:root{--bg-color:#f4f6f6;--text-color:#22312c;--text-muted:#6b7a74;--card-bg:#fff;--card-shadow:0 4px 6px #00000014;--primary-color:#0e7a5f;--primary-dark:#0a5c48;--accent-color:#b08a3c;--danger-color:#b04a3c;--line-color:#e3e8e6;--success-color:#27ae60}body.dark-mode{--bg-color:#121b18;--text-color:#e4ebe8;--text-muted:#93a39c;--card-bg:#1b2722;--card-shadow:0 4px 6px #00000059;--line-color:#2b3a34;--primary-color:#2eaf8d;--primary-dark:#208a6e}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);flex-direction:column;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;transition:background-color .3s,color .3s;display:flex}header{background-color:var(--card-bg);box-shadow:var(--card-shadow);z-index:50;justify-content:space-between;align-items:center;padding:.8rem 1.2rem;display:flex;position:sticky;top:0}.brand{color:var(--text-color);letter-spacing:-.01em;align-items:center;gap:.45rem;font-size:1.05rem;font-weight:800;text-decoration:none;display:flex}.brand i{color:var(--primary-color)}nav.main-nav{align-items:center;gap:.3rem;display:flex}nav.main-nav a{color:var(--text-muted);border-radius:999px;padding:.4rem .8rem;font-size:.9rem;font-weight:600;text-decoration:none;transition:color .2s,background .2s}nav.main-nav a:hover{color:var(--text-color)}nav.main-nav a.active{color:var(--primary-color);background:color-mix(in srgb, var(--primary-color) 12%, transparent)}.nav-actions{align-items:center;gap:.5rem;display:flex}.theme-toggle,.icon-btn,.hamburger-btn{color:var(--text-color);cursor:pointer;background:0 0;border:none;border-radius:50%;padding:.45rem;font-size:1.1rem;transition:transform 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