:root{--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";--line-height: 1.5;--font-weight: 400;--color-canvas-default: #0d1117;--color-canvas-subtle: #161b22;--color-border-default: #30363d;--color-border-muted: #21262d;--color-fg-default: #c9d1d9;--color-fg-muted: #8b949e;--color-accent-fg: #58a6ff;--color-success-fg: #238636;--color-success-hover: #2ea043;--color-danger-fg: #f85149;--color-danger-hover: #da3633;--color-btn-text: #ffffff;--color-btn-bg: #21262d;--color-btn-hover-bg: #30363d;--shadow-small: 0 1px 0 rgba(27, 31, 35, .04);--shadow-medium: 0 3px 6px rgba(140, 149, 159, .15);--shadow-large: 0 8px 24px rgba(140, 149, 159, .2);color-scheme:dark;color:var(--color-fg-default);background-color:var(--color-canvas-default);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;display:flex;place-items:center;justify-content:center;min-width:320px;min-height:100vh;background-color:var(--color-canvas-default);font-family:var(--font-family)}h1{font-size:2em;line-height:1.25;font-weight:600;color:var(--color-fg-default)}button{border-radius:6px;border:1px solid var(--color-border-default);padding:5px 16px;font-size:14px;font-weight:500;font-family:inherit;background-color:var(--color-btn-bg);color:var(--color-fg-default);cursor:pointer;transition:.2s cubic-bezier(.3,0,.5,1)}button:hover{background-color:var(--color-btn-hover-bg);border-color:#8b949e}button:focus,button:focus-visible{outline:2px solid var(--color-accent-fg);outline-offset:-2px}.todo-container{background-color:var(--color-canvas-default);border:1px solid var(--color-border-default);border-radius:6px;padding:32px;width:100%;max-width:480px;display:flex;flex-direction:column;gap:16px;box-shadow:var(--shadow-small)}.title{font-size:24px;font-weight:600;margin:0;color:var(--color-fg-default);background:none;-webkit-text-fill-color:initial;text-align:center;border-bottom:1px solid var(--color-border-muted);padding-bottom:16px}.input-group{display:flex;gap:8px;position:relative}.todo-input{flex:1;background-color:var(--color-canvas-default);border:1px solid var(--color-border-default);border-radius:6px;padding:5px 12px;color:var(--color-fg-default);font-size:14px;line-height:20px;font-family:inherit;transition:80ms cubic-bezier(.33,1,.68,1)}.todo-input:focus{outline:none;border-color:var(--color-accent-fg);box-shadow:0 0 0 3px #388bfd4d}.add-btn{background-color:var(--color-success-fg);color:#fff;border:1px solid rgba(27,31,35,.15);border-radius:6px;padding:5px 16px;font-weight:500;font-size:14px;line-height:20px;text-transform:none;letter-spacing:normal;box-shadow:var(--shadow-small)}.add-btn:hover{background-color:var(--color-success-hover);border-color:#1b1f2326;transform:none;box-shadow:var(--shadow-small)}.list-container{display:flex;flex-direction:column;border:1px solid var(--color-border-default);border-radius:6px;background:var(--color-canvas-subtle);overflow:hidden}.todo-item{display:flex;align-items:center;justify-content:space-between;background:var(--color-canvas-default);border-top:1px solid var(--color-border-muted);padding:8px 16px;transition:none;animation:none}.todo-item:first-child{border-top:none}.todo-item:hover{background:var(--color-canvas-subtle);transform:none;border-top-color:var(--color-border-muted)}.todo-text{font-size:14px;color:var(--color-fg-default)}.delete-btn{background:transparent;color:var(--color-danger-fg);padding:4px 8px;font-size:12px;border:1px solid transparent}.delete-btn:hover{background:var(--color-btn-hover-bg);color:var(--color-danger-hover);border-color:var(--color-border-default)}.app-layout{display:flex;flex-direction:column;min-height:100vh;width:100%}.main-content{flex:1;display:flex;justify-content:center;align-items:flex-start;padding:100px 20px 40px;background:var(--color-canvas-default)}.navbar{position:fixed;top:0;left:0;right:0;height:60px;display:flex;justify-content:space-between;align-items:center;padding:0 32px;background-color:#161b22;-webkit-backdrop-filter:none;backdrop-filter:none;border-bottom:1px solid var(--color-border-default);z-index:100;animation:none}.navbar-logo{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--color-fg-default)}.logo-text{background:none;-webkit-text-fill-color:initial;color:var(--color-fg-default)}.navbar-links{display:flex;gap:16px}.nav-link{color:var(--color-fg-default);text-decoration:none;font-weight:600;font-size:14px}.nav-link:hover{color:var(--color-fg-muted)}.footer{text-align:center;padding:40px 16px;color:var(--color-fg-muted);font-size:12px;border-top:1px solid var(--color-border-default);background:var(--color-canvas-default)}.highlight{color:var(--color-accent-fg);font-weight:400}.social-links{margin-top:20px;display:flex;justify-content:center;gap:24px}.social-link{color:var(--color-fg-muted);text-decoration:none;font-size:12px}.social-link:hover{color:var(--color-accent-fg);text-decoration:underline}