:root {
    --primary: #00f2ff;
    --danger: #ff4757;
    --bg: #121212;
    --card: #1e1e1e;
    --text: #ffffff;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding-top: 80px;
}

.todo-app {
    background: var(--card);
    width: 380px;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

header h2 { margin: 0; font-size: 1.5rem; }
header p { color: #666; font-size: 0.9rem; margin: 5px 0 20px; }

.input-row { display: flex; gap: 10px; margin-bottom: 25px; }

input {
    flex: 1;
    background: #2d2d2d;
    border: 1px solid #444;
    padding: 12px 15px;
    color: white;
    border-radius: 10px;
    outline: none;
    transition: 0.3s;
}

input:focus { border-color: var(--primary); }

.add-btn {
    background: var(--primary);
    border: none;
    padding: 0 20px;
    border-radius: 10px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.add-btn:hover { transform: scale(1.05); filter: brightness(1.1); }

/* Task Items */
ul { list-style: none; padding: 0; }

.task-item {
    background: #2d2d2d;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: 0.2s;
    border-left: 4px solid transparent;
}

.task-item:hover { transform: translateX(5px); background: #333; }

.task-item.completed {
    opacity: 0.4;
    text-decoration: line-through;
    border-left-color: var(--primary);
}

.delete-btn {
    color: #666;
    font-size: 18px;
    transition: 0.2s;
}

.delete-btn:hover { color: var(--danger); }

.footer {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: #888;
}

.clear-btn {
    background: none;
    border: 1px solid #444;
    color: #888;
    padding: 5px 12px;
    border-radius: 6px;
    cursor: pointer;
}

.clear-btn:hover { color: white; border-color: white; }