.page-width { width: min(1120px, calc(100% - 96px)); margin-inline: auto; }
.site-header { min-height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 20px max(48px, calc((100vw - 1320px)/2)); border-bottom: 1px solid var(--border); }
.site-header nav { display: flex; align-items: center; gap: 34px; font-size: 13px; }
.site-header nav a { display: inline-flex; min-height: 44px; align-items: center; text-decoration: none; transition: color .2s; }
.site-header nav a:hover { color: var(--accent); }
.nav-start { gap: 20px; color: var(--accent); border-bottom: 1px solid var(--accent); }
.hero { display: grid; grid-template-columns: 1.02fr 1fr; gap: 30px; padding-block: 76px 65px; align-items: center; }
.hero-copy { animation: arrive .6s ease-out both; }
.hero .eyebrow { display: flex; align-items: center; gap: 10px; color: var(--accent); margin: 0 0 35px; font-size: 10px; }
.hero-kicker { font-size: 13px; color: var(--faint); margin: 0 0 18px; letter-spacing: 2px; }
h1 { margin: 0 0 33px; font-size: clamp(48px, 5.3vw, 72px); line-height: 1.3; letter-spacing: -3px; font-weight: 800; }
.ink-highlight { color: var(--accent); position: relative; display: inline-block; isolation: isolate; }
.ink-highlight::before { content: ''; position: absolute; inset: 6% -5% -4% -3%; z-index: -1; background: #e9edf7; clip-path: polygon(1% 5%, 97% 0, 100% 94%, 2% 100%); transform: rotate(-1deg); }
.hero-lead { font-size: 16px; font-weight: 600; margin: 0 0 12px; line-height: 1.8; }
.hero-description { font-size: 13px; line-height: 2; color: var(--dim); margin: 0; max-width: 390px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 28px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 30px; padding: 16px 22px; font-size: 13px; text-decoration: none; transition: background-color .2s, transform .2s; }
.button-primary { color: #fff; background: var(--accent); border-radius: 2px 5px 3px 2px; transform: rotate(-1deg); }
.button-primary:hover { background: #294583; transform: rotate(0) translateY(-2px); }
.text-link { display: inline-flex; align-items: center; min-height: 48px; gap: 12px; font-size: 12px; color: var(--dim); text-decoration: none; }
.text-link:hover { color: var(--accent); }
.hero-meta { display: flex; gap: 17px; margin-top: 31px; font-size: 10px; color: var(--faint); }
.hero-meta span + span::before { content: '/'; margin-right: 17px; color: #aeb2bb; }
.hero-art { position: relative; margin: 0 -12px 0 0; animation: arrive .8s .1s ease-out both; }
.hero-art img { display: block; width: 100%; height: auto; transform: rotate(2deg); }
.paper-tape { position: absolute; z-index: 1; width: 118px; height: 30px; top: 1%; left: 37%; transform: rotate(-6deg); background: #e4e6dbb0; clip-path: polygon(2% 0, 100% 3%, 97% 100%, 0 92%); }
.hero-art figcaption { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 11px 28px 0; color: var(--faint); font-size: 10px; }
.hero-art figcaption span:first-child { font: italic 20px Georgia, serif; color: var(--accent); transform: rotate(-4deg); }
.section-index { border-block: 1px solid var(--border); display: flex; align-items: center; gap: 42px; min-height: 75px; font-size: 12px; }
.section-index a { display: flex; align-items: center; min-height: 44px; gap: 12px; text-decoration: none; }
.section-index a:hover { color: var(--accent); }
.section-index a span { font-family: var(--font-mono); font-size: 10px; color: var(--accent); }
.section-index p { margin-left: auto; color: var(--faint); font-size: 11px; }
.section-index p span { font-size: 20px; margin-left: 18px; color: var(--accent); }
.subjects { padding-block: 76px 82px; scroll-margin-top: 28px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 34px; }
.section-heading .eyebrow { margin: 0 0 15px; }
h2 { font-size: 30px; line-height: 1.5; letter-spacing: -1px; margin: 0; }
.section-heading > p { color: var(--faint); font-size: 12px; line-height: 1.9; margin: 0 0 4px; }
.mobile-break { display: none; }
.subject-feature { display: grid; grid-template-columns: .85fr 1.15fr; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; text-decoration: none; background: var(--panel); transition: border-color .2s, transform .2s; }
.subject-feature:hover { border-color: #a7b5d5; transform: translateY(-3px); }
.subject-art { position: relative; display: flex; align-items: center; justify-content: center; flex-direction: column; min-height: 306px; background: var(--accent-soft); color: var(--accent); background-image: linear-gradient(#3455a409 1px, transparent 1px), linear-gradient(90deg, #3455a409 1px, transparent 1px); background-size: 24px 24px; overflow: hidden; }
.subject-code { position: absolute; top: 22px; left: 26px; font: 9px var(--font-mono); letter-spacing: 2px; }
.subject-art svg { width: 82%; max-height: 226px; opacity: .8; transition: transform .4s; }
.subject-feature:hover .subject-art svg { transform: rotate(6deg); }
.formula { font: italic 17px Georgia, serif; }
.formula i { margin: 0 15px; }
.subject-content { padding: 30px 38px; }
.subject-topline { display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.availability { display: inline-flex; gap: 7px; align-items: center; font-size: 10px; color: var(--basic); }
.subject-content h3 { font-size: 31px; margin: 18px 0 10px; }
.subject-content p { font-size: 13px; color: var(--dim); line-height: 1.9; margin: 0; }
.topic-tags { display: flex; gap: 8px; margin-block: 19px 25px; }
.topic-tags span { font-size: 10px; background: #f2f3f5; padding: 5px 9px; color: var(--dim); }
.subject-bottom { display: flex; align-items: center; gap: 16px; justify-content: space-between; padding-top: 18px; border-top: 1px solid var(--border); font-size: 11px; color: var(--faint); }
.subject-bottom i { margin-inline: 8px; font-style: normal; }
.subject-bottom strong { color: var(--accent); font-weight: 500; white-space: nowrap; }
.subject-bottom strong span { margin-left: 18px; }
.upcoming-subjects { margin-top: 20px; }
.upcoming { display: flex; align-items: center; gap: 25px; padding: 25px 10px; border-bottom: 1px solid var(--border); }
.subject-number { color: #858b97; font: italic 23px Georgia, serif; }
.upcoming h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; }
.upcoming h3 span { color: var(--faint); font: 10px var(--font-mono); margin-left: 12px; letter-spacing: 1px; }
.upcoming p { color: var(--faint); font-size: 12px; line-height: 1.8; margin: 0; }
.coming-label { margin-left: auto; font-size: 10px; border: 1px solid var(--border); padding: 5px 10px; white-space: nowrap; color: var(--faint); }
.approach { border-block: 1px solid var(--border); background: #f3f4f0; padding-block: 70px; }
.approach-inner { display: grid; grid-template-columns: .8fr 1.4fr; gap: 70px; }
.approach-heading .eyebrow { margin: 0 0 22px; }
.approach h2 { font-size: 37px; }
.approach-heading > p:not(.eyebrow) { font-size: 12px; line-height: 2; color: var(--dim); margin: 20px 0 24px; }
.hand-note { display: inline-block; color: var(--accent); font: italic 19px Georgia, serif; transform: rotate(-5deg); }
.learning-steps { list-style: none; padding: 0; margin: 0; }
.learning-steps li { display: flex; align-items: start; gap: 23px; padding-block: 27px; border-bottom: 1px solid #d9ddd5; }
.learning-steps li:first-child { padding-top: 8px; }
.learning-steps li:last-child { border-bottom: 0; padding-bottom: 0; }
.step-number { color: var(--accent); font: italic 22px Georgia, serif; }
.learning-steps h3 { font-size: 17px; margin: 0 0 12px; font-weight: 600; }
.learning-steps p { font-size: 12px; line-height: 1.9; color: var(--dim); margin: 0; }
.step-label { font-size: 10px; color: var(--faint); white-space: nowrap; writing-mode: vertical-rl; letter-spacing: 3px; padding-top: 2px; margin-left: 8px; }
.site-footer { display: flex; justify-content: space-between; gap: 25px; align-items: center; padding-block: 40px; }
.footer-title { font-size: 15px; text-decoration: none; font-weight: 600; }
.footer-title span { margin-left: 18px; color: var(--accent); }
.site-footer p { margin: 9px 0 0; font-size: 10px; color: var(--faint); line-height: 1.9; }
.footer-right { font-size: 10px; color: var(--faint); text-align: right; }
.footer-right p { margin: 0 0 10px; }
.footer-right a { display: inline-flex; align-items: center; min-height: 44px; color: var(--accent); text-decoration: none; margin-right: 18px; }
@keyframes arrive { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@media (min-width: 1500px) { .hero { padding-block: 96px 85px; } }
@media (max-width: 900px) {
  .page-width { width: calc(100% - 56px); }
  .site-header { padding-inline: 28px; }
  .site-header nav { gap: 24px; }
  .hero { gap: 10px; padding-block: 60px; }
  .hero .eyebrow { font-size: 8px; letter-spacing: 1px; }
  .hero-art figcaption { margin-inline: 12px; }
  .hero-art figcaption span:first-child { font-size: 17px; }
  .hero-art figcaption span:last-child { display: none; }
  .hero-meta { gap: 10px; font-size: 9px; }
  .hero-meta span + span::before { margin-right: 10px; }
  .section-heading > p { max-width: 170px; }
  .subject-content { padding: 26px; }
  .approach-inner { gap: 40px; }
}
@media (max-width: 620px) {
  .page-width { width: calc(100% - 40px); }
  .site-header { min-height: 76px; padding: 14px 20px; gap: 12px; }
  .brand { font-size: 15px; gap: 10px; }
  .brand small { font-size: 9px; }
  .brand-mark { font-size: 33px; width: 40px; }
  .site-header .nav-link { display: none; }
  .site-header nav { font-size: 11px; }
  .nav-start { gap: 12px; }
  .hero { grid-template-columns: 1fr; padding-block: 45px 34px; gap: 34px; }
  .hero .eyebrow { font-size: 9px; letter-spacing: 1.3px; margin-bottom: 25px; }
  .hero-kicker { font-size: 12px; margin-bottom: 13px; }
  h1 { font-size: clamp(48px, 13vw, 68px); margin-bottom: 27px; letter-spacing: -2px; }
  .hero-lead { font-size: 14px; }
  .hero-description { font-size: 12px; }
  .hero-actions { gap: 20px; margin-top: 25px; }
  .hero-meta { font-size: 10px; margin-top: 25px; }
  .hero-art { margin: 0 auto; max-width: 400px; width: 94%; }
  .hero-art figcaption span:last-child { display: block; }
  .section-index { gap: 30px; min-height: 64px; }
  .section-index p { display: none; }
  .subjects { padding-block: 46px; }
  .section-heading { display: block; margin-bottom: 25px; }
  .section-heading > p { margin-top: 15px; max-width: none; }
  .section-heading > p br { display: none; }
  .eyebrow { font-size: 9px; }
  h2 { font-size: 25px; }
  .mobile-break { display: inline; }
  .subject-feature { grid-template-columns: 1fr; }
  .subject-art { min-height: 202px; }
  .subject-art svg { height: 155px; width: 70%; }
  .subject-code { top: 16px; left: 20px; }
  .formula { font-size: 14px; margin-bottom: 15px; }
  .subject-content { padding: 23px; }
  .subject-content h3 { font-size: 28px; }
  .subject-bottom { font-size: 10px; }
  .subject-bottom strong span { margin-left: 8px; }
  .upcoming { gap: 15px; padding: 22px 0; }
  .upcoming p { font-size: 11px; }
  .coming-label { padding: 4px 7px; font-size: 9px; }
  .approach { padding-block: 42px; }
  .approach-inner { grid-template-columns: 1fr; gap: 36px; }
  .approach h2 { font-size: 30px; }
  .approach h2 br { display: none; }
  .approach-heading > p:not(.eyebrow) br { display: none; }
  .approach-heading > p:not(.eyebrow) { margin-block: 13px 22px; }
  .learning-steps li { gap: 18px; }
  .site-footer { display: block; padding-block: 30px; }
  .footer-right { text-align: left; margin-top: 22px; }
}