:root{--color-bg:#121212;--color-text:#ffffff;--color-divider:rgba(255,255,255,0.08);--color-accent:#aaa}[data-theme=light]{--color-bg:#ffffff;--color-text:#000000;--color-divider:rgba(0,0,0,0.1)}body{margin:0;color:var(--color-text);font-family:system-ui,sans-serif}.header,body{background-color:var(--color-bg)}.header{position:-webkit-sticky;position:sticky;top:0;z-index:999;border-bottom:1px solid var(--color-divider);transition:border-color .3s ease}.header__content{max-width:1200px;margin:0 auto;padding:.1rem 1rem;display:flex;justify-content:space-between;align-items:center}.header__title{font-size:1.225rem;font-weight:500;color:var(--color-text);margin-right:auto}.logo-icon{padding-top:0}.wellcome-text{font-weight:300;font-size:16px;font-family:Segoe UI,Helvetica Neue,sans-serif;letter-spacing:.5px}.author-name{font-family:Georgia,serif;font-style:italic;font-size:22px;line-height:1.2;font-weight:300;color:var(--color-accent)}.header__actions{margin-left:auto;display:flex;align-items:center;gap:.75rem}.theme-toggle-btn{display:flex;align-items:center;justify-content:center;width:80px;height:36px;border-radius:8px;background-color:transparent;border:1px solid var(--color-divider);color:var(--color-text);cursor:pointer}.theme-toggle-btn:hover{border-color:var(--color-accent);color:var(--color-text)}.github-link{color:var(--color-text);display:flex;align-items:center}.github-link:hover{border-color:var(--color-accent);color:var(--color-text)}.main-content{max-width:1200px;margin:2rem auto;padding:0 1rem}