;position:fixed;transform:translate(-50%)}.wechat-confirm-page{background:#f0f5f8;place-items:center;min-height:100dvh;padding:22px;display:grid}.wechat-confirm-card{border:1px solid var(--line);border-radius:var(--radius);text-align:center;background:#fff;width:min(100%,390px);padding:28px 22px}.wechat-confirm-brand{justify-content:center;align-items:center;gap:8px;margin-bottom:28px;display:flex}.wechat-confirm-brand img{border-radius:var(--radius);width:32px;height:32px}.wechat-confirm-brand b{font-size:18px;font-weight:700}.confirm-status-icon{width:62px;height:62px;color:var(--primary);background:#e9f2fa;border-radius:50%;place-items:center;margin:0 auto 18px;display:grid}.confirm-status-icon.success{color:var(--teal);background:#e7f4f1}.confirm-status-icon.error{color:var(--danger);background:#fff0f2}.wechat-confirm-card h1{margin:0;font-size:22px;font-weight:700}.wechat-confirm-card p{color:var(--muted);margin:10px 0 22px;font-size:14px;line-height:1.6}.wechat-confirm-card .secondary{margin-top:9px}.ai-page{background:var(--soft);padding-bottom:20px}.ai-intro{background:#edf5fb;border-bottom:1px solid #d8e5ef;padding:24px 16px 20px}.ai-intro>div>small{color:var(--teal);margin-bottom:5px;font-size:11px;font-weight:700;display:block}.ai-intro h1{margin:0;font-size:24px;font-weight:700;line-height:1.25}.ai-intro p{color:var(--muted);margin:8px 0 18px;font-size:13px;line-height:1.6}.ai-intro dl{gap:24px;margin:0;display:flex}.ai-intro dl div{align-items:baseline;gap:6px;display:flex}.ai-intro dt{color:var(--primary);font-size:21px;font-weight:700}.ai-intro dd{color:var(--muted);margin:0;font-size:11px}.ai-section{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;margin-top:8px;padding:20px 16px}.ai-section-heading{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.ai-section-heading>div{align-items:flex-start;gap:9px;min-width:0;display:flex}.ai-section-heading>div>svg{color:var(--primary);flex:none;margin-top:2px}.ai-section-heading h2{margin:0;font-size:18px;font-weight:700;line-height:1.3}.ai-section-heading p{color:var(--muted);margin:3px 0 0;font-size:11px;line-height:1.4}.ai-section-heading>small,.ai-section-heading>a{color:var(--primary);flex:none;align-items:center;gap:3px;font-size:12px;font-weight:600;display:inline-flex}.ai-assistant-grid{gap:10px;display:grid}.ai-assistant-item{border:1px solid var(--line);border-left:3px solid var(--primary);border-radius:var(--radius);background:#fff;padding:14px}.ai-assistant-item.tone-1{border-left-color:var(--teal)}.ai-assistant-item.tone-2{border-left-color:#386f8c}.ai-assistant-item.tone-3{border-left-color:#4b8063}.ai-assistant-item>header{grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:10px;display:grid}.ai-assistant-item header img{object-fit:cover;border-radius:5px;width:44px;height:44px}.ai-assistant-item header div{min-width:0}.ai-assistant-item h3{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:15px;font-weight:700;overflow:hidden}.ai-assistant-item header p{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin:4px 0 0;font-size:11px;overflow:hidden}.ai-assistant-item header>span{color:var(--primary);background:#e8f2fb;border-radius:3px;padding:4px 6px;font-size:10px;font-weight:600}.ai-assistant-item>p{color:#52697c;margin:11px 0 0;font-size:12px;line-height:1.55}.ai-tags{flex-wrap:wrap;gap:5px;margin-top:10px;display:flex}.ai-tags span{color:#607486;background:#f0f4f7;border-radius:3px;padding:4px 6px;font-size:10px}.ai-assistant-item footer{border-top:1px solid #e8eef3;justify-content:space-between;align-items:center;margin-top:12px;padding-top:10px;display:flex}.ai-assistant-item footer small{color:var(--muted);font-size:10px}.ai-assistant-item footer b{color:var(--primary);align-items:center;gap:3px;font-size:11px;font-weight:600;display:inline-flex}.ai-feature-banner{aspect-ratio:16/8;border-radius:var(--radius);touch-action:pan-y;-webkit-user-select:none;user-select:none;background:#dce8f2;margin-bottom:14px;display:block;position:relative;overflow:hidden}.ai-feature-banner>img{object-fit:cover;width:100%;height:100%}.ai-feature-banner>span{color:#fff;background:#081c2d75;flex-direction:column;justify-content:flex-end;padding:14px;display:flex;position:absolute;inset:0}.ai-feature-banner>span small,.ai-feature-banner>span b{align-items:center;gap:4px;font-size:10px;display:inline-flex}.ai-feature-banner h3{margin:6px 0 0;font-size:17px;font-weight:700;line-height:1.35}.ai-feature-banner p{text-overflow:ellipsis;white-space:nowrap;margin:4px 0 0;font-size:11px;overflow:hidden}.ai-feature-banner>span b{margin-top:9px;font-weight:600}.ai-news-list{border-top:1px solid var(--line)}.ai-news-list>a{border-bottom:1px solid var(--line);grid-template-columns:70px minmax(0,1fr) auto auto;align-items:center;gap:9px;min-height:82px;padding:10px 0;display:grid}.ai-news-list img,.ai-news-list .image-fallback{object-fit:cover;border-radius:4px;width:70px;height:54px}.ai-news-list>a>span{min-width:0}.ai-news-list h3{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:13px;font-weight:600;overflow:hidden}.ai-news-list p{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin:5px 0 0;font-size:11px;overflow:hidden}.ai-news-list time{color:var(--muted);font-size:10px}.ai-news-list>a>svg{color:#8ba0b3}.ai-guidance{gap:8px;margin-top:8px;display:grid}.ai-guidance article{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;padding:18px 16px}.ai-guidance header{align-items:flex-start;gap:9px;display:flex}.ai-guidance header>svg{color:var(--teal)}.ai-guidance header small{color:var(--teal);font-size:10px;font-weight:700}.ai-guidance h2{margin:2px 0 0;font-size:17px;font-weight:700}.ai-guidance ul{gap:9px;margin:14px 0 0;padding:0;list-style:none;display:grid}.ai-guidance li{color:#52697c;align-items:flex-start;gap:8px;font-size:12px;line-height:1.5;display:flex}.ai-guidance li svg{color:var(--teal);flex:none;margin-top:1px}.ai-notice p{color:#52697c;margin:13px 0;font-size:12px;line-height:1.65}.ai-notice>a{color:var(--primary);align-items:center;gap:4px;font-size:12px;font-weight:600;display:inline-flex}.course-detail-page{background:var(--soft);width:100%;max-width:520px;min-height:100dvh;margin:0 auto}.course-detail-head{z-index:30;height:calc(58px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 12px 0;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffff7;grid-template-columns:38px minmax(0,1fr) 38px;align-items:center;gap:9px;display:grid;position:sticky;top:0}.course-detail-head>button:first-child{width:38px;height:38px;color:var(--ink);background:#f1f5f8;border:0;border-radius:50%;place-items:center;padding:0;display:grid}.course-detail-head .brand{justify-self:start}.course-detail-status{min-height:calc(100dvh - 58px);color:var(--muted);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:40px 24px;display:flex}.course-detail-status>svg{color:var(--primary);margin-bottom:12px}.course-detail-status b{color:var(--ink);font-size:17px}.course-detail-status p{margin:8px 0 18px;font-size:13px;line-height:1.6}.course-detail-hero{background:#fff}.course-detail-hero>figure{aspect-ratio:16/9;background:#dce8f2;margin:0;position:relative;overflow:hidden}.course-detail-hero figure>img,.course-detail-hero figure>.image-fallback{object-fit:cover;width:100%;height:100%}.course-detail-hero figure>span{color:#fff;background:#091f32d1;border-radius:4px;padding:5px 8px;font-size:11px;font-weight:600;position:absolute;bottom:12px;left:12px}.course-detail-hero>div{padding:18px 16px 20px}.course-detail-hero>div>small,.course-description header small,.course-chapters>header small,.lesson-player header small{color:var(--teal);margin-bottom:5px;font-size:10px;font-weight:700;display:block}.course-detail-hero h1{color:var(--ink);margin:0;font-size:23px;font-weight:700;line-height:1.4}.course-detail-hero>div>p{color:var(--muted);margin:9px 0 0;font-size:13px;line-height:1.65}.course-detail-hero dl{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:repeat(3,minmax(0,1fr));margin:18px 0 0;padding:12px 0;display:grid}.course-detail-hero dl div{border-right:1px solid var(--line);text-align:center;min-width:0;padding:0 9px}.course-detail-hero dl div:last-child{border-right:0}.course-detail-hero dt{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:700;overflow:hidden}.course-detail-hero dd{color:var(--muted);margin:4px 0 0;font-size:10px}.course-detail-hero .course-teacher{color:#445d71;margin-top:12px;font-size:12px}.lesson-player,.course-description,.course-resource,.course-chapters{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;margin-top:8px;padding:18px 16px}.lesson-player>header{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px;display:flex}.lesson-player h2,.course-description h2,.course-chapters>header h2{margin:0;font-size:18px;font-weight:700;line-height:1.4}.lesson-player header button{background:#f0f4f7;border:0;border-radius:50%;flex:none;place-items:center;width:34px;height:34px;padding:0;display:grid}.lesson-player video{aspect-ratio:16/9;border-radius:var(--radius);background:#08131d;width:100%}.lesson-player>p{color:var(--muted);margin:12px 0 0;font-size:13px;line-height:1.7}.lesson-rich-text,.course-rich-text{overflow-wrap:anywhere;color:#344b5f;font-size:14px;line-height:1.75}.course-rich-text{margin-top:12px}.lesson-rich-text>:first-child,.course-rich-text>:first-child{margin-top:0}.lesson-rich-text>:last-child,.course-rich-text>:last-child{margin-bottom:0}.lesson-rich-text p,.course-rich-text p{margin:0 0 12px}.lesson-rich-text ul,.lesson-rich-text ol,.course-rich-text ul,.course-rich-text ol{margin:0 0 12px;padding-left:22px}.lesson-rich-text a,.course-rich-text a{color:var(--primary);text-underline-offset:2px;text-decoration:underline}.lesson-rich-text img,.lesson-rich-text video,.course-rich-text img,.course-rich-text video{border-radius:4px;max-width:100%;height:auto;margin:12px auto;display:block}.lesson-rich-text table,.course-rich-text table{border-collapse:collapse;max-width:100%;display:block;overflow-x:auto}.course-resource>a{grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;display:grid}.course-resource>a>svg{color:var(--primary)}.course-resource span b,.course-resource span small{display:block}.course-resource span b{font-size:14px;font-weight:600}.course-resource span small{color:var(--muted);margin-top:4px;font-size:11px}.course-chapters>header{border-bottom:1px solid var(--line);padding-bottom:13px;position:relative}.course-chapters>header p{color:var(--muted);margin:0;font-size:11px;position:absolute;bottom:15px;right:0}.course-chapters article{margin-top:16px}.course-chapters article>h3{color:var(--ink);align-items:center;gap:8px;margin:0 0 8px;font-size:14px;font-weight:700;display:flex}.course-chapters article>h3 span{color:var(--teal);font-size:11px}.course-chapters article>button{border:0;border-bottom:1px solid var(--line);text-align:left;background:#fff;grid-template-columns:76px minmax(0,1fr) auto;align-items:center;gap:10px;width:100%;min-height:72px;padding:9px 0;display:grid}.course-chapters article>button.active{background:#f2f7fb}.course-chapters button>img,.lesson-index{object-fit:cover;border-radius:4px;width:76px;height:52px}.lesson-index{color:var(--primary);background:#e8f1f8;place-items:center;font-weight:700;display:grid}.course-chapters button>div{min-width:0}.course-chapters button small,.course-chapters button b,.course-chapters button p{display:block}.course-chapters button small{color:var(--teal);margin-bottom:4px;font-size:10px}.course-chapters button b{color:var(--ink);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:13px;font-weight:600;line-height:1.45;display:-webkit-box;overflow:hidden}.course-chapters button p{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;margin:4px 0 0;font-size:10px;overflow:hidden}.course-chapters button>svg{color:var(--primary)}@media (width<=370px){.home-search h1,.page-intro h1{font-size:22px}.category-chips{grid-template-columns:repeat(2,minmax(0,1fr))}.information-item{grid-template-columns:96px minmax(0,1fr)}.information-item>img,.information-item>.image-fallback{width:96px;height:76px}.form-grid{grid-template-columns:1fr;gap:0}}@media (width>=521px){.mobile-shell{border-left:1px solid #d9e3ea;border-right:1px solid #d9e3ea}}
