:root{--bg-color: #f4f8fb;--text-color: #222b45;--primary: #2075ee;--primary-light: #6c99f8;--primary-dark: #155dc5;--card-bg: #fff;--card-border: #d7e3ff;--shadow: 0 8px 32px rgba(44, 62, 80, .18)}.centered-heading{text-align:center;margin-bottom:1rem;color:var(--primary)}.dark{--bg-color: #1e1e1e;--text-color: #f5f5f5;--primary: #4f8cff;--primary-light: #7faaff;--primary-dark: #3466d6;--card-bg: #23272f;--card-border: #34495e;--shadow: 0 8px 32px rgba(20, 20, 40, .28)}*,*:before,*:after{box-sizing:border-box}body{background-color:var(--bg-color);color:var(--text-color);font-family:Arial,sans-serif;margin:0;padding:0;transition:background .3s,color .3s}.idea-card{border:1px solid var(--card-border);padding:1rem;border-radius:10px;margin:1rem 0;background-color:var(--card-bg);color:var(--text-color);box-shadow:var(--shadow);transition:background .3s,color .3s,border .3s}.navbar{min-height:70px;padding:1.5rem 2.5rem;background:linear-gradient(90deg,var(--primary-dark) 60%,var(--primary) 100%);color:#fff;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 8px #2c3e5014;border-bottom-left-radius:12px;border-bottom-right-radius:12px}.navbar-logo{color:#fff;text-decoration:none;font-size:1.3rem;letter-spacing:1px;transition:color .2s}.navbar-right a{color:#fff;text-decoration:none;margin-left:1.5rem;font-size:1.05rem;font-weight:500;padding-bottom:2px;border-bottom:2px solid transparent;transition:color .2s,border-bottom .2s}.navbar-right a.active,.navbar-right a:hover{color:var(--primary-light);border-bottom:2px solid var(--primary-light)}.navbar a,.navbar button{color:#fff;text-decoration:none;margin-left:1rem;background:none;border:none;font-size:1rem;cursor:pointer;transition:color .2s}.navbar a:hover,.navbar button:hover{color:var(--primary-light)}.idea-form{max-width:450px;margin:40px auto;padding:32px 28px;background:var(--card-bg);border-radius:12px;box-shadow:var(--shadow);font-family:Segoe UI,Arial,sans-serif;border:1px solid var(--card-border);transition:background .3s,color .3s,border .3s}.idea-form h2{margin-bottom:22px;color:var(--primary);text-align:center;font-size:2rem;letter-spacing:1px}.idea-form input,.idea-form textarea,.idea-form select{width:100%;padding:12px 14px;margin-bottom:16px;border:1px solid var(--card-border);border-radius:6px;background-color:#f7faff;transition:border-color .3s,box-shadow .3s,background .3s,color .3s;font-size:1rem;color:var(--text-color)}.idea-form input:focus,.idea-form textarea:focus,.idea-form select:focus{border-color:var(--primary);outline:none;box-shadow:0 0 4px var(--primary-light)}.dark .idea-form input,.dark .idea-form textarea,.dark .idea-form select{background-color:#23272f;color:var(--text-color)}.idea-form .form-actions{text-align:right}.idea-form button[type=submit]{background:linear-gradient(90deg,var(--primary) 60%,var(--primary-light) 100%);color:#fff;padding:12px 28px;border:none;border-radius:7px;cursor:pointer;font-size:1rem;font-weight:600;box-shadow:0 2px 8px #2c3e5014;transition:background .2s,transform .1s}.idea-form button[type=submit]:hover,.idea-form button[type=submit]:focus{background:linear-gradient(90deg,var(--primary-dark) 60%,var(--primary) 100%);transform:translateY(-2px) scale(1.03)}.dark-toggle{position:fixed;top:1rem;right:1rem;background:var(--card-bg);color:var(--primary);border:1px solid var(--card-border);border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow);transition:background .3s,color .3s,border .3s;z-index:1000}.dark .dark-toggle{background:var(--card-bg);color:var(--primary-light);border:1px solid var(--primary-dark)}body,.idea-card,.idea-form,.navbar{transition:background .3s,color .3s,border .3s,box-shadow .3s}h1,h2,h3,h4,h5,h6{font-size:28px!important}.card-actions{display:flex;gap:1rem;margin-top:1rem}.edit-btn{background:linear-gradient(90deg,var(--primary) 60%,var(--primary-light) 100%);color:#fff;border:none;border-radius:6px;padding:8px 20px;font-size:1rem;font-weight:500;cursor:pointer;transition:background .2s,transform .1s;box-shadow:0 2px 8px #2c3e5014}.edit-btn:hover,.edit-btn:focus{background:linear-gradient(90deg,var(--primary-dark) 60%,var(--primary) 100%);transform:translateY(-2px) scale(1.03)}.delete-btn{background:linear-gradient(90deg,#e74c3c 60%,#ff7675);color:#fff;border:none;border-radius:6px;padding:8px 20px;font-size:1rem;font-weight:500;cursor:pointer;transition:background .2s,transform .1s;box-shadow:0 2px 8px #2c3e5014}.delete-btn:hover,.delete-btn:focus{background:linear-gradient(90deg,#c0392b 60%,#e17055);transform:translateY(-2px) scale(1.03)}.favorite-btn{background:none;border:none;font-size:1.6rem;cursor:pointer;color:#bbb;transition:color .2s;margin-left:.5rem;padding:0}.favorite-btn.active{color:#27ae60}