* { box-sizing: border-box; }
html, body { margin: 0; background: #0A0A0A; color: #FFFFFF; font-family: 'Outfit', system-ui, sans-serif; }
a { color: #FF9C94; text-underline-offset: 3px; }
a:hover { color: #FFFFFF; }
.study-header { max-width: 1200px; margin: auto; padding: 24px; display: flex; align-items: center; gap: 24px; }
.study-header img { display: block; width: 96px; height: auto; }
.study-header nav { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-left: auto; }
.study-header nav a { display: inline-flex; align-items: center; min-height: 44px; color: #DDDDDD; text-decoration: none; }
.study-header nav a[aria-current] { color: #FFFFFF; text-decoration: underline; }
.study-cta { background: #FFFFFF; color: #111216; border-radius: 999px; padding: 12px 22px; text-decoration: none; }
.study-main { max-width: 880px; margin: auto; padding: 36px 24px 64px; }
.study-main h1 { font-family: 'Space Grotesk', sans-serif; font-weight: 500; line-height: 1.15; letter-spacing: -.025em; margin: 0 0 16px; }
.study-main h2 { font-family: 'Space Grotesk', sans-serif; font-size: 25px; line-height: 1.3; font-weight: 500; margin: 44px 0 16px; }
.study-main h3 { font-size: 19px; margin: 28px 0 12px; }
.study-main p { color: #CCCCCC; font-size: 17px; line-height: 1.75; margin: 0 0 20px; }
.study-main .lede { color: #EEEEEE; font-size: 21px; line-height: 1.6; }
.study-main .meta { font-size: 14px; margin-bottom: 24px; }
.study-main li { margin-bottom: 12px; }
.study-main .toc h2 { margin: 0; font-size: 19px; }
.study-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.study-card { display: flex; flex-direction: column; gap: 8px; border: 1px solid #383838; border-radius: 16px; background: #141414; padding: 22px; text-decoration: none; }
.study-card:hover { border-color: #FF9C94; }
.study-card strong { color: #FFFFFF; font-size: 20px; }
.study-card span { color: #BFBFBF; font-size: 16px; line-height: 1.6; }
.study-main table { width: 100%; border-collapse: collapse; font-size: 16px; line-height: 1.5; margin: 20px 0; }
.study-main caption { text-align: left; color: #BFBFBF; font-size: 14px; padding-bottom: 12px; }
.study-main th, .study-main td { padding: 14px 12px; text-align: left; border-bottom: 1px solid #383838; }
.study-main thead { background: #202020; }
.study-main tbody th { font-weight: 500; }
.study-main td { color: #CCCCCC; }
.study-main details { border: 1px solid #383838; border-radius: 14px; padding: 0 18px; margin: 20px 0; }
.study-main summary { cursor: pointer; color: #FF9C94; padding: 18px 0; font-size: 17px; }
.study-main details p { margin-top: 4px; }
.study-note { background: #171212; border-left: 3px solid #C42419; margin: 40px 0; padding: 24px; }
.study-note h2 { margin-top: 0; font-size: 21px; }
.study-note p { margin-bottom: 0; }
.study-related { border-top: 1px solid #383838; margin-top: 36px; }
.study-footer { border-top: 1px solid #303030; max-width: 1200px; margin: auto; padding: 28px 24px; display: flex; flex-wrap: wrap; gap: 16px 28px; }
.study-calculator { padding: 24px; border: 1px solid #484848; border-radius: 16px; background: #171717; }
.study-calculator label { display: block; margin: 0 0 8px; }
.study-calculator input, .study-calculator select { display: block; width: 100%; min-height: 48px; border: 1px solid #666666; background: #0A0A0A; color: #FFFFFF; padding: 12px; border-radius: 8px; font: inherit; font-size: 17px; margin-bottom: 20px; }
.study-calculator button { border: 0; background: #FFFFFF; color: #111216; border-radius: 999px; min-height: 48px; padding: 12px 24px; font: inherit; cursor: pointer; }
.study-calculator #grade-result { margin: 24px 0 0; color: #FFFFFF; min-height: 3em; }
@media (max-width: 650px) {
  .study-header { gap: 12px; }
  .study-header nav { order: 3; width: 100%; margin: 0; gap: 8px 20px; }
  .study-header > .study-cta { margin-left: auto; }
  .study-main { padding-top: 16px; }
  .study-grid { grid-template-columns: 1fr; }
  .study-main .lede { font-size: 19px; }
  .study-main h2 { font-size: 23px; }
  .study-main th, .study-main td { padding: 12px 7px; }
}