:root{--ink:#13213c;--muted:#68748a;--blue:#175cd3;--blue-strong:#124aa8;--blue-soft:#eef5ff;--gold:#b88a35;--line:#dfe5ee;--surface:#fff;--canvas:#f6f7f4}*{box-sizing:border-box}html{background:var(--canvas);overflow-x:hidden}body{color:var(--ink);background:var(--canvas);font-family:var(--font-be-vietnam), Arial, sans-serif;-webkit-font-smoothing:antialiased;margin:0}button,textarea,input{font:inherit}button{-webkit-tap-highlight-color:transparent}:is(button:focus-visible,textarea:focus-visible){outline-offset:2px;outline:3px solid #175cd333}.app-shell{--topbar-height:68px;min-height:100svh;overflow-x:hidden}.app-shell.welcome-shell{height:100dvh;min-height:0;overflow:hidden}.app-shell.has-fixed-navigation{padding-top:calc(var(--topbar-height) + 2px)}.fixed-navigation{z-index:1000;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#fffffffa;border-top:1px solid #f0d8d8;position:fixed;inset:0 0 auto;box-shadow:0 3px 14px 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