:root {
    color-scheme: light;
    font-family: Arial, Helvetica, sans-serif;
    --ink: #17211e;
    --muted: #5e6b67;
    --line: #d7dedb;
    --paper: #ffffff;
    --ground: #f2f5f4;
    --brand: #086a57;
    --brand-dark: #075144;
    --danger: #a52f2f;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--ground); color: var(--ink); }
a { color: var(--brand-dark); }
.site-header {
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
    min-height: 72px; padding: 0 32px; background: var(--paper);
    border-bottom: 1px solid var(--line);
}
.brand { color: var(--ink); font-size: 1.25rem; font-weight: 800; text-decoration: none; }
.site-nav { display: flex; align-items: center; gap: 18px; }
.site-nav a { font-weight: 700; text-decoration: none; }
.page { width: min(100% - 40px, 960px); margin: 56px auto; }
.page-narrow { width: min(100% - 40px, 560px); }
h1 { margin: 0 0 14px; font-size: 2.25rem; letter-spacing: 0; }
h2 { margin: 36px 0 14px; font-size: 1.35rem; letter-spacing: 0; }
p { color: var(--muted); line-height: 1.6; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.button, button {
    display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
    padding: 0 18px; border: 1px solid var(--brand); border-radius: 6px;
    background: var(--brand); color: #fff; font: inherit; font-weight: 700;
    text-decoration: none; cursor: pointer;
}
.button-secondary { background: var(--paper); color: var(--brand-dark); }
form { margin-top: 28px; }
.field { margin-bottom: 18px; }
label { display: block; margin-bottom: 7px; font-weight: 700; }
input {
    width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid #aeb9b5;
    border-radius: 5px; background: var(--paper); color: var(--ink); font: inherit;
}
input:focus { outline: 3px solid rgba(8, 106, 87, .18); border-color: var(--brand); }
.code-input { max-width: 220px; font-size: 1.4rem; letter-spacing: 0; }
.message { margin: 20px 0; padding: 14px 16px; border-left: 4px solid var(--brand); background: var(--paper); color: var(--ink); }
.message-error { border-color: var(--danger); color: var(--danger); }
.course-row { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 20px 0; border-top: 1px solid var(--line); }
.course-row:last-child { border-bottom: 1px solid var(--line); }
.course-row h2 { margin: 0 0 7px; }
.course-row p { margin: 0; }
.price { color: var(--ink); font-size: 1.2rem; font-weight: 800; }
.account-line { color: var(--muted); }
.inline-form { display: inline; margin: 0; }
.link-button { min-height: auto; padding: 0; border: 0; background: none; color: var(--brand-dark); }
@media (max-width: 640px) {
    .site-header { padding: 14px 20px; align-items: flex-start; }
    .site-nav { align-items: flex-end; flex-direction: column; gap: 8px; }
    .page { margin-top: 38px; }
    .course-row { grid-template-columns: 1fr; }
}