:root{--sakura:#F2A7B3;--sakura-strong:#E8899A;--sakura-light:#FBE4E8;--matcha:#7EC8A8;--matcha-strong:#5BB890;--matcha-light:#E3F5EC;--sora:#7DAED4;--sora-strong:#5C96C4;--sora-light:#E0EEF7;--yuzu:#F5D76E;--yuzu-strong:#E8C84A;--yuzu-light:#FDF6DC;--bg:#FAF7F2;--bg-surface:#FFFFFF;--bg-elevated:#FFFFFF;--text:#2D2B3D;--text-secondary:#5A576B;--text-muted:#9B97A8;--border-subtle:rgba(45,43,61,0.08);--border-light:rgba(45,43,61,0.12);--danger:#E86B6B;--danger-light:#FDE8E8;--success:var(--matcha);--success-light:var(--matcha-light);--shadow-xs:0 1px 3px rgba(45,43,61,0.04);--shadow-sm:0 2px 8px rgba(45,43,61,0.06);--shadow-md:0 4px 16px rgba(45,43,61,0.08);--shadow-lg:0 8px 32px rgba(45,43,61,0.10);--shadow-hover:0 8px 24px rgba(45,43,61,0.12);--radius:16px;--radius-sm:10px;--radius-xs:6px;--radius-full:999px;--ease-out:cubic-bezier(0.22,1,0.36,1);--ease-spring:cubic-bezier(0.34,1.56,0.64,1);--duration-fast:150ms;--duration-normal:250ms;--duration-slow:400ms;--auth-menu-height:72px}*{box-sizing:border-box}body{margin:0;background-color:var(--bg);color:var(--text);font-family:var(--font-body),"Noto Sans JP",sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:none}main{max-width:1000px;margin:0 auto;padding:24px}.auth-menu{position:-webkit-sticky;position:sticky;top:0;z-index:200;background:linear-gradient(120deg,rgba(255,255,255,.92),rgba(242,167,179,.08),rgba(125,174,212,.1));-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-subtle);box-shadow:0 8px 24px rgba(45,43,61,.06)}.auth-menu__inner{min-height:var(--auth-menu-height);max-width:1180px;margin:0 auto;padding:0 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.tweet-card__text{font-size:1.08rem;line-height:1.8}.thread-replies{background:rgba(250,247,242,.55)}.thread-empty{padding:24px;color:var(--text-muted);font-weight:700;text-align:center}h1,h2,h3,h4{font-family:var(--font-heading),"Fredoka",sans-serif;margin-top:0;color:var(--text);font-weight:600;line-height:1.3}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.2rem}h4{font-size:1.05rem}.card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:transform var(--duration-normal) var(--ease-out),box-shadow var(--duration-normal) var(--ease-out)}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}.card-static{background:var(--bg-surface);border:1px solid 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