:root{--ink:#17343b;--muted:#5f7478;--paper:#fbfaf6;--card:#fff;--orange:#ff805d;--mint:#cdeadd;--blue:#c9e7f4;--line:#dce7e4;--shadow:0 24px 70px rgba(23,52,59,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Tajawal",system-ui,sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}.course-shell{width:min(1160px,calc(100% - 40px));margin:auto}.course-nav{position:sticky;top:0;z-index:20;background:rgba(251,250,246,.9);backdrop-filter:blur(18px);border-bottom:1px solid rgba(23,52,59,.08)}.course-nav .course-shell{height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.course-brand{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:900;letter-spacing:-.04em}.course-brand 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