:root{--ink:#14161a;--muted:#66707d;--line:#e7eaee;--paper:#f6f7f9;--sky:#4fc3f7;--blue:#216fe8;--blue-dark:#1554b8;--soft-blue:#e8f4ff;--white:#fff;--radius:22px;--shadow:0 24px 60px rgba(31,60,92,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--white);font-family:Noto Sans Thai,Leelawadee UI,Tahoma,system-ui,sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.container{width:min(1160px,calc(100% - 40px));margin-inline:auto}.narrow{width:min(760px,calc(100% - 40px));margin-inline:auto}.navbar{position:-webkit-sticky;position:sticky;top:0;z-index:50;border-bottom:1px solid 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