:root {
    --bg: #080808; --glass: rgba(20, 20, 20, 0.7); --border: rgba(255, 255, 255, 0.1);
    --text: #ffffff; --accent: #00f2ff; --gradient: linear-gradient(135deg, #00f2ff, #8a2be2);
}

body.light-theme {
    --bg: #f4f7f6; --glass: rgba(255, 255, 255, 0.8); --border: rgba(0, 0, 0, 0.05);
    --text: #1a1a1a; --accent: #5e17eb; --gradient: linear-gradient(135deg, #5e17eb, #ff007a);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg); color: var(--text); font-family: 'Space Grotesk', sans-serif; min-height: 100vh; transition: 0.4s; }

.glass-bg { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: radial-gradient(circle at 10% 20%, rgba(0, 242, 255, 0.05) 0%, transparent 40%); z-index: -1; }

.nav-back { position: absolute; top: 20px; left: 20px; text-decoration: none; color: var(--text); font-size: 0.8rem; opacity: 0.6; transition: 0.3s; z-index: 10; }
.nav-back:hover { opacity: 1; color: var(--accent); }

.dashboard { display: grid; grid-template-columns: 240px 1fr; gap: 20px; padding: 40px; height: 100vh; }

/* Sidebar */
.sidebar { background: var(--glass); backdrop-filter: blur(20px); border: 1px solid var(--border); border-radius: 30px; padding: 30px; display: flex; flex-direction: column; gap: 40px; }
.avatar { width: 50px; height: 50px; background: var(--gradient); border-radius: 15px; display: flex; align-items: center; justify-content: center; font-weight: bold; color: #000; }
.side-nav { display: flex; flex-direction: column; gap: 10px; }
.side-nav button { background: none; border: none; color: var(--text); text-align: left; padding: 12px; border-radius: 12px; cursor: pointer; transition: 0.3s; opacity: 0.6; }
.side-nav button.active, .side-nav button:hover { background: var(--border); opacity: 1; }

/* Content */
h1 { font-size: 2.5rem; letter-spacing: -1px; }
.gradient-text { 
    background: var(--gradient); 
    background-clip: text;
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
    color: transparent;
}
header p { color: #666; margin-top: 5px; }

.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 30px 0; }
.stat-card { background: var(--glass); border: 1px solid var(--border); padding: 25px; border-radius: 25px; }
.stat-card.accent { border-color: var(--accent); }
.stat-card .label { font-size: 0.8rem; text-transform: uppercase; color: #666; }

/* Tasks */
.tasks-section { background: var(--glass); border: 1px solid var(--border); border-radius: 30px; padding: 30px; height: 400px; overflow-y: auto; }
.input-group { display: flex; gap: 10px; margin-top: 20px; }
input { flex: 1; background: var(--bg); border: 1px solid var(--border); border-radius: 12px; color: var(--text); padding: 12px; font-family: inherit; }
#add-task-btn { background: var(--accent); color: #000; border: none; padding: 0 20px; border-radius: 12px; cursor: pointer; }

ul { list-style: none; margin-top: 20px; }
li { background: var(--border); padding: 15px; border-radius: 15px; margin-bottom: 10px; display: flex; justify-content: space-between; align-items: center; animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }