/* Expert Math Tutor — style option 3: "Blackboard" — version 2026-10-11 4:35 PM MDT
   A deep slate-green board with chalk formulas across the header, hero, page titles and footer; ivory paper below. */
body.theme-3{--ink:#1f3b34;--navy-deep:#14201c;--brass:#a9873a;--rule:#cfd9d3;--soft:#f2f1e8;--margin:#8a3b2d}
.theme-3 .top{background:#14201c;border-bottom:1px solid #2b423a}
.theme-3 .top::after{background:linear-gradient(to right,#f0dc9b 0,#f0dc9b 4.5rem,transparent 4.5rem)}
.theme-3 .brand,.theme-3 .brand-name{color:#f4efdd}
.theme-3 .brand-mark{background:#f6f1df url(../img/bell-mark.svg) center/82% no-repeat;border-radius:3px}
.theme-3 .nav a{color:#e4e1d0}
.theme-3 .nav a:hover{color:#fff;border-bottom-color:#f0dc9b}
.theme-3 .nav a[aria-current="page"]{color:#fff;border-bottom-color:#f0dc9b}
.theme-3 .nav a.btn{background:#f0dc9b;border-color:#f0dc9b;color:#14201c}
.theme-3 .nav a.btn:hover{background:#fff;border-color:#fff;color:#14201c}

.theme-3 .page-head{background:url(../img/bell-faint.svg) right bottom/min(44rem,62%) 6rem no-repeat,url(../img/wall-chalk.svg) 0 0/1380px 966px repeat,#1d2f2b;border-bottom:3px solid #f0dc9b}
.theme-3 .page-head h1{color:#f6f1df}
.theme-3 .page-head .lede{color:#d9d8c8}
.theme-3 .crumbs,.theme-3 .crumbs a{color:#b9c4bb}

.theme-3 .hero{background:url(../img/wall-chalk.svg) 0 0/1500px 1050px repeat,#1d2f2b;border-bottom:3px solid #f0dc9b}
.theme-3 .hero h1{color:#f6f1df}
.theme-3 .hero-grid > div:first-child p{color:#e4e2d3}
.theme-3 .hero-grid > div:first-child .lede{color:#efecdc}
.theme-3 .hero-grid > div:first-child .small{color:#b9c4bb}
.theme-3 .hero .btn{background:#f0dc9b;border-color:#f0dc9b;color:#14201c}
.theme-3 .hero .btn:hover{background:#fff;border-color:#fff;color:#14201c}
.theme-3 .hero .btn-ghost{background:transparent;color:#f6f1df;border-color:#f6f1df}
.theme-3 .hero .btn-ghost:hover{background:#f6f1df;color:#14201c}
.theme-3 .hero .pad{box-shadow:0 2px 0 #cdbf8d,0 20px 36px -14px rgba(0,0,0,.6)}

.theme-3 .foot{background:#14201c url(../img/wall-chalk.svg) 0 0/1380px 966px repeat;border-top:3px solid #f0dc9b}
.theme-3 .foot-in,.theme-3 .foot-fine{position:relative}
@media (max-width:52rem){.theme-3 .hero{background-size:1080px 756px}.theme-3 .page-head{background-size:90% 4rem,1080px 756px,auto}}

.theme-3 .hero-curve{--cv-ink:#f6f1df;--cv-muted:#c9cfc4;background:#1d2f2b;border-radius:4px;padding:1rem .6rem 0}
.theme-3 .cv-bg{stroke:#1d2f2b}
.theme-3 .cv-dot{fill:#f0dc9b;stroke:#1d2f2b}