:root{--ivory:#f8f3e9;--paper:#fffdf8;--ink:#28231e;--soft-ink:#625b51;--brown:#806956;--line:#d9d0c2;--rose:#a77d76}*{box-sizing:border-box}html{background:var(--ivory);min-height:100%}body{min-width:320px;min-height:100vh;color:var(--ink);background:var(--ivory);margin:0;font-family:Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}.app-shell{max-width:720px;min-height:100vh;margin:0 auto;padding:24px 24px 106px}.site-header{color:var(--soft-ink);justify-content:space-between;align-items:center;display:flex}.brand{color:var(--ink);letter-spacing:-.04em;align-items:center;gap:9px;font-family:Georgia,Times New Roman,serif;font-size:1.45rem;display:inline-flex}.brand-mark{align-items:center;gap:4px;display:inline-flex}.brand-mark i{background:var(--ink);border-radius:50%;width:7px;height:7px;display:block}.header-note,.auth-link{color:var(--soft-ink);letter-spacing:.04em;font-size:.69rem}.auth-link{border-bottom:1px solid 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p{max-width:34ch;color:var(--soft-ink);margin:16px 0 0;font-family:Georgia,Times New Roman,serif;font-size:1.02rem;line-height:1.5}.opening-copy em{color:var(--ink)}.opening-screen .primary-action,.letter-reading-screen .primary-action{cursor:pointer}.opening-screen .primary-action:disabled{cursor:wait;opacity:.7}.opening-message{color:#8a4f48;max-width:36ch;margin:21px 0 0;font-family:Georgia,Times New Roman,serif;font-size:.94rem;line-height:1.5}.reading-paper{min-height:0}.reading-note{max-width:32ch;color:var(--soft-ink);margin:27px 0;font-family:Georgia,Times New Roman,serif;font-size:.96rem;line-height:1.5}.navigation{z-index:2;border-top:1px solid var(--line);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#f8f3e9f0;grid-template-columns:repeat(3,1fr);max-width:720px;margin:0 auto;display:grid;position:fixed;bottom:0;left:0;right:0}.nav-link{color:var(--soft-ink);flex-direction:column;align-items:center;gap:6px;padding:15px 8px 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