@font-face{font-family:Bloom;src:url('fonts/inter.ttf') format('truetype');font-display:swap;font-weight:100 900}
:root{--bloom-navy:#0d214d;--bloom-blue:#438cdc;--bloom-gold:#cba33c;--bloom-muted:#637b97}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body.bloom-home{margin:0;background:#fff;color:var(--bloom-navy);font-family:Bloom,"Segoe UI","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,summary,a,input{touch-action:manipulation}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #e0b754;outline-offset:5px}p{line-height:1.8}h1,h2,h3,p{margin-top:0}.bloom-wrap,.bloom-home .site-wrap{width:calc(100% - 64px);max-width:1120px;margin:0 auto}
.bloom-home .site-header{background:#fff}.bloom-home .site-nav{min-height:88px;gap:22px}.bloom-home .site-brand{display:flex;align-items:center;gap:11px}.bloom-home .site-brand strong{display:block;font-size:22px;letter-spacing:-.6px;white-space:nowrap}.bloom-home .site-brand small{display:block;font-size:10px;margin-top:4px;color:#637b97}.bloom-home .site-logo{display:grid;place-items:center;width:44px;height:44px;border:1px solid #0d214d;border-radius:50%;font:34px Georgia,serif;flex-shrink:0}.bloom-home .platform-program-menu{display:none}.bloom-home .site-notice{min-height:36px;font-size:12px}.bloom-home .site-plan-link{color:#fff}
.bloom-night{background:linear-gradient(135deg,#081a3c,#102654);color:#fff}.bloom-hero{padding:102px 0 0;text-align:center}.bloom-hero h1{font-size:clamp(35px,4.25vw,58px);font-weight:750;line-height:1.32;letter-spacing:-1.5px;margin:0 0 32px}.bloom-highlight{color:#559ee9;position:relative;white-space:nowrap}.bloom-highlight:after{content:"";position:absolute;height:4px;background:#559ee9;bottom:-7px;left:-3%;width:106%;border-radius:100%;transform:rotate(-2deg)}.bloom-hero>p{font-size:18px;color:#d5e2f3;margin-bottom:1px}.bloom-hero .hero-description{margin-bottom:30px}.bloom-actions{display:flex;justify-content:center;gap:16px;margin:0 0 61px}.bloom-button{display:inline-flex;align-items:center;justify-content:center;gap:18px;border:1px solid var(--bloom-blue);background:var(--bloom-blue);color:#fff;min-height:46px;padding:12px 26px;border-radius:26px;font-size:13px;font-weight:650}.bloom-button:hover{background:#3178c7}.bloom-button.outline{border-color:#647b9f;background:transparent;color:#e5edfa}.bloom-button.outline:hover{background:#ffffff0d}
.bloom-proof{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;padding:24px;background:#ffffff04;border:1px solid #ffffff06;border-radius:25px;text-align:left}.bloom-proof article{position:relative;background:#ffffff08;border:1px solid #ffffff14;border-radius:21px;padding:72px 20px 25px;min-height:219px}.proof-symbol{position:absolute;right:18px;top:18px;width:43px;height:43px;display:grid;place-items:center;border-radius:50%;color:white;font:25px Georgia,serif}.gold{background:#cba33c}.blue{background:#438cdc}.plum{background:#795077}.green{background:#51a087}.bloom-proof strong{display:block;font-size:31px;line-height:1.4;letter-spacing:-.8px;margin-bottom:9px}.bloom-proof h2{font-size:13px;line-height:1.6;margin-bottom:6px}.bloom-proof p{font-size:11px;color:#c3d4ec;margin:0}
.bloom-learning{padding:69px 0 72px}.bloom-section-title{text-align:center;margin-bottom:35px}.bloom-section-title h2{font-size:30px;letter-spacing:-.8px;line-height:1.5;margin-bottom:12px}.bloom-section-title p{font-size:15px;color:#637b97;margin:0}.learning-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px}.learning-grid article{padding:30px 25px;border:1px solid #dce7f1;border-radius:14px}.learning-icon{display:grid;place-items:center;width:45px;height:45px;border-radius:11px;font:25px Georgia,serif;color:white;margin-bottom:24px}.learning-grid h3{font-size:19px;line-height:1.5;margin-bottom:12px}.learning-grid p{font-size:13px;color:#637b97;margin-bottom:23px}.learning-grid a{font-size:12px;color:#3178c7}
.bloom-lab-section{background:#f0f6fb;padding:63px 0 70px}.bloom-lab{display:grid;grid-template-columns:minmax(0,1fr) 260px;background:#fff;border:1px solid #dce7f1;border-radius:16px;overflow:hidden}.lab-main{padding:28px 35px}.lab-heading{display:flex;justify-content:space-between;gap:16px;font-size:11px;color:#637b97;padding-bottom:16px;border-bottom:1px solid #e6edf5}.lab-question{font-size:17px;line-height:1.8;margin:20px 0 14px;color:#18345c}.lab-main svg{display:block;width:100%;height:auto;background:#f8fbfd;border-radius:10px;margin-bottom:24px}.chart-grid{fill:none;stroke:#e1eaf2;stroke-width:1}.chart-axis{stroke:#9aafc7;fill:none;stroke-width:1.2}.chart-label{font:13px Georgia,serif;fill:#6b819b}.chart-equation{font:22px Georgia,serif;fill:#438cdc}.lab-readout{display:flex;justify-content:space-between;gap:15px;font-size:13px;color:#637b97}.lab-readout strong{color:#18345c}.lab-main input{width:100%;accent-color:#438cdc;min-height:44px;margin:5px 0 0}.lab-instruction{font-size:11px;color:#637b97;margin:0}.lab-aside{background:#f7fafd;border-left:1px solid #e1eaf3;padding:35px 25px;display:flex;flex-direction:column;align-items:start}.lab-symbol{font:58px Georgia,serif;color:#85aedb;margin-bottom:25px}.lab-aside h3{font-size:19px;margin-bottom:13px}.lab-aside>p{font-size:13px;color:#637b97}.concept-solution{margin:15px 0 25px;width:100%;border-top:1px solid #dce7f1;padding-top:17px}.concept-solution summary{font-size:13px;font-weight:600;cursor:pointer;min-height:44px}.concept-solution p{font-size:12px;color:#637b97}.lab-aside a{color:#3178c7;font-size:12px;margin-top:auto}
.bloom-membership{background:#e6edf5;padding:42px 0}.bloom-membership>.bloom-wrap{display:flex;align-items:center;gap:27px}.membership-symbol{font:62px Georgia,serif;color:white;background:#0d214d;border-radius:15px;width:70px;height:81px;display:grid;place-items:center;flex-shrink:0;transform:rotate(-6deg)}.bloom-membership h2{font-size:25px;margin-bottom:8px;line-height:1.5;letter-spacing:-.5px}.bloom-membership p{font-size:13px;color:#637b97;margin:0}.bloom-membership a{margin-left:auto;flex-shrink:0}.form-message{font-size:13px;color:#ae2d40}.form-message:empty{display:none}.bloom-home .platform-footer .site-logo{width:40px;height:40px;font-size:31px}.bloom-home .platform-footer{padding-top:42px}
@media(max-width:1100px){.bloom-home .site-nav{gap:13px}.bloom-home .site-brand strong{font-size:20px}.bloom-hero{padding-top:75px}.bloom-proof{padding:18px;gap:12px}.bloom-proof article{padding:72px 15px 20px}.bloom-proof strong{font-size:25px}.bloom-lab{grid-template-columns:minmax(0,1fr) 230px}}
@media(max-width:760px){.bloom-wrap,.bloom-home .site-wrap{width:calc(100% - 32px)}.bloom-home .site-nav{min-height:76px;gap:8px}.bloom-home .site-brand strong{font-size:18px}.bloom-home .site-logo{width:35px;height:35px;font-size:28px}.bloom-home .site-notice{font-size:10px}.bloom-hero{padding-top:53px}.bloom-hero h1{font-size:clamp(29px,6.5vw,45px);letter-spacing:-1px;line-height:1.45;margin-bottom:26px}.bloom-hero>p{font-size:14px}.bloom-highlight:after{height:3px;bottom:-5px}.bloom-actions{gap:10px;margin-bottom:37px;margin-top:24px}.bloom-button{font-size:12px;padding:11px 20px;gap:12px}.bloom-proof{grid-template-columns:1fr 1fr;padding:13px;gap:11px;border-radius:18px}.bloom-proof article{min-height:179px;padding:60px 13px 18px;border-radius:13px}.proof-symbol{width:33px;height:33px;right:12px;top:12px;font-size:20px}.bloom-proof strong{font-size:23px;letter-spacing:-.8px}.bloom-proof h2{font-size:11px}.bloom-proof p{font-size:10px}.bloom-courses{padding-top:34px;padding-bottom:32px}.bloom-learning{padding:43px 0}.bloom-section-title h2{font-size:25px;letter-spacing:-.5px}.bloom-section-title p{font-size:13px}.bloom-section-title{margin-bottom:27px}.learning-grid{grid-template-columns:1fr;gap:17px}.learning-grid article{padding:25px}.learning-icon{margin-bottom:17px}.learning-grid p{margin-bottom:18px}.bloom-lab-section{padding:43px 0}.bloom-lab{grid-template-columns:1fr}.lab-main{padding:22px 19px}.lab-heading{font-size:10px;flex-wrap:wrap}.lab-question{font-size:15px}.lab-readout{font-size:12px}.lab-aside{border-left:0;border-top:1px solid #e1eaf3;padding:25px}.lab-symbol{display:none}.concept-solution{margin-bottom:16px}.bloom-membership{padding:30px 0}.bloom-membership>.bloom-wrap{flex-wrap:wrap;gap:17px}.membership-symbol{width:48px;height:57px;font-size:43px}.bloom-membership>.bloom-wrap>div{flex:1;min-width:210px}.bloom-membership h2{font-size:21px}.bloom-membership p{font-size:12px}.bloom-membership a{margin-left:0}.bloom-home .platform-footer-legal{font-size:11px}.bloom-home .platform-footer-grid{gap:25px}.bloom-home .platform-footer-grid nav a{line-height:1.7}.bloom-home .platform-footer .site-brand small{display:block}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* AP-focused positioning, preserving the accepted reading style. */
[hidden]{display:none!important}
.bloom-hero{padding-top:86px}
.bloom-hero h1{max-width:1050px;margin:0 auto 32px;font-family:Manrope,Inter,sans-serif;font-size:clamp(36px,4.5vw,64px);font-weight:800;line-height:1.2;letter-spacing:-.04em}
.bloom-highlight{display:inline-block;white-space:normal}
.bloom-highlight:after{height:4px;left:8%;width:84%;bottom:-10px;transform:rotate(-1deg)}
.bloom-hero .hero-description{max-width:780px;margin:0 auto 32px;font-size:18px;line-height:1.8;color:#d5e2f3}
.bloom-actions{margin-bottom:48px}
.bloom-button{font-size:14px;min-height:48px;padding:12px 28px}
.bloom-proof{gap:16px;padding:24px}
.bloom-proof article{padding:76px 23px 27px;min-height:246px}
.bloom-proof strong{font-family:Manrope,Inter,sans-serif;font-size:29px;font-weight:800;line-height:1.3;letter-spacing:-.035em;margin-bottom:13px}
.bloom-proof h2{font-size:15px;line-height:1.55;margin-bottom:10px;font-weight:650}
.bloom-proof p{font-size:14px;line-height:1.7;color:#cfdef1}

.learning-grid h3{font-size:21px;line-height:1.4}
.learning-grid p{font-size:14px;line-height:1.8}
.learning-grid a{display:inline-flex;align-items:center;min-height:44px;font-size:14px;font-weight:600}
@media(max-width:1100px){.bloom-hero{padding-top:70px}.bloom-proof{padding:18px;gap:12px}.bloom-proof article{padding:73px 18px 23px}.bloom-proof strong{font-size:25px}.bloom-proof h2{font-size:14px}.bloom-proof p{font-size:13px}}
@media(max-width:760px){.bloom-hero{padding-top:48px}.bloom-hero h1{font-size:clamp(30px,8.3vw,40px);line-height:1.23;margin-bottom:28px;letter-spacing:-.035em}.bloom-hero .hero-description{font-size:15px;line-height:1.75;margin-bottom:28px}.bloom-actions{flex-wrap:wrap;gap:12px;margin-top:0;margin-bottom:34px}.bloom-button{font-size:13px;padding:12px 21px}.bloom-proof{padding:12px;gap:10px}.bloom-proof article{min-height:234px;padding:60px 14px 21px}.bloom-proof strong{font-size:23px;margin-bottom:12px}.bloom-proof h2{font-size:13px;line-height:1.5}.bloom-proof p{font-size:13px;line-height:1.6}.ap-course-heading{margin-bottom:23px}.ap-course-heading h2{font-size:25px}.ap-course-heading p{font-size:13px}.learning-grid p{font-size:14px}.learning-grid h3{font-size:21px}}


/* A concise subject directory, with course choice carrying the layout. */
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.bloom-courses{padding:52px 0 64px;scroll-margin-top:25px}
.course-directory{border-radius:18px;overflow:hidden}
.ap-subject-group{background:#4b96d0;color:#fff}
.ap-subject-group.physics{background:#30486f}
.ap-subject-group summary{display:flex;align-items:center;gap:17px;min-height:88px;padding:23px 31px;cursor:pointer;list-style:none}
.ap-subject-group summary::-webkit-details-marker{display:none}
.ap-subject-group summary:focus-visible{outline:3px solid #f1d078;outline-offset:-6px;border-radius:12px}
.ap-subject-group summary h2{font-size:24px;font-weight:750;line-height:1.4;letter-spacing:-.035em;margin:0}
.subject-chevron{display:grid;place-items:center;width:29px;height:29px;background:#ffffff20;border-radius:50%;flex-shrink:0}
.subject-chevron svg{width:21px;height:21px;stroke:#fff;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.ap-subject-group:not([open]) .subject-chevron svg{transform:rotate(180deg)}
.subject-icons{margin-left:auto;display:flex;align-items:center;gap:10px}
.subject-icons>span{display:grid;place-items:center;width:42px;height:42px;background:#0d214d20;border-radius:8px;font:28px Georgia,serif}
.subject-status{font-size:12px;border:1px solid #ffffff35;border-radius:6px;padding:5px 10px;color:#e3edf9;margin-left:4px}
.subject-content{display:grid;grid-template-columns:repeat(2,minmax(0,280px)) minmax(0,1fr);gap:24px;padding:4px 31px 34px;align-items:start}
.course-tile{min-width:0;border-radius:12px;background:white;color:#142d54;overflow:hidden}
.course-tile-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:22px 20px 18px;min-height:83px}
.course-tile-heading h3{font-size:21px;line-height:1.35;font-weight:750;letter-spacing:-.025em;margin:0}
.tile-icon{display:grid;place-items:center;width:36px;height:36px;border-radius:7px;background:#edf5fc;color:#337bb7;font:29px Georgia,serif;flex-shrink:0}
.course-row{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:54px;padding:14px 20px;border-top:1px solid #e8eff6;font-size:14px;line-height:1.5;font-weight:500;scroll-margin-top:30px}
.course-row svg{width:17px;height:17px;flex-shrink:0;fill:none;stroke:#7896b8;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
a.course-row:hover{background:#eef6fd;color:#246ba8}
a.course-row:focus-visible{outline:3px solid #b68a20;outline-offset:-4px;background:#eef6fd}
.course-pick{padding:15px 0 0 23px;color:#112f57}
.course-pick span{display:block;font-family:Manrope,Inter,sans-serif;font-size:28px;font-weight:750;font-style:italic;line-height:1.3;letter-spacing:-.04em;transform:rotate(-6deg)}
.course-pick svg{display:block;width:144px;height:90px;margin:7px 0 0 -19px;fill:none;stroke:#112f57;stroke-width:2.8;stroke-linecap:round;stroke-linejoin:round}
.unavailable{color:#59718e;font-size:13px}
.course-state{font-size:11px;color:#526a84;background:#f0f4f8;padding:4px 7px;border-radius:5px;flex-shrink:0}
@media(max-width:1100px){.subject-content{grid-template-columns:repeat(2,minmax(0,260px)) minmax(0,1fr);gap:20px}.course-pick{padding-left:8px}.course-pick span{font-size:25px}.course-pick svg{width:120px}}
@media(max-width:860px){.subject-content{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.course-pick{display:none}.ap-subject-group summary{padding:22px 25px}.subject-content{padding:2px 25px 27px}}
@media(max-width:760px){.bloom-courses{padding:34px 0 42px}.course-directory{border-radius:14px}.ap-subject-group summary{min-height:79px;gap:11px;padding:20px 18px}.ap-subject-group summary h2{font-size:21px}.subject-chevron{width:25px;height:25px}.subject-icons{gap:7px}.subject-icons>span{width:31px;height:33px;font-size:23px}.subject-status{font-size:10px;padding:4px 6px;margin-left:0}.subject-content{padding:0 18px 24px;gap:14px}.course-tile-heading{padding:19px 17px 16px;min-height:77px}.course-tile-heading h3{font-size:20px}.course-row{padding:14px 17px;min-height:53px;font-size:14px}.tile-icon{width:31px;height:31px;font-size:25px}.unavailable{font-size:13px}}
@media(max-width:580px){.subject-content{grid-template-columns:1fr}.course-tile-heading{min-height:70px}.subject-icons>span{width:28px;height:31px}.ap-subject-group.physics .subject-icons>span:last-child{display:none}}