:root { color-scheme: light; --ink: #153d42; --teal: #176a66; --paper: #f5f8f1; --line: #cbd9d0; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "Segoe UI", Arial, sans-serif; font-size: 18px; line-height: 1.6; }
a { color: var(--teal); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid #bd641b; outline-offset: 4px; }
.site-header { max-width: 1120px; margin: auto; padding: 26px 32px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.brand { font-weight: 750; text-decoration: none; font-size: 22px; }
nav { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
nav form { margin: 0; }
.link-button { font: inherit; color: var(--teal); cursor: pointer; background: none; border: none; padding: 0; text-decoration: underline; text-underline-offset: 4px; }
main { max-width: 1120px; padding: 28px 32px 64px; margin: auto; min-height: 72vh; }
.hero { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; padding: 24px 0 52px; }
.eyebrow { font-size: 14px; font-weight: 700; letter-spacing: .07em; color: var(--teal); }
h1 { font-size: clamp(32px, 4.5vw, 56px); line-height: 1.13; letter-spacing: -.035em; margin: 16px 0 24px; overflow-wrap: anywhere; }
h2 { font-size: 26px; line-height: 1.3; }
.intro { max-width: 570px; margin-bottom: 30px; }
.button { display: inline-block; background: var(--teal); color: white; padding: 12px 24px; border: 0; border-radius: 12px; text-decoration: none; font: inherit; font-weight: 600; cursor: pointer; }
.button:hover { background: #105550; }
.professor { background: #e2eee3; border-radius: 45% 45% 30% 30%; text-align: center; padding: 32px 8px; margin: 0; }
.professor img { display: block; max-width: 100%; height: auto; margin: auto; }
figcaption { font-size: 16px; }
.card { background: white; border: 1px solid var(--line); border-radius: 22px; padding: 36px; }
.course-preview { max-width: 760px; }
.form-card { max-width: 580px; margin: 20px auto; }
.form-card h1 { font-size: 36px; }
label { display: block; font-weight: 600; margin-bottom: 6px; }
input:not([type=hidden]) { display: block; width: 100%; border: 1px solid #8ba9a4; border-radius: 8px; padding: 12px; font: inherit; }
.helptext, .muted { display: block; color: #4d6666; font-size: 15px; }
.errorlist { color: #a12525; padding-left: 22px; }
.empty-state { background: #f1f6ef; border-radius: 12px; padding: 22px; margin: 28px 0; }
footer { border-top: 1px solid var(--line); padding: 24px; text-align: center; font-size: 15px; color: #4d6666; }
@media (max-width: 700px) { .site-header { align-items: flex-start; flex-direction: column; padding: 20px; } main { padding: 12px 20px 40px; } .hero { grid-template-columns: 1fr; gap: 28px; } .professor { max-width: 340px; justify-self: center; } .card { padding: 24px; } }