/* SD Active class resources. Loads after /css/styles.css and reuses its tokens (navy, gold, paper, Anton, Geist). Square corners, flat blocks, hard shadows. */
.rs { --accent: var(--gold); --card: var(--navy-2); --edge: rgb(244 241 232 / .3); padding-bottom: 4rem; }
.rs .wrap-r { width: min(100% - 2rem, 1120px); margin-inline: auto; }
.rs h1 { font-size: clamp(3rem, 9vw, 6rem); margin-bottom: .25em; }
.rs h2 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 2.4rem 0 1rem; }
.rs section { margin-bottom: 1.5rem; scroll-margin-top: 140px; }
.rs .r-hero { padding: clamp(2rem, 5vw, 3.5rem) 0 1rem; max-width: 800px; }
.rs .lede { font-size: 1.2rem; color: var(--muted); max-width: 46ch; }
.rs .btns { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.4rem; }
.rs .note { border: 2px solid var(--gold); padding: 1rem 1.2rem; margin: 1.4rem 0; color: var(--paper); }
.rs .note strong { color: var(--gold); }
.rs .tools { position: sticky; top: 64px; z-index: 50; background: var(--navy); border-bottom: 2px solid var(--line); padding: .7rem 0; display: flex; gap: .5rem; align-items: center; overflow-x: auto; flex-wrap: nowrap; margin-bottom: .6rem; }
.rs .tools a { white-space: nowrap; border: 2px solid var(--line); color: var(--paper); text-decoration: none; padding: .4rem .8rem; font: 600 .8rem var(--mono); }
.rs .tools a:hover { color: var(--gold); border-color: var(--gold); }
.rs .tools input, .rs .tools select { background: var(--navy-2); color: var(--paper); border: 2px solid var(--paper); border-radius: 0; padding: .55rem .9rem; font: 500 .9rem var(--mono); flex: 1 1 220px; min-width: 170px; }
.rs .tools input::placeholder { color: var(--muted); }
.rs .tools select { flex: 0 1 auto; }
.rs .count { color: var(--muted); font: 500 .8rem var(--mono); white-space: nowrap; }
.rs .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 1rem; }
.rs .card { background: var(--card); border: 2px solid var(--edge); padding: 1rem 1.2rem; box-shadow: 4px 4px 0 #0a1a35; min-width: 0; }
.rs .card.wide { grid-column: 1 / -1; }
.rs .card h3 { font: 700 .74rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--gold); margin: 0 0 .7rem; }
.rs .eq { margin: 0 0 .6rem; color: var(--paper); font-size: .98rem; line-height: 1.5; overflow-x: auto; overflow-y: hidden; }
.rs .eq.txt { color: var(--muted); font-size: .92rem; }
.rs .scroll { overflow-x: auto; }
.rs table { border-collapse: collapse; min-width: 100%; font-size: .9rem; }
.rs th, .rs td { border-bottom: 1px solid var(--line); padding: .4rem .7rem; text-align: left; white-space: nowrap; color: var(--paper); }
.rs th { color: var(--gold); font-family: var(--mono); font-weight: 600; }
.rs .ucwrap { text-align: center; }
.rs .uc { width: min(460px, 100%); height: auto; color: var(--paper); margin-inline: auto; }
.rs .cap, .rs .cap2 { color: var(--muted); }
.rs .cap { font-size: .9rem; margin: .4rem 0 0; }
.rs .sheets { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: 1.2rem; }
.rs .sheets figure { margin: 0; background: var(--navy-2); border: 2px solid var(--edge); box-shadow: 4px 4px 0 #0a1a35; padding: .8rem; }
.rs .sheets img { width: 100%; height: auto; background: #fff; display: block; }
.rs .sheets figcaption { color: var(--muted); font-size: .9rem; margin-top: .7rem; display: flex; flex-direction: column; gap: .7rem; align-items: flex-start; }
.rs .dnav { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: .6rem; }
.rs .dnav a { border: 2px solid var(--line); padding: .3rem .7rem; font: 600 .78rem var(--mono); color: var(--paper); text-decoration: none; }
.rs .dnav a:hover { border-color: var(--gold); color: var(--gold); }
.rs h3.dept { font: 400 1.6rem/1 var(--display); text-transform: uppercase; color: var(--paper); margin: 1.6rem 0 .8rem; letter-spacing: .005em; scroll-margin-top: 140px; }
.rs .course h3 { font-size: .74rem; margin-bottom: .2rem; }
.rs .ctitle { font-weight: 600; color: var(--paper); margin-bottom: .4rem; }
.rs .topics { padding-left: 1.1rem; margin: 0 0 .6rem; }
.rs .topics li { color: var(--muted); font-size: .9rem; margin: 0 0 .15rem; }
.rs .chips { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .5rem; }
.rs .chip { font: 600 .7rem var(--mono); border: 1px solid var(--line); padding: .15rem .55rem; color: var(--gold); text-decoration: none; }
.rs .chip:hover { background: var(--gold); color: var(--ink); }
.rs .dept section { margin: 0; }
.rs .dept h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 2rem 0 .8rem; }
.rs .pfx { font: 500 .8rem var(--mono); color: var(--muted); margin-left: .5rem; }
.rs .dept ul { list-style: none; padding: 0; margin: 0; }
.rs .dept li { background: var(--card); border: 2px solid var(--edge); padding: .8rem 1rem; margin: 0 0 .6rem; }
.rs .r1 { color: var(--paper); font-weight: 600; } .rs .r1 b { color: var(--gold); font-family: var(--mono); margin-right: .3rem; }
.rs .u { color: var(--muted); font-size: .8rem; font-weight: 400; }
.rs .r2 { color: var(--muted); font-size: .92rem; margin-top: .15rem; }
.rs .r3 { color: var(--muted); font-size: .78rem; margin-top: .15rem; opacity: .85; }
.rs .misc summary { cursor: pointer; color: var(--gold); font: 600 .85rem var(--mono); margin: .4rem 0 .7rem; }
.rs .hide { display: none !important; }
.rs .flash { outline: 3px solid var(--gold); outline-offset: 2px; }
.rs .katex { font-size: 1.05em; }