.course-page { background: #f6f8f6; }
.course-header-nav { display: flex; align-items: center; gap: 18px; color: var(--navy); font-size: .88rem; font-weight: 650; }
.course-header-nav > a:not(.button) { border-bottom: 1px solid transparent; padding: 4px 0; }
.course-header-nav > a:not(.button):hover, .course-header-nav > a:not(.button):focus-visible { border-color: var(--gold); }
.course-shell { display: grid; grid-template-columns: minmax(270px, 330px) minmax(0, 1fr); min-height: calc(100vh - 76px); }
.course-navigation { position: sticky; top: 76px; height: calc(100vh - 76px); overflow-y: auto; padding: 46px 32px 34px 0; border-right: 1px solid var(--line); }
.course-navigation__title h1 { margin-bottom: 14px; font-size: 2.35rem; }
.course-navigation__title > p:not(.eyebrow) { margin-bottom: 30px; color: var(--muted); font-size: .92rem; }
.workbook-download { display: inline-flex; gap: 8px; align-items: center; margin: -8px 0 26px; color: var(--green-dark); font-size: .85rem; font-weight: 740; }
.workbook-download span { color: var(--gold); font-size: 1.2rem; }
.course-menu { border-top: 1px solid var(--line); }
.course-module { padding: 17px 0; border-bottom: 1px solid var(--line); }
.course-module__label { display: flex; gap: 9px; margin: 0 0 12px; color: var(--navy); font-size: .86rem; font-weight: 770; line-height: 1.3; }
.course-module__label span { color: var(--gold); font-family: var(--serif); }
.course-module__lessons { display: grid; gap: 5px; }
.lesson-link { display: block; width: 100%; padding: 7px 8px; border: 0; border-left: 2px solid transparent; background: transparent; color: var(--muted); cursor: pointer; text-align: left; font: inherit; font-size: .82rem; line-height: 1.35; }
.lesson-link:hover, .lesson-link:focus-visible { background: #edf4ef; color: var(--green-dark); outline: none; }
.lesson-link.is-active { border-left-color: var(--green); background: #e7f1e9; color: var(--navy); font-weight: 700; }
.course-navigation__note { margin: 26px 0 0; color: var(--muted); font-size: .77rem; }
.lesson-content { min-width: 0; padding: 60px 0 90px clamp(34px, 7vw, 108px); }
.lesson-loading { color: var(--muted); }
.lesson-header { max-width: 820px; margin-bottom: 38px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.lesson-header__meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0 0 18px; color: var(--green); font-size: .8rem; font-weight: 760; letter-spacing: .04em; text-transform: uppercase; }
.lesson-header h2 { margin-bottom: 18px; font-size: clamp(2.35rem, 4vw, 4.2rem); }
.lesson-header__outcome { margin: 0; color: var(--muted); font-size: 1.08rem; }
.lesson-header__outcome strong { color: var(--navy); }
.step-list { display: grid; gap: 24px; max-width: 820px; }
.lesson-step { padding: 27px 28px; border: 1px solid var(--line); border-radius: 4px; background: #fffefb; }
.lesson-step__head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px; }
.lesson-step__number { color: var(--gold); font-family: var(--serif); font-size: 1.45rem; }
.lesson-step h3 { margin: 0; font-family: var(--serif); font-size: 1.42rem; font-weight: 400; }
.step-body { color: var(--ink); }.step-body p:last-child { margin-bottom: 0; }.step-body strong { color: var(--navy); }
.step-visual { width: 100%; margin: 8px 0 22px; border: 1px solid var(--line); background: #fff; }
.practice-label { display: inline-block; margin-bottom: 10px; padding: 4px 8px; background: var(--gold-pale); color: #7d550c; font-size: .76rem; font-weight: 760; letter-spacing: .05em; text-transform: uppercase; }
.quiz { display: grid; gap: 20px; }
.quiz-question { padding: 20px; border: 1px solid #d8e4db; background: #f4f8f5; }.quiz-question p { color: var(--navy); font-weight: 680; }
.quiz-options { display: grid; gap: 8px; }.quiz-option { width: 100%; padding: 10px 12px; border: 1px solid #c9d7cc; border-radius: 3px; background: #fff; color: var(--ink); cursor: pointer; text-align: left; font: inherit; }.quiz-option:hover, .quiz-option:focus-visible { border-color: var(--green); outline: 2px solid transparent; background: #edf6ef; }.quiz-option.is-correct { border-color: var(--green); background: #dff2e5; }.quiz-option.is-incorrect { border-color: #b2573b; background: #fae9e3; }
.quiz-result { min-height: 1.5em; margin: 11px 0 0; color: var(--muted); font-size: .91rem; }.quiz-result.is-correct { color: var(--green-dark); }.quiz-result.is-incorrect { color: #8c3d26; }
.lesson-navigation { display: flex; justify-content: space-between; gap: 16px; max-width: 820px; margin-top: 34px; padding-top: 26px; border-top: 1px solid var(--line); }.lesson-navigation button { max-width: 48%; border: 0; background: transparent; color: var(--green-dark); cursor: pointer; font: inherit; font-weight: 700; text-align: left; }.lesson-navigation button:last-child { text-align: right; }.lesson-navigation button:disabled { color: #98a6b6; cursor: default; }
.course-error { max-width: 760px; padding: 28px; border: 1px solid #dba68c; background: #fff7f3; color: #6d3323; }
@media (max-width: 880px) { .course-shell { grid-template-columns: 1fr; }.course-navigation { position: static; height: auto; overflow: visible; padding: 32px 0; border-right: 0; border-bottom: 1px solid var(--line); }.course-menu { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; }.course-module { break-inside: avoid; }.lesson-content { padding: 48px 0 72px; }.course-header-nav { display: flex; align-items: center; gap: 16px; font-size: .85rem; }.course-header-nav > a:not(.button) { display: none; } }
@media (max-width: 600px) { .course-header-nav .button { width: auto; min-height: 36px; padding: 7px 10px; font-size: .78rem; }.course-menu { grid-template-columns: 1fr; }.course-navigation { padding-top: 25px; }.course-navigation__title h1 { font-size: 2rem; }.lesson-content { padding-top: 34px; }.lesson-header h2 { font-size: 2.2rem; }.lesson-step { padding: 21px 18px; }.lesson-navigation { flex-direction: column; }.lesson-navigation button, .lesson-navigation button:last-child { max-width: 100%; text-align: left; } }